Physics Questions

What is the value of acceleration due to gravity at the centre of earth?

Which type of electromagnetic radiation has the longest wavelength?

If the resistance of a conductor is doubled, the current gets halved. This is because

If I is the current through a wire and e is the charge of an electron, then the number of electrons crossing in t seconds will be given by

A force of 20 N displaces an object through 2 m and does a work of 20 J. The angle between the force and displacement is

Which of the following is a characteristic of an exothermic reaction?

A ball is dropped from a height of 10 m. It strikes the ground and rebounds up to a height of 2. m. During the collision, the per cent loss in the kinetic energy is

Which of the following devices converts Chemical energy into Electrical energy?