MULTIPLE CHOICE QUESTIONS ON FRICTION

Multiple Choice Questions (MCQ) on friction :-

The force of friction acts in a direction _____ to the direction of motion of object.

1. Same
2. Opposite
3. Perpendicular
4. Downwards

(Ans:b)

The force of friction depends upon

1. Nature of surface of contact
2. Material of objects in contact
3. Both ‘a’ and ‘b’
4. None of the above

(Ans:c)

The body will move only when

1. Force of friction = applied force
2. Force of friction < applied force
3. Force of friction > applied force
4. All of the above

(Ans:b)

The ratio of the limiting force of friction (F) to the normal reaction (R) is known as

1. Coefficient of friction
2. Force of friction
3. Angle of friction
4. None of the above

(Ans:a)

The coefficient of friction (µ) is equal to

1. TanΦ
2. SinΦ
3. CotΦ
4. CosΦ

Where Φ = angle of friction

(Ans:a)

The force of friction (F) is equal to

1. µR/2
2. µR
3. 2µR
4. µR/3

(Ans:b)

When the two surfaces in contact have a thick layer of lubricant in between them, it is known as

1. Solid friction
2. Rolling friction
3. Greasy friction
4. Film friction

(Ans:d)

When the two surfaces in contact have a very thin layer of lubricant in between them, it is known as

1. Solid friction
2. Rolling friction
3. Greasy friction
4. Film friction

(Ans:d)

The force of friction is maximum when the surface

1. Is on the point of motion
2. Is at rest
3. Is moving
4. The friction remains same at all points

(Ans:a)

The types of threads used in Screw jacks are

1. Metric thread
2. Square
3. ACME
4. Buttress

(Ans:b)

For a single started thread, the lead is equal to

1. p/2
2. p
3. 2p
4. p/3

Where p = pitch

(Ans:b)

The slope of the thread with horizontal is known as

1. helix
2. lead
3. pitch
4. helix angle

(Ans:d)