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1 . When a gas is subjected to adiabatic expansion, it gets cooled due to-
A.  No chage in tntropy
B.  Loss in kinetic energy
C.  Decreases in velocity
D.  Energy spent in doing work-
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2 . The boiling point of water decreases at higher altitudes is due to
A.  Low temperature
B.  Low atmospheric pressure
C.  High temperature
D.  High atmospheric pressure
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3 . Global warming may result in-
A.  Flood
B.  cyclone
C.  Decrease in forest productivity
D.  all of the above
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4 . Which of the following is responsible for blue baby syndrome-
A.  Fluoride
B.  Nitrate
C.  Arsenic
D.  Lead
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5 . Vitamin B1 is known as-
A.  pyridoxine
B.  thiamine
C.  tocopheral
D.  riboflavin
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6 . Vitamin C is -
A.  ascorbic acid
B.  nicotinic acid
C.  citric acid
D.  tartaric acid
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7 . Power alcohol is -
A.  Absolute alcohol + Methyle alcohol
B.  Absoluted alcohol + Petrol
C.  Rectified alcohol + Petrol
D.  Denatured alcohol + Petrol
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8 . The chemical name of plaster of paris is-
A.  Calcium Chloride
B.  Calcium Nitrate
C.  Calcium Sulphate Hydrate
D.  None of these
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9 . Which of the most reactive metal?
A.  Sodium
B.  Calcium
C.  Iron
D.  Potassium
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10 . Alcoholic fermentation is brought about the action of -
A.  yeast
B.  CO2
C.  O2
D.  CO
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11 . Enzymses are -
A.  carbohydrates
B.  lipids
C.  proteins
D.  None of these
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12 . Smoke is a colloidal dispersion of a -
A.  Solid in a gas
B.  Liquid in a gas
C.  Gas in a solid
D.  Gas in a gas
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13 . Which one of the following contains cobalt?
A.  Chlorophyll
B.  Haemoglobin
C.  Vitamin C
D.  Vitamin B12
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14 . Which of the following gases is used in cigarette lighters?
A.  Butane
B.  Methane
C.  Propane
D.  Radon
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15 . Heavy water is used as a coolant in nuclear reactors Heavy water is
A.  Water rich in minerals
B.  Ozonized water
C.  Water containing minerals of heavy metal
D.  Water containg heavy isotope of hydrogen
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