Friction Test

Result

Friction Test - 22

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

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.

Solution

To make the ball to roll over a longer distance, friction between the floor and the ball is to be reduced. Sprinkling talcum powder on the wooden floor will decrease the friction.
Question 2
1 / -0

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 solid, liquid or gaseous.

Solution

Friction occurs irrespective of state of the matter. Friction provided by liquids and gases are known as fluid friction.
Question 3
1 / -0

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.

Solution

Lesser the frictional force, farther the car will travel. Hence, polished surface provides the least frictional force.
Question 4
1 / -0

Two persons, pull each other through a massless rope in 'tug of war' game. Who will win ?

A
One whose weight is more.

B
One who pulls the rope with a greater force.

C
One who applies more friction force (shear force) on ground.

D
One who applies more normal force (compressive force) on ground

Solution
Question 5
1 / -0

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 road.

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

Solution

On a ball moving through air, friction of the air particles acts. This is commonly called air resistance.
Question 6
1 / -0

Which of the following helps to increase friction?

A
Only (i) and (ii)

B
Only (ii) and (iii)

C
Only (i) and (iii)

D
(i), (ii) and (iii)

Solution

Friction opposes the relative motion between two surfaces in contact. It acts on both surfaces. Friction depends on the nature of surfaces in contact. Friction can be increased by making a surface rough. Friction depends on how hard the two surfaces are pressed together. Therefore, friction can be increase by increasing the weight of objects.
Question 7
1 / -0

Which of the following powders is used as a lubricant to reduce friction in machines ?

A
Graphite

B
Chalk

C
Sand

D
Crushed stone

Solution

Graphite powder has high importance in industrial applications for self-lubricating and also dry lubricating characteristics. It has been believed that the lubricating properties of graphite are only due to the loose intermolecular bonding in it particles. So they don't stick to the surface, and help in making the two surfaces in contact more slippery, and thus reducing the friction.
Question 8
1 / -0

Why carrom board is usually powdered before playing?

A
For increasing friction.

B
For decreasing friction.

C
For decoration.

D
For fragrance.

Solution

Powder is made up of very fine particles.These fine particles when poured onto carrom board , they fill the microscopic grooves on the board and make the surface smooth due to which friction is reduced.
Hence powder is sprinkled on carrom board to reduce friction.
Question 9
1 / -0

Which of the following things will not happen in the world if friction were not present?

A
Dentist drilling your teeth.

B
Carpenter smoothening a wooden block.

C
Motion of cars on road.

D
All of the above

Solution

Carpenter smoothening a wooden block involves rubbing of wooden block with a rough sand paper and due to the friction between the sand paper and wooden block the upper surface of wood peel out and new smooth surface is seen.
Dentist drill holes in teeth by driller.The driller rotates the needle in tooth outer part and friction is generated between needle and tooth .And due to this rubbing the tooth upper layers shed out and inner part become visible.
A car also need friction on road to move because the friction from ground acting on wheels provides forward force required for motion of car.
Question 10
1 / -0

Assertion: Aeroplanes are given streamlining to increase the speed of vehicles.
Reason: Air friction decreases due to streamlining.

A
Both Assertion and Reason are true. Reason is the correct explanation of Assertion.

B
Both Assertion and Reason are true. Reason is not the correct explanation of Assertion.

C
Assertion is true and Reason is false.

D
Both Assertion and Reason are false.

Solution

When aeroplane moves through air, its motion is opposed by the air friction, which depends upon the shape of the body of aeroplane. Hence, the planes are given stream lined shape so that air friction is minimum. The movement of air on the upper and lower side of the streamlined shaped body provides a lift.

Hence, both the assertion and the reason are correct and Reason is the correct explanation of the Assertion.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Friction Test - 22

Result

Friction Test - 22

Score

-

Rank

-

SHARING IS CARING

Question 1

spread a carpet on the wooden surface.

cover the ball with a piece of cloth.

sprinkle talcum powder on the wooden surface.

sprinkle sand on the wooden surface.

Solution

Question 2

only if the objects are solid.

only if one of the two objects is liquid.

only if one of the two objects is gaseous.

irrespective of whether the objects are solid, liquid or gaseous.

Solution

Question 3

muddy surface.

polished marble surface.

cemented surface.

brick surface.

Solution

Question 4

One whose weight is more.

One who pulls the rope with a greater force.

One who applies more friction force (shear force) on ground.

One who applies more normal force (compressive force) on ground

Solution

Question 5

Friction acts on a ball rolling along the ground.

Friction acts on a boat moving on water.

Friction acts on a bicycle moving on a road.

Friction does not act on a ball moving through air.

Solution

Question 6

Only (i) and (ii)

Only (ii) and (iii)

Only (i) and (iii)

(i), (ii) and (iii)

Solution

Question 7

Graphite

Chalk

Sand

Crushed stone

Solution

Question 8

For increasing friction.

For decreasing friction.

For decoration.

For fragrance.

Solution

Question 9

Dentist drilling your teeth.

Carpenter smoothening a wooden block.

Motion of cars on road.

All of the above

Solution

Question 10

Both Assertion and Reason are true. Reason is the correct explanation of Assertion.

Both Assertion and Reason are true. Reason is not the correct explanation of Assertion.

Assertion is true and Reason is false.

Both Assertion and Reason are false.

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.