M.C.Q. [I MARKS]

MCQ 11 Mark

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.
✓
Friction does not act on a ball moving through air.

Answer

Correct option: D.

Friction does not act on a ball moving through air.

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MCQ 21 Mark

If we apply oil on door hinges, the friction will

A
increase
✓
decrease
C
disappear altogether
D
will remain unchanged

Answer

Correct option: B.

decrease

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MCQ 31 Mark

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
✓
sprinkle talcum powder on the wooden surface
D
sprinkle sand on the wooden surface

Answer

Correct option: C.

sprinkle talcum powder on the wooden surface

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MCQ 41 Mark

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

✓
Stone
B
Plastic block
C
Wooden block
D
Glass block

Answer

Correct option: A.

Stone

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MCQ 51 Mark

In figure, a boy is shown pushing the box from right to left.

The force of friction will act on the box

A
from right to left $(\leftarrow)$
✓
from left to right (→)
C
vertically downwards ( $(\downarrow)$
D
vertically upwards ( $\uparrow$ )

Answer

Correct option: B.

from left to right (→)

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MCQ 61 Mark

The wheel of a moving car is driven by the engine. The car is moving in the direction shown in the above diagram. In which direction, does the frictional force act on the wheel?

Answer

self

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MCQ 71 Mark

In a large commercial complex, there are four ways to reach the main road. One of the path has loose soil, the second is laid with polished marble and the third is laid with bricks and the fourth has gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is

A
loose soil
B
bricks
C
polished marble
✓
gravel

Answer

Correct option: D.

gravel

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MCQ 81 Mark

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
✓
irrespective of whether the objects are solids, liquids or gases

Answer

Correct option: D.

irrespective of whether the objects are solids, liquids or gases

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MCQ 91 Mark

The picture shows four types of shoe soles.

Which shoe sole provides the best grip and friction while walking?

A
Sole 1
B
Sole 2
C
Sole 3
✓
Sole 4

Answer

Correct option: D.

Sole 4

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MCQ 101 Mark

Assertion (A) Rocket and aeroplane has a sceciat body shape. i.e. streamlined shape.
Reason (R) Streamlined shape heips object to reduces friction drag between fluid and an object moving through it.

✓
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false.
D
A is false but R is true.

Answer

Correct option: A.

Both A and R are true and R is the correct explanation of A.

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MCQ 111 Mark

Assertion (A) We often see that suitcase fitted with wheels are easy to pull.
Reason (R) Rolling friction is smaller than the static ang sliding friction.

✓
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false.
D
A is false but R is true.

Answer

Correct option: A.

Both A and R are true and R is the correct explanation of A.

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MCQ 121 Mark

The frictional force exerted by fluids is also known as

✓
drag
B
static friction
C
rolling friction
D
sliding friction

Answer

Correct option: A.

drag

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MCQ 131 Mark

Which of the following does not reduce friction?

A
Streamlined shape
B
Lubricant
✓
Sand
D
Oil

Answer

Correct option: C.

Sand

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MCQ 141 Mark

Which of the following device is used to measure the force acting on an object?

✓
Spring balance
B
Odometer
C
Bath (a) and (b)
D
None of the above

Answer

Correct option: A.

Spring balance

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MCQ 151 Mark

Direction of friction is always

✓
opposes the motion
B
direction of motion
C
perpendicular to the motion
D
None of the above

Answer

Correct option: A.

opposes the motion

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MCQ 161 Mark

Assertion (A) It is difficult to push or pull heavier object than lighter object.
Reason (R) Interlocking of irregularities are more in between heavy object surface than light object.

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false.
D
A is false but R is true.

Answer

A. The interlocking of irregularities are more in between heavy object surface than light object. That's why, it is difficult to push or pull heavier objects.

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MCQ 171 Mark

Assertion (A) Birds can fly easily in sky.
Reason (R) Streamlined body help them in minimising the friction.

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false.
D
A is false but R is true.

Answer

A. A body shape that offers a small resistance to the flow of fluid around it, is called streamlined shape. Birds have streamlined shape by nature. That's why, they fly easily in the air.

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MCQ 181 Mark

Assertion (A) Lubricants increases the friction force.
Reason (R) Friction is a necessary evil.

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false.
D
A is false but R is true.

Answer

D. Lubricants are the materials which minimise the friction force. Friction has advantages as well as disadvantages. That's why, it is called as a necessary evil.

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MCQ 191 Mark

Assertion (A) Force of friction is smaller in smooth surfaces than rough surface.
Reason (R) Static friction is greater than the sliding friction.

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false.
D
A is false but R is true.

Answer

B. Force of friction is smaller on smooth surfaces than rough surfaces because on smooth surfaces, the irregularities present are very less as compare to rough surface.

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MCQ 201 Mark

The fishes swim easily in the water because they have

A
more energy
✓
streamlined shape
C
Both (a) and (b)
D
None of these

Answer

Correct option: B.

streamlined shape

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MCQ 211 Mark

Treads are made in the tyres to

✓
increase friction
B
decrease friction
C
speed up the vehicle
D
speed down the vehicle

Answer

Correct option: A.

increase friction

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MCQ 221 Mark

Fine powder is poured on the carromboard to

A
increase friction
✓
decrease friction
C
Both (a) and (b)
D
None of these

Answer

Correct option: B.

decrease friction

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MCQ 231 Mark

We can Increase the friction by

A
polishing
✓
making grooves and treads
C
streamlining
D
using ball bearing

Answer

Correct option: B.

making grooves and treads

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MCQ 241 Mark

A student wants to move a heavy block from one place to another. What method the student should apply to reduce the effort?

A
Pull the block using a rope
✓
Place wheels under the block
C
Slide the block along the surface
D
Apply oil to the bottom of the block

Answer

Correct option: B.

Place wheels under the block

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MCQ 251 Mark

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

A
increased
✓
reduced
C
same
D
None of these

Answer

Correct option: B.

reduced

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MCQ 261 Mark

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

A
muddy surface
✓
polished marble surface
C
cemented surface
D
brick surface

Answer

Correct option: B.

polished marble surface

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MCQ 271 Mark

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

✓
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

Answer

Correct option: A.

wet marble floor, dry marble floor, newspaper, towel

(A) wet marble floor, dry marble floor, newspaper, towel
The correct arrangement is as follows:
Wet marble floor, dry marble floor, newspaper, towel.

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MCQ 281 Mark

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
✓
Static, sliding, rolling
D
Sliding, static, rolling

Answer

Correct option: C.

Static, sliding, rolling

(C) Static, sliding, rolling
We know that the static friction is more powerful than all other frictions. Hence, it will take first place in decreasing order. Similarly, sliding friction is smaller than static friction but greater than rolling friction. Thus, the decreasing order of the forces due to these frictions is as follows
Static > Sliding > Rolling

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