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Free download PDF of General knowledge(gk) multiple choice questions(mcqs) and answers on Chemistry. These general awareness quiz objective questions answers include mcqs on hydrogen, environmental pollution etc.
(51)
Which one of the following is NOT radioactive ?
[A]
Zirconium
[B]
Tritium
[C]
Francium
[D]
Astatine
Comment
(52)
Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shaver etc. ?
[A]
Iron and Cadmium
[B]
Lead peroxide and lead
[C]
Zinc and Carbon
[D]
Nickel and Cadmium
Comment
(53)
A radioactive substance has a half- life of four months. Three-fourth of the substance would decay in
[A]
3 months
[B]
4 months
[C]
8 months
[D]
12 months
(54)
The chemical used as a ‘fixer’ in photography is
[A]
Borax
[B]
Sodium sulphate
[C]
Sodium thiosulphate
[D]
Ammonium persulphate
Comment
(55)
Consider the following statements:
I. Baking soda is used in fire extinguishers
II. Quick lime is used in the manufacture of glass
III. Gypsum is used in the manufacture of Plaster of Paris
Which of the statements given above is /are correct ?
[A]
I and II
[B]
II and III
[C]
I only
[D]
I, II and III
Comment
(56)
Which one of the following does not contain silver ?
[A]
German silver
[B]
Lunar caustic
[C]
Horn silver
[D]
Ruby silver
Comment
(57)
Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are sources of lead poisoning ?
I. Smelting units
II. Pens and pencils
III. Paints
IV. Hair oils and cosmetics
[A]
I, II and III only
[B]
I and III only
[C]
II and IV only
[D]
I,II, III and IV
Comment
(58)
Which one of the following fuels causes minimum environmental pollution ?
[A]
Coal
[B]
Hydrogen
[C]
Kerosene
[D]
Diesel
Comment
(59)
Consider the following chemicals:
I. Benzene
II. Carbon tetrachloride
III. Sodium carbonate
IV. Trichloroethylene
Which of the above/ is are used as dry cleaning chemical?
[A]
I only
[B]
II only
[C]
I, II and IV only
[D]
I, II, III and IV
Comment
(60)
Which one of the following has the highest fuel value ?
[A]
Gasoline
[B]
Natural gas
[C]
Charcoal
[D]
Hydrogen
Comment
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