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Law of Motion MCQ question and answer with solution | Physics Gk MCQs

Learn Law of Motion MCQ Questions and answers with easy and logical explanations in Physics Gk . Law of Motion MCQ question provides all type of technical mcq questions which is important for SSC-CGL, UPPSC, NDA, CDS and all govt examinations Page-7 section-2

Each section contains 100 MCQs on Law of Motion .
61
A racing car accelerates on a straight line from rest to a speed of 50 m/s in 25 s. Assuming uniform acceleration of the throughout, the distance covered in this will be
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Answer & Solution
Answer: Option A
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62
The motion of an object in a specified direction is called.
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Answer & Solution
Answer: Option C
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63
Which activity is not based upon kinetic friction
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Answer: Option C
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64
Assertion (A) Newton's Third Law of Motion is applicable only when bodies are in motion.
Reason (R) Newton's Third Law applies to all types of forces, e.g. gravitational, electric or magnetic forces etc.
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Answer & Solution
Answer: Option D
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65
The product of mass and acceleration is called.
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Answer: Option D
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66
If an object moves with constant velocity, then which one of the following statement is not correct?
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Answer & Solution
Answer: Option B
Solution:
First, what does "constant velocity" mean? It means the object is moving at a steady speed AND in a steady direction.

Let's look at each option:

Option A: Its motion is along a straight line
If the velocity is constant (steady speed and direction), the object *must* be moving in a straight line. If it curved, the direction would be changing, and thus the velocity wouldn't be constant. So, this statement IS correct.

Option B: Its speed changes with time
If the velocity is *constant*, the speed *cannot* change. The speed is staying the same. So, this statement is NOT correct, and likely our answer.

Option C: Its acceleration is zero
Acceleration is the rate of change of velocity. If the velocity isn't changing (it's constant), then the acceleration is zero. So, this statement IS correct.

Option D: Its displacement increases linearly with time
Displacement is the change in position. If you're moving at a steady speed in a straight line, the distance you cover (displacement) increases at a steady rate. That's what "linearly" means. So, this statement IS correct.

Therefore, the answer is Option B: Its speed changes with time. Because with constant velocity, the speed cannot change.
67
Shot from a rifle. What will be the kinetic energy of the rifle if the rifle comes backwards without stopping?
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Answer: Option B
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68
Two bodies A and B are moving with equal velocities. The mass of B is doubled that of A. In this context, which one of the following statement is correct?
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Answer: Option A
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69
Retardation means an object operates from . . . . . . . .
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Answer: Option B
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70
Match the columns.
Column I Column II
a. Impulse 1. walking on ground
b. Newton's Third Law of Motion 2. Bogies of trains are provided with buffers
c. Inertia of direction 3. An athlete runs some distance before a taking jump
d. Inertia of Motion 4. Mud flying tangentially to the tyre of car
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Answer: Option A
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