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Bookback Important 1 Marks Questions

10th Standard EM

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Science

Time : 01:00:00 Hrs
Total Marks : 150

    Part A 

    69 x 1 = 69
  1. The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be____kg

    (a)

    4 M

    (b)

    2 M

    (c)

    M/4

    (d)

    M

  2. If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body on the Earth will

    (a)

    decrease by 50%

    (b)

    increase by 50%

    (c)

    decrease by 25%

    (d)

    increase by 300%

  3. To project the rockets which of the following principle(s) is /(are) required?

    (a)

    Newton’s third law of motion

    (b)

    Newton’s law of gravitation

    (c)

    law of conservation of linear momentum

    (d)

    both a and c

  4. The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in

    (a)

    A

    (b)

    B

    (c)

    C

    (d)

    D

  5. A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce

    (a)

    a convergent beam of light

    (b)

    a divergent beam of light

    (c)

    a parallel beam of light

    (d)

    a coloured beam of light

  6. Which of the following lens would you prefer to use while reading small letters found in a dictionary?

    (a)

    A convex lens of focal length 5 cm

    (b)

    A concave lens of focal length 5 cm

    (c)

    A convex lens of focal length 10 cm

    (d)

    A concave lens of focal length 10 cm

  7. The value of universal gas constant

    (a)

    3.81 mol–1 K–1

    (b)

    8.03 mol–1 K–1

    (c)

    1.38 mol–1 K–1

    (d)

    8.31 mol–1 K–1

  8. If a substance is heated or cooled, the linear expansion occurs along the axis of

    (a)

    X or –X

    (b)

    Y or –Y

    (c)

    both (a) and (b)

    (d)

    (a) or (b)

  9. Temperature is the average ______ of the molecules of a substance

    (a)

    difference in K.E and P.E

    (b)

    sum of P.E and K.E

    (c)

    difference in T.E and P.E

    (d)

    difference in K.E and T.E

  10. Which of the following is correct?

    (a)

    Rate of change of charge is electrical power

    (b)

    Rate of change of charge is current.

    (c)

    Rate of change of energy is current.

    (d)

    Rate of change of current is charge.

  11. In a simple circuit, why does the bulb glow when you close the switch?

    (a)

    The switch produces electricity

    (b)

    Closing the switch completes the circuit.

    (c)

    Closing the switch breaks the circuit.

    (d)

    The bulb is getting charged.

  12. Kilowatt hour is the unit of

    (a)

    resistivity

    (b)

    conductivity

    (c)

    electrical energy

    (d)

    electrical power

  13. Velocity of sound in a gaseous medium is 330 m s-1. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is

    (a)

    330 m s-1

    (b)

    660 m s-1

    (c)

    165 ms-1

    (d)

    990 ms-1

  14. The velocity of sound in air at a particular temperature is 330 m s-1. What will be its value when temperature is doubled and the pressure is halved?

    (a)

    330 m s-1

    (b)

    165 m s-1

    (c)

    330 x \(\sqrt { 2 } \) m s-1

    (d)

    320/\(\sqrt { 2 } \) ms-1

  15. Velocity of sound in the atmosphere of a planet is 500 m s-1. The minimum distance between the sources of sound and the obstacle to hear the echo, should be

    (a)

    17 m

    (b)

    20 m

    (c)

    25 m

    (d)

    50 m

  16. Man-made radioactivity is also known as

    (a)

    Induced radioactivity

    (b)

    Spontaneous radioactivity

    (c)

    Artificial radioactivity

    (d)

    a & c

  17. Gamma radiations are dangerous because

    (a)

    it affects eyes & bones

    (b)

    it affects tissues

    (c)

    it produces genetic disorder

    (d)

    it produces enormous amount of heat

  18. Kamini reactor is located at __________

    (a)

    Kalpakkam

    (b)

    Koodankulam

    (c)

    Mumbai

    (d)

    Rajasthan

  19. In the nucleus of 20Ca40, there are 

    (a)

    20 protons and 40 neutrons

    (b)

    20 protons and 20 neutrons

    (c)

    20 protons and 40 electrons

    (d)

