Which one of the following is not the unit of energy?

In the dams water is stored in the high reservoirs and then made to fall down. This falling water then rotates the turbines to generate electricity. In this energy conversion process can you tell the initial and final energies respectively?

A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is(g = 10 m/s2):

A body is falling from a height h. After it has fallen to a height of h/2, it will possess:

Two objects of masses 1 × 10-3kg and 4 × 10-3 kg have equal momentum. What is the ratio of their kinetic energies?

The work done on an object does not depend upon the:

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:

A microphone converts:

The sound can travel in air when:

A key of mechanical piano is first struck gently and then struck again but much harder this time. What kind of change in sound will you observe in the second case:

Before the main shock waves, the earthquake produces the characteristic sound waves which some animals like rhinoceros can hear. Can you guess the kind of sound waves produced here?

On increasing the temperature, the speed of sound in air:

Loudness measures the sound energy reaching the ear per second and depends on the amplitude of the sound wave. What is the unit used to measure the loudness of sound?

We can easily distinguish between the sounds of the different singers even without having seen them. This is all due the different quality or timber of their sounds. On what factor does the quality of sound depend?

The bats can fly in the darkness of night without colliding with the other objects by emitting special sounds while flying. Which characteristic of sound is used by the bats to navigate?