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CBSE 8th Standard Science Friction Sample Question Papers Study Material - QB365 Set D

Published on: 29/10/2025

Question Set D

CBSE 8th Standard Science Friction Sample Question Papers Study Material - QB365

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Std: 8th Standard CBSE - Science

chapter: Friction - Sample Question Papers

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Questions:

Multiple Choice Question

5 x 1 = 5

If we apply oil on door hinges, the friction will

(a)

increase

(b)

decrease

(c)

disappear altogether

(d)

will remain unchanged

We can increase the friction by

(a)

polishing

(b)

making grooves and treads

(c)

streamlining

(d)

using ball bearing

A toy car released with the same initial speed will travel farthest on

(a)

muddy surface

(b)

polished marble surface

(c)

cemented surface

(d)

brick surface

It is difficult to walk on a wall polished floor because friction between our feet and floor is

(a)

increased

(b)

reduced

(c)

same

(d)

None of these

Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be

(a)

wet marble floor, dry marble floor, newspaper, towel

(b)

newspaper, towel, dry marble floor, wet marble floor

(c)

towel, newspaper, dry marble floor, wet marble floor

(d)

Wet marble floor, dry marble floor, towel, newspaper

Generic 2

4 x 2 = 8

Why it is difficult to move on a wet marble floor?

Is frictional force a contact force?

The pieces of luggage fitted with the rollers. Explain why.

Give a reason for calling friction as a necessary evil.

Generic 3

5 x 3 = 15

10.

While travelling on a rickshaw, you might have experienced that if the seat cover is very smooth, you tend to slip when brakes are applied suddenly. Explain.

11.

Two boys are riding their bicycles on the same concrete road. One has new tyres on his bicycle while the other has tyres that are old and used. Which of them is more likely to slip while moving through a patch of the road which has lubricating oil spilled over it?

12.

The handle of a cricket bat or a badminton racquet is usually rough. Explain the reason.

13.

Name any of the five smooth surfaces from your surroundings.

14.

You might have noticed that when used for a long time, slippers with rubber soles become slippery. Explain the reason.

Generic 5

2 x 5 = 10

15.

Few days back, Shradha .a student of class VIIIth was driving the car. She went to a crop field. The level of road were just above the level of ploughed field. As she wanted to stop the slow-moving car, the brakes failed to work at that time. Suddenly, she turned the car towards the ploughed field. After sometime, the car came to rest.
(a) Shradha turned the car towards the ploughed field. Explain why.
(b) Explain, how the car came to rest after covering some distance in the ploughed field.
(c) Mention the values that Shradha exhibits here.

16.

Explain some examples where we have to reduce the friction.

Fill up / 1 Marks

5 x 1 = 5

17.

Friction can never be entirely __________

18.

We pour a drop of oil on the hinge of door to __________ friction.

19.

The substances are used in machines to protect their surfaces from wear and tear caused by ___________ are called lubricants.

20.

All objects moving in fluids have ________ shape to reduce friction.

21.

Ball bearings reduce friction because they rolls rather than ___________

True or False

5 x 1 = 5

22.

Friction is harmful always.

(a)

True

(b)

False

23.

It is easy to roll the body over one another thanto slide it.

(a)

False

(b)

True

24.

Fluid friction depends on the shape of an object placed in the fluid and nature of fluid.

(a)

False

(b)

True

25.

Friction increases with increase in smoothness of surface.

(a)

True

(b)

False

26.

Soapy floor is slippery due to less friction.

(a)

False

(b)

True

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Answers Key:

Multiple Choice Question

5 x 1 = 5

(b)
decrease

(b)
making grooves and treads

(b)
polished marble surface

(b)
reduced

The correct arrangement is as follows: Wet marble floor, dry marble floor, newspaper, towel.

Generic 2

4 x 2 = 8

On a wet marble, floor, frictional force between the foot and floor decreases making it slippery, thus we feel difficult to move on a wet marble floor.

Yes, because friction acts only when two surfaces are in contact with each other.

In order to reduce single friction, pieces of luggage are fitted with rollers so that even a child can pull the luggage easily.

Friction is a necessary evil because it causes a lot of wear and tear.

Generic 3

5 x 3 = 15

10.

If the seat cover of rickshaw is very smooth, then the friction between our body and the seat is very small. Therefore, when the brakes are applied, we tend to slip.

11.

The boy having the tyres which are old and used is most likely to slip because these tyres will experience less frictional force which is insufficient to move on the oily road.

12.

The handle of a cricket bat or badminton racquet is rough, so that while playing, the bat or badminton racquet does not slip away from the hands of the player. Roughness is responsible for the frictional force without which gripping is not possible.

13.

The five smooth surfaces are
(i) Glazed tiles
(ii) Surface of an oily plot
(iii) Surfaces of wet soaps
(iv) Mirror surface
(v) Floor of polished room

14.

It is due to continuous rubbing of soles with the ground, the spikes on the sole get damaged slowly and the soles become Slippery.

Generic 5

2 x 5 = 10

15.

(a) She turned her car towards the ploughed field to protect herself from an accident.
(b) Since, the car moved from road to the ploughed field due to which the force of friction between the tyre and the ground surface increases suddenly. Because the large amount of irregularities reduces the movement of tyre. Thus, the car came to a rest.
(c) The values displayed by Shradha are intelligence and awareness.

16.

When a fine powder sprinkled on the carrom board and a few drops of oil are poured on the hinges of a door, the door moves smoothly. A cycJe or a motor mechanic some times uses grease between the moving parts of the cycle. In all the above cases, our try was to reduce friction in order to increase efficiency.
Also, interlocking of irregularities is avoided to a great extent due to which the movement becomes smooth. The substances which reduce friction are called lubricants. In some machines, it may not be advisable to use oil as lubricant. There is an air cushion between the moving parts, that is used to reduce friction.

Fill up / 1 Marks

5 x 1 = 5

17.