General Science - Nuclear Science

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

U-235 U-245 U-239 U-238

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

Ra - Si method Potassium - argon method C14 method Uranium - lead method

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

absorption of corresponding wavelengths by the outer layers of the sun 

destructive interference between waves of certain definite wavelengths 

absorption of corresponding wavelengths by the prism used in the photograph 

absence of corresponding wavelengths from the light emitted by the core of the sun

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

gravitational forces exchange forces coulombic forces magnetic forces

5. Nuclear fission is caused by the impact of

neutron proton deuteron electron

General Science - Nuclear Science

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

Thorium Graphite Radium Ordinary water

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

Beta ray Alpha ray Cathode ray Gamma ray

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

conversion of chemical energy into heat energy conversion of mechanical energy into nuclear energy conversion of mass into energy conversion of neutrons into protons

4. Isotopes are separated by

crystallisation sublimation distillation filtration

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

Thorium Radium Plutonium Radan