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 )
