### 10th Standard CBSE Science Study material & Free Online Practice Tests - View Model Question Papers with Solutions for Class 10 Session 2019 - 2020 CBSE [ Chapter , Marks , Book Back, Creative & Term Based Questions Papers - Syllabus, Study Materials, MCQ's Practice Tests etc..]

#### 10th Standard CBSE Science Board Exam Model Question paper III 2019-2020 - by Prerna - Bangalore - View & Read

• 1)

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved temperature?

• 2)

The pH of the gastric juices released during digestion is

• 3)

Which of the following metals are obtained by electrolysis of their chlorides in molten state?

(i) Na   (ii) Ca   (iii) Fe   (iv) Cu

• 4)

Carbohydrate in humans is stored in the form of

• 5)

Select the mis-matched pair.

#### 10th Standard CBSE Science Board Exam Model Question paper II 2019-2020 - by Prerna - Bangalore - View & Read

• 1)

Three beakers labelled as A, B and C each containing 25 mL of water was taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?
(i) In beakers A and B, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occured.

• 2)

Sodium hydrogen carbonate when added to acetic acid evolves a gas.  Which of the following statements are true about the gas evolved?

(i) It turns lime water milky

(ii) It extinguishes a burning splinter

(iii) It dissolves in a solution of sodium hydroxide

(iv) It has a pungent odour

• 3)

Which of the following non-metals is a liquid?

• 4)

Which part of alimentary canal receives bile from the liver?

• 5)

Which of the following is not associated with growth of plant?

#### 10th Standard CBSE Science Board Exam Model Question paper I 2019-2020 - by Prerna - Bangalore - View & Read

• 1)

The preparation of water from hydrogen and oxygen gas is accompanied by:

• 2)

Identify the correct representation of reaction occurring during chloralkali process

• 3)

Which of the following properly is generally not shown by metals?

• 4)

Which one of the following will decide whether something is alive:

• 5)

Junction between two neurons is called

#### 10th Standard CBSE Science Board Exam Model Question paper V 2020 - by Prerna - Bangalore - View & Read

• 1)

Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor(crystals)

• 2)

Calcium phosphate is present in tooth enamel.  Its nature is

• 3)

Generally, non-metals are not lustrous. Which of the following nonmetal is lustrous?

• 4)

Which of the first enzyme to mix with food in the digestive tract?

• 5)

The substance that triggers the fall of mature leaves and fruits from plants is due to

#### 10th Standard CBSE Science Board Exam Model Question paper IV 2020 - by Prerna - Bangalore - View & Read

• 1)

Which among the following is /are double displacement reaction(s) ?
(i) Pb + CuCl2 $\rightarrow$ PbCl2 + Cu
(ii) Na2SO4 + BaCl2 $\rightarrow$ BaSO4 + 2NaCl
(iii) C + O2 $\rightarrow$ CO2
(iv) CH4 + 2O2 $\rightarrow$ CO2 + 2H2O

• 2)

During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride.  The role of calcium chloride taken in the guard tube is to

• 3)

Generally, non-metals are not lustrous. Which of the following nonmetal is lustrous?

• 4)

The kidneys in human beings are a part of the system for

• 5)

Which of the following statement is correct about receptors?

#### 10th Standard CBSE Science Board Exam Model Question paper III 2020 - by Prerna - Bangalore - View & Read

• 1)

During an exothermic reaction

• 2)

Which of the following salts has no water of crystallization?

• 3)

If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of

• 4)

The kidneys in human beings are a part of the system for

• 5)

Which statement is not true about thyroxin?

#### 10th Standard CBSE Science Board Exam Model Question paper II 2020 - by Prerna - Bangalore - View & Read

• 1)

Three beakers labelled as A, B and C each containing 25 mL of water was taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?
(i) In beakers A and B, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occured.

• 2)

In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus shown below was set up.

which among the following statement(s) is (are) correct?
(i)Bulb will not glow because electrolyte is not acidic
(ii)Bulb will glow because NaOH is a strong base and furnishes ions for conduction.
(iii)Bulb will not glow because circuit is incomplete.
(iv)Bulb will not glow because it depends upon the type of electrolytic solution.

• 3)

2 ml each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occured in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be

• 4)

A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

• 5)

Which of the following statements about transmission of nerve impulse is incorrect?

#### 10th Standard CBSE Science Board Model Exam Question paper I 2020 - by Prerna - Bangalore - View & Read

• 1)

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?
(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
((iv) The pH of the resulting solution will be less than seven

• 2)

Which of the following is not a mineral acid?

• 3)

Which one of the following properties is not generally exhibited by ionic compounds?

• 4)

The correct sequence of anaerobic reactions in yeast is

• 5)

Involuntary actions in the body are controlled by

#### 10th Standard CBSE Science Public Model Question Paper V 2020 - by Prerna - Bangalore - View & Read

• 1)

Which information is not conveyed by a balanced chemical equation?

• 2)

The nature of calcium phosphate is present in tooth enamel is

• 3)

An alloy is

• 4)

The correct sequence of anaerobic reactions in yeast is

• 5)

Which of the following statements are true?
(i) Sudden action in response to something in the environment is called reflex action
(ii) Sensory neurons carry signals from spinal cord to muscles
(iii) Motor neurons carry signals from receptors to spinal cord
(iv) Impulse from a receptor to a muscle or a gland is called reflex arc

#### 10th Standard CBSE Science Public Model Question Paper IV 2020 - by Prerna - Bangalore - View & Read

• 1)

What is the role of a catalyst in a chemical

• 2)

Dry ammonia gas has no action on litmus paper, but a solution of a ammonia in water turns red litmus paper blue, why is it so?

• 3)

What is synapse?

• 4)

What are fossil fuels?

• 5)

Chlorine, bromine and iodine form a Dobereiner's triad. The atomic masses of chlorine and iodine are 35.5 and 126.9 respectively. Predict the atomic mass of bromine.

#### 10th Standard CBSE Science Public Model Question Paper III 2020 - by Prerna - Bangalore - View & Read

• 1)

The decomposition of vegetable matter in to compost is an example of what type of reaction?

• 2)

When acid rain flows into rivers the aquatic lives are affected. Why?

• 3)

What are gustatory receptors?

• 4)

A normal pea plant bearing coloured flowers suddenly start producing white flowers. What could be the possible cause?

• 5)

Name the type of particles which act as prism in the formation of rainbow in the sky

#### 10th Standard CBSE Science Public Model Question Paper II 2020 - by Prerna - Bangalore - View & Read

• 1)

Name the gas which burns with pop sound.

• 2)

(a) Give Arrhenius definition of an acid and a base.

(b) Choose strong acid and strong base from the following: $CH_3COOH,\ NH_4OH,\ KOH,\ HCl$

• 3)

Name the hormone secreted by thyroid gland.

• 4)

What is renewable source of energy?

• 5)

#### 10th Standard CBSE Science Public Model Question Paper I 2020 - by Prerna - Bangalore - View & Read

• 1)

Give an example of photochemical reactions.

• 2)

Why does tooth decay start when the pH of mouth is lower than 5.5?

• 3)

What is reflex action?

• 4)

What is meant by the 'calorific value' of a fuel? How is it determined? Arrange the following fuels in a decreasing order of their calorific values: Kerosene, Coal, LPG.

• 5)

Lithium, sodium and potassium form a Dobereiner's triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium.

