Metallurgy of Nuclear Metals MCQ Questions and Answers

81

Enriched uranium is required as a fuel in a nuclear reactor. Light water is used as moderator & coolant, because light water has

A) high neutron absorption cross-section B) low moderating efficiency C) high neutron scatter cross-section D) low neutron absorption cross-section

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Answer & Solution

Answer: Option C

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82

What is the average life of a radioactive atom having a 'half life period' of T?

A) 1.44T B) 0.144T C) 14.4T D) 2T

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Answer & Solution

Answer: Option A

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83

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

A) $${\frac{3}{4}^{th}}$$ of it will disintegrate in two months B) it will completely disintegrate in two months C) it will completely disintegrate in four months D) $${\frac{1}{8}^{th}}$$ of it will remain intact at the end of four months

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Answer & Solution

Answer: Option A

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84

The radioactive isotope of hydrogen is

A) deuterium B) tritium C) protium D) none of these

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Answer & Solution

Answer: Option D

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85

The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about . . . . . . . . metres/second.

A) 1100 B) 2200 C) 3300 D) 4400

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Answer & Solution

Answer: Option B

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86

Pick out the wrong statement.

A) Atoms with the same number of nucleons but different number of protons are called isobars B) Atoms with same number of protons but different number of nucleons are called isobars C) Out of α, β & γ - rays, the one having maximum penetration power are y-rays D) The product formed by emission of an α particle has mass number less by 4 units than the parent nuclide

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Answer & Solution

Answer: Option B

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87

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a . . . . . . . . reactor.

A) critical B) breeder C) fertile D) heterogeneous

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Answer & Solution

Answer: Option B

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88

An element having large number of . . . . . . . . is most easily subjected to nuclear fission.

A) protons B) electrons C) neutrons D) nucleons

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Answer & Solution

Answer: Option D

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89

A heterogeneous nuclear reactor is the one in which the moderator & the

A) coolant are different materials B) coolant are present in different phases (e.g. heavy water & graphite) C) fuel are present in different phases (e.g. uranium & heavy water) D) none of these

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Answer & Solution

Answer: Option C

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90

In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous uranium

A) oxides B) hexaflouride C) carbide D) sulphate

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Answer & Solution

Answer: Option B

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Metallurgy of Nuclear Metals MCQ Questions and Answers | Metallurgical Engineering