We have compiled the NCERT MCQ Questions for Class 8 Science Chapter 12 Friction with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Science with Answers on a daily basis and score well in exams. Refer to the Friction Class 8 MCQs Questions with Answers here along with a detailed explanation.
Friction Class 8 MCQs Questions with Answers
Choose the correct option.
Question 1.
Friction is a
(a) non-contact force
(b) contact force
(c) magnetic force
(d) electrostatic force
Answer
Answer: (b) contact force
Question 2.
Which of the following produces least friction?
(a) Sliding friction
(b) Rolling friction
(c) Composite friction
(d) Static friction
Answer
Answer: (b) Rolling friction
Question 3.
Friction always
(a) opposes the motion
(b) helps the motion
(c) both (a) and (b)
(d) none of these
Answer
Answer: (a) opposes the motion
Question 4.
Friction can be reduced by using
(a) oil
(b) grease
(c) powder
(d) all of these
Answer
Answer: (a) oil
Question 5.
Static friction is less than
(a) sliding friction
(b) rolling friction
(c) both (a) and (b)
(d) none of these
Answer
Answer: (d) None of these
Question 6.
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.
Answer
Answer: (d) irrespective of whether the objects are solid, liquid or gaseous.
Question 7.
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
Answer
Answer: (a) Stone
Question 8.
The shape of an aeroplane is like a
(a) dog
(b) bird
(c) car
(d) all of these
Answer
Answer: (b) bird
Question 9.
Friction is
(a) foe
(b) friend
(c) both (a) and (b)
(d) none of these
Answer
Answer: (c) both (a) and (b)
Question 10.
Friction due to fluids is called
(a) force
(b) pressure
(c) friction
(d) drag
Answer
Answer: (d) drag
Question 11.
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
Answer
Answer: (b) Surface of tyres
Question 12.
A toy car released with the same initial speed will travel farthest on
(a) muddy surface
(b) polished marble surface
Cc) cemented surface
(d) brick surface
Answer
Answer: (b) polished marble surface
Question 13.
If we apply oil on door hinges, the friction will
(a) increase
(b) decrease
(c) disappear altogether
(d) will remain unchanged
Answer
Answer: (b) decrease
Question 14.
Lubricant
(a) reduce friction
(b) increase friction
(c) both (a) and (b)
(d) none of these
Answer
Answer: (a) reduce friction
Question 15.
Force of friction depends on
(a) roughness of surface
(b) smoothness of surface
(c) inclination of surface
(d) all of these
Answer
Answer: (d) all of these
Question 16.
Force of friction depends on
(a) roughness of surface
(b) weight
(c) size
(d) all of these
Answer
Answer: (d) all of these
Question 17.
Fluids are
(a) liquids
(b) gases
(c) both (a) and (b)
(d) none of these
Answer
Answer: (c) both (a) and (b)
Question 18.
Which is a streamlined object?
(a) Boats
(b) Aeroplanes
(c) Ships
(d) All of these
Answer
Answer: (d) All of these
Question 19.
Smooth surface has
(a) less friction
(b) more friction
(c) sometimes less and sometimes more
(d) all of these
Answer
Answer: (a) less friction
Question 20.
Which of the following is responsible for wearing out of bicycle tyres?
(a) Muscular force
(b) Magnetic force
(c) Frictional force
(d) Electrostatic force
Answer
Answer: (c) Frictional force
Question 21.
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
Answer
Answer: (b) For reducing friction
Question 22.
Which of the following surfaces will offer the least friction?
(a) Vinyl floor
(b) Plywood
(c) Plastic
(d) Ice
Answer
Answer: (d) Ice
Question 23.
Least amount of friction is required in which of the following sports?
(a) Car race
(b) Football
(c) Ice skating
(d) Tug of war
Answer
Answer: (c) Ice skating
Question 24.
Rolling friction is smaller than
(a) sliding friction
(b) static friction
(c) both (a) and (b)
(d) none of these
Answer
Answer: (c) both (a) and (b)
Question 25.
The force of friction acts in a direction to the direction of motion of the object.
(a) same
(b) opposite
(c) perpendicular
(d) downwards
Answer
Answer: (b) opposite
Question 26.
The force of friction depends upon
(a) nature of surfaces in contact
(b) pressure between the two surfaces
(c) both (a) and (b)
(d) none of the above
Answer
Answer: (c) both (a) and (b)
Question 27.
When the two surfaces in contact have a very thin layer of lubricant between them, it is known as
(a) solid friction
(b) rolling friction
(c) greasy friction
(d) film friction
Answer
Answer: (c) greasy friction
Question 28.
Why is it harder to move a heavy box at rest across the floor than to keep it sliding?
(a) Because static friction is greater
(b) Because kinetic friction is greater
(c) Because sliding friction is greater
(d) None of these
Answer
Answer: (a) Because static friction is greater
Question 29.
Friction can be reduced by
(a) polishing
(b) oiling
(c) use of ball bearings
(d) all of these
Answer
Answer: (d) all of these
Question 30.
Which of the following are fluids?
(a) Gases
(b) Liquids
(c) Both gases and liquids
(d) None of these
Answer
Answer: (c) Both gases and liquids
Question 31.
Friction is a
(a) contact force
(b) non-contact force
(c) magnetic force
(d) none of these
Answer
Answer: (a) contact force
Question 32.
The maximum value of static friction that comes into play when a body is just at the point of sliding over the surface of another body is called
(a) limiting friction
(b) rolling friction
(c) sliding friction
(d) all of these
Answer
Answer: (a) limiting friction
Question 33.
What is the most common way to reduce friction?
(a) Lubrication
(b) Warning signs
(c) Eliminating the motion
(d) None of these
Answer
Answer: (a) Lubrication
Question 34.
