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Chemistry - Questions and AnswersPage 12

111.

Which of the following is used as a coolant in nuclear reactors?
(a)Heavy water
(b)Cadmium
(c)Liquid sodium
(d)Graphite
Comment
Answer is: ANA

112.

Which of the following has the least penetrating power?
(a)Alpha particles
(b)Beta particles
(c)Gamma rays
(d)All have the same penetrating power
Comment
Answer is: ANA

113.

Which of following is good nuclear fuel?
(a)Uranium-238
(b)Neptunium-239
(c)Thorium-236
(d)Plutonium-239
Comment
Answer is: ANA

114.

Enriched uranium used in a nuclear reactor is
(a)Uranium freed of all impurities
(b)Uranium alloyed with aluminium
(c)Uranium treated with radiation
(d)Uranium with high percentages of a particular isotope
Comment
Answer is: DNA

115.

Which one of the following is heavy water used in nuclear reactor?
(a)Water having molecular weight 18 u
(b)Water having molecular weight 20 u
(c)Water at 40 C but having molecular weight 19 u
(d)Water below the ice in a frozen sea
Comment
Answer is: BNA

116.

The function of heavy water in a nuclear reactor is to
(a)Slowing down the speed of neutrons
(b)Increase the speed of neutrons
(c)Cooling down the reactor
(d)Stop the nuclear reactor
Comment
Answer is: ANA

117.

A nuclear explosion for peaceful purposes is used for
(a)Power generation
(b)Making tunnels and roads
(c)Production of radio isotopes
(d)Jet propulsion
Comment
Answer is: BNA

118.

Radio carbon dating is used to estimate the age of
(a)Rocks
(b)Old monuments
(c)Fossils
(d)Living trees
Comment
Answer is: CNA

119.

The age of earth can be estimated by
(a)Radio carbon dating
(b)Radio uranium dating
(c)By its magnetic field
(d)BY its precession movement
Comment
Answer is: ANA

120.

The energy produced in stars by
(a)Nuclear fission
(b)Nuclear fusion
(c)Exothermic chemical reactions
(d)Radioactive decay
Comment
Answer is: BNA

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