State of motion is described by

1

(a)

position of rest

(b)

position of motion

(c)

Both (a) and (b)

(d)

None of these

Force due to the charged particles is known as

1

(a)

muscular force

(b)

magnetic force

(c)

electrostatic force

(d)

gravitational force

Which one of the following forces is a contact force?

1

(a)

Force of gravity

(b)

Force of friction

(c)

Magnetic force

(d)

Electrostatic force

Force is due to

1

(a)

motion

(b)

an interaction

(c)

collision

(d)

None of these

Some mustard oil is kept in the beaker. It will exert pressure

1

(a)

upward

(b)

downward

(c)

sideways

(d)

in all the directions

To move a loaded trolley, we have to __________ it.

1

(a)

push

The North pole of a magnet _________ the North pole of another magnet.

1

(a)

repels

When two forces act in the same direction, then the net force acting _________ is of the two forces.

1

(a)

sum

As we go high on the mountain, the __________ decreases.

1

(a)

pressure

A cyclist exerts a force of _________ on the pedle of cycle.

1

(a)

push

The blood pressure in our body balances the atmospheric pressure acting on our body.

1

(a) False

(b) True

A force can never stop a moving object.

1

(a) True

(b) False

If two forces act in opposite directions, then net force is the difference between the two forces.

1

(a) False

(b) True

The nails penetrated into the planks easily because a large force acts on a small area.

1

(a) False

(b) True

In 'tug of war' when both the teams apply equal pulling force then net force is maximum.

1

(a) True

(b) False

Where do we apply a force while walking?

2

(a)

Explain the effect that a force put on the shape of an object.

2

(a)

We do not feel atmospheric pressure on our body. Explain the reason in brief.

2

(a)

Name an activity which does not involve any pushing force.

2

(a)

An astronaut travels from the earth to the moon, how do its weight and mass change?

2

(a)

A blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron?

3

(a)

In the circuit shown in figure, when the key is closed, the compass needle placed in the match box deflects. Name the force which causes this deflection.

3

(a)

Mountaineers usually suffer from nose bleeding at high altitudes. Explain why.

3

(a)

An inflated gas balloon is placed in a jar which is connected to an evacuating pump. What happens if the air inside the jar is pumped out? Explain.

3

(a)

Shown struck a magnet at the top of a ramp and paper clips at the base of the ramp. He observed that the paper clip move up the ramp and attached to the magnet. What forces were acting on the paper clip as it moved up the ramp.

3

(a)

Observe the vessels A, B, C and D as shown in figure carefully.

Volume of water taken in each vessel is as shown. Arrange them in the order of decreasing pressure at the base of each vessel. Explain.

5

(a)

Amit and Sumit were good friends. They both went to gym center for exercise. As, the coach of gym told them to complete 10 dips each. So, Amit started doing it by stretching the palms on the floor while Sumit opted to do the same job on pair of rods at some height from floor.
(a) Amit got less pain while Sumit got more pain on his palm. Why?
(b) Mention the idea used by Amit here.

5

(a)