Physics Past Questions and Answers

The falling of light energy on a metal such that electrons are liberated from the metal is called ____________

A transformer is connected to a 250 V a.c. supply. The primary coil has 5000 turns and the secondary voltage is found to be 10 V. What is the number of turns in the secondary coil?

A negatively charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is near to it. The rod is then removed. Which statement is correct?

If the refractive index of water is 1.33, what is the critical angle for a water-air boundary?

What does NOT affect the rate of evaporation of a liquid ____________