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Online Tests
Physics ECAT Pre Engineering Chapter 3 Motion and Force Online Test MCQs With Answers
Question # 1
A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?
Choose an answer
0.1 m/s
10 m/s
1 m/s
0.01 m/s
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Question # 2
If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is
Choose an answer
a = M/mv
a = mM/v
a = mv/M
a = v/mm
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Question # 3
The vertical component of velocity of a projectile during its motion is minimum
Choose an answer
at the time of projection
at the highest point
just before hitting the plane of projection
all of them
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Question # 4
By which velocity a ball be projected vertically so that the distance covered by it in 5th seconds is twice the distance it covers in its 6th second ( g=10m/s
2
)
Choose an answer
58.8 m/s
49 m/s
65 m/s
19.6 m/s
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Question # 5
When two protons are brought closer potential energy of both of them:
Choose an answer
Increases
Decreases
Remains same
None of these
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Question # 6
The magnitude of the force producing an acceleration of 10 m/sec
2
in a body of mass 500 grams is:
Choose an answer
3 N
4 N
5 N
6 N
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Question # 7
The entity which measures the quantity of motion in a body is called
Choose an answer
force
energy
momentum
power
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Question # 8
A railway engine (mass 10
4
kg) is moving with a speed of 73 km/h. The force which should be applied to bring it to rest over a distance of 20 m is
Choose an answer
3,600 N
7,200 N
10,000 N
100,000 N
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Question # 9
One KWh is equal to:
Choose an answer
3.6 x 10
2
J
3.6 KJ
3.6 x 10
1
KJ
3.6 MJ
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Question # 10
A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is
Choose an answer
0.15 x 10
-3
Ns
0.98 x 10
-3
Ns
1.5 x 10
-3
Ns
2.5 x 10
-3
Ns
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Question # 11
The time rate of change of displacement is called:
Choose an answer
Time
Acceleration
Speed
Velocity
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Question # 12
Newton published laws of motion in his famous book "principia" in
Choose an answer
1867
1667
1676
1687
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Question # 13
The path described by a projectile is called its
Choose an answer
orbit
trajectory
range
distance
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Question # 14
The time of flight of a projectile motion equal to
Choose an answer
half of the time to reach maximum height
twice the time to reach maximum height
one fourth of time to reach maximum height
time to reach maximum height
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Question # 15
A the top of the trajectory of a projectile, the directions of its velocity and acceleration are
Choose an answer
Perpendicular to each other
Parallel to each other
Inclined to each other at an angle of 45
°
Anitparallel to each other
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Question # 16
The effect of applying a force on a moving body is to change
Choose an answer
its direction of motion only
its speed of motion only
both the direction and speed of motion
its inertia only
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