    40 protons and 20 electrons

  20. The gram molecular mass of oxygen molecule is

    (a)

    16 g

    (b)

    18 g

    (c)

    32 g

    (d)

    17 g

  21. 1 mole of any substance contains __________ molecules

    (a)

    6.023 × 1023

    (b)

    6.023 × 1023

    (c)

    3.0115 × 1023

    (d)

    12.046 × 1023

  22. The basis of modern periodic law is__________

    (a)

    atomic number

    (b)

    atomic mass

    (c)

    isotopic mass

    (d)

    number of neutrons

  23. _____ is a relative periodic property

    (a)

    atomic radii

    (b)

    ionic radii

    (c)

    electron affinity

    (d)

    electronegativity

  24. The process of coating the surface of metal with a thin layer of zinc is called______.

    (a)

    painting

    (b)

    thinning

    (c)

    galvanization

    (d)

    electroplating

  25. A solution is a __________ mixture.

    (a)

    homogeneous

    (b)

    heterogeneous

    (c)

    homogeneous and heterogeneous

    (d)

    non homogeneous

  26. Which of the following is the universal solvent?

    (a)

    Acetone

    (b)

    Benzene

    (c)

    Water

    (d)

    Alcohol

  27. Which of the following is hygroscopic in nature?

    (a)

    ferric chloride

    (b)

    copper sulphate penta hydrate

    (c)

    silica gel

    (d)

    none of the above

  28. H2(g) + Cl29(g) → 2HCl(g) is a

    (a)

    Decomposition Reaction

    (b)

    Combination Reaction

    (c)

    Single Displacement Reaction

    (d)

    Double Displacement Reaction

  29. Which of the following is not an“element + element → compound” type reaction?

    (a)

    C(s) + O2(g) → CO2(g)

    (b)

    2K(s) + Br2(l) → 2KBr(s)

    (c)

    2CO(g) + O2(g) → 2CO2(g)

    (d)

    4Fe(s) + 3O2(g) → 2Fe2O3(s)

  30. The pH of a solution is 3. Its [OH–] concentration is

    (a)

    1 × 10–3 M

    (b)

    3M

    (c)

    1 × 10–11 M

    (d)

    11 M

  31. The secondary suffix used in IUPAC nomenclature of an aldehyde is ____

    (a)

    - ol

    (b)

    – oic acid

    (c)

    – al

    (d)

    - one

  32. C2H5OH + 3O2 → 2CO2 + 3H2O is a

    (a)

    Reduction of ethanol

    (b)

    Combustion of ethanol

    (c)

    Oxidation of ethanoic acid

    (d)

    Oxidation of ethanal

  33. Rectified spirit is an aqueous solution which contains about _______ of ethanol

    (a)

    95.5 %

    (b)

    75.5 %

    (c)

    55.5 %

    (d)

    45.5 %

  34. The endarch condition is the characteristic feature of

    (a)

    root

    (b)

    stem

    (c)

    leaves

    (d)

    flower

  35. Which is formed during anaerobic respiration

    (a)

    Carbohydrate

    (b)

    Ethyl alcohol

    (c)

    Acetyl CoA

    (d)

    Pyruvate

  36. Kreb’s cycle takes place in

    (a)

    chloroplast

    (b)

    mitochondrial matrix

    (c)

    stomata

    (d)

    inner mitochondrial membrane

  37. The segments of leech are known as

    (a)

    Metameres (somites)

    (b)

    Proglottids

    (c)

    Strobila

    (d)

    All the above

  38. The body of leech has

    (a)

    23 segments

    (b)

    23 segments

    (c)

    38 segments

    (d)

    30 segments

  39. The animals which give birth to young ones are

    (a)

    Oviparous

    (b)

    Viviparous

    (c)

    Ovoviviparous

    (d)

    All the above

  40. Active transport involves

    (a)

    movement of molecules from lower to higher concentration

    (b)

    expenditure of energy

    (c)

    it is an uphill task

    (d)

    all of the above

  41. During transpiration there is loss of

    (a)

    carbon dioxide

    (b)

    oxygen

    (c)

    water

    (d)

    none of the above

  42. ‘Heart of heart’ is called

    (a)

