Physics Past Questions and Answers

Light of energy 5eV falls on a metal of work function 3eV and electrons are liberated. The stopping potential is

The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is

A stone of mass 1kg is dropped from a height of 10m above the ground and falls freely under gravity. Its kinetic energy 5m above the ground is then equal to

If a spherical metal bob of radius 3cm is fully immersed in a cylinder containing water and the water level rises by 1cm, what is the radius of the cylinder?

The resultant of two forces acting on an object is maximum if the angle between them is