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22
A body covers displacement of 10m towards North and returns back to initial point by covering 10m towards south, its total displacement is:
Correct Answer:C
Explanation:
Displacement is the net change in position, which is zero when returning to the starting point.
23
In Newton's first law of motion which quantity remains constant:
Correct Answer:A
Explanation:
Newton's first law states that velocity remains constant in the absence of net force.
24
Law of inertia satisfies:
Correct Answer:A
Explanation:
Inertia describes resistance to change in motion, which is a condition of equilibrium.
25
A projectile is launched, its velocity is maximum at:
Correct Answer:A
Explanation:
Velocity is maximum at launch, as it decreases due to gravity during ascent.
26
The net displacement divided by the total time (t) is known as:
Correct Answer:C
Explanation:
Average velocity is defined as net displacement over total time.
27
The velocity-time graph of a motion starting from rest with uniform acceleration is a straight line:
Correct Answer:D
Explanation:
For motion starting from rest (v=0 at t=0), the graph passes through the origin.
28
A projectile is thrown at an angle of 45° with horizontal and its range is R1. Another projectile is thrown at an angle of 45° with vertical and its range is R2. The relation between R1 and R2 is:
Correct Answer:C
Explanation:
Angles 45° with horizontal and 45° with vertical (i.e., 45° and 45°) yield the same range.