Friction Test

Result

Friction Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

If we apply oil on door hinges, the friction will:

A
increase

B
decrease

C
disappear altogether

D
will remain unchanged

Solution

Lubrication always decreases friction between two surfaces. Hence putting oil will decrease friction.
Question 2
1 / -0

The opposing force that is caused due to relative motion between two surfaces in contact is called ....................... .

A
Frictional force

B
Electrostatic force

C
Magnetic force

D
Gravitational force

Solution

Friction is caused due to relative motion between two different objects. It is a force between two surfaces that are sliding, or trying to slide, across each other. It always works in the direction opposite to the direction in which the object is moving, or trying to move.
Question 3
1 / -0

When a boy tries to push a heavy box placed on a rough surface, the box does not move because of an opposing force called :

A
friction

B
normal force

C
rigid force

D
uniform force

Solution

The force of friction opposes the relative motion between the heavy box and rough surface.
Question 4
1 / -0

Which of the following is used to reduce friction in a rotating machine?

A
wheels

B
rollers

C
ball bearing

D
polishing

Solution

Ball bearing are used in rotating machine parts to reduce rolling friction.

Option C is correct.
Question 5
1 / -0

In which of the following cases more friction is desirable?

A
Movement of piston in a cylinder

B
Braking of a vehicle

C
Skating on a track

D
All of the above

Solution

Friction is desirable in braking of a vehicle. As brakes are applied, friction between brake shoes and tyres opposes rotation of tyres and hence, forces it to stop.
Question 6
1 / -0

Which of the following material is likely to have least friction?

A
wood

B
plastic

C
glass

D
paper

Solution

Glass has comparatively a better polished and regular smooth surface. So it has least friction.
Question 7
1 / -0

A coin flicked across a table will stop, because:

A
It is heavy

B
No force is acting on it

C
Earth attracts the coin

D
Table exerts a frictional force

Solution

The table exerts a frictional force on the coin in the reverse direction and thus, the coin stops across the table. The force of friction always opposes the applied force.
Question 8
1 / -0

Powder is used in carrom board for:

A
Increasing friction

B
Decreasing friction

C
Decoration

D
None of the above

Solution

Powder is used to increase smoothness of the board. It fills the irregularities and makes the surface smoother. This decreases the friction to play well.

Option B is correct.
Question 9
1 / -0

The surface of a table is smoother as compared to that of a road. This is due to:

A
Irregularities in the surface of road

B
Polishing of the table

C
Both $$A$$ and $$B$$

D
None of these

Solution

Friction is caused by the irregularities on the two surfaces in contact. Irregularities on the two surfaces lock into one another. When we attempt to move any surface, we have to apply a force to overcome interlocking. On rough surfaces, there are a larger number of irregularities.
The surface of the table is smoother as compared to that of a road.
Question 10
1 / -0

Any substance which is used to reduce the roughness of a surface is called a:

A
Lubricant

B
Lubrant

C
Lubrication

D
None of these

Solution

Lubricants reduce the roughness of a surface and make them smooth.
More common lubricants are Oil, Powder etc.

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Re-Attempt Weekly Quiz Competition

Friction Test - 13

Result

Friction Test - 13

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SHARING IS CARING

Question 1

increase

decrease

disappear altogether

will remain unchanged

Solution

Question 2

Frictional force

Electrostatic force

Magnetic force

Gravitational force

Solution

Question 3

friction

normal force

rigid force

uniform force

Solution

Question 4

wheels

rollers

ball bearing

polishing

Solution

Question 5

Movement of piston in a cylinder

Braking of a vehicle

Skating on a track

All of the above

Solution

Question 6

wood

plastic

glass

paper

Solution

Question 7

It is heavy

No force is acting on it

Earth attracts the coin

Table exerts a frictional force

Solution

Question 8

Increasing friction

Decreasing friction

Decoration

None of the above

Solution

Question 9

Irregularities in the surface of road

Polishing of the table

Both $$A$$ and $$B$$

None of these

Solution

Question 10

Lubricant

Lubrant

Lubrication

None of these

Solution

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