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Physics 9 Chapter 3 - Dynamics - 18
1.
On which principle rockets work?
a) Law of Conservation of Momentum
b) Newton’s first law of motion
c) Newton’s law of gravitation
d) Newton’s second law of motion
2.
On which principle jet engines work?
a) Law of Conservation of Momentum
b) Newton’s first law of motion
c) Newton’s second law of motion
d) Newton’s law of gravitation
3.
A bullet of mass 20 g is fired from a gun with a muzzle velocity 100 ms
-1
. Find the recoil of the gun if its mass is 5kg?
a) 0.4 ms
-1
b) -0.02 ms
-1
c) 0.02 ms
-1
d) -0.4 ms
-1
4.
How much time is required to change 22 Ns momentum by a force of 20 N?
a) 2 s
b) 1.1 s
c) -1.1 s
d) -2 s
5.
What is the force called that opposes the motion of moving objects?
a) Gravity force
b) Friction force
c) Restoring force
d) None of these
6.
What is friction?
a) Force that opposes the motion of moving objects
b) None of these
c) Force that provides the motion in moving objects
d) Force that restores the motion in a moving object
7.
In case of ......................., the force of friction between two bodies depends upon the pressing force between them?
a) Solids
b) Plasma
c) Gases
d) Liquids
8.
What enables the boy to move up on the walls?
a) Restoring force
b) Friction force
c) Gravity force
d) None of these
9.
The contact points between the two surfaces form a sort of.....................?
a) Bits
b) Coldwelds
c) Bumps
d) Hotwelds
10.
In case of ......................., the force of friction between two bodies depends upon nature of the two surfaces in contact?
a) Plasma
b) Gases
c) Solids
d) Liquids
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