    SA node

    (b)

    AV node

    (c)

    Purkinje fibres

    (d)

    Bundle of His

  43. Bipolar neurons are found in

    (a)

    retina of eye

    (b)

    cerebral cortex

    (c)

    embryo

    (d)

    respiratory epithelium

  44. The outer most of the three cranial meninges is

    (a)

    arachnoid membrane

    (b)

    piamater

    (c)

    duramater

    (d)

    myelin sheath

  45. Vomiting centre is located in

    (a)

    medulla oblongata

    (b)

    stomach

    (c)

    cerebrum

    (d)

    hypothalamus

  46. The hormone which has positive effect on apical dominance is:

    (a)

    Cytokinin

    (b)

    Auxin

    (c)

    Gibberellin

    (d)

    Ethylene

  47. Avena coleoptile test was conducted by

    (a)

    Darwin

    (b)

    N. Smit

    (c)

    Paal

    (d)

    F.W. Went

  48. To increase the sugar production in sugarcanes they are sprayed with _______

    (a)

    Auxin

    (b)

    Cytokinin

    (c)

    Gibberellins

    (d)

    Ethylene

  49. The plant which propagates with the help of its leaves is ___________

    (a)

    Onion

    (b)

    Neem

    (c)

    Ginger

    (d)

    Bryophyllum

  50. Syngamy results in the formation of____________

    (a)

    Zoospores

    (b)

    Conidia

    (c)

    Conidia

    (d)

    Chlamydospores

  51. A single highly coiled tube where sperms are stored, get concentrated and mature is known as

    (a)

    Epididymis

    (b)

    Vasa efferentia

    (c)

    Vas deferens

    (d)

    Seminiferous tubules

  52. 9 : 3 : 3 : 1 ratio is due to

    (a)

    Segregation

    (b)

    Crossing over

    (c)

    Independent assortment

    (d)

    Recessiveness

  53. The _____________ units form the backbone of the DNA.

    (a)

    5 carbon sugar

    (b)

    Phosphate

    (c)

    Nitrogenous bases

    (d)

    Sugar phosphate

  54. The number of chromosomes found in human beings are __________________.

    (a)

    22 pairs of autosomes and 1 pair of allosomes

    (b)

    22 autosomes and 1 allosome

    (c)

    46 autosomes

    (d)

    46 pairs autosomes and 1 pair of allosomes.

  55. Biogenetic law states that ___________

    (a)

    Ontogeny and phylogeny go together

    (b)

    Ontogeny recapitulates phylogeny

    (c)

    Phylogeny recapitulates ontogeny

    (d)

    There is no relationship between phylogeny and ontogeny

  56. The ‘use and disuse theory’ was proposed by __________.

    (a)

    Charles Darwin

    (b)

    Ernst Haeckel

    (c)

    Jean Baptiste Lamarck

    (d)

    Gregor Mendel

  57. Paleontologists deal with

    (a)

    Embryological evidences

    (b)

    Fossil evidences

    (c)

    Vestigial organ evidences

    (d)

    All the above

  58. Which of the following is used to produce products useful to humans by biotechnology techniques?

    (a)

    enzyme from organism

    (b)

    live organism

    (c)

    vitamins

    (d)

    both (a) and (b)

  59. We can cut the DNA with the help of

    (a)

    scissors

    (b)

    restriction endonucleases

    (c)

    knife

    (d)

    RNAase

  60. In a hexaploid wheat( 2n = 6 x = 42 ) the haploid (n) and the basic(x) number of chromosomes are

    (a)

    n = 7 and x = 21

    (b)

    n = 21 and x = 21

    (c)

    n = 7 and x = 7

    (d)

    n = 21 and x = 7

  61. Excessive consumption of alcohol leads to

    (a)

    Loss of memory

    (b)

    Cirrhosis of liver

    (c)

    State of hallucination

    (d)

    Supression of brain

  62. Cancer of the epithelial cells is called

    (a)

    Leukemia

    (b)

    Sarcoma

    (c)

    Carcinoma

    (d)

