Multiple Choice Questions
1. When
swims across a flowing river, maximum energy is spent in
a) First 1/3
of the distance
b) Second 1/3 of the distance
c) Last 1/3
of the distance
d) Equal energy is spent throughout
2. The
maximum static friction is
a) Equal to
the dynamic friction
b) Always less than the dynamic friction
c) Always
greater than the dynamic friction
d) Sometimes greater and sometimes equal to dynamic
friction
3. If the
normal force is doubled, the coefficient of friction is
a) Not
changed
b) Halved
c) Doubled
d) Tripled
4. The
maximum static frictional force is
a) Equal to
twice the area of the surface in contact
b)
Independent of the area of surface in contact
c) Equal to
the area of surface in contact
d) None of the above
5. Which
of the following statements is not true
a) The
coefficient of friction between two surfaces will increase if the surface are
made rough
b) When a
body slides on a surface the force of friction acts opposite to the direction
of applied force
c) Rolling
friction is more than sliding friction
d) The
coefficient of friction between wood and wood is less than 1
6. Maximum
value of static friction is called
a) Limiting
friction
b) Rolling friction
c) Normal
friction
d) Coefficient of friction
7. The
limiting friction between two bodies in contact is independent of
a) Nature of
the surfaces in contact
b) The area of surfaces in contact
c) Normal
reaction between the surfaces
d) The materials of the bodies
8. The
constant ratio which the limiting friction bears with the normal reaction is
called
a) Angle of
friction
b) Cone of friction
c)
Coefficient of friction
d) None of the above
9.
Friction can be reduced by
a) Providing
lubricants
b) Ball bearings
c) Roller
bearings
d) Any of the above
10. The
frictional force which comes into play after the motion has commenced is called
a) Static
friction
b) Dynamic friction
c) Limiting
friction
d) None of the above
Answer