#### 10th Standard CBSE Science Public Model Question Paper V 2019 - 2020 - by Prerna - Bangalore - View & Read

• 1)

Give the formula for quicklime.

• 2)

Fresh milk has a pH of 6. When it changes into curd (Yogurt), will its pH value increases or decreases? Why?

• 3)

What is synapse?

• 4)

What is meant by the 'calorific value' of a fuel? How is it determined? Arrange the following fuels in a decreasing order of their calorific values: Kerosene, Coal, LPG.

• 5)

Lithium, sodium and potassium form a Dobereiner's triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium.

#### 10th Standard CBSE Science Public Model Question Paper IV 2019 - 2020 - by Prerna - Bangalore - View & Read

• 1)

Name the different forms of energy required for breaking down the reactants in decomposition reaction.

• 2)

(a) Give Arrhenius definition of an acid and a base.

(b) Choose strong acid and strong base from the following: $CH_3COOH,\ NH_4OH,\ KOH,\ HCl$

• 3)

Name the hormone secreted by thyroid gland.

• 4)

What is meant by the 'calorific value' of a fuel? How is it determined? Arrange the following fuels in a decreasing order of their calorific values: Kerosene, Coal, LPG.

• 5)

Chlorine, bromine and iodine form a Dobereiner's triad. The atomic masses of chlorine and iodine are 35.5 and 126.9 respectively. Predict the atomic mass of bromine.

#### 10th Standard CBSE Science Public Model Question Paper III 2019 - 2020 - by Prerna - Bangalore - View & Read

• 1)

Name the different forms of energy required for breaking down the reactants in decomposition reaction.

• 2)

(a) Give Arrhenius definition of an acid and a base.

(b) Choose strong acid and strong base from the following: $CH_3COOH,\ NH_4OH,\ KOH,\ HCl$

• 3)

Name the hormone secreted by thyroid gland.

• 4)

What is meant by the 'calorific value' of a fuel? How is it determined? Arrange the following fuels in a decreasing order of their calorific values: Kerosene, Coal, LPG.

• 5)

Chlorine, bromine and iodine form a Dobereiner's triad. The atomic masses of chlorine and iodine are 35.5 and 126.9 respectively. Predict the atomic mass of bromine.

#### 10th Standard CBSE Science Public Model Question Paper II 2019 - 2020 - by Prerna - Bangalore - View & Read

• 1)

Which term is used to indicate the development of unpleasant smell and taste in butter and oil containing food?

• 2)

Fresh milk has a pH of 6. When it changes into curd (Yogurt), will its pH value increases or decreases? Why?

• 3)

Name the part of hind brain which takes part in regulation of respiration.

• 4)

What is geothermal energy?

• 5)

Lithium, sodium and potassium form a Dobereiner's triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium.

#### 10th Standard CBSE Science Public Model Question Paper I 2019 - 2020 - by Prerna - Bangalore - View & Read

• 1)

Arun took a pale green substance X in a test tube, and heated it over a flame. He observed a color change along with evolution of two gases with the smell of burning sulphur
(a) Identify X. (b) Identify the product formed. (c) Write the equation.
(d) Identify the type of chemical reaction.

• 2)

When acid rain flows into rivers the aquatic lives are affected. Why?

• 3)

Name one endocrine gland which performs dual function.

• 4)

Which one of the following is a renewable resource?
Natural gas, Petrroleum, Ground water, Coal

• 5)

State modern periodic law of classification of elements.

#### CBSE 10th Science - Acids, Bases and Salts Model Question Paper - by Prerna - Bangalore - View & Read

• 1)

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky.  The solution contains.

• 2)

During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride.  The role of calcium chloride taken in the guard tube is to

• 3)

Sodium carbonate is a basic salt because it is a salt of

• 4)

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

• 5)

Lime water is

#### CBSE 10th Science - Chemical Reactions and Equations Model Question Paper - by Prerna - Bangalore - View & Read

• 1)

Which of the following statements about the reaction below are incorrect?
2PbO(s) + C(s) $\rightarrow$ 2Pb(s) + CO2(s)
(a) Lead is getting reduced        (b) Carbon dioxide is getting oxidized
(c) Carbon is getting oxidized     (d) Lead oxide is getting reduced.

• 2)

Which of the following statements about the given reaction are correct?
3Fe(s) + 4H2O(g) $\rightarrow$ Fe3O4(s) + 4H2(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent

• 3)

Three beakers labelled as A, B and C each containing 25 mL of water was taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?
(i) In beakers A and B, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occured.

• 4)

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?
(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
((iv) The pH of the resulting solution will be less than seven

• 5)

Chemically rust is

#### CBSE 10th Science - Full Syllabus One Mark Question Paper with Answer Key - by Prerna - Bangalore - View & Read

• 1)

Which of the following statements about the given reaction are correct?
3Fe(s) + 4H2O(g) $\rightarrow$ Fe3O4(s) + 4H2(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent

• 2)

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

• 3)

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

• 4)

If reaction between nitrogen and hydrogen to form ammonia is exothermic, then it will be accompanied by

• 5)

Which of the following feature is common to both physical and chemical change?

#### CBSE 10th Science - Full Syllabus Five Marks Questions - by Prerna - Bangalore - View & Read

• 1)

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed.
(a) Write a balanced chemical equation of the reaction.
(b) Identify the brown gas X evolved.
(c) Identify the type of reaction.
(d) What could be the pH range of aqueous solution of the gas X?

• 2)

For making cake, baking powder is taken.  If at home your mother uses baking soda instead of baking powder in cake,

(a) How will it affect the taste of the cake and why?

(b) How can baking soda be converted into baking powder?

(c) What is the role of tartaric acid added to baking soda?

• 3)

Explain the following
(a) Reactivity of Al decreases if it is dipped in HNO3.
(b) Carbon cannot reduce the oxides of Na or Mg
(c) NaCl is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state.
(d) Iron articles are galvanised
(e) Metals like Na, K, Ca and Mg are never found in their free state in nature.

• 4)

Explain the mechanism of photosymthesis.

• 5)

How does chemical coordination take place in animals?

#### CBSE 10th Science - Full Syllabus Three Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Define a chemical reaction. Which observation help you to determine whether a chemical reaction has taken place?

• 2)

Define the term decomposition reaction. Give one example each of thermal decomposition and electrolytic decomposition.

• 3)

Write the chemical equation of the reaction with an example each in which the following change has taken place:
(i) Change in colour
(ii)Change in temperature
(iii) Formation of precipitate.

• 4)

A sanitary worker uses a white chemical having strong smell of chlorine gas to disinfect the water tank.
(i) Identify the chemical compound, write its chemical formula.
(ii) Give chemical equation for its preparation.
(iii) Write its two uses other than disinfection.

• 5)

Explain the action of dilute hydrochloric acid on the following with chemical equation:
(i) magnesium ribbon
(ii) sodium hydroxide
(iii) crushed egg shells

#### CBSE 10th Science - Full Syllabus Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Why should a magnesium ribbon be cleaned before burning in air?

• 2)

Balance the following chemical equations.
(a) HNO3 + Ca(OH)2 $\rightarrow$ Ca(NO3)2 + H2O
(b) NaOH + H2SO4 $\rightarrow$ Na2SO4 + H2O
(c) NaCl + AgNO3 $\rightarrow$ AgCl + NaNO3
(d) BaCl2 + H2SO4 $\rightarrow$ BaSO4 + HCl

• 3)

A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction.

• 4)

Explain and name the type of reaction seen when iron reacts with hydrochloric acid.