    Lipoma

  63. Where does alcohol effect immediately after drinking?

    (a)

    eyes

    (b)

    auditory region

    (c)

    liver

    (d)

    central nervous system

  64. Soil erosion is more where there is

    (a)

    no rain fall

    (b)

    low rainfal

    (c)

    rain fall is high

    (d)

    none of these

  65. Common energy source in village is

    (a)

    electricity

    (b)

    coal

    (c)

    biogas

    (d)

    wood and animal dung

  66. Which of the following statement is wrong with respect to wind energy

    (a)

    wind energy is a renewable energy

    (b)

    the blades of wind mill are operated with the help of electric motor

    (c)

    production of wind energy is pollution free

    (d)

    usage of wind energy can reduce the consumption of fossil fuels.

  67. All files are stored in the _____________

    (a)

    Folder

    (b)

    box

    (c)

    Pai

    (d)

    scanner

  68. Which is used to build scripts?

    (a)

    Script area

    (b)

    Block palette

    (c)

    stage

    (d)

    sprite

  69. Which is used to edit programs?

    (a)

    Inkscape

    (b)

    script editor

    (c)

    stage

    (d)

    sprite

  70. Part B

    44 x 1 = 44
  71. Passengers lean forward when sudden brake is applied in a moving vehicle. This can be explained by ___________

    ()

     inertia of motion

  72. ___________ is used to change the speed of car.

    ()

    Gear

  73. The path of the light is called as_____________

    ()

    ray

  74. Amount of light entering into the eye is controlled by________

    ()

    Iris

  75. The value of Avogadro number ________

    ()

    6.023 x 1023 / mol (or) mol-1]

  76. According to Boyle’s law, the shape of the graph between pressure and reciprocal of volume is ______.

    ()

    straight line

  77. When a circuit is open, _____________ cannot pass through it.

    ()

    current

  78. The ratio of the potential difference to the current is known as ________.

    ()

    resistance

  79. A whistle giving out a sound of frequency 450 Hz, approaches a stationary observer at a speed of 33 m s–1. The frequency heard by the observer is (speed of sound = 330 m s–1) ______.

    ()

    500 Hz

  80. A source of sound is travelling with a velocity 40 km/h towards an observer and emits a sound of frequency 2000 Hz. If the velocity of sound is 1220 km/h, then the apparent frequency heard by the observer is ___________.

    ()

    2068 Hz

  81. The average energy released in each fusion reaction is about ________ J.

    ()

    3.84X10-12

  82. If the radiation exposure is 100 R, it may cause ______________.

    ()

    Iukemia

  83. Atoms of different elements having _______ mass number, but ________ atomic numbers are called isobars.

    ()

    same, different

  84. Relative atomic mass is otherwise known as __________

    ()

    standard atomic weight

  85. The scientist who propounded the modern periodic law is ________.

    ()

    Henry Moseley

  86. ________ and ________ are called inner transition elements

    ()

    Lanthanides, Actinides

  87. Solubility is the amount of solute dissolved in _____ g of solvent.

    ()

    100

  88. Volume persentage decreases with increases in temperature because _____.

    ()

    of expansion of liquids

  89. Electrolysis is type of _______________ reaction

    ()

    decomposition

  90. The number of products formed in a synthesis reaction is _________

    ()

    one

  91. (Saturated / Unsaturated) ___________ compounds decolourize bromine water.

    ()

    Unsaturated

  92. The alkaline hydrolysis of fatty acids is termed as _____________

    ()

    Saponification

  93. Glycolysis takes place in ________. 

    ()

    cytoplasm

  94. The source of O2 liberated in photosynthesis is __________

    ()

    water

  95. The posterior sucker is formed by the fusion of the ___________ segments

    ()

    last 7

  96. The anterior end of leech has a lobe-like structure called _____________.

    ()

    anterior sucker

  97. __________ involves evaporative loss of water from aerial parts.

    ()

    Transpiration

  98. Water enters the root cell through a __________ plasma membrane.

    ()

    root hair

  99. The two antagonistic component of autonomic nervous system are ______ and __________.

    ()

    sympathetic nerves, para sympathetic nerves

  100. _________ maintains the constant pressure inside the cranium.

