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  1. The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

  2. A.
    helium
    B.
    ozone
    C.
    oxygen
    D.
    methane

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  3. The most commonly used bleaching agent is

  4. A.
    alcohol
    B.
    carbon dioxide
    C.
    chlorine
    D.
    sodium chlorine

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  5. The nucleus of a hydrogen atom consists of

  6. A.
    1 proton only
    B.
    1 proton + 2 neutron
    C.
    1 neutron only
    D.
    1 electron only

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  7. The heat required to raise the temperature of body by 1 K is called

  8. A.
    specific heat
    B.
    thermal capacity
    C.
    water equivalent
    D.
    None of the above

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  9. The nuclear particles which are assumed to hold the nucleons together are

  10. A.
    electrons
    B.
    positrons
    C.
    neutrons
    D.
    mesons

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  11. The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is

  12. A.
    2.05 gram
    B.
    3.05 gram
    C.
    4.05 gram
    D.
    5.05 gram

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  13. The octane number of zero is assigned to

  14. A.
    2-methyl octane
    B.
    n-heptane
    C.
    iso-octane
    D.
    3-methyl octane

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  15. The metal that is used as a catalyst in the hydrogenation of oils is

  16. A.
    Ni
    B.
    Pb
    C.
    Cu
    D.
    Pt

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  17. The most abundant rare gas in the atmosphere is

  18. A.
    He
    B.
    Ne
    C.
    Ar
    D.
    Xe

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  19. The Latin word formica means ant. The name formic acid is derived from this Latin word because

  20. A.
    this acid, in ancient times, was used to eliminate ant-hills
    B.
    this corrosive acid is secreted by ants to drive away their enemies
    C.
    this acid was first obtained by the distillation of ants
    D.
    ants are attracted by the odour of this acid

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