1000 Best General Science MCQ-Questions
Q81). Which of the following is used as a moderator in nuclear reactor?
a).Thorium
b).Graphite
c).Radium
d).Ordinary water
Correct Answer:
Graphite
Explanation:
Q82). 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
Correct Answer:
Alpha ray
Explanation:
Q83). Atoms are composed of
a).electrons and protons
b).electrons only
c).protons only
d).electrons and nuclei
Correct Answer:
electrons and nuclei
Explanation:
Q84). 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
Correct Answer:
conversion of mass into energy
Explanation:
Q85). Isotopes are separated by
a).crystallisation
b).sublimation
c).distillation
d).filtration
Correct Answer:
distillation
Explanation:
Q86). The wavelength of X-rays is of the order of
a).10 micron
b).1 angstrom
c).1 cm
d).1 m
Correct Answer:
1 angstrom
Explanation:
Q87). Mesons are found in
a).Laser beam
b).X-rays
c).Gamma rays
d).Cosmic rays
Correct Answer:
Cosmic rays
Explanation:
Q88). Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
a).Thorium
b).Radium
c).Plutonium
d).Radan
Correct Answer:
Thorium
Explanation: