Which of the following statements regarding natural radioactivity is true?
It is spontaneous disintegration of atoms
It is induced by bombardment with projectiles
It is transmutation of atoms with projectiles
It is dependent on temperature
Correct Answer :
A. It is spontaneous disintegration of atoms
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pig iron
nickel steel
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liquid. Chlorine
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Kerosene oil
Diesel oil
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Cholera
Dysentery
Diabetes
Measles
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in the treatment of malaria
to relieve sleepiness
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nitric acid
ammonia
nitrous acid
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nitrogen pentoxide
nitrous oxide
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Ammonium nitrate
Nitre
Charcoal powder
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number of neutrons in the nucleus
number of protons and neutrons in the nucleus
the valency of the element
number of protons in the nucleus
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a protein
a lipid
a hormone
Vinegar is the trade name for
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acetic acid
phenol
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dehydration
dialysis
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iodine in alcohol
sulphur in carbon disulphide
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protons
protons and neutrons
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In addition to nitric acid, another acid which may render iron passive is
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oxalic acid
chromic acid
citric acid
Brass contains
copper and tin
aluminium and magnesium
copper and zinc
copper, tin and zinc
The gas which has a faint sweet odour is
nitrogen
nitrous oxide
nitric oxide
nitrogen peroxide
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shaking with water
fractional distillation of liquid air
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Aluminium
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pellagra
night blindness
anaemia