Nautical mile is a unit of distance used in:

Knot is a unit of speed of which of the following?

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

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

Atoms are composed of:

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

Isotopes are separated by

The wavelength of X-rays is of the order of

Mesons are found in

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