# Class 8 Science Chapter 12 MCQ

Class 8 Science Chapter 12 MCQ (Multiple Choice Questions) of Friction updated for academic session 2021-2022 CBSE and state board students free to use. All the contents are prepared from latest NCERT Textbooks issued for session 2021-22.

Every topic given in chapter 12 of class 8 science is covered in the format of MCQ quiz with suitable answers and explanation. Practice with these questions to score better in exams.

## Class 8 Science Chapter 12 MCQ for 2021-2022

 Class: 8 Science Chapter: 12 Friction Contents: MCQ Online Tests

### MCQ Tests with Answers for Class 8 Science Chapter 12

Q1

#### A boy runs his 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
Q2

#### 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.
Q3

#### Four children were asked to arrange forces due to rolling, static and sliding friction in a decreasing order. The correct arrangement is:

[A]. Rolling, Static, Sliding
[B]. Rolling, Sliding, Static
[C]. Static, Sliding, Rolling
[D]. Sliding, Static, Rolling
Q4

#### 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
Q5

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

[A]. [A] Increase
[B]. Decrease
[C]. Disappear Altogether
[D]. Will remain unchanged

Q6

#### The friction between two surfaces does not depend on one of the following. This one is:

[A]. Amount of surface area of the two objects which is in contact with each other
[B]. Weight of the object which tends to move on the surface of other object
[C]. Degree of smoothness of surfaces of two objects in contact with each other
[D]. Degree of roughness of surfaces of two objects in contact with each other
Q7

[A]. 5 N
[B]. 10 N
[C]. 4 N
[D]. 2 N
Q8

#### 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.
Q9

#### 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, 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]. Polished marble
[C]. Bricks
[D]. Gravel
Q10

[A]. 25 N
[B]. 20 N
[C]. 5 N
[D]. 50 N

Q11

[A]. 75N
[B]. 45N
[C]. 55N
[D]. 65N
Q12

#### Which of the following statement is or are incorrect?

[A]. Friction can never be entirely eliminated.
[B]. Dolphins are streamlined body by nature to reduce friction with water.
[C]. The use of ball bearing makes the wheel roll smoothly over the axle.
[D]. None of the above.
Q13

#### Which of the following will produce the maximum friction?

[A]. Rubbing of sand paper on glazed paper
[B]. Rubbing of sand paper on glass table top
[C]. Rubbing of sand paper on aluminium frame
[D]. Rubbing of sand paper on sand paper
Q14

#### Consider the following statements and choose the correct one:

[A]. Friction can be reduced by making the surfaces smooth by polishing.
[B]. Friction can be reduced by applying lubricants to the rubbing surfaces
[C]. Friction can be reduced by using wheel to move objects
[D]. All the above.
Q15

[A]. 5 m
[B]. 5.5 m
[C]. 4.8 m
[D]. 5.2 m

Q16

#### A book is lying on the horizontal table top. If we till the table, then the book starts sliding down slowly. This happens because:

[A]. Sliding friction is greater than static friction
[B]. Sliding friction is less than force of gravity
[C]. Static friction is greater than sliding friction
[D]. Force of gravity is less than sliding friction
Q17

#### In a science quiz competition, Payel is asked a question where she had to choose the statement which was/were incorrect?

[A]. The brakes of a car and bicycle work by friction.
[B]. The friction between brake pad and rim prevents the wheel from moving ahead.
[C]. If there were no friction, then once a vehicle started moving it would never stop.
[D]. None of the above
Q18

#### Consider the following statements and choose the incorrect one:

[A]. The burning of a matchstick would not be possible without friction.
[B]. We are able to cut wood because there is friction between the saw blade and log of wood.
[C]. We can hold a glass tumbler in our hands because of friction between the glass tumbler and our hands.
[D]. None of the above
Q19

#### In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

[A]. Nails and screws are also held in wood by friction.
[B]. Friction enables knot to be tied in strings or ropes etc.
[C]. Friction enables a person to climb a tree or pole.
[D]. Friction does not help a ladder to be leaned against the wall.
Q20

[A]. Aeroplane
[B]. Boat
[C]. Bird
[D]. Bus

Q21

#### A person has applied some mustard oil on his hands. Which of the following objects will become most difficult for him to hold in his hand?

[A]. Earthen cup (kulhar)
[B]. Thermocol tumbler
[C]. Glass tumbler
[D]. Wooden cup
Q22

#### Which of the statements is or are correct about “Friction”?

[A]. Friction force can only slow things down
[B]. Friction is force that only occurs when an object moves.
[C]. Friction is force that only occurs on rough surfaces.
[D]. Friction is force that only occurs between solids
Q23

#### Bikash is doing his homework which is given by his teacher. Would you help him to choose the correct sentences?

[A]. The pencil cell travels the least distance on the towel.
[B]. The pencil cell travels a larger distance on the wet marble floor.
[C]. The pencil cell travels less distance on the newspaper sheet then the dry marble floor.
[D]. All the above.
Q24

#### Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. The force of friction acts in the direction opposite to the direction of motion of an object.
[B]. When the motion of the book is towards right side then the force of friction acts on it towards the left side.
[C]. Friction is caused by the interlocking of irregularities in the surfaces of the two objects which are in contact with each other.
[D]. All the above
Q25

#### Ball bearing is a device which usually converts:

[A]. Rolling friction into sliding friction
[B]. Static friction into sliding friction
[C]. Sliding friction into rolling friction
[D]. Rolling friction into static friction

###### Why MCQs are important?

According to CBSE latest pattern of question papers, in every subject MCQ with four options will be asked. These MCQ help to revise the chapter as well as provide a perfect way for quick revision.