10th Standard Science English Medium Free Online Test Book Back 1 Mark Questions with Answer Key Part - 2

10th Standard

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Science

Time : 00:20:00 Hrs
Total Marks : 20

    Part A

    20 x 1 = 20
  1. 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%

  2. The eye defect ‘presbyopia’ can be corrected by

    (a)

    convex lens

    (b)

    concave lens

    (c)

    convex mirror

    (d)

    Bi focal lenses

  3. 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.

  4. 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

  5. _____________ aprons are used to protect us from gamma radiations

    (a)

    Lead oxide

    (b)

    Iron

    (c)

    Lead

    (d)

    Aluminium

  6. Mass of 1 mole of Nitrogen atom is

    (a)

    28 amu

    (b)

    14 amu

    (c)

    28 g

    (d)

    14 g

  7. Chemical formula of rust is ________.

    (a)

    FeO.xH2O

    (b)

    FeO4.xH2O

    (c)

    Fe2O3.xH2O

    (d)

    FeO

  8. Solubility of NaCl in 100 ml water is 36 g. If 25 g of salt is dissolved in 100 ml of water how much more salt is required for saturation _____________

    (a)

    12g

    (b)

    11g

    (c)

    16g

    (d)

    20g

  9. Powdered CaCO3 reacts more rapidly than flaky CaCO3 because of

    (a)

    large surface area

    (b)

    high pressure

    (c)

    high concentration

    (d)

    high temperature

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

    (a)

    95.5 %

    (b)

    75.5 %

    (c)

    55.5 %

    (d)

    45.5 %

  11. Kreb’s cycle takes place in

    (a)

    chloroplast

    (b)

    mitochondrial matrix

    (c)

    stomata

    (d)

    inner mitochondrial membrane

  12. Mammals are ______________ animals.

    (a)

    Cold blooded

    (b)

    Warm blooded

    (c)

    Poikilothermic

    (d)

    All the above

  13. Which is the sequence of correct blood flow

    (a)

    ventricle - atrium - vein - arteries

    (b)

    atrium - ventricle - veins - arteries

    (c)

    atrium - ventricle - arteries - vein

    (d)

    ventricles - vein - atrium - arteries

  14. Which nervous band connects the two cerebral hemispheres of brain?

    (a)

    thalamus

    (b)

    hypothalamus

    (c)

    corpus callosum

    (d)

    pons

  15. LH is secreted by

    (a)

    Adrenal gland

    (b)

    Thyroid gland

    (c)

    Anterior pituitary

    (d)

    Hypothalamus.

  16. Male gametes in angiosperms are formed by the division of ___________

    (a)

    Generative cell

    (b)

    Vegetative cell

    (c)

    Microspore mother cell

    (d)

    Microspore

  17. Okasaki fragments are joined together by ___________________.

    (a)

    Helicase

    (b)

    DNA polymerase

    (c)

    RNA primer

    (d)

    DNA ligase

  18. Himgiri developed by hybridisation and selection for disease resistance against rust pathogens is a variety of _______.

    (a)

    chilli

    (b)

    maize

    (c)

    sugarcane

    (d)

    wheat

  19. Cancer cells are more easily damaged by radiations than normal cells because they are

    (a)

    Different in structure

    (b)

    Non dividing

    (c)

    Starved mutation

    (d)

    Undergoing rapid division

  20. Global warming will cause

    (a)

    raise in level of oceans

    (b)

    melting of glaciers

    (c)

    sinking of islands

    (d)

    all of these

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