Which of the following statement(s) about a fluid at rest in a cup is/are correct ?

1. Pressure is same at all the points in the fluid.

2. Pressure is exerted on the walls.

3. Pressure exists everywhere in the fluid.

Which one of the following device is used to measure atmospheric pressure?

Which of the following statement(s) about latent heat for a given substance is/are correct?

1. It is fixed at a given temperature.

2. It depends upon the temperature and volume.

3. It is independent of temperature and volume.

4. It depends on the temperature but independent of volume.

Which one of the following statement about the mass of a body is correct?