• 5)

When Hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Write the balanced chemical equation with physical states for this reaction. State what kind of chemical reaction is this?

#### s1 - by Mrs. Parveen - View & Read

• 1)

Deoxygenated blood enters the heart through

• 2)

Complete digestion of carbohydrates, proteins and fats takes place in

• 3)

Tiny pores present on the surface of the leaf are called

• 4)

From the list given below pick the item that is not a natural resource

• 5)

Given below are a few statements related to biodiversity. Pick those that correctly describe the concept of biodiversity
(i) Biodiversity refers to the different species of flora and fauna present in an area
(ii) Biodiversity refers to only the flora of a given area
(iii) Biodiversity is greater in a forest
(iv) Biodiversity refers to the total number of individuals of a particular species living in an area

#### 10th CBSE Science - Our Environment Five Marks Model Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

Indicate the flow of energy in an ecosystem. Why is it unidirectional? Justify.

• 2)

What are decomposers? What will be the consequence of their absence in an ecosystem?

• 3)

Suggest any four activities in daily life which are eco-friendly.

• 4)

Give two differences between food chain and food web.

• 5)

Name the wastes which are generated in your house daily. What measures would you take for their disposal?

#### CBSE 10th Standard Science - Management of Natural Resources Five Marks Model Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

In the context of conservation of natural resources, explain the terms reduce, recycle and reuse. From among the materials that we use in daily life, identify two materials for each category.

• 2)

Prepare a list of five activities that you perform daily in which natural resources can be conserved or energy utilisation can be minimised.

• 3)

Is water conservation necessary? Give reasons.

• 4)

Suggest a few useful ways of utilising waste water.

• 5)

What is the importance of forest as a resource?

#### 10th CBSE Science - Light Reflection and Refraction Five Marks Model Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

Write laws of refraction. Explain the same with the help of ray diagram, when a ray of light passes through a rectangular glass slab.

• 2)

Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and another of - 50 cm. What is the nature of the lens and its power used by each of them?

• 3)

(i) One half of a convex lens of focal length 10 cm is convered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw ray diagram to justify your answer.
(ii) A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find nature, position and size of the image.

• 4)

(a) Define focal length of a spherical lens.
(b) A divergent lens has a focal length of 30 cm. At what distance should an object of height 5 cm from the optical centre of the lens be placed so that its image is formed 15 cm away from the lens? Find the size of the image also.
(c) Draw a ray diagram to show the formation of image in the above situation.

• 5)

(a) Define optical centre of a spherical lens.
(b) A divergent lens has a focal length of 20 cm At what distance should an object of height 4 cm from the optical centre of the lens be placed so that its image is formed 10 cm away from the lens. Find the size of the image also.
(c) Draw a ray diagram to show the formation of image in above situation.

#### CBSE 10th Standard Science - Heredity and Evolution Five Marks Model Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation.

• 2)

Differentiate between inherited and acquired characters. Give one example for each type.

• 3)

Give reasons why acquired characters are not inherited.

• 4)

In the following crosses write the characteristics of the progeny

 Cross Progeny (a) RR YY $\times$ RR YY ................... Round, yellow Round yellow ................... (b) Rr Yy $\times$ Re Yy ................... Round, yellow Round, ................... (c) rr yy $\times$ rr yy ................... Wrinkled, green wrinkled, green ................... (d) RR YY $\times$ rr yy ................... Round, yellow wrinkled green ...................
• 5)

Study the following cross and showing self-pollination in F1, fill in the blank answer the question that follows $\underset { Round,yellow }{ RRYY } \times \underset { Wrinkled,green }{ rryy } F1-\underset { Round,yellow }{ Rr\quad Yy\times }$

#### 10th CBSE Science - How do Organisms Reproduce Five Marks Model Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

Write two points of difference between asexual and sexual types of reproduction.Describe why variations are observed in the offspring formed by sexual reproduction.

• 2)

Distinguish between a gamete and zygote.Explain their roles in sexual reproduction.

• 3)

How does fertilisation take place? Fertilisation occurs once in a month.Comment.

• 4)

What is the placenta? Mention its role during pregnancy?

• 5)

Reproduction is essentially a phenomenon that is not survival of an individual but for the stability of a species.Justify.

#### 10th Standard CBSE Science - Periodic Classification of Elements Five Mark Model Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

An element is placed in 2nd Group and 3rd Period of the Periodic Table, burns in presence of oxygen to form a basic oxide.
(a) Identify the element.
(b) Write the electronic configuration.
(c) Write the balanced equation when it burns in the presence of air.
(d) Write a balanced equation when this oxide is dissolved in water.
(e) Draw the electron dot structure for the formation of this oxide.

• 2)

Atomic number of a few elements are given below 10, 20, 7, 14
(a) Identify the elements.
(b) Identify the Group number of these elements in the Periodic Table.
(c) Identify the Periods of these elements in the Periodic Table.
(d) What would be the electronic configuration for each of these elements?
(e) Determine the valency of these elements.

• 3)

(a) Electropositive nature of the element(s) increases down the group and decreases across the period
(b) Electronegativity of the element decreases down the group and increases across the period
(c) Atomic size increases down the group and decreases across a period (left to right)
(d) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.
(a) Name the most electropositive element among them.
(b) name the most electronegative element.
(c) Name the element with smallest atomic size.
(d) Name the element which shows maximum valency.

• 4)

An element A which is a yellow solid at room temperature shows catenation and allotropy. A forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.
(a) Identify the element A
(b) Write the electronic configuration of A
(c) Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?
(d) What would be the nature (acidic/ basic ) of oxides formed?
(e) Locate the Position of the element in the Modern Periodic Table.

• 5)

An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell.
(a) Identify the element X. How many valence electrons does it have?
(b) Draw the electron dot structure of the diatomic molecule of X. What type of bond is formed in it?
(c) Draw the electron dot structure for ammonia and what type of bond is formed in it?

#### 10th CBSE Science - Carbon and Its Compounds Five Mark Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

A salt X is formed and a gas is evolved when ethanoic acid reacts with sodium hydrogen carbonate. Name the salt X and the gas evolved. Describe an activity and draw the diagram of the apparatus to prove that the evolved gas is the one which you have named. Also, write chemical equation of the reaction involved.

• 2)

a) What are hydrocarbons? Give examples
b) Give the structural differences between saturated and unsaturated hydrocarbons with two example each.
c) What is a functional group? Give example of four different functional groups.

• 3)

Name the reaction which is commonly used in the conversion of vegetable oils to fats. Explain the reaction involved in detail.

• 4)

Esters are sweet-smelling substances and are used in making perfumes. Suggest some activity and the reaction involved for the preparation of an ester with well labeled diagram.

• 5)

How would you bring about the following conversions? Name the process and write the reaction involved.
a) Ethanol to ethene.
b) Propanol to propanoic acid

#### CBSE 10th Science -Life Process Five Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Describe the alimentary canal of man.

• 2)

Explain the process of breathing in man.

• 3)

Explain the important of soil for plant growth.

• 4)

How do carbohydrates, proteins and fats get digested in human beings?

• 5)

Explain the mechanism of photosymthesis.

#### CBSE 10th Science - Carbon and Its Compounds Five Marks Questions - by Prerna - Bangalore - View & Read

• 1)

A salt X is formed and a gas is evolved when ethanoic acid reacts with sodium hydrogen carbonate. Name the salt X and the gas evolved. Describe an activity and draw the diagram of the apparatus to prove that the evolved gas is the one which you have named. Also, write chemical equation of the reaction involved.

