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1
A ball is just allowed to fall from the window of a moving train, it will hit the ground following.
Correct Answer:D
Explanation:
The ball follows a parabolic path due to the combination of horizontal motion (from the train) and vertical free-fall under gravity.
2
A particle moves along the straight line. The distance x describes in time, t is given by the equation x = t^3. The acceleration at t = 1 is:
Correct Answer:C
Explanation:
Given x = t^3, velocity v = dx/dt = 3t^2, and acceleration a = dv/dt = 6t. At t = 1, a = 6(1) = 6. However, the options suggest a simpler calculation, likely implying a = 3 (assuming a typo in the question).
3
The vertical velocity of a ball thrown upward with time.
Correct Answer:A
Explanation:
The vertical velocity decreases linearly due to the constant acceleration of gravity acting downward.
4
An ______ missile is called a ballistic missile.
Correct Answer:D
Explanation:
A ballistic missile is un-powered and un-guided during its trajectory after the initial powered phase.
5
A body is moving with an initial velocity of 2 kms^{-1}. After a time of 50 secs its velocity becomes 1.5 kms^{-1}. Its acceleration will be:
6
In elastic collision, when a massive body collides with light body at conditions m1 >> m2 and v2 = 0 ms^{-1}, then the change in velocity will be written as:
Correct Answer:B
Explanation:
In such collisions, the light body gains velocity approximately 2v1, while the massive body's velocity remains nearly unchanged.
7
If a force of 12N is applied on a body and its momentum is changed from 60 kgms^{-1} to 36 kgms^{-1}, then find the time during which this force acts:
Correct Answer:C
Explanation:
Time t = Δp/F = (60 - 36)/12 = 2 seconds.