If we apply a force against the direction of motion of a body, then the body will

(a)

stop moving

(b)

move with an increased speed

(c)

move with a decreased speed

(d)

move in a different direction

Which of the following liquids has more viscosity?

(a)

Grease

(b)

Water

(c)

Coconut oil

(d)

Ghee

The unit of viscosity is

(a)

Nm²

(b)

poise

(c)

kgms^–1

(d)

no unit

Name two instruments, which help to measure the pressure of a fluid.

Define one atmosphere.

Why are heavy bags provided with broad straps?

Which has greater viscosity, oil or honey? Why?

Why is a ball bearing used in a cycle hub?

Why is it not advisable to take a fountain pen while travelling in an aeroplane?

Vidhya feels that Mercury is costly. So, instead of mercury can we use water as a barometric liquid? Answer to Vidhya and explain, the difficulty of constructing a water barometer.

Give the different types of friction and explain each with an example.

Describe an experiment to prove that friction depends on the nature of a surface.

Explain how friction can be minimised.

Describe an experiment to prove that the pressure in a liquid increases with depth.