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Free download in PDF Friction Objective Type Questions & Answers for competitive exams. These Friction Objective Questions with Answers are important for Board Exams as well as competitive exams like IIT-JEE, AIIMS, NEET and other Pre-Medical and Engineering Exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(25)
Lubricants ________
[A]
Increase friction
[B]
Reduce friction
[C]
Both (a) and (b)
[D]
All of the above
(26)
The force of friction acts in a direction _____ to the direction of motion of object.
[A]
Same
[B]
Opposite
[C]
Perpendicular
[D]
Downwards
(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
(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
(30)
How is friction due to air reduced?
[A]
Streamlining
[B]
Lubrication
[C]
By using ball bearings
[D]
By polishing
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
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
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
36
The slope of the thread with horizontal is known as
[A]
helix
[B]
lead
[C]
pitch
[D]
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
39
Which of the following uses spikes in shoes?
[A]
Lawyer
[B]
Doctor
[C]
Rugby player
[D]
Painter
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
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