NCERT MCQ Questions for Class 8 Science Chapter 12 Friction with Answers
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MCQ Questions for Class 8 Science Chapter 12 Friction with Answers
Choose the correct option from the following:
Question 1. Give example of a contact force
(i) gravitational force
(ii) electrostatic force
(iii) frictional force
(iv) none of the above
Answer: (iii) frictional force
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Question 2. Which has less friction
(i) sliding friction
(ii) rolling friction
(iii) static friction
(iv) none of the above
Answer: (ii) rolling friction
Question 3. Direction of frictional force is
(i) in the same direction of motion
(ii) in the perpendicular direction of motion
(iii) in the opposite direction of motion
(iv) none of the above
Answer: (iii) in the opposite direction of motion
Question 4. Friction can be reduced by
(i) make the surface smooth
(ii) make the surface rough
(iii) cutting grooves
(iv) none of the above
Answer: (i) make the surface smooth
Question 5. Tyres of racing cars are smooth
(i) to enhance speed
(ii) to reduce friction
(iii) to increase friction
(iv) none of the above
Answer: (ii) to reduce friction
Question 6. When we oils the hinges of the door, it will
(i) increase the friction
(ii) fiction remains same
(iii) reduce the friction
(iv) none of the above
Answer: (iii) reduce the friction
Question 7. When we robbed a matchstick against the the side of a Matchbox, the matchstick catches fire because of
(i) frictional force
(ii) chemical reaction
(iii) electrostatic force
(iv) none of the above
Answer: (i) frictional force
Question 8. Among the following which statement is true for frictional force
(i) frictional force only occurred at the rough surface
(ii) frictional force increase the speed of a moving object
(iii) frictional force only occurred between the two solid objects
(iv) frictional force occurred when the objects start moving
Answer: (iv) frictional force occurred when the objects start moving
Question 9. Friction is
(i) always a disadvantage
(ii) always an advantage
(iii) sometimes a disadvantage and sometimes an advantage
(iv) neither a disadvantage nor an advantage
Answer: (iii) sometimes a disadvantage and sometimes and advantage
MCQ Questions for Class 8 Science Chapter 12 Friction with Answers
Question 10. It is difficult to walk on a smooth and polished floor because
(i) pressure is high
(ii) force is low
(iii) friction is high
(iv) friction is low
Answer: (iii) friction is high
Question 11. Friction also produce
(i) heat
(ii) light
(iii) pressure
(iv) none of the above
Answer: (i) heat
Question 12. Sliding friction is less than
(i) rolling friction
(ii) static friction
(iii) rolling friction as well as static friction
(iv) none of these
Answer: (ii) static friction
Question 13. Ball bearing is a device which generally converts
(i) rolling friction into static friction
(ii) static friction into sliding friction
(iii) sliding friction into rolling friction
(iv) rolling friction into sliding friction
Answer: (iii) sliding friction into rolling friction
Question 14. The frictional force which is exerted by a liquid is called
(i) brag
(ii) drag
(iii) drab
(iv) tread
Answer: (ii) drag
Question 15. The shape of a Boat is streamlined shape this is because
(i) to increase drag
(ii) to decrease drag
(iii) to fixed the value of drag
(iv) none of the above
Answer: (ii) to decrease drag
Question 16. To sharp a knife, it is better to rubbed it with a stone having rough surface, because
(i) frictional force applied by that stone is more
(ii) frictional force applied by that stone is lesser
(iii) the stone does not have any frictional force
(iv) none of the above
Answer: (i) frictional force applied by that stone is more
Question 17. Which has streamlined shape
(i) dog
(ii) cow
(iii) cat
(iv) bird
Answer: (iv) bird
Question 18. Friction is
(i) friend
(ii) foe
(iii) friend as well as foe
(iv) none of the above
Answer: (iii)friend as well as foe
Question 19. Example of a smooth surface is surface of
(i) wood
(ii) wall
(iii) brick
(iv) mirror
Answer: (iv) mirror
Question 19. Among the following which is not reduce the friction
(i) oil
(ii) powder
(iii) lubricant
(iv) sand
Answer: (iv) sand
MCQ Questions for Class 8 Science Chapter 12 Friction with Answers
Question 20. Measure of friction depends upon
(i) nature of surface
(ii) size of surface
(iii)shape of surface
(iv) weight of surface
Answer: (i) nature of surface
Question 21. When the shape is streamlined shape then the frictional force or drag applied by liquid is
(i) more
(ii) less
(iii) has no effect
(iv) none of the above
Answer: (ii) less
Question 22. Which of the following is the cause of wear and tears of the the tyres of a car
(i) gravitational force
(ii) magnetic force
(iii) frictional force
(iv) electrostatic force
Answer: (iii) frictional force
Question 23. To reduce friction, which can be used as lubricant in machines
(i) sodium
(ii) paint
(iii) water
(iv) graphite
Answer: (iv) graphite
Question 24. When one body just tends to move or or slip over the surface of another body, the friction applied is called
(i) static friction
(ii) dynamic friction
(iii) sliding friction
(iv) rolling friction
Answer: (iii) sliding friction
Question 25. An example of application of friction is
(i) is lightening of matchstick
(ii) wapking
(iii) Spikes in the shoes of players for running
(iv) all of the above
Answer: (iv) all of the above
Question 26. Friction is proteins due to
(i) high pressure between two objects
(ii) interlocking of two surfaces
(iii) force applied by the two surfaces
(iv) none of the above
Answer: (ii) interlocking of two surfaces
