Q. Radioactive decay is a ________ change.

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

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Q. __________ moderator is used in a fast breeder reactor.

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Q. Nuclides having the same atomic number are termed as?

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

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Q. A fertile material is the one, that can be __________

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Q. The half-life period of a radioactive element depends on its __________

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Q. Which is radioactive in nature?

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Q. Which is the most commonly used nuclear fuel in boiling water reactor?

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

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Q. Fuel for a nuclear reactor (thermal) is _____________

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Q. The first underground nuclear test was conducted by India at _____________

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

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

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

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

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Q. Uranium ore is currently mined & concentrated at __________

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Q. Graphite is used in nuclear reactor as __________

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