4321 .Which of the following metal does not undergo corrosion due to the formation of oxide layer -
A.  Zinc
B.  Aluminium
C.  Copper
D.  Iron
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4322 .The mass number of a nucleus is
A.  The sum of the number of protons and neutrons present in the nucleus
B.  Always more than the atomic weight
C.  A fraction
D.  Always less than its atomic number
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4323 .Which quantum number cannot have an integral value?
A.  s
B.  n
C.  m
D.  l
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4324 .The ratio of pure gold in 18 carat gold is:
A.  75%
B.  80%
C.  90%
D.  60%
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4325 .Denaturation of a protein is caused by
A.  Acid
B.  High salt concentration
C.  Heat
D.  All of the above
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4326 .The radiation initially produced in fluorescent tube is
A.  microwaves
B.  ultraviolet
C.  X-rays
D.  infrared
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4327 .Coating of solid waste with impervious material is known as
A.  Landfill
B.  Chemical fixation
C.  Encapsulation
D.  Capping
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4328 .The common name of sodium bicarbonate is
A.  Baking powder
B.  Soda lime
C.  Soda ash
D.  Baking soda
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