10th Standard CBSE Science Study material & Free Online Practice Tests - View Model Question Papers with Solutions for Class 10 Session 2019 - 2020
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Science Question Papers

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
    (iii) Adrenal
    (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)

    Find out about the traditional systems of water harvesting/management in your region

  • 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

10th Standard CBSE Science Magnetic Effects of Electric Current Model Question Paper - by Prerna - Bangalore - View & Read

  • 1)

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

  • 2)

    The phenomenon of electromagnetic induction is 

  • 3)

    Choose the incorrect statement from the following regarding magnetic lines of field.

  • 4)

    Choose the incorrect statement

  • 5)

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

10th Standard CBSE Science Electricity Model Question Paper - by Prerna - Bangalore - View & Read

  • 1)

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

  • 2)

    Electrical resistivity of a given metallic wire depends upon

  • 3)

    The resistivity does not charge if

  • 4)

    Unit of electric power may also be expressed as

  • 5)

    Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combination would be

10th CBSE Science Unit 5 Control and Coordination Sample Question Paper - by Prerna - Bangalore - View & Read

  • 1)

    Which of the following is a plant hormone?

  • 2)

    The brain is responsible for

  • 3)

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

  • 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 CBSE Science Unit 4 Life Process Important Question Paper - 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)

     Select the correct statement

  • 4)

    Complete digestion of carbohydrates, proteins and fats takes place in

  • 5)

    Carbohydrate in humans is stored in the form of

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

  • 1)

    Which of the following pairs will give displacement reactions?

  • 2)

    Which of the following methods is suitable for preventing an iron frying pan from rusting?

  • 3)

    Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

    (i) Good thermal conductivity

    (ii) Good electrical conductivity

    (iii) Ductility

    (iv) High melting point

  • 4)

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

  • 5)

    Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

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

  • 1)

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

  • 2)

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

  • 3)

    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 

  • 4)

    Which one of the following type of medicines is used for treating indigestion?

  • 5)

    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

10th Standard CBSE Chemical Reactions and Equations Important 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)

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

  • 3)

    What happens when dilute hydrochloride acid is added to iron fillings? Tick the correct answer.

  • 4)

    In the reaction,
    SO2(g) + 2H2S(g) \(\rightarrow\) 2H2O(l) + S(s), the reducing agent is

  • 5)

    Chemically rust is

Class 10 CBSE Science Mock Test - by Pragathi - View & Read

  • 1)

    State a reaction in which SO2 acts as an oxidising agent.

  • 2)

    What is meant by a saturated hydrocarbon?

  • 3)

    Write balanced chemical equations for each of the following reactions and also classify them.
    (a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.
    (b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.
    (c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas.
    (d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.

  • 4)

    You are given a hammer, a battery, a bulb, wires and a switch :

    (a) How could you use them to distinguish between samples of metals and non-metals?

    (b) Assess the usefulness of these tests in distinguishing between metals and non-metals.

  • 5)

    Give one example, acids and bases used in each of the following:

    (a) Calcium salt

    (b) Nitrate salt

    (c) Chloride salt

10th Standard CBSE Science Public Model Question Paper - by Pragathi - View & Read

  • 1)

    What are two types of reducing agents used to reduce metal oxide?

  • 2)

    The molecular formula of 'A'. is C10H18 and 'B' is C18H36  Name the homologous series to which they belong

  • 3)

    Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.

  • 4)

    What is lymph? How is composition of lymph different from blood plasma?  List two functions of lymphatic system.

  • 5)

    How would you derive the equivalent resistance when two resistors are placed in (a) parallel and (b) series?

How do Organisms Reproduce Important Questions 10th CBSE Science - by Pragathi - View & Read

  • 1)

    Asexual reproduction takes place through budding in

  • 2)

    The anther contains

  • 3)

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

  • 4)

    Which among the following statements are true for unisexual flowers?
    (i)They possess both stamen and pistil
    (ii)They possess either stamen or pistil
    (iii)They exhibit cross pollination
    (iv)Unisexual flowers possessing only stamens cannot produce fruits

  • 5)

    Which among the following diseases is not sexually transmitted?

10th Science Heredity and Evolution Important Questions - by Pragathi - 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)

    A zygote which has an X - chromosome inherited from the father will develop into a

  • 5)

    Select the correct statement

10th Science Light Reflection and Refraction Important Questions - by Pragathi - View & Read

  • 1)

    The image formed by a concave mirror is observed to be virtual, erect and larger than the object.Where should be the position of the object?

  • 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)

    Which of the following statements is true?

  • 5)

    Magnification produced by a rear view mirror fitted in vehicles

10th Science The Human Eye and the Colourful World Important Question Paper - by Pragathi - 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 change in focal length of an eye lens is caused by the action of the

  • 3)

    Twinkling of stars is due to atmospheric

  • 4)

    The focal length of the eye lens increases when eye muscles

  • 5)

    Which of the following statement is correct?

