Q. Out of the following, nucleus of __________ atom contains the largest number of neutrons.

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Q. Which of the following undergoes fission reaction easily ?

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Q. Thorium-232 (a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material.

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Q. Percentage of heavy water in ordinary water is around

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Q. Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of

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Q. Plutonium

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Q. A control rod

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Q. Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is

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Q. Enriched uranium means that, it contains

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Q. The radioisotope used to study the thyroid gland is

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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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