Burning of meteor in the atmosphere is due to
(a) electrostatic force
(b) magnetic force
(c) frictional force
(d) gravitational force
Answer
Answer: (c) frictional force
Question 35.
When an object moves through a liquid, it experiences
(a) static friction
(b) sliding friction
(c) fluid friction
(d) rolling friction
Answer
Answer: (c) fluid friction
Fill in the Blanks
Question 1.
Sliding friction is ____________ than static friction.
Answer
Answer: Less
Question 2.
Friction can be reduced by using ___________
Answer
Answer: oil or powder or grease
Question 3.
Friction can be increased by making surface ___________
Answer
Answer: rough
Question 4.
Rolling friction is ___________ than sliding and static friction.
Answer
Answer: less
Question 5.
Friction due to fluid is also called ___________
Answer
Answer: drag
Question 6.
Bodies of birds, fishes and ships are ___________
Answer
Answer: streamlined
Question 7.
Friction can also produce ___________
Answer
Answer: heat
Question 8.
All objects moving in fluids have __________ shape to reduce ___________
Answer
Answer: streamlined, friction
Question 9.
Rough surfaces produce __________ friction than smooth surfaces.
Answer
Answer: more
Question 10.
In many machines, friction is reduced by using ___________
Answer
Answer: ball bearing
Question 11.
Friction depends on the __________ of substances in contact.
Answer
Answer: nature
Question 12.
Static friction comes into play when we try to move an object at ___________
Answer
Answer: rest
Question 13.
__________ force is responsible for downward movement of a parachutist when he jumps from an air craft.
Answer
Answer: Gravitational
Question 14.
The sole of shoes and the tyres of vehicles are treaded to ___________ friction.
Answer
Answer: increase
Question 15.
Friction is sometimes ___________
Answer
Answer: undesirable
Question 16.
The force of friction always opposes the ……………………. force.
Answer
Answer: applied
Question 17.
Water and other liquids exert ……………………. when objects move through them.
Answer
Answer: force of friction
Question 18.
Shapes that are designed to reduce air resistance are called ……………………. shapes.
Answer
Answer: streamlined
Question 19.
Rolling friction is ……………………. than sliding friction.
Answer
Answer: less
Question 20.
Graphite acts as a ……………………. in machinery.
Answer
Answer: lubricant
Question 21.
Friction can be increased by making a surface …………………….
Answer
Answer: rough
True or False
Question 1.
Friction is always useful to us.
Answer
Answer: False
Question 2.
Fluids are only liquids.
Answer
Answer: False
Question 3.
Friction is less for smooth surfaces.
Answer
Answer: True
Question 4.
A soapy floor is slippery due to increased friction.
Answer
Answer: False
Question 5.
Friction always works in opposite direction to the relative motion.
Answer
Answer: True
Question 6.
Friction is dependent on area of contact.
Answer
Answer: False
Question 7.
Sliding friction is less than rolling friction.
Answer
Answer: False
Question 8.
Friction decreases with increase in the smoothness of the surface.
Answer
Answer: True
Question 9.
It is easier to move a heavy object than a light object.
Answer
Answer: False
Question 10.
Friction can be reduced by using lubricants.
Answer
Answer: True
Question 11.
Friction is independent of the nature of surfaces in contact.
Answer
Answer: False
Question 12.
A spring balance measures force.
Answer
Answer: True
Question 13.
Friction can be reduced by using ball bearings in some machines.
Answer
Answer: True
Question 14.
Friction can never be eliminated.
Answer
Answer: True
Question 15.
Friction do not produce heat.
Answer
Answer: False
Question 16.
Rolling increases friction.
Answer
Answer: False
Question 17.
Friction is due to the roughness of the two surfaces in contact.
Answer
Answer: True
Question 18.
Rolling friction is lesser than the static friction.
Answer
Answer: True
Question 19.
Sliding friction is always less than static friction.
Answer
Answer: True
Question 20.
Fluids are only liquids in nature.
Answer
Answer: False
Question 21.
Soapy floor is slippery due to increased friction.
Answer
Answer: False
Question 22.
Smooth surface has less frictional force.
Answer
Answer: True
Question 23.
Streamlined shape of objects reduces friction.
Answer
Answer: True
Question 24.
Friction is always harmful for us.
Answer
Answer: False
Question 25.
Friction increases with increase in the pressure between the two surfaces in contact.
Answer
Answer: True
Match the following
| Column I | Column II |
| 1. Fluid friction | (a) Due to friction |
| 2. Lubricants | (b) Streamlined |
| 3. Wheels | (c) Increases friction |
| 4. Spring balance | (d) Drag |
| 5. Shape of aeroplane | (e) Rolling friction |
| 6. Rough surface force | (f) Reduce friction |
| 7. Heat generation | (g) Measures force |
Answer
Answer:
| Column I | Column II |
| 1. Fluid friction | (d) Drag |
| 2. Lubricants | (f) Reduce friction |
| 3. Wheels | (e) Rolling friction |
| 4. Spring balance | (g) Measures force |
| 5. Shape of aeroplane | (b) Streamlined |
| 6. Rough surface force | (c) Increases friction |
| 7. Heat generation | (a) Due to friction |
| Column A | Column B |
| 1. Lubricant | (a) Ceiling fan |
| 2. Friction produces | (b) Measures force |
| 3. Wheels | (c) Reduce friction |
| 4. Spring balance | (d) Rolling friction |
| 5. Ball bearings | (e) Heat |
Answer
Answer:
| Column A | Column B |
| 1. Lubricant | (c) Reduce friction |
| 2. Friction produces | (e) Heat |
| 3. Wheels | (d) Rolling friction |
| 4. Spring balance | (b) Measures force |
| 5. Ball bearings | (a) Ceiling fan |
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