Q. Nuclear reactors are provided with shield to guard against the emission of mainly __________ rays.

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Q. Mass of a positron is same as that of a/an

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Q. Radioactive decay of a material involves a __________ order reaction.

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Q. The mass number of an element is equal to the number of __________ in the nucleus.

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Q. The half life period of a radioactive element depends upon the

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Q. Fuel for a fast breeder reactor is

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Q. Fast breeder test reactor at Kalpakkam is designed for using

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

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Q. A radioactive substance does not emit

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Q. The specific heats of three gaseous coolants namely H₂, He and CO₂ in the increasing order are

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Q. Indian monazite sand contains __________ percent thorium.

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Q. Pick out the wrong statement.

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Q. Percentage of the heavy water in ordi water is around

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Q. Unit of radioactivity is

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Q. Which of the following reactors is operated at high neutron flux and low power level ?

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Q. Uranium percentage in monazite sand is about

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Q. Artificially produced radioactive isotopes are used for

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Q. In a homogeneous nuclear reactor, the __________ are mixed together.

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Q. Which of the following is not used as a moderator in nuclear reactor ?

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Q. In β-decay of radioactive material, the ratio of neutron to proton

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