1 . Refrigerators keep food unspoiled because
    A.  at its low temperature, bacteria and moulds are inactive
    B.  at its low temperature, the germs are killed
    C.  at its low temperature, the germs are frozen
    D.  it sterilises the food
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    2 . A person having AB – group of blood can donate blood to a person having
    A.  A – group
    B.  B – group
    C.  AB – group
    D.  O – group
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    3 . Why do birds not have respiratory trouble at the time of flying at high altitude ?
    A.  Their lungs are very large
    B.  They fly inactively
    C.  They have extra air sacs
    D.  They use less oxygen
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    4 . Source of energy in ecosystem is
    A.  Sun
    B.  Green plants
    C.  Sugar produced in photosynthesis
    D.  ATP
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    5 . Which of the following elements is not present in stainless steel ?
    A.  Iron
    B.  Tungsten
    C.  Chromium
    D.  Nickel
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    6 . Select the one which is not a mixture
    A.  Air
    B.  Gasoline
    C.  LPG
    D.  Distilled water
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    7 . The temperature which has the same reading on both Fahrenheit and Celsius scales is
    A.  40°
    B.  –40°
    C.  –34°
    D.  –140°
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    8 . What is the main constituent of "Pearl" ?
    A.  Calcium carbonate and Magnesium carbonate
    B.  Calcium oxide and calcium sulphate
    C.  Calcium sulphate only
    D.  Calcium carbonate only
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    9 . The cal orie requi rement of t he body i ncreases i n wi nt er as compare d t o summer because more cal ori es are necessary to
    A.  sustain body temperature
    B.  break more proteins
    C.  make more fat in the body
    D.  compensate for falling hair
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    10 . Water and ice crystals are in equilibrium at 0°C. When pressure is applied to this system
    A.  more of ice becomes water
    B.  no effective change occurs
    C.  water changes to vapour
    D.  more amount of ice is formed
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