• 2)

a) What are hydrocarbons? Give examples
b) Give the structural differences between saturated and unsaturated hydrocarbons with two example each.
c) What is a functional group? Give example of four different functional groups.

• 3)

Name the reaction which is commonly used in the conversion of vegetable oils to fats. Explain the reaction involved in detail.

• 4)

a) Write the formula and draw electron dot structure of carbon tetrachloride?
b) What is saponification? Write the reaction involved in this process.

• 5)

Esters are sweet-smelling substances and are used in making perfumes. Suggest some activity and the reaction involved for the preparation of an ester with well labeled diagram.

#### CBSE 10th Science - Periodic Classification of Elements Five Marks Questions - by Prerna - Bangalore - View & Read

• 1)

An element is placed in 2nd Group and 3rd Period of the Periodic Table, burns in presence of oxygen to form a basic oxide.
(a) Identify the element.
(b) Write the electronic configuration.
(c) Write the balanced equation when it burns in the presence of air.
(d) Write a balanced equation when this oxide is dissolved in water.
(e) Draw the electron dot structure for the formation of this oxide.

• 2)

Atomic number of a few elements are given below 10, 20, 7, 14
(a) Identify the elements.
(b) Identify the Group number of these elements in the Periodic Table.
(c) Identify the Periods of these elements in the Periodic Table.
(d) What would be the electronic configuration for each of these elements?
(e) Determine the valency of these elements.

• 3)

Mendeleev' predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
(a) Name the elements which have taken the place of these elements.
(b) Mention the group and the period of these elements in the Modern Periodic Table.
(c) Classify these elements as metals, non-metals or metalloid.
(d) How many valence electrons are present in each one of them?

• 4)

(a) Electropositive nature of the element(s) increases down the group and decreases across the period
(b) Electronegativity of the element decreases down the group and increases across the period
(c) Atomic size increases down the group and decreases across a period (left to right)
(d) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.
(a) Name the most electropositive element among them.
(b) name the most electronegative element.
(c) Name the element with smallest atomic size.
(d) Name the element which shows maximum valency.

• 5)

An element A which is a yellow solid at room temperature shows catenation and allotropy. A forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.
(a) Identify the element A
(b) Write the electronic configuration of A
(c) Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?
(d) What would be the nature (acidic/ basic ) of oxides formed?
(e) Locate the Position of the element in the Modern Periodic Table.

#### 10th Standard CBSE Science - Heredity and Evolution Five Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation.

• 2)

Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria? Provide a suitable explanation.

• 3)

All the human races like Africans, Asians, Europeans, Americans and others might have evolved from a common ancestor. Provide a few evidences in support of this view.

• 4)

Differentiate between inherited and acquired characters. Give one example for each type.

• 5)

Give reasons why acquired characters are not inherited.

#### 10th Standard CBSE Science - Our Environment Five Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Indicate the flow of energy in an ecosystem. Why is it unidirectional? Justify.

• 2)

What are decomposers? What will be the consequence of their absence in an ecosystem?

• 3)

Suggest any four activities in daily life which are eco-friendly.

• 4)

Give two differences between food chain and food web.

• 5)

Name the wastes which are generated in your house daily. What measures would you take for their disposal?

#### 10th Standard CBSE Science - Light Reflection and Refraction Five Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3 rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?

• 2)

The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 cm and the lens?

• 3)

(i) One half of a convex lens of focal length 10 cm is convered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw ray diagram to justify your answer.
(ii) A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find nature, position and size of the image.

• 4)

(a) Define focal length of a spherical lens.
(b) A divergent lens has a focal length of 30 cm. At what distance should an object of height 5 cm from the optical centre of the lens be placed so that its image is formed 15 cm away from the lens? Find the size of the image also.
(c) Draw a ray diagram to show the formation of image in the above situation.

• 5)

(a) Define optical centre of a spherical lens.
(b) A divergent lens has a focal length of 20 cm At what distance should an object of height 4 cm from the optical centre of the lens be placed so that its image is formed 10 cm away from the lens. Find the size of the image also.
(c) Draw a ray diagram to show the formation of image in above situation.

#### 10th Standard CBSE Science - How do Organisms Reproduce Five Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Write two points of difference between asexual and sexual types of reproduction.Describe why variations are observed in the offspring formed by sexual reproduction.

• 2)

Distinguish between a gamete and zygote.Explain their roles in sexual reproduction.

• 3)

What are various ways to avoid pregnancy?Elaborate any one method.

• 4)

How does fertilisation take place? Fertilisation occurs once in a month.Comment.

• 5)

What is the placenta? Mention its role during pregnancy?

#### 10th Standard CBSE Science - Metals and Non-Metals Five Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.

• 2)

Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2 .What steps will you take to convert them into metals?

• 3)

What is an alloy? How is an alloy made? List two purpose of making alloys. Mention the constituents and two properties of each of the following alloys.
(i) Stainless steel
(ii) Brass

• 4)

(i) Why Sulphuric acid is called the 'king of chemicals'?
(ii) Name the gas evolved when :
(a) Concentrated Sulphuric acid acts on Sulphur.
(b) Dilute Sulphuric acid acts on Sodium carbonate.
(iii) State the colour change you would observe on adding concentrated sulphuric acid to :
(a) Blue Copper sulphate crystals.
(b) Colourless cane-sugar crystals.

• 5)

(a) Write chemical equations for the reactions involved in obtaining pure alumina from the mineral bauxite which has impurities of iron oxide and silica.
(b) Draw a labelled diagram of the electrolytic tank cell used for the extraction of aluminium from alumina.

#### 10th CBSE Science - Sources of Energy Five Mark Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

(a) What is a 'solar cell'?
(b) Why is biogas considered an ideal fuel for domestic use?
(c) Name a device in which controlled chain reaction is used.

• 2)

(a) Why is the Solar Cooker box covered with a plane glass plate?
(b) Why is energy of water flowering in a river considered to be an indirect form of solar energy?
(c) How is the fission of nucleus brought about?

• 3)

(a) State one limitation of solar energy available from solar cells.
(b) What is the minimum wind velocity required to obtain useful energy with a windmill?
(c) Define the term 'nuclear fission'.

• 4)

Which is the process used to harness nuclear energy these days? Explain it briefly.

• 5)

a) How can solar energy be harnessed?
b) Mention any two limitations in using solar energy.
c) How are these limitations overcome?

#### 10th CBSE Science - Magnetic Effects of Electric Current Five Mark Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

(a) Give two uses of electromagnets.
(b) Name any two devices which use permanent magnets.

• 2)

Distinguish between an electric motor and generator?

• 3)

(a) Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet get deflected when a bar magnet or a current carrying loop is brought near it.
(b) Describe some salient features of magnetic lines of field.

• 4)

With the help of a labelled circuit diagram illustrate the pattern of field lines of the magnetic field around a current carrying straight long conducting wire. How is the right hand thumb rule useful to find direction of magnetic field associated with a current carrying conductor?

• 5)

Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current carrying coil has 'n' turns the field produced at any point is n times as large as that produced by a single turn?

#### 10th Standard CBSE Science - Control and Coordination Five Mark Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

Draw a diagram showing endocrine glands in a male body. Label the following glands on it:
(i) Pituitary
(ii) Thyroid
(iv) Testes

• 2)

What are hormones? State one function of each of the following hormone
(i) Thyroxin
(ii) Insulin.

