Physics Test - ...

When a body moves in a circular path, no work is done by the force since

A satellite is revolving in a circular orbit at a distance of 2620 km from the surface of Earth. What is the period of revolution of the satellite? (Given: Radius of Earth = 6380 km, Mass of Earth = 6 x 10²⁴ kg, G = 6.67 x 10^-11 Nm²/kg².

The first law of motion is also known as the law of

The electron in a hydrogen atom makes a transition from n = n₁ to n = n₂ state. The time period of the electron in the initial state (n₁) is eight times that in the final state (n₂). The possible values of n₁ and n₂ are:

A cricket bat is cut at the location of its centre of mass as shown. Then,

A ray incident at a point as an angle of incidence of 60^o, enters a glass sphere ofrefractive index, n= √3 and is reflected and refracted at the further surface of the sphere. The angle between the reflected and refracted rays at this surface is

A round disc of moment of inertia 'I₂' about an axis perpendicular to its plane and passing through its centre is placed gently over another disc of moment of inertia 'I₁' rotating with an angular velocity 'ω' about the same axis. The final angular velocity of the combination of discs will be

A bullet losses 1/30th of its velocity in passing through a plank. The least number of planks to stop the bullet would be

A metal plate of area 10³ cm² rests on a layer of oil 6 mm thick. A tangential force of 10^-2 N is applied on it to move it with a constant velocity of 6 cm s^-1. The coefficient of viscosity of the liquid is