Physics Past Questions and Answers

A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

A 2H inductor has negligible resistance and is connected to a \(\frac{50}{\pi}\) Hz A.C supply. The reactance of the inductor is?

An astronomical telescope is said to be in normal adjustment when the?

The velocities of light in air and glass are 3.0 x 10\(^8\)ms\(^{-1}\) and 2.0 x 10\(^8\)ms\(^{-1}\) respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?

The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a?