## Class 8 Science Objective Chapter – 12 Friction

Here we are providing Class 8 Science Objective Chapter – 12 Friction because its very important for Class 8 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 8 Science Objective Chapter – 12 Friction is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 8 Science Objective Chapter – 12 Friction Wastewater Story 100+ questions  so that students practice more and more. If you want class wise Notes Then Click Here

## Class 8 Science Objective Chapter – 12 Friction

1.The hinges of creaking doors are oiled to:

( A ) keep them clean

( B ) open and close them easily

( C  ) reduce noise and wears and tear

( D  ) none of these

Ans – ( D )

2. Which of the following produces least friction?

( A ) Sliding friction

( B ) Rolling friction

( C  ) Composite friction

( D  ) Static friction

Ans – ( B )

3. Which of the following surfaces will offer the least friction?

( A ) Vinyl floor

( B ) Plywood

( C  ) Plastic

( D  ) Ice

Ans – ( D )

4.A matchstick catches fire when struck against the side of the matchbox because:

( A ) of the chemicals

(b ) of friction

( C  ) friction produces a spark and the

( D  ) none of these chemicals catches fire

Ans – ( C )

5. Which of the following is true about friction:

( A ) Friction can only slow things down

( B ) Friction is a force that only occurs when an object moves

( C  ) Friction is a force that only occurs on rough surfaces

( D  ) Friction is a force that occurs only between solids

Ans – ( B )

6. Least amount of friction is required in which of the following sports?

( A ) Car race

( B ) Football

( C  ) Ice skating

( D  ) Tug of war

Ans – ( C )

7.The frictional force of smooth surface is:

( A ) less

( B ) more

( C  ) zero

( D  ) none of these

Ans – ( A  )

8. Rolling friction is smaller than

( A ) sliding friction

( B ) static friction

( C  ) both ( A ) and (b)

( D  ) none of these

Ans – ( C )

9.This type of friction is the most powerful of all types of frictions:

( A ) static

( B ) rolling

( C  ) sliding

( D  ) drag

Ans – ( A )

10. Which of the following is true about friction:

( A ) Friction can only slow things down

( B ) Friction is a force that only occurs when an object moves

( C  ) Friction is a force that only occurs on rough surfaces

( D  ) Friction is a force that occurs only between solids

Ans – ( B )

11.When two objectives are already moving the friction between them is called:

( A ) rolling friction

( B ) static friction

( C  ) sliding friction

( D  ) friction of fluid

Ans – ( C )

12. Friction always

( A ) opposes the motion

( B ) helps the motion

( C  ) both ( A ) and (b)

( D  ) none of these

Ans – ( A )

13.Ball-bearings are used to convert static friction into:

( A ) drag

( B ) sliding friction

( C  ) rolling friction

( D  ) none of these

Ans – ( C )

14. Talcum powder should not be spilled on the floor of room because:

( A ) it will stain the floor

( B ) it may cause us to slip and fall

( C  ) it is messy

( D  ) none of these

Ans – ( B )

15.To convert the static, sliding friction into rolling friction, the heavy luggage carriers are attached with at their base.

( A ) ball-bearings

( B ) chains

( C  ) tyres

( D  ) wheels

Ans – ( D )

16. Friction can be reduced by using

( A ) oil

( B ) grease

( C  ) powder

( D  ) all of these

Ans – ( D )

17.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

Ans – ( C )

18. The easiest way to move a heavy wooden crate is to:

( A ) place it on a trolley

( B ) tie a rope one end and pull

( C  ) push it

( D  ) none of these

Ans – ( A )

19.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:

( A ) wet marble floor, dry marble floor, newspaper and 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

Ans – ( B )

20. Static friction is less than

( A ) sliding friction

( B ) rolling friction

( C  ) both ( A ) and (b)

( D  ) none of these

Ans – ( D )

21.The force of friction between two bodies is:

( A ) parallel to the contact surface

( B ) inclined at 30° to the contact surface

( C  ) perpendicular to the contact surface

( D  ) inclined at 60° to the contact surface

Ans – ( A )

22. The two common forces that are acting everywhere around us are:

( A ) gravity and friction

( B ) gravity and magnetic force

( C  ) electrostatic force and gravity

( D  ) friction and magnetic force

Ans – ( A )

23.A coin pushed on a table stops because:

( A ) no force acts on it

( B ) it is very heavy

( C  ) the table exerts a frictional force on it

( D  ) the earth attracts it

Ans – ( A )

24. 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.

Ans – ( D )

25.The main cause of wear and tear of machine is:

( A ) poor quality of machine

( B ) friction acting between different moving parts

( C  ) gravitational force of earth

( D  ) none of these

Ans – ( B )

26. If we apply the force along the right, the friction acts along the:

( A ) right direction

( B ) left direction

( C  ) can’t say

( D  ) none of these

Ans – ( B )

27.Ball rolling on the floor stops due to:

( A ) muscular force

( B ) gravitational force

( C  ) magnetic force

( D  ) frictional force

Ans – ( D )

28. 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

Ans – ( D )

29.Which of the following produces least friction?

( A ) Sliding friction

( B ) Rolling friction

( C  ) Composite friction

( D  ) Static friction

Ans – ( B  )

30. Which of the following is true:

( A ) We write on a paper with pen due to friction

( B ) A nail is fixed in the wall due to friction

( C  ) Soles of shoes wear out due of friction

( D  ) All of these

Ans – ( D )

31.Which of the following is not a smooth surface?

( A ) Surface of wet soap

( B ) Surface of tyres

( C  ) Glazed tiles

( D  ) Surface of mirror

Ans – ( D )

32. The shape of an aeroplane is like a

( A ) dog

( B ) bird

( C  ) car

( D  ) all of these

Ans – ( B )

33.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

Ans – ( B )

34. Gymnasts apply some coarse substance on their hands to:

( A ) increase friction for better grip

( B ) decrease friction

( C  ) play fast

( D  ) none of these

Ans – ( A )

35.If we apply oil on door hinges, the friction will

( A ) increase

( B ) decrease

( C  ) disappear altogether

( D  ) will remain unchanged

Ans – ( B )

36. Friction is

( A ) foe

( B ) friend

( C  ) both ( A ) and (b)

( D  ) none of these

Ans – ( C )

37.Lubricant

( A ) reduce friction

( B ) increase friction

( C  ) both ( A ) and (b)

( D  ) none of these

Ans – ( A )

38. In which of the following friction is troublesome:

( A ) sharpening a knife by rubbing it against a stone

( B ) applying the brekes to stop a cycle.

( C  ) walking on a wet road

( D  ) rubbing the matchstick with the side of matchbox before burning it

Ans – ( C )

39.Force of friction depends on

( A ) roughness of surface

( B ) smoothness of surface

( C  ) inclination of surface

( D  ) all of these

Ans – ( D )

40. Friction due to fluids is called

( A ) force

( B ) pressure

( C  ) friction

( D  ) drag

Ans – ( D )

41.Fluids are

( A ) liquids

( B ) gases

( C  ) both ( A ) and (b)

( D  ) none of these

Ans – ( C )

42. Mobil oil is used in scooters and bikes for which purpose?

( A ) As fuel

( B ) For reducing friction

( C  ) For increasing friction

( D  ) None of the above

Ans – ( B )