16 .Deficiency of which one of the following cause knock knee, bow legs and pigeon chest in children-
A.  Vitamin A
B.  Vitamin B2
C.  Vitamin D
D.  Vitamin E
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17 .Cobalt - 60 is commonly used inradiation therapy because it emits-
A.  α – rays
B.  beta rays
C.  Gamma ray
D.  X – rays
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18 .At high altitudes the boiling point of water lowers because-
A.  Atmoshperic pressure is low
B.  Atmospheric pressure is high
C.  Temperature is low
D.  None of these
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19 .The enzymes are killed-
A.  At a very high temperature
B.  During chemical reaction
C.  At low temperature
D.  Under atmospheric pressure
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20 .Nitrogen in water is commonly found in the form of :
A.  Nitric oxide
B.  Nitrous oxide
C.  Nitrate
D.  Nitrite
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21 .The ore of Aluminium is
A.  Chalco pyrites
B.  Hematite
C.  Fluorspar
D.  Bauxite
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22 .Which one among the following fules is used in gas welding?
A.  LPG
B.  Ethylene
C.  Methane
D.  Acetylene
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23 .Neutrino has-
A.  charge + 1, mass 1
B.  charge 0, mass 0
C.  charge – 1, mass 1
D.  charge 0, mass 1
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24 .Fementation of ethyl alcohol into acetic acid is done by-
A.  Zymase
B.  Diastase
C.  Maltase
D.  Bacterium mycoderma aceti
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25 .Which of the following is used as raw material for the manufacture of rayon?
A.  Coal
B.  Petroleum
C.  Cellulose
D.  Plastic
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26 .When or is heated generally in absence of air then process is called-
A.  smelting
B.  roasting
C.  calcinations
D.  none
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27 .One of the best solutions to get rid of non - biodegradable wastes is
A.  Recycling
B.  Dumping
C.  Burying
D.  Burning
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28 .It is reported that there is an ongoing decrease in the pH value of ocean water because of global warming. It happens due to:
A.  larger uptake of CO2 be ocean water
B.  lesser uptake of CO2 by ocean water
C.  larger uptake of atmospheric nitrogen by ocean water
D.  lesser uptake of atmospheric nitrogen by ocean water.
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29 .Source of vitamin C is
A.  Nitric acid
B.  Ascorbic acid
C.  Oxalic acid
D.  Maleic acid
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30 .Water attains maximum density at-
A.  0° C
B.  4° F
C.  4 k
D.  4° C
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