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1) Radiocarbon is produced in the atmosphere as a result of

    collision between fast neutrons and nitrogen nuclei present in the atmosphere
    action of ultraviolet light from the sun on atmospheric oxygen
    action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
    lightning discharge in atmosphere

Answer : A Discuss

2) It is easier to roll a stone up a sloping road than to lift it vertical upwards because

    work done in rolling is more than in lifting
    work done in lifting the stone is equal to rolling it
    work done in both is same but the rate of doing work is less in rolling
    work done in rolling a stone is less than in lifting it

Answer : D Discuss

3) The absorption of ink by blotting paper involves

    viscosity of ink
    capillary action phenomenon
    diffusion of ink through the blotting
    siphon action

Answer : B Discuss

4) Siphon will fail to work if

    the densities of the liquid in the two vessels are equal
    the level of the liquid in the two vessels are at the same height
    both its limbs are of unequal length
    the temperature of the liquids in the two vessels are the same

Answer : B Discuss

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5) Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

    the heating effect of current alone
    hysteresis loss alone
    both the heating effect of current and hysteresis loss
    intense sunlight at noon

Answer : C Discuss

6) Nuclear sizes are expressed in a unit named

    Fermi
    angstrom
    newton
    tesla

Answer : A Discuss

7) Light year is a unit of

    time
    distance
    light
    intensity of light

Answer : B Discuss

8) Mirage is due to

    unequal heating of different parts of the atmosphere
    magnetic disturbances in the atmosphere
    depletion of ozone layer in the atmosphere
    equal heating of different parts of the atmosphere

Answer : A Discuss

9) Light from the Sun reaches us in nearly

    2 minutes
    4 minutes
    8 minutes
    16 minutes

Answer : C Discuss

10) Stars appears to move from east to west because

    all stars move from east to west
    the earth rotates from west to east
    the earth rotates from east to west
    the background of the stars moves from west to east

Answer : B Discuss

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