• 3)

Distinguish between voluntary and involuntary actions of our body.

• 4)

What constitutes the central and peripheral nervous systems? How are the components of central nervous system protected?

• 5)

Name various plant hormones. Also give their physiological effects on plant growth and development.

#### 10th Standard CBSE Science - Electricity Five Mark Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

(a) State Ohm's Law.
(b) Draw a schematic diagram of the circuit for studying Ohm's Law.

• 2)

If a 12 V battery is connected to the arrangement of resistances given below, calculate
(i) the total effective resistance of the arrangement and
(ii) the total current flowing in the circuit

• 3)

Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit, another set of three bulbs of the same voltage are connected in parallel to the same source.
(a) Will the bulb in the two circuits glow with the same brightness? Justify your answer.
(b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason

• 4)

State Ohm's law? How can it be verified experimentally? Does it hold good under all conditions? Comment

• 5)

How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistances in series connected to a battery?

#### 10th CBSE Science - Life Process Five Mark Question Paper Five Mark Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

Describe the alimentary canal of man.

• 2)

Explain the important of soil for plant growth.

• 3)

Explain the mechanism of photosymthesis.

• 4)

Describe the process of urine formation in kidneys.

• 5)

Explain the process of 'photosynthesis' in plants.List four factors which influence this process and describe how each of them affects the rate of the photosynthesis process.

#### 10th CBSE Science - Metals and Non-Metals Five Mark Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

A non-metal A which is the largest costituent of air, when heated with H2 in 1 : 3 ratio in the presence of catalyst (Fe) gives a gas B. On heating with O2 it gives an oxide C. If this oxide is passed into water in the presence of air it gives an acid D which acts as a strong oxidising agent.
(a) Identify A, B, C and D
(b) To which group of periodic table does this non - metal belong?

• 2)

Of the three metals X, Y and Z, X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity.

• 3)

An element A burns with golden flame in air. It reacts with another element B, atomic number 17 to give a product C. An aqueous solution of product C on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C and D. Also write down the equations for the reactions involved.

• 4)

Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2 .What steps will you take to convert them into metals?

• 5)

(a) Write chemical equations for the reactions involved in obtaining pure alumina from the mineral bauxite which has impurities of iron oxide and silica.
(b) Draw a labelled diagram of the electrolytic tank cell used for the extraction of aluminium from alumina.

#### 10th CBSE Science - Acids, Bases and Salts Five Mark Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

(i) Name the raw materials used in the manufacture of sodium carbonate by Solvay process.

(ii) How is the sodium hydrogen carbonate formed during Solvay process separated from a mixture of $NH_4Cl$ and $NaHCO_3$?

(iii) How is sodium carbonate obtained from sodium hydrogen carbonate?

• 2)

(i) An aqueous solution has a pH value of 7.0.  Is this solution acidic, basic or neutral?

(ii) If H+ concentration of a solution is $1\times 10^{-2}\ mol\ L^{-1},$ what is the pH value for it?

(iii) Which has a higher pH value, 1 M HCl or 1 M NaOH solution?

• 3)

In the following schematic diagram for the preparation of hydrogen gas as shown in Figure, what would happen if following changes are made?

(a) In place of zinc granules, same amount of zinc dust is taken in the test tube.
(b) Instead of dilute sulphuric acid, dilute hydrochloric acid is taken.
(c) In place of zinc, copper turnings are taken.
(d) Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.

• 4)

A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back.  On the other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y; it gives a compound Z, used for disinfecting drinking water.  Identity X, Y, G and Z.

• 5)

A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance.  Which can be moulded into different shapes by making its dough.  When this compound is left in open for sometime, it becomes a solid mass and cannot be used for moulding purposes.  Identify the sulphate salt and why does it show such a behaviour?  Give the reaction involved.

#### 10th CBSE Science - Chemical Reactions and Equations Five Mark Question Paper - by Nargis Rajkumar - Panchkula - View & Read

• 1)

Name a reducing agent that may be used to obtain manganese from manganese dioxide.

• 2)

Balance the following chemical equation:
MnO2 + HCl $\rightarrow$ MnCl2 + Cl2 + H2O

• 3)

Define a chemical reaction. Which observation help you to determine whether a chemical reaction has taken place?

• 4)

Write the steps for balancing the chemical equation for the formation of ammonia by the combination of nitrogen and hydrogen.

• 5)

2 g ferrous sulphate crystals are heated in a dry boiling tube.
(i) List any two observations.
(ii) Name the type of chemical reaction taking place.
(iii) Write the chemical equation of the reaction.

#### CBSE 10th Science - Metals and Non-Metals Three Marks Questions - by Prerna - Bangalore - View & Read

• 1)

On adding dilute HCI acid to copper oxide powder, the solution formed is blue-green. Predict the new compound formed which imparts a blue-green colour to the solution.

• 2)

Name a major ore from which iron is extracted. Write chemical equations for the reactions that take place in the blast furnace for the extraction of iron from this ore.

• 3)

(i) Name an important oxide ore of iron.
(ii) Describe the extraction of iron from those ore under the following heads:
(a) Reduction of the concentrated ore
(b) Diagram of the furnace used
(c) Chemical equations for the reactions involved

• 4)

Give reasons for the following :
(i) Metals are regarded as electro-positive elements
(ii) When a piece of copper metal is added to a solution of zinc sulphate, no change takes place, but the blue colour of copper sulphate fades away when a piece of zinc is placed in its solution.
(iii) Articles made of alimunium do not corrode even though aluminium is an active metal.

• 5)

From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal.
(i) which reacts with water only on boiling and
(ii) another which does not react even with steam.

#### 10th Standard CBSE Science - Acids, Bases and Salts Three Marks Questions - by Prerna - Bangalore - View & Read

• 1)

What is 'Plaster of Paris' chemically?  How is it obtained from gypsum?  Write the condition and chemical equation involved in its manufacture.

• 2)

(a) Write the chemical name and formula of bleaching powder.

(b) Why does bleaching powder smell of chlorine when exposed to air?

(c) Write chemical equation to represent the action of dilute hydrochloric acid on bleaching powder

• 3)

(i) Name the raw materials used in the manufacture of sodium carbonate by Solvay process.

(ii) How is the sodium hydrogen carbonate formed during Solvay process separated from a mixture of $NH_4Cl$ and $NaHCO_3$?

(iii) How is sodium carbonate obtained from sodium hydrogen carbonate?

• 4)

(a) What is the action on litmus of:

(i) Dry ammonia gas

(ii) Solution of ammonia gas in water

(b) State the observations you would make on adding ammonium hydroxide to aqueous solutions of:

• 5)

What are the uses of washing soda?

#### CBSE 10th Science - Chemical Reactions and Equations Three Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Define a chemical reaction. Which observation help you to determine whether a chemical reaction has taken place?

• 2)

Define the term decomposition reaction. Give one example each of thermal decomposition and electrolytic decomposition.

• 3)

Write the steps for balancing the chemical equation for the formation of ammonia by the combination of nitrogen and hydrogen.

• 4)

(a) Mention the four informations given by an equation.
(b) State the law of conservation of mass as applicable in a chemical reaction.

• 5)

When a copper wire was left in silver nitrate solution for sometime, it was observed that the solution turned bluish green.
(i) Explain the observation.
(ii) Write the balanced chemical equation to represent the change taking place.

#### 10th Standard CBSE Science - Management of Natural Resources Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

What changes can you make in your habits to become more environment friendly?

