General Science: Nuclear Science

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

A. Thorium
B. Graphite
C. Radium
D. Ordinary water


Answer: Option B


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

A. Beta ray
B. Alpha ray
C. Cathode ray
D. Gamma ray


Answer: Option B



3.  Atoms are composed of

A. electrons and protons
B. electrons only
C. protons only
D. electrons and nuclei


Answer: Option D



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

A. conversion of chemical energy into heat energy
B. conversion of mechanical energy into nuclear energy
C. conversion of mass into energy
D. conversion of neutrons into protons


Answer: Option C


5. Isotopes are separated by

A. crystallisation
B. sublimation
C. distillation
D. filtration


Answer: Option C



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

A. 10 micron
B. 1 angstrom
C. 1 cm
D. 1 m


Answer: Option B


7. Mesons are found in

A. Laser beam
B. X-rays
C. Gamma rays
D. Cosmic rays


Answer: Option D


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

A. Thorium
B. Radium
C. Plutonium
D. Radan


Answer: Option A


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

A. Leptons, Baryons, Mesons
B. Mesons, Baryons, Leptons
C. Baryons, Mesons, Leptons
D. Leptons, Mesons Baryons


Answer: Option C


10. What is the wavelength of visible spectrum?

A. 8500 - 9800 angstrom
B. 7800 - 8000 angstrom
C. 3900 - 7600 angstrom
D. 1300 - 3000 angstrom


Answer: Option C