CBSE 8th Standard Science Friction Important Questions And Answers Study Material - QB365 Set C | QB365

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CBSE 8th Standard Science Friction Important Questions And Answers Study Material - QB365 Set C

Published on: 29/10/2025

Question Set C

CBSE 8th Standard Science Friction Important Questions And Answers Study Material - QB365

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Std: 8th Standard CBSE - Science

chapter: Friction - Important Questions And Answers

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Questions:

Multiple Choice Question

15 x 1 = 15

The fishes swim easily in the water because they have

(a)

more energy

(b)

streamlined shape

(c)

Both (a) and (b)

(d)

None of these

A boy rolls a rubber ball on a wooden surface. The ball travels a short distance before coming to rest. To make the same, ball travel longer distance before coming to rest, he may

(a)

spread a carpet on the wooden surface

(b)

cover the ball with a piece of cloth

(c)

sprinkle talcum powder on the wooden surface

(d)

sprinkle sand on the wooden surface

Rolling friction is smaller than

(a)

sliding friction

(b)

static friction

(c)

fluid friction

(d)

All of these

Which of the following statements is incorrect?

(a)

Friction acts on a ball rolling along the ground

(b)

Friction acts on a boat moving on water

(c)

Friction acts on a bicycle moving on a smooth road

(d)

Friction does not act on a ball moving through air

Fine powder is poured on the carromboard to

(a)

increase friction

(b)

decrease friction

(c)

Both (a) and (b)

(d)

None of these

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

To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?

(a)

Stone

(b)

Plastic block

(c)

Wooden block

(d)

Glass block

10.

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 (\(\uparrow\))

11.

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

12.

Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play

(a)

only if the objects are solid

(b)

only if one of the two objects is liquid

(c)

only if one of the two objects is gaseous

(d)

irrespective of whether the objects are solids, liquids or gases

13.

Friction is due to

(a)

polishing of surface

(b)

streamlining of body

(c)

interlocking of irregularities

(d)

None of the above

14.

The force of friction always

(a)

opposes motion

(b)

helps the motion

(c)

Both of these

(d)

None of the above

15.

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

Generic 3

5 x 3 = 15

16.

Explain why climbing a greasy pole is very difficult.

17.

A father and son pushed their car to bring it to the side of road as it had stalled in the middle of the road. They experienced that although they had to push with all their might initially to move the car, the push required to keep the car rolling was smaller, once the car started rolling. Explain.

18.

Explain why the surface of mortar and pestle (silbatta) used for grinding is etched again after prolonged use.

19.

Explain the reason of rubbing the hands in winters.

20.

Explain why sportsmen use shoes with spikes.

Generic 2

5 x 2 = 10

21.

State the reason, why do we slip when we step on a banana peel.

22.

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

23.

Mention the moment when the rolling friction comes into play.

24.

Name the type of surfaces that has more irregularities smooth or rough.

25.

Name the force helps to writs ty chalk on blackboard.

Generic 5

2 x 5 = 10

26.

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.

27.

Explain with the help of an example that heat is produced by friction.

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Answers Key:

Multiple Choice Question

15 x 1 = 15

(b)
streamlined shape

(d)
All of these

(d)
Friction does not act on a ball moving through air

(b)
decrease friction

(b)
decrease

(b)
making grooves and treads

(b)
polished marble surface

(a)
Stone

10.

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

11.

(b)
reduced

12.

(d)
irrespective of whether the objects are solids, liquids or gases

13.

14.

(a)
opposes motion

15.

Generic 3

5 x 3 = 15

16.

If a pole is polished with grease, then the surface of pole becomes smoother thus reducing friction. So, climbing a greasy pole becomes tough.

17.

When the car is at rest, we have to apply greater force because the value of static friction is more. As the car starts moving, the friction changes into the rolling friction which is always less than the previous one. So, we have to exert the lesser force to keep it in motion.

18.

After prolonged use, the mortar and pestle loose the roughness, due to which frictional force reduces and it does not work properly. So, we have to etch it to make it rough again.

19.

As rubbing of hands against each other causes the friction between them and it produces heat which makes us warm. That's why we rub our hands to make them warm when we feel cold.

20.

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

Generic 2

5 x 2 = 10

21.

As we step on a banana peel, then there is no grip between our foot and the banana peel due to very less friction. So, we slip accidentally.

22.

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.

23.

The rolling friction comes into play when one body rolls over the surface of another.

24.

Rough surfaces have more irregularities.

25.

Frictional force helps to write by chalk on blackboard.

Generic 5

2 x 5 = 10

26.

(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.

27.

As friction opposes the relative motion between the two surfaces also produce heat. So, when we rub our hands together vigorously for few minutes, we feel hotness when we strike a matchstick against the rough surface due to which it catches fire. In machineries also, heat is produced due to friction as the machine parts rub against each other.