Q. __________ have the same mass number, but different nuclear charge.

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Q. Which one is radioactive in nature ?

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Q. Absorption/scattering cross-section of an element is expressed in "barn", which is equivalent to

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Q. The most commonly used nuclear fuel in boiling water reactor is

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Q. Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV.

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Q. Which of the following types of nuclear reactors is most prone to radioactive hazards ?

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Q. Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235.

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Q. The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element ?

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Q. Which of the following is not used as a nuclear fuel cladding material ?

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Q. The function of moderators in nuclear reactor is to

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Q. Specific gravity of uranium and plutonium is about

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Q. Pick out the wrong statement.

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Q. If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same istotope will be __________ days.

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Q. __________ nuclear reactor does not require a heat exchanger to supply steam to power turbine.

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Q. Nuclides having the same atomic numbers are termed as

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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. A fertile material is the one, which can be

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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. Thorium metal

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

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