Question 27. It is difficult to walk on watery floor, because
(i) it has greater friction
(ii) it has lesser fiction
(iii) apply greater opposing force
(iv) none of the above
Answer: (ii) it has lesser friction
Question 28. Tyres have treads because
(i) to increase friction
(ii) to decrease friction
(iii) to remain same the friction
(iv) none of the above
Answer: (i) to increase friction
Question 29. Rolling friction is
(i) lesser than sliding friction
(ii) lesser than static friction
(iii) lesser than sliding friction as well as static friction
(iv) none of the above
Answer: (iii) lesser than sliding friction as well as static friction
Question 30. The correct increasing order of these fractions are
(i) sliding friction, static friction, rolling friction
(ii) static friction, rolling friction, sliding friction
(iii) rolling friction, sliding friction, static friction
(iv) none of the above
Answer: (iii) rolling friction, sliding friction, static friction
MCQ Questions for Class 8 Science Chapter 12 Friction with Answers
Question 31. The wearing out of the sole of the shoe because
(i) sole of the shoe is bad quality
(ii) high pressure on the sole of the shoe
(iii) the friction which is produced between sole of the shoe and the surface of the road
(iv) none of the above
Answer: (iii) the friction which is produced between sole of the shoe and the surface of the road
Question 32. It is easy to pull a trolley bag then push it, because
(i) rolling friction is lesser than sliding friction
(ii) rolling friction is greater than sliding
(iii) rolling friction is equal to sliding friction
(iv) none of the above
Answer: (i) rolling friction is lesser than sliding friction
Question 33. When an object moves in the the east direction then the friction will on the
(i) east direction
(ii) west direction
(iii) north direction
(iv) south direction
Answer: (ii) West direction
Question 34. Gymnast apply some coarse substances on their hand because
(i) to increase the friction and grip well
(ii) to reduce friction and grip well
(iii) to protect the hand from injury
(iv) none of the above
Answer: (i) to increase the friction and grip well
Question 35. Drag is
(i) frictional force applied by only solid
(ii) frictional force applied by only liquid
(iii) frictional force applied by only gas
(iv) frictional force applied by fluid
Answer: (iv) frictional force applied by fluid
Question 36. Friction always acts in the
(i) direction of motion
(ii) opposite direction of motion
(iii) perpendicular direction of motion
(iv) parallel direction of motion
Answer: (ii) opposite direction of motion
Question 37. A ball rolling along the ground stop after sometimes because
(i) gravitational force
(ii) frictional force
(iii) muscular force
(iv) none of the above
Answer: (ii) none of the above
Question 38. Kabaddi Players rub their hands with soil while playing because
(i) to increase the the frictional force and grip well
(ii) to decrease the frictional force and grip well
(iii) to remain same the frictional force and grip well
(iv) none of the above
Answer: (i) to increase the the frictional force and grip well
Question 39. Weight surface is more slippery because has
(i) more fiction
(ii) less friction
(iii) more pressure
(iv) none of the above
Answer: (ii) less friction
Question 40. Shapes that are designed to reduce your resistance is
(i) rectangular shape
(ii) square shape
(iii) triangular shape
(iv) streamlined shape
Answer: (iv) streamlined shape
MCQ Questions for Class 8 Science Chapter 12 Friction with Answers
Fill in the blanks:
(1)The force of friction always acts in the …… … … . . . . direction to the applied force.
Answer: the force of friction always acts in the opposite direction to the applied force.
(2).................comes into play when we try to move an object at rest.
Answer: Friction comes into play when we try to move an object at rest.
(3) …………….. comes into play when an object is sliding over another object.
Answer: Sliding friction comes into play when an object is sliding over another object.
(4) Sliding friction is always ………….. than static friction.
Answer: Sliding friction is always lesser than static friction.
(5) Friction can be ………….. by using lubricants.
Answer: Friction can be reduced by using lubricants.
(6) Friction is the force which ………….. the relative motion between two surfaces.
Answer: Friction is the force which opposes the relative motion between two surfaces.
(7) Friction can be increased by making a surface …………….
Answer: Friction can be increased by making a surface rough.
(8) The frictional force exerted by fluid is called ……………
Answer:The frictional force exerted by fluid is called drag.
(9) Ball bearings reduce friction, replacing sliding friction by………………
Answer: Ball bearings reduce friction, replacing sliding friction by rolling friction.
(10) The device used for measuring the force acting on an object is ……………..
Answer: The device used for measuring the force acting on an object is spring balance.
(11) A smooth surface has ………….. friction.
Answer: A smooth surface has less friction.
(12) The shape of an object which moves in a liquid is………….., to overcome the drag applied by the liquid
Answer: The shape of an object which moves in a liquid is streamlined, to overcome the drag applied by the liquid.
13. Grooves of tyres……………. the friction between road and tyres.
Answer: Grooves of tyres increases the friction between road and tyres.
14. Rolling friction is ………… than the sliding friction.
Answer: Rolling friction is lesser than the sliding friction.
15. Friction always acts in the……….... direction of motion.
Answer: Friction always acts in the opposite direction of motion.
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