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Physics 9 Chapter 3 - Dynamics - 23
1.
In which case it is easy for the tyre to roll over?
a) Rough ground
b) Rigid ground
c) Hard ground
d) Smooth ground
2.
With which of the following force between paper and pencil, we cannot write?
a) Friction force
b) Restoring force
c) Pressing force
d) Gravity force
3.
What force enables us to walk on the ground?
a) Restoring force
b) Pressing force
c) Friction force
d) Gravity force
4.
Birds could not fly, if there is no......................?
a) Air resistance
b) Restoring force
c) Reaction force
d) Gravity force
5.
By which of the following methods friction can be reduced?
a) Making the fast moving objects a wall shaped rigid
b) Never using ball bearings or roller bearing
c) Making the sliding surfaces more slippery
d) Making the sliding surfaces smooth
6.
By which of the following methods friction can be reduced?
a) Making the fast moving objects a wall shaped rigid
b) Making the sliding surfaces more slippery
c) Never using ball bearings or roller bearing
d) Making the fast moving objects a streamline shape
7.
What is meant by streamline shape?
a) Orange shape
b) Fish shape
c) None of these
d) Bullet shape
8.
By which of the following methods friction can be reduced?
a) Making the fast moving objects a wall shaped rigid
b) Making the sliding surfaces more slippery
c) Lubricating the sliding surfaces
d) Never using ball bearings or roller bearing
9.
By which of the following methods friction can be reduced?
a) Making the sliding surfaces more slippery
b) Using ball bearings or roller bearings
c) Making the fast moving objects a wall shaped rigid
d) Never using ball bearings or roller bearing
10.
What is highly desirable when climbing up a hill?
a) Friction force
b) Air resistance
c) Gravity force
d) Restoring force
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