Q. Which of the following is used as a moderator in nuclear reactor?

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Q. Which among the following is a positively charged particle emitted by a radioactive element?

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Q. Atoms are composed of

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Q. In an atomic explosion, enormous energy is released which is due to

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Q. Isotopes are separated by

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Q. The wavelength of X-rays is of the order of

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Q. Mesons are found in

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Q. Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?

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Q. Which of the following shows the masses of the three elementary particles in decreasing order?

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Q. What is the wavelength of visible spectrum?

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Q. Which of the following has a least penetrating power?

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Q. The isotope of uranium capable of sustaining chain reaction is

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Q. The age of most ancient geological formations is estimated by

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Q. Who suggested that most of the mass of the atom is located in the nucleus?

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Q. The dark lines in the solar spectrum are due to

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Q. In an atomic nucleus, neutrons and protons are held together by

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Q. 'No two electrons in an atom can have the same set of four quantum numbers' is

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Q. According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ____ .

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Q. Atoms of an element differ from those of all other elements in

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Q. Nuclear fission is caused by the impact of

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