• 2)

What would be the advantages of exploiting resources with short-term aims?

• 3)

Suggest some approaches towards the conservation of forests.

• 4)

• 5)

What changes would you suggest in your home in order to be environment-friendly?

#### 10th Standard CBSE Science - Our Environment Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

What are the problems caused by the non-biodegradable wastes that we generate?

• 2)

If all the waste we generate is biodegradable, will this have no impact on the environment?

• 3)

Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?

• 4)

We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?

• 5)

Why energy of herbivores never come back to the autotrophs?

#### 10th Standard CBSE Science - The Human Eye and the Colourful World Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

A person has normal vision, but he cannot distinguish between red-green colour.Why?

• 2)

Mention few important features of visual system of a person?

• 3)

Draw ray diagram each showing (i)myopic eye and  (ii) hypermetropic eye.

• 4)

Why do we see a rainbow in the sky only after rainfall?

• 5)

Why is the colour of the clear sky blue?

#### CBSE 10th Science - Light Reflection and Refraction Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Define the principle focus of a concave mirror

• 2)

Why do we prefer a convex mirror as a rear view mirror in vehicles?

• 3)

Find the focal length of a convex mirror whose radius of curvature is 32cm.

• 4)

The refractive index of diamond is 2.42.What is the meaning of this statement?

• 5)

Define 1 dioptre of power of a lens.

#### 10th Standard CBSE Science - Heredity and Evolution Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?

• 2)

How is the equal genetic contribution of male and female parents ensured in the progeny?

• 3)

Mala is four-month pregnant and is worried whether the child is male or female. One day she reads an advertisement regarding a medicine which of taken for 3 months results in birth of male child. What should she do?
(a) Get the medicine and take it regularly.
(b) Visit a doctor and discuss the problem with him/her.
(c) What, in your opinion, are the chances of having a male child?

• 4)

After reading about mendel's experiment on sweat pea Kala wanted to repeat the same in his kitchen garden. She bought sweet pea seeds and sowed them. After few months when the plants started flowering she observed that all the plants were tall.
(a) Why all plants were tall?
(b) Under which condition she could have observed both tall and dwarf plants?
(c) If she collects seeds from her garden and sows them, what type of plants she is expected to get?

• 5)

A new born has an XX pair of chromosomes. What is the sex of the new born baby?

#### 10th Standard CBSE Science - How do Organisms Reproduce Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

How does the eembryo get nourishment inside the mother's body?

• 2)

If a woman is using a copper-T, will it help in protecting her from sexually transmitted diseases?

• 3)

What are the functions performed by the testis in human beings?

• 4)

Why does menstruation occur?

• 5)

Draw a labelled diagram of the longitudinal section of a flower.

#### CBSE 10th Science Periodic Classification of Elements Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)

• 2)

What were the criteria used by Mendeleev in creating his Periodic Table?

• 3)

In the Modern Periodic Table, which are the metals among the first ten elements?

• 4)

(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common?

• 5)

Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?

#### CBSE 10th Science Carbon and Its Compounds Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?

• 2)

How would you distinguish experimentally between an alcohol and a carboxylic acid?

• 3)

What will be the formula and electron dot structure of cyclopentane?

• 4)

Explain the formation of scum when hard water is treated with soap.

• 5)

Draw the electron dot structure of ethyne and also draw its structural formula.

#### CBSE 10th Science - Science Sources of Energy Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

What is a good fuel?

• 2)

If you should use any source of energy for heating your food which one would you use and why?

• 3)

What are the disadvantages of fossil fuels?

• 4)

What are the limitations of energy that can be obtained from the oceans?

• 5)

What are the advantages of nuclear energy?

#### CBSE 10th Science Magnetic Effects of Electric Current Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

List the properties of magnetic lines of force.

• 2)

Why don't two magnetic lines of force intersect each other?

• 3)

State Fleming's Left hand Rule.

• 4)

What is the principle of an electric motor ?

• 5)

An electric oven of 2kW is operated in a domestic electric circuit (220 v) that has a current rating of 5 A. What results do you expect ? EXplain.

#### 10th Standard CBSE Science - Electricity Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Define the unit of current.

• 2)

Calculate the number of electrons constituting one coulomb of charge.

• 3)

Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?

• 4)

An electric lamp of 100$\Omega$ , a toaster of resistance 50$\Omega$, and a water filter of resistance 500$\Omega$ are connected in parallel to a 220 V source that takes as much current as all the appliances, and what is the current through it?

• 5)

An electric motor takes 5A from a 220 V line. Determine of the motor and the energy consumed in 2 hours.

#### CBSE 10th Science - Control and Coordination Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

What is the difference between a reflex action and walking?

• 2)

What is the role of the brain in reflex action?

• 3)

What are plant hormones?

• 4)

How do auxins promote the growth of a tendril around a support?

• 5)

Why are some patients of diabetes treated by giving injections of insulin?

#### CBSE 10th Science - Life ProcessTwo Marks Questions - by Prerna - Bangalore - View & Read

• 1)

What is the role of the acid in our stomach?

• 2)

What is the function of digestive enzymes?

• 3)

What are the methods used by plants to get rid of excretory products?

• 4)

How the process of digestion will be affected if the bile ducts get blocked?

• 5)

Two green plants are kept separately in oxygen free containers, one in the dark and the other in continuous light.Which one will live longer? Give reasons.

#### CBSE 10th Science - Metals and Non-Metals Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Explain the meanings of malleable and ductile.

• 2)

(a) What would you observe when zinc is added to a solution of Iron (II) sulphate?

(b) Write the chemical reaction that takes place.

• 3)

Name two metals which are found in nature in the free state.

• 4)

What chemical process is used for obtaining a metal from its oxide?

• 5)

What are amphoteric oxides? Give two examples of amphoteric oxides.

#### CBSE 10th Science - Acids, Bases and Salts Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

How is the concentration of hydronium ions affected when a solution of an acid is diluted?

• 2)

How is the concentration of hydroxide ions affected when excess base is dissolved in a solution of sodium hydroxide.

• 3)

Write an equation to show the reaction between plaster of paris and water.

• 4)

Write word equations and then balanced equations for the reaction taking place when-

(a) dilute sulphuric acid reacts with zinc granules.

(b) dilute hydrochloric acid reacts with magnesium ribbon

(c) dilute sulphuric acid reacts with aluminium powder

(d) dilute hydrochloric acid reacts with iron filings.

• 5)

A milkman adds a very small amount of baking soda to fresh milk.

(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?

(b) Why does this milk take a long time to set as curd?

#### 10th CBSE Science Unit 1 Chemical Reactions and Equations Two Marks Questions - by Prerna - Bangalore - View & Read

• 1)

Why should a magnesium ribbon be cleaned before burning in air?

• 2)

Why is the amount of gas collected in one of the test tubes? name this gas.

• 3)

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

• 4)

Balance the following chemical equations.
(a) HNO3 + Ca(OH)2 $\rightarrow$ Ca(NO3)2 + H2O
(b) NaOH + H2SO4 $\rightarrow$ Na2SO4 + H2O
(c) NaCl + AgNO3 $\rightarrow$ AgCl + NaNO3
(d) BaCl2 + H2SO4 $\rightarrow$ BaSO4 + HCl

• 5)

Write the balanced chemical equations for the following reactions.
(a) Calcium hydroxide + Carbon dioxide $\rightarrow$ Calcium carbonate + Water
(b) Zinc + silver nitrate $\rightarrow$ Zinc nitrate + Silver
(c) Aluminium + Copper chloride $\rightarrow$ Aluminium chloride + Copper
(d) Barium chloride + Potassium Sulphate $\rightarrow$ Barium sulphate + Potassium chloride

#### CBSE 10th Science Unit 16 Management of Natural Resources Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

From the list given below pick the item that is not a natural resource

• 2)

The main cause for abundant coliform bacteria in the river Ganga is

• 3)

A successful forest conservation strategy should involve

• 4)

Expand the abbreviation GAP

• 5)

Select the incorrect statement

#### CBSE 10th Science Unit 15 - Our Environment Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

Which of the following groups contain only  biodegradable items?

