Light year is a unit of 

Hepatitis B spreads through ___________. 

Light sensitive salts Metal is___.

Which of the following is used as a coolant in nuclear reactors?

The time period of a vibrating body is 0.04s, then the frequency of the wave is___.

Who had given the theory of Plate tectonics?

Alkaline solution is the value of Ph.

If the edge of a cube is halved, then its volume reduces to _____times the actual volume.