Question

b) the d
c) the d
d) stati
Work
a) zer:
4.
5. The f
a) na
6. Vehi
a) st
7. Let
ond
a)
d) None of these
8. TE
be
a
9.
b) Using the lubricants
d) Make the engine more attractive
b) Decreaes with the weight of body
b) Perpendicular to the contact surface
d) Inclined at 60° to the contact surface.
Multiple choice questions :
Force of friction is
b) Always disadvantages
a) Always advantages
c) Some times advantages and some times disadvantages
d) Neither an advantages nor disadvantages
2. The use of lubricants.
b) Increases friction
a) Decreases friction
c) Make it stable
3. The force of friction
a) Increases with the weight of body
c) Is not affected by the weight of the body
4. The force of friction between two bodies is
a) Parallel to the contact surface
c) Inclined at 30° to the contact surface
5.
Friction can be reduced
a) Using ball bearings
c) By polishing the surfaces in contact
d) All the above
6. If the normal reaction is doubled, the coefficient of friction
a) Doubled
b) Halved
c) Not changed
d) Tripled
Oly
7. In the following forces of friction, the one which is self - adjusting is
a) Rolling friction
b) Sliding friction c) Static friction d) Dynamic friction
8.
Vehicles are streamlined to reduce
[
a) Static friction b) Kinetic friction c) Sliding friction d) Fluid friction
9. Ball bearings are used to
a) Convert static to dynamic friction
b) Convert limiting to dynamic friction
c) Convert sliding to rolling friction
d) Convert rolling to fluid friction
10. The limiting friction is
a) Equal to the dynamic friction
b) Always less than the dynamic friction
c) Always greater than the dynamic friction
d) Some times greater and some times equal to dynamic friction.
24
Varsity Education Mana- ment Pvt
[ 1.
2.
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Answer 1

Answer:

a

b

c

b

d

c

a

a

b

b

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