10th CBSE Science Our Environment Important Questions - by Pragathi - View & Read

  • 1)

    Which of the following groups contain only  biodegradable items?

  • 2)

    An ecosystem includes

  • 3)

    In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of

  • 4)

    Which of the statement is incorrect?

  • 5)

    If a grass hopper is eaten by a frog, then the energy transfer will be from

10th CBSE Science Management of Natural Resources Important Question Paper - by Pragathi - View & Read

  • 1)

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

  • 2)

    The pH range most conductive for life of fresh water plants and animals is 

  • 3)

    A successful forest conservation strategy should involve

  • 4)

    Ground water will not be depleted due to 

  • 5)

    Select the eco-friendly activity among the following

10th Science Revision Model Question Paper 1 - by Pragathi - View & Read

  • 1)

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

  • 2)

    Name the ores of mercury.

  • 3)

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

  • 4)

    What is meant by metallurgy?

  • 5)

    Which pancreatic enzyme is effective in digesting proteins?

NOVEMBER PHYSICS REVISION 2 - by MAHARISHI VIDYA MANDIR SENIOR SECONDARY - View & Read

  • 1)

    Why is the series arrangement not used for connecting domestic electric appliances in a circuit?

  • 2)

    Out of 60 W and 40 W lamps, which one has a higher electrical resistance when in use?

  • 3)

    What is the advantage of the third wire of earth connection in domestic electric appliances?

  • 4)

    Which has a higher resistance: a 50 W lamp bulb or a 25 W lamp bulb and how many times?

  • 5)

    Should the heating element of an electric iron be made of iron, silver or nichrome wire?

Chemical Reactions And Acids, Bases And Salts Important Question Paper 2 In 10th Science - by Manoj Sharma - View & Read

  • 1)

    Classify the following reactions into slow and fast reaction:
    (i) Reaction between an acid and a base
    (ii) Rusting of iron

  • 2)

    What is the role of a catalyst in a chemical 

  • 3)

    Give an example of photochemical reactions.

  • 4)

    What type of reaction is this:
    Na2SO4 + BaCl2 \(\rightarrow\) BaSO4 + 2NaCl

  • 5)

    Name the reaction seen during rancidity of food.

10th Standard CBSE Science Important Questions - by Pragathi - 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)

    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.

  • 4)

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

  • 5)

    The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in Figure. Which one of them is correct?

Light Reflection And Refraction Important Question Paper 1 In 10th Science - by Pragathi - 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)

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

  • 5)

    Which of the following statements is true?

Important Model Question Paper Of Heredity And Evolution In 10th Science - by Pragathi - View & Read

  • 1)

    An example of homologous organs is

  • 2)

    Which of the following statement is incorrect?

  • 3)

    A zygote which has an X - chromosome inherited from the father will develop into a

  • 4)

    New species may be formed if
    (i) DNA undergoes significant changes in germ cells
    (ii) chromosome number changes in the gamete
    (iii) there is no change in the genetic material
    (iv) mating does not take place

  • 5)

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

Periodic Classification Of Elements Important Question Paper 1 In 10th Science - by Pragathi - 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 Science Model Question Paper 1 - by Pragathi - View & Read

  • 1)

    Butanone is a four-carbon compound with the functional group 

  • 2)

    Buckminsterfullerene is an allotropic form of

  • 3)

    In the soap micelles

  • 4)

    The name of the compound CH3 - CH2 - CHO is

  • 5)

    Structural formula of ethyne is

Sources Of Energy Important Question Paper 1 In 10th Science - by Pragathi - View & Read

  • 1)

    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?

  • 2)

    Fuel used in thermal power plant is 

  • 3)

    In a hydro power plant

  • 4)

    Which is the ultimate source of energy?

  • 5)

    Which one of the following forms of energy leads to least environment pollution in the process of its harnessing and utilization?

Important Model Question Paper Of Magnetic Effects In 10th Science - by Pragathi - View & Read

  • 1)

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

  • 2)

    The device used for producing electric current is called a 

  • 3)

    For a current in a long straight solenoid N- and S- poles are created at the two ends. Among the following statements, the incorrect statement is 

  • 4)

    To convert an AC generator into DC generator

  • 5)

    A uniform magnetic field exists in the plane of paper pointing from left to right as shown in Figure. In the field an electron and a proton move as shown in the figure. The electron and the proton experience

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CBSE Education Study Materials

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

Science 2019 - 2020 Academic Syllabus 

How to get full marks in CBSE Class 10 Science - by ADMIN-ENGLISH 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

Science is factual as well as interesting. Science plays an important role in life.  Science...

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

Generally, 10th CBSE science comprises physics, chemistry, and Biology. Here are...

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

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