Nuclear Science mcq questions and answers for competitive exams

Posted on Jun 9, 2022 10:12 PM - 2 years ago

Nuclear Science mcq questions and answers for competitive exams UPSC SSC , SSC CGL, SSC CHSL, upsc Civils , Entrance exams Online test practice online free Quiz, mock practice online

61.

An electron has a mass that is approximately that of the proton.

1836 (approximately)

1/1836 (approximately)

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62.

The time required for half of the of a radioactive isotope to decay is called its half life.

nuclei

protons

neutrons

electrons

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63.

Nuclear fission is caused by the impact of

Proton

Neutron

Electron

Deuteron

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64.

The main ore of thorium is

galena

limonite

pitchblende

monazite sand

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65.

The isotope of uranium capable of sustaining chain reaction is

U- 235

U-238

U-239

U-245

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66.

Which of the following may not need a moderator?

Candu reactor

Fast breeder reactor

Homogeneous reactor

Pressurised water reactor

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67.

The credit of construction of first nuclear reactor goes to -

Fermi

Einstein

Niels Bohr

Oppenheimer

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68.

Mesons are found in

x-rays

Cosmic rays

Gamma rays

Laser beam

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69.

Uranium ore is currently mined & concentrated at

Khetri

Alwaye

Ghatsila

Jadugoda

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70.

Which of the following has a least penetrating power?

Gamma rays

Beta Particles

Alpha Particles

All have same penetrating power

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71.

Thorium can be converted into U-233 in a reactor.

thermal

fast breeder

swimming pool

liquid metal cooled

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72.

Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?

Radon

Radium

Thorium

Plutonium

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73.

Emission of b-particles during radioactive decay of a substance is from

nucleus

innermost shell

outermost shell

none of these

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74.

Gas cooling as compared to water cooling of nuclear reactors

can not attain a high temperature.

is more efficient as gas has a higher specific heat.

can produce only saturated steam for feeding to power turbine.

none of these.

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75.

Extraction of uranium from its ore is done using methods.

chemical

pyrometallurgical

electrometallurgical

physical beneficiation

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Nuclear Science mcq questions and answers for competitive exams