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

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Q. Which is a fertile nuclear fuel ?

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Q. Graphite is used in nuclear reactor as

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Q. The ₉₂U²³⁸ emits an a-particle. The product is

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Q. 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

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Q. Thermal shield is used in high powered nuclear reactors to

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

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Q. A fast breeder reactor employs

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Q. Percentage of U-238 in natural uranium is around

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Q. Emission of β-particles during radioactive decay of a substance is from

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Q. How many atoms are present in one gm-atom of an element ?

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Q. Uranium ore is currently mined & concentrated at

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Q. Which of the following ores contains maximum percentage of uranium ?

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Q. Atoms with same number of neutrons, but different number of nucleons are called

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Q. Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.

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Q. Thorium metal

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Q. Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).

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Q. A fertile material is the one, which can be

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Q. The number of neutrons accompanying the formation of ₅₄Xe¹³⁹ and ₃₈Sr⁹⁴ from the absorption of a slow neutron by ₉₂U²³⁵ , followed by nuclear fission is

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Q. Nuclides having the same atomic numbers are termed as

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