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Mechanical - UNIT - 7 - Friction - MCQ

1)   

Which of the following is an advantage of friction? 

A.
B.
C.
D.
Answer: C
2)   

Friction is directly proportional to ______. 

A.
B.
C.
D.
Answer: B
3)   

The unit of coefficient of friction is:

A.
B.
C.
D.
Answer: C
4)   

Which law states that friction is independent of the contact area? 

A.
B.
C.
D.
Answer: B
5)   

The angle of friction θ is related to coefficient of friction μ by:

A.
B.
C.
D.
Answer: A
6)   

Which of the following is used to reduce friction? 

A.
B.
C.
D.
Answer: B
7)   

Friction causes: 

A.
B.
C.
D.
Answer: C
8)   

What is the purpose of lubrication?

A.
B.
C.
D.
Answer: D
9)   

In which workshop application is friction helpful?

A.
B.
C.
D.
Answer: A
10)   

The ratio of limiting friction to normal force is: 

A.
B.
C.
D.
Answer: B
11)   

Which type of friction acts when an object just starts to move? 

A.
B.
C.
D.
Answer: C
12)   

Rolling friction is ______ than sliding friction.

A.
B.
C.
D.
Answer: C
13)   

Which of the following is used to measure friction? 

A.
B.
C.
D.
Answer: B
14)   

Kinetic friction occurs when:

A.
B.
C.
D.
Answer: C
15)   

What happens if there is no friction?

A.
B.
C.
D.
Answer: C
16)   

Which material produces high friction?

A.
B.
C.
D.
Answer: C
17)   

In workshops, friction is increased for which of the following? 

A.
B.
C.
D.
Answer: B
18)   

Which method is not used to reduce friction?

A.
B.
C.
D.
Answer: D
19)   

When the angle of inclination increases, the frictional force: 

A.
B.
C.
D.
Answer: A
20)   

Friction is necessary in which of the following machine parts?

A.
B.
C.
D.
Answer: B
21)   

A block weighs 200 N. If the coefficient of friction is 0.3, what is the limiting friction? 

A.
B.
C.
D.
Answer: C
22)   

If the angle of friction is 45°, the coefficient of friction is: 

A.
B.
C.
D.
Answer: B
23)   

Which is the correct relation? 

A.
B.
C.
D.
Answer: A
24)   

Which of the following reduces wear and increases efficiency? 

A.
B.
C.
D.
Answer: A
25)   

If a body is sliding on a surface, the friction is: 

A.
B.
C.
D.
Answer: C