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