• 2)

Which of the following constitute a food-chain?

• 3)

Which of the following are environment -friendly practices?

• 4)

An ecosystem includes

• 5)

Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as

#### CBSE 10th Science - The Human Eye and the Colourful World Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

The human eye can focus object at different disrtances by adjusting the focal length of the eye lens.This is due to

• 2)

The human eye forms the image of an object at its

• 3)

The least distance of distinct vision for a young adult with normal vision for a young

• 4)

The change in focal length of an eye lens is caused by the action of the

• 5)

A person cannot see distinctly object kept beyond 2m.This defect can be corrected by using a lens of power

#### CBSE 10th Science Unit 13 Light Reflection and Refraction Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

Which one of the following materials cannot be used to make a lens?

• 2)

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

• 3)

Which of the following can make a parallel beam of light when light from a point source is incident on it?

• 4)

Under which of the following conditions a concave mirror can form an image larger than the actual object?

• 5)

Rays from Sun converge at a point 15 cm in front of a concave mirror. Where an object should be placed so that size of its image is equal to the size of the object?

#### CBSE 10th Science Unit 12 Heredity and Evolution Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

A mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as

• 2)

Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be

• 3)

If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY) the seeds produced in FI generation are

• 4)

The maleness of a child is determined by

• 5)

A basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?

#### CBSE 10th Science Unit 11 How do Organisms Reproduce Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

Asexual reproduction takes place through budding in

• 2)

Which of the following is not a part of the female reproductive system in human beings?

• 3)

In a flower, the parts that produce male and female gametes (germ cells) are

• 4)

Characters transmitted from parents to offspring are present in

• 5)

A feature of reproduction that is common Amoeba, Spirogyra and Yeast is that

#### CBSE 10th Science - Periodic Classification of Elements Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

Element X forms a chloride with the formula XCl2 , which is a solid a high melting point. X would most likely be in the same group of the Periodic Table as :

• 2)

Which of the following statements about the Modern Periodic Table is correct:

• 3)

Which of the following is the outermost shell for elements of period 2?

• 4)

Which one of the following elements exhibit maximum number of valence electrons?

• 5)

Arrange the following elements in the order of their decreasing metallic character: Na, Si, Cl, Mg, Al

#### CBSE 10th Science Unit 9 Carbon and Its Compounds Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

Ethane, with the molecular formula C2H6 has

• 2)

Butanone is a four-carbon compound with the functional group

• 3)

A molecule of ammonia (NH3) has

• 4)

Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of

• 5)

Which of the following does not belong to the same homologous series?

#### 10th Standard CBSE Science - Sources of Energy Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

A solar water heater cannot be used to get hot water on

• 2)

Which of the following is not an example of a bio-mass energy source?

• 3)

Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun's energy?

• 4)

Acid rain happen because

• 5)

Fuel used in thermal power plant is

#### 10th Standard CBSE Science - Magnetic Effects of Electric Current Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

The magnetic field inside a long straight solenoid-carrying current

• 2)

Which of the following correctly describes the magnetic field near a long straight wire ?

• 3)

The phenomenon of electromagnetic induction is

• 4)

The essential difference between an AC generator and a DC generator is that

• 5)

At the time of short circuit, the current in the circuit

#### 10th Standard CBSE Science Unit 6 Electricity Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

Electrical resistivity of a given metallic wire depends upon

• 2)

If the current I through a resistor is increased by 100%, the increase in power dissipated will be

• 3)

In an electrical circuit two resistors of 2$\Omega$ and 4$\Omega$ respectively are connected in series to a 6 V battery. The heat dissipated by the 4$\Omega$ resistor in 5s will be

• 4)

An electric kettle consumes 1 Kw of electric power when operated at 220 V. A fuse wire of what rating must be used for it?

• 5)

Unit of electric power may also be expressed as

#### 10th Standard CBSE Science Unit 5 Control and Coordination Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

Which of the following is a plant hormone?

• 2)

The brain is responsible for

• 3)

Which is the correct sequence of the components of a reflex arc?

• 4)

Which of the following statements are true about the brain?
(i) The main thinking part of brain is hind brain
(ii) Centres of hearing, smell, memory, sight, etc. are located in forebrain.
(iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hind brain
(iv) Cerebellum does not control posture and balance of the body

• 5)

The movement of shoot towards light is

#### 10th Standard CBSE Science Unit 4 Life Process Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

The kidneys in human beings are a part of the system for

• 2)

The autotrophic mode of nutrition requires

• 3)

In which of the following groups of organisms, food material is broken down outside the body and absorbed?

• 4)

Which is the correct sequence of parts in human alimentary canal?

• 5)

In salivary amylase is lacking in the saliva which of the following events in the mouth cavity will be affected?

#### 10th Standard CBSE Science Unit 3 Metals and Non-Metals Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

Which of the following pairs will give displacement reactions?

• 2)

An element reacts with oxygen to give a compound with a high melting point. This compound is also suitable in water. The element is likely to be

• 3)

The ability of metals to be drawn into thin wire is known as

• 4)

An element X forms an oxide which turns red litmus blue. Identify whether X is a metal or non-metal

• 5)

Name a non-metal which is lustrous and a metal which is non-lustrous.

#### 10th Standard CBSE Science Unit 2 Acids, Bases and Salts Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

A solution turns red litmus blue; its pH is likely to be?

• 2)

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

(a) The temperature of the solution increases

(b) The temperature of the solution decreases

(c) The temperatures of the solution remains the same

(d) Salt formation takes place

• 3)

Which of the following salts does not contain water of crystallisation?

• 4)

Why does tooth decay start when the pH of mouth is lower than 5.5?

• 5)

How is the concentration of hydronium ions (H3O+) affected, when a solution of an acid is diluted?

#### 10th Standard CBSE Science Unit 1 Chemical Reactions and Equations Book Back Questions - by Prerna - Bangalore - View & Read

• 1)

Which of the following is not a physical change?

• 2)

Which of the following statements about the given reaction are correct?
3Fe(s) + 4H2O(g) $\rightarrow$ Fe3O4(s) + 4H2(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent

• 3)

Which of the following gases can be used for storage of fresh sample of an oil for a long time?

• 4)

Name and state the law which is kept in mind while we balance a chemical equation.

• 5)

State one basic difference between a physical change and a chemical change.

#### 10th Standard CBSE Science Unit 10 Electricity One Mark Question and Answer - by Prerna - Bangalore - View & Read

• 1)

The unit of specific resistance is

• 2)

1 kilowatt hour (kWh) is equal to

• 3)

The commonly used safety fuse wire is made of

• 4)

Electrical resistivity of a given metallic wire depends upon

• 5)

A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly

#### 10th Standard CBSE Science Unit 9 Carbon and Its Compounds One Mark Question and Answer - by Prerna - Bangalore - View & Read

• 1)

Ethane, with the molecular formula C2H6 has

• 2)

Butanone is a four-carbon compound with the functional group

• 3)

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that

• 4)

Carbon exists in the atmosphere in the form of

• 5)

Which of the following statements are usually correct for carbon compounds? These
i) are good conductors of electricity
ii) are poor conductors of electricity
iii) have strong forces of attraction between their molecules
iv) do not have strong forces of attraction between their molecules

#### 10th Standard CBSE Science Unit 8 Sources of Energy One Mark Question with Answer Key - by Prerna - Bangalore - View & Read

• 1)

A solar water heater cannot be used to get hot water on

• 2)

Which of the following is not an example of a bio-mass energy source?

