81.
Nautical mile is a unit of distance used in:

83.
Which of the following is used as a moderator in nuclear reactor?

84.
Which among the following is a positively charged particle emitted by a radioactive element?

85.
Atoms are composed of:

86.
In an atomic explosion, enormous energy is released which is due to

89.
Mesons are found in

90.
Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?

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