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Physics Class 11 - Chapter 3 -
Motion And ForceTest - 4
1.
Why ballistic missile fails in some conditions of precision?
a) Due to their shape
b) Due to angle of projectile
c) All of these
d) Due to air resistance
2.
The acceleration in the rocket is proportion to nth power of velocity where value of n must be?
a) 1
b) 2
c) 3
d) -1
3.
The range of projectile at 30
o
and 60
o
are?
a) Greater than 90
b) Equal to each other
c) None of these
d) Less than 90
4.
Taking off rocket can be explained?
a) Law of conservation of momentum
b) Law of conservation of energy
c) 2nd law of motion
d) 1st law of motion
5.
Flight of rocket is n example of?
a) Second law of motion
b) Third law of motion
c) First law of motion
d) Law of conservation of energy
6.
The trajectory of a projectile is?
a) Parabola
b) Straight line
c) Circle
d) Hyperbola
7.
Time rate of change of momentum is known as?
a) Impulse
b) Moment of inertia
c) Force
d) Velocity
8.
At what angle the range of projectile is maximum?
a) 45
o
b) 90
o
c) 30
o
d) 60
o
9.
The distance covered by a body in time t starting from rest is?
a) a
2
t/2
b) V
2
t
c) at
2
/2
d) at
2
10.
The force on a wall which water strikes at speed of 10m/sec at discharge rate of0.0001m
3
/ sec is?
a) None of these
b) 1N
c) 10N
d) 100N
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