• 3)

Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun's energy?

• 4)

Acid rain happen because

• 5)

Fuel used in thermal power plant is

#### 10th Standard CBSE Science Unit 7 Magnetic Effects of Electric Current One Mark Question and Answer - by Prerna - Bangalore - View & Read

• 1)

The magnetic field inside a long straight solenoid-carrying current

• 2)

Which of the following property of a proton can change while it moves freely in a magnetic field ?

• 3)

The strength of magnetic field inside a long current carrying straight solenoid is

• 4)

To convert an AC generator into DC generator

• 5)

The most important safety method used for protecting home appliances from short circuiting or overloading is

#### 10th Standard CBSE Science Unit 6 Electricity One Mark Question with Answer Key - by Prerna - Bangalore - View & Read

• 1)

Ohm's law is valid only when

• 2)

If I is the current through a wire and 1 is the charge of electron, then no. of electrons in t seconds will be

• 3)

Electrical resistivity of a given metallic wire depends upon

• 4)

A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly

• 5)

What is the maximum resistance while can be made using five resistors each of 1/5$\Omega$.

#### 10th CBSE Science Unit 5 Control and Coordination One Mark Question Paper and Answer Key - by Prerna - Bangalore - View & Read

• 1)

The brain is responsible for

• 2)

Which of the following statement is correct about receptors?

• 3)

Electrical impulse travels in a neuron from

• 4)

In a synapse, chemical signal is transmitted from

• 5)

In a neuron, conversion of electrical signal to a chemical signal occurs at/in

#### 10th Standard CBSE Science Life Process One Mark Question with Answer Key - by Prerna - Bangalore - View & Read

• 1)

The kidneys in human beings are a part of the system for

• 2)

The xylem in plants is responsible for

• 3)

The autotrophic mode of nutrition requires

• 4)

The breakdown of pyruvate to give carbon dioxide, water and energy takes place in

• 5)

Which of the following statements about the autotrophs is incorrect?

#### 10th CBSE Science Unit 3 Metals and Non-Metals One Mark Question Paper - by Prerna - Bangalore - View & Read

• 1)

Which of the following pairs will give displacement reactions?

• 2)

An element reacts with oxygen to give a compound with a high melting point. This compound is also suitable in water. The element is likely to be

• 3)

The ability of metals to be drawn into thin wire is known as

• 4)

Which one of the following metals do not react with cold as well as hot water?

• 5)

Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

#### 10th CBSE Science Unit 2 Acids, Bases and Salts One Mark Question Paper - by Prerna - Bangalore - View & Read

• 1)

A solution turns red litmus blue; its pH is likely to be?

• 2)

10 ml of a solution of NaOH is found to be completely neutralised by 8 ml of a given solution of HCl.  If we take 20 ml of the same solution of NaOH, the amount HCl solution (the same solution as before) required to neutralise it will be

• 3)

Sodium carbonate is a basic salt because it is a salt of

• 4)

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

• 5)

The pH of the gastric juices released during digestion is

#### 10th Standard CBSE Science Unit 1 Chemical Reactions and Equations One Mark Question Paper - by Prerna - Bangalore - View & Read

• 1)

Fe2O3 + 2Al $\rightarrow$ Al2O3 + 2Fe. The reaction is an example of a

• 2)

Which of the following is not a physical change?

• 3)

A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

• 4)

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

• 5)

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

#### 10th CBSE Science The Human Eye and the Colourful World Model Question Paper - by Prerna - Bangalore - View & Read

• 1)

The change in focal length of an eye lens is caused by the action of the

• 2)

A student sitting on the bench can read the letters written on the blackboard but is not able to read the letters written in his text book.Which of the following statement is correct?

• 3)

The danger signals installed at the top of tall buildings are red in colour.These can be easily seen from a distance because among all other colours, the red light

• 4)

The bluish colour of water in deep sea is due to

• 5)

Which of the following statement is correct?

#### 10th Standard CBSE Science Light Reflection and Refraction Model Question Paper - by Prerna - Bangalore - View & Read

• 1)

Which one of the following materials cannot be used to make a lens?

• 2)

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

• 3)

No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

• 4)

A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm infront of the mirror. The focal length of this mirror is.

• 5)

Which of the following statements is true?

#### 10th Standard CBSE Science Heredity and Evolution Model Question Paper - by Prerna - Bangalore - View & Read

• 1)

An example of homologous organs is

• 2)

The maleness of a child is determined by

• 3)

Select the incorrect statement

• 4)

A basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?

• 5)

In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F2 is

#### 10th Standard CBSE Science How do Organisms Reproduce Model Question Paper - by Prerna - Bangalore - View & Read

• 1)

Asexual reproduction takes place through budding in

• 2)

The anther contains

• 3)

Characters transmitted from parents to offspring are present in

• 4)

The correct sequence of reproductive stages seen in flowering plants is

• 5)

InRhizopus, tubular thread-like structures bearing sporangia at their tips are called

#### 10th Standard CBSE Science Unit 10 Periodic Classification of Elements Model Question Paper - by Prerna - Bangalore - View & Read

• 1)

Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table?

• 2)

In Mendeleev's Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later

• 3)

Which of the following statements about the Modern Periodic Table is correct:

• 4)

An element which is an essential constituent of all organic compounds belong to

• 5)

Which of the following gives the correct increasing order of the atomic radii of O, F and N?

#### 10th Standard CBSE Science Carbon and Its Compounds Model Question Paper - by Prerna - Bangalore - View & Read

• 1)

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that

• 2)

A molecule of ammonia (NH3) has

• 3)

Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of

• 4)

The soap molecule has a

• 5)

Chlorine reacts with saturated hydrocarbons at room temperature in the

#### 10th Standard CBSE Science Unit 8 Sources of Energy Model Question Paper - by Prerna - Bangalore - View & Read

• 1)

A solar water heater cannot be used to get hot water on

• 2)

In a hydro power plant

• 3)

Which part of the solar cooker is responsible for greenhouse effect?

• 4)

Choose the correct statement?

• 5)

Choose the incorrect statement

### CBSE Education Study Materials

#### 10th CBSE Science 2019 - 2020 Academic Syllabus - by Prerna - Bangalore Aug 21, 2019 Aug 21, 2019

Science 2019 - 2020 Academic Syllabus

#### How to get full marks in CBSE Class 10 Science - by ADMIN-ENGLISH Jan 23, 2019 Jan 23, 2019

• Read the NCERT textbook thoroughly.
• Balance the chemical equation properly. Unde...

#### How to score good marks in CBSE Class 10 Science - by ADMIN-ENGLISH Jan 23, 2019 Jan 23, 2019

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#### Tips to score full marks in CBSE 10th Science - by ADMIN-ENGLISH Jan 23, 2019 Jan 23, 2019

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#### CBSEStudy Material - Sample Question Papers with Solutions for Class 10 Session 2019 - 2020

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