CBSE 8th Standard Science Force and Pressure Sample Question Papers Study Material - QB365 Set C | QB365

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CBSE 8th Standard Science Force and Pressure Sample Question Papers Study Material - QB365 Set C

Published on: 29/10/2025

Question Set C

CBSE 8th Standard Science Force and Pressure Sample Question Papers Study Material - QB365

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Std: 8th Standard CBSE - Science

chapter: Force and Pressure - Sample Question Papers

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Questions:

Generic 3

5 x 3 = 15

Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.

Determine the pressure when a force of 200 N acts on area 8m²

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.

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

In the following situation, identify the agent exerting the force and the object on which it acts. State the effect of the force in each case.
(a) Squeezing a piece of lemon between the fingers to extract its juice.
(b) Taking out paste from a toothpaste tube.
(c) A load suspended from a spring while its other end is on a hook fixed to a wall.
(d) An athlete making a high jump to clear the bar at a certain height.

Fill up / 1 Marks

5 x 1 = 5

Smooth surfaces produce ________ friction than rough surfaces.

Friction produces _________

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

Force can change the _________ of moving object.

10.

To draw water from a well, we have to _______ the rope.

Generic 2

6 x 2 = 12

11.

How many types of friction are there?

12.

Explain why a sportsman uses shoes with spikes.

13.

Why do kabbadi players rub their hands with soil?

14.

Why large vehicles have large tyres?

15.

Mention the SI unit of pressure

16.

A ball of dough is rolled into a flat chapati. Name the force exerted to change the shape of the dough.

Generic 5

2 x 5 = 10

17.

What are contact and non-contact forces? Explain briefly with suitable examples.

18.

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.

Multiple Choice Question

5 x 1 = 5

19.

In figure, a boy is shown filushing the box trom right to left.

The force of friction will act on the box

(a)

from right to left (\(\leftarrow \))

(b)

from left to right (\(\rightarrow\))

(c)

vertically downwards (\(\downarrow\))

(d)

vertically upwards (\(\uparrow\))

20.

Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.

(a)

Rolling, static, sliding

(b)

Rolling, sliding, static

(c)

Static, sliding, rolling

(d)

Sliding, static, rolling

21.

Like poles exert a force of

(a)

attraction

(b)

repulsion

(c)

Both (a) and (b)

(d)

None of these

22.

Force is due to

(a)

motion

(b)

an interaction

(c)

collision

(d)

None of these

23.

During dry weather while combing hair, sometimes we experience hair flying apart. The force responsible for this is

(a)

force of gravity

(b)

electrostatic force

(c)

force of friction

(d)

magnetic force

True or False

3 x 1 = 3

24.

Gases are only called fluids.

(a)

True

(b)

False

25.

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

(a)

True

(b)

False

26.

Only the earth exerts gravitational force.

(a)

True

(b)

False

Match the following

5 x 1 = 5

27.

Lubricants

28.

Shape of aeroplane

29.

Spring balance

30.

Electrostatic force

31.

Pressure

1 Marks

4 x 1 = 4

32.

Why are soles of the shoes and the tyres of the vehicles treaded ?

33.

Give an example which shows that friction can produce heat.

34.

The force acting on a unit area of a surface is called?

35.

Name two non-contact forces.

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Answers Key:

Generic 3

5 x 3 = 15

A book kept on tilted writing desk starts sliding down. The direction of frictional force is in the opposite direction. Thus, frictional force will act in upward direction.

Pressure = \(\frac{Force}{Area}\)
For area, A = 8m²
\(p=\frac{200}{8}=25\) N/m²or 25 Pa

On closing the switch, the current starts flowing in the wire and due to this current, a magnetic field established around the wire which exerts magnetic force on the needle and it gets deflected.

When blacksmith hammers a hot piece of iron, the force due to hammering can change the shape of the piece of iron. In other words, we can say that force applied through the hammer by the blacksmith can mould the hot piece of iron into any kind of tool.

	Agent exerting the force	Object on which it acts	Effect of the force
(a)	Fingers (squeezing the lemon)	Lemon	Extraction of juice.
(b)	Hand (or fingers)	Toothpaste tube	Coming out of paste from toothpaste tube.
(c)	Suspended load	Spring	Elongation of spring due to load on the one end of it.
(d)	Muscles of legs	Bar	Making a high jump to clear the bar at a certain height.

Fill up / 1 Marks

5 x 1 = 5

()
less

()
heat

()
pressure

()
direction

10.

()
pull

Generic 2

6 x 2 = 12

11.

There are three types of friction :
(i) Static
(ii) Sliding
(iii) Rolling

12.

Sportsman uses shoes with spikes in order to avoid getting slipped in the field. The spikes in the shoes increase the friction, so he/she can run on the ground easily.

13.

Kabbadi players rub their hands with soil to increase the friction so that they can grip the opposite team players firmly.

14.

Due to greater of large tyres, then will suffer less pressure, so the chance of tyre burst gets reduced.

15.

SI unit of pressure is N / m² or pascal.

16.

The shape of dough is changed due to muscular force applied by the hand.

Generic 5

2 x 5 = 10

17.

Forces can be of two types:
(i) Contact forces.
(ii) Non-contact forces.
(i) Contact forces : The forces that come into play when two objects come in contact with each other.
(a) Muscular force: The force which is exerted due to action of muscles is known as the muscular force. e.g., running, bending, walking etc.
(b) Frictional Force: The force responsible for changing the state of motion of an object. Equal and opposite forces are being exerted on an object when its surface comes in contact with other surface. e.g., a car or scooter comes to rest.
(ii) Non-contact forces: The forces that can be exerted from a distance without establishing a contact are called the non-contact forces.
(a) Magnetic forces : Force exerted by a magnet on another magnet or magnetic substances like iron is called magnetic force. e.g., Car sticking to an electromagnet.
(b) Electrostatic force : Force exerted by a charged body on another charged body or uncharged body is called electrostatic force. e.g., If we rub a comb with hair and bring it near some small bits of paper it attracts the bits of paper towards itself. This is electrostatic force.
(c) Force of gravity : The earth pulls every object towards its centre. The force exerted by the earth is called the force of gravity.

18.

Pressure at depth due to liquid column depends upon
(i) gravitational acceleration (g)
(ii) density of liquid
(iii) height of liquid.
And in this case, g and density are same, so only thing that can change pressure is height. So, the order of pressure exerted by the fluid A, B,C and D at the base is given by P_o > P_a > P_A > P_C

Multiple Choice Question

5 x 1 = 5

19.