Waves — Physics STD 11 Science — Question

What does RADAR stand for?

Choose the correct alternative:
Acceleration due to gravity is independent of mass of the earth/ mass of the body.

What is meant by mass energy equivalence? Discuss its significance in Physics.

Is air a material medium? Name two characteristics of the material medium necessary for the onward propagation of momentum and energy.

If all the particle of a system lie in a cube, is it neccesary that the centre of mass be in the cube?

What is the use of open tube manometer?

A hollow sphere, a solid sphere, a disc and a ring all having same mass and radius are rolled down on an inclined plane. If no slipping takes place, which one will take the smallest time to cover a given length?

Passengers in a bus fall back as it accelerates. Why?

State the condition for translational equilibrium of a body.

In Regnault's apparatua for measuring specific heat capacity of a solid, there is an inlet and an outlet in the steam chamber. The inlet is near the top and the outlet is near the bottom. Why is it better than the opposite choice where the inlet is near the bottom and the outlet is near the top?