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  1. What is laughing gas?

    2. A.
    Nitrous Oxide
    B.
    Carbon monoxide
    C.
    Sulphur dioxide
    D.
    Hydrogen peroxide

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  2. Actinides are the elements with atomic numbers from

    3. A.
    97 to 104
    B.
    101 to 115
    C.
    89 to 103
    D.
    36 from 43

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  3. The two elements that are frequently used for making transistors are

    4. A.
    boron and aluminium
    B.
    silicon and germanium
    C.
    iridium and tungsten
    D.
    niobium and columbium

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  4. The filament of an electric bulb is made of

    5. A.
    tungsten
    B.
    nichrome
    C.
    graphite
    D.
    iron

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  5. Diamond is an allotropic form of

    6. A.
    germanium
    B.
    carbon
    C.
    silicon
    D.
    sulphur

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  6. In fireworks, the green flame is produced because of

    7. A.
    sodium
    B.
    barium
    C.
    mercury
    D.
    potassium

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  7. Permanent hardness of water can be removed by adding

    8. A.
    chlorine
    B.
    washing soda
    C.
    potassium permanganate
    D.
    bleaching powder

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  8. Marsh gas is

    9. A.
    nitrogen
    B.
    ethane
    C.
    methane
    D.
    hydrogen

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  9. LPG consists of mainly

    10. A.
    methane, ethane and hexane
    B.
    ethane, hexane and nonane
    C.
    methane, hexane and nonane
    D.
    methane, butane and propane

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  10. Air is a/an

    11. A.
    compound
    B.
    element
    C.
    electrolyte
    D.
    mixture

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