Friction Questions | Friction Objective Type Questions & Answers

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Questions
21 What kind of substances are known as lubricants
A Increase friction
B Decrease friction
C Increase or decrease friction
D None of these

Answer: Decrease friction
22 Friction is a __________
A Contact force
B Non-contact force
C Magnetic force
D None of these

Answer: Contact force
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23 Complete the sentence. Friction always ____________
A helps the motion
B opposes the motion
C both of these
D none of these

Answer: opposes the motion
24 On what force of friction depends?
A Smoothness of surface
B Roughness of surface
C Inclination of surface
D All of above

Answer: All of above
25 Lubricants ________
A Increase friction
B Reduce friction
C Both (a) and (b)
D All of the above

Answer: Reduce friction
26 The force of friction acts in a direction _____ to the direction of motion of object.
A Same
B Opposite
C Perpendicular
D Downwards

Answer: Opposite
27 The coefficient of static friction is
A Less than the coefficient of kinetic friction
B Greater than the coefficient of limiting friction
C Equal to coefficient of kinetic friction
D Equal to the tangent of the angle of friction

Answer: Equal to the tangent of the angle of friction
28 Which of the following kinetic friction is smaller?
A Limiting friction
B Static friction
C Rolling friction
D Sliding friction

Answer: Rolling friction
29 A mass of 4kg rests on a horizontal plane. The plane is gradually inclined until at an angle θ= 15° with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block and the surface?
A 0.814
B 0.27
C 1.5
D 3.5

Answer: 0.27
30 How is friction due to air reduced?
A Streamlining
B Lubrication
C By using ball bearings
D By polishing

Answer: Streamlining
31 The ratio of the limiting force of friction (F) to the normal reaction (R) is known as
A Coefficient of friction
B Force of friction
C Angle of friction
D None of the above

Answer: Coefficient of friction
32 The force of friction (F) is equal to
A µR/2
B µR
C 2µR
D µR/3

Answer: µR
33 When the two surfaces in contact have a thick layer of lubricant in between them, it is known as
A Solid friction
B Rolling friction
C Greasy friction
D Film friction

Answer: Both ‘a’ and ‘b’
34 The force of friction is maximum when the surface
A Is on the point of motion
B Is at rest
C Is moving
D The friction remains same at all points

Answer: Is on the point of motion
35 The types of threads used in Screw jacks are
A Metric thread
B Square
C ACME
D Buttress

Answer: Square
36 The slope of the thread with horizontal is known as
A helix
B lead
C pitch
D helix angle

Answer: helix angle
37 The clutch is placed in four-wheeler, in between
A Engine and gear box
B Gear box and differential
C Propeller shaft and differential
D None of the above

Answer: Engine and gear box
38 In rotation of shaft, the power lost in friction is given by
A W x µ x V Watts
B W x µ x V Kilo-watts
C W x µ / V Watts
D W x µ / V Kilo-watts

Answer: W x µ x V Watts
39 Which of the following uses spikes in shoes?
A Lawyer
B Doctor
C Rugby player
D Painter

Answer: Rugby player
40 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 these

Answer: None of these

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