    ()

    cerebro spinal fluid

  101. Gibberellins induce stem elongation in ______ plants.

    ()

    rosette

  102. The hormone which has negative effect on apical dominance is _________.

    ()

    cytokinin

  103. Planaria reproduces asexually by ___________

    ()

    Regeneration

  104. The implantation of the embryo occurs at about ___________ day of fertilization

    ()

    7th

  105. The pairs of contrasting character (traits) of Mendel are called_________

    ()

    alleles

  106. Physical expression of a gene is called _________

    ()

    phenotype

  107. The degenerated and non-functional organs found in an organism are called ______________.

    ()

    vestigial organs

  108. The forelimb of bat and human are examples of ______________ organs.

    ()

    homologous

  109. __________ cells are undifferentiated mass of cells.

    ()

    Callus

  110. In gene cloning the DNA of interest is integrated in a __________.

    ()

    vector

  111. A highly poisonous chemicals derived from tobacco is _____________

    ()

    Nicotine

  112. Insulin resistance is a condition in ______________diabetes mellitus.

    ()

    Type II

  113. Removal of soil particles from the land is called ______________.

    ()

    soil erosion

  114. ______________ is the most commonly used fuel for the production of electricity.

    ()

    Coal

  115. Part C

    44 x 1 = 44
  116. Newton’s I law

  117. (1)

    rudimentary tail and thick hair on the body

  118. Law of conservation of Linear momentum

  119. (2)

    22 pair of chromosome

  120. Retina

  121. (3)

    Absence of antigen

  122. Hypermetropia

  123. (4)

    Excessive thirst

  124. Cubical expansion

  125. (5)

    Dracaena

  126. Heat transformation

  127. (6)

    near point moves away

  128. electric current

  129. (7)

    Mumbai

  130. electrical power

  131. (8)

    Hindbrain

  132. Echo

  133. (9)

    Simple goitre

  134. Ultrasonic

  135. (10)

    Build scripts

  136. BARC

  137. (11)

    NaOH

  138. Fuel

  139. (12)

    radiocarbon dating

  140. 4 g of H2

  141. (13)

    uranium

  142. 112 g of N2

  143. (14)

    Potassium stearate

  144. Redox reaction

  145. (15)

    Translocation of food

  146. Dental filling

  147. (16)

    Semi-dwarf Rice

  148. Blue vitriol

  149. (17)

    silver-tin amalgam

  150. Deliquescence

  151. (18)

    Single Displacement

  152. NH4OH(aq) + CH3COOH(aq) → CH3COONH4(aq) + H2O(l)

  153. (19)

    energy saving

  154. Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)

  155. (20)

    Acromegaly

  156. Functional group –OH

  157. (21)

    stable equilibrium of an object

  158. Soap

  159. (22)

    2n

  160. Amphivasal

  161. (23)

    Edit programs

  162. Phloem

  163. (24)

    4 moles

  164. Leucopenia

  165. (25)

    Alcohol

  166. O blood group

  167. (26)

    CuSO4.5H2O

  168. Hypothalamus

  169. (27)

    non - renewable energy

  170. Cerebellum

  171. (28)

    22 kHz

  172. Thyroxine

  173. (29)

    Screen of the eye

  174. Growth hormone

  175. (30)

    Neutralization

  176. Gestation

  177. (31)

    hot body to cold body

  178. Ovulation

  179. (32)

    ampere

  180. Autosomes

  181. (33)

    watt

  182. Diploid condition

  183. (34)

    propulsion of a rocket

  184. Atavism

  185. (35)

    Lack of blood flow to heart muscle

  186. W.F. Libby

  187. (36)

    Attachment of zygote to endometrium

  188. IR 8

  189. (37)

    Bacillus thuringienesis

  190. Bt toxin

  191. (38)

    2 moles

  192. Polydipsia

  193. (39)

    Alumino thermic process

  194. Myocardial Infarction

  195. (40)

    Release of egg from Graffian follicle

  196. Natural gas

  197. (41)

    Ultrasonography

  198. CFL bulbs

  199. (42)

    Forebrain

  200. Script Area

  201. (43)

    Decrease in leucocytes

  202. Costume editor

  203. (44)

    change in volume

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