Physics Past Paper Mcqs of 2022 | mosaicbro.com

Physics Past Paper Mcqs of 2022

7 of 65 questions (Page 2 of 10)

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8 Time of projectile's flight is:
Correct Answer: C
Explanation: The total time of flight for a projectile is given by T = (2v0 sin θ)/g, where v0 is the initial velocity.
9 If the velocity of the body changes by equal amount in equal intervals of time, the body is said to have:
Correct Answer: C
Explanation: Uniform acceleration implies a constant rate of change in velocity over time.
10 For finding the height of projectile, the equation used is:
Correct Answer: C
Explanation: The correct kinematic equation for height is v² = u² - 2gh, rearranged as 2gh = v² - u².
11 A ball is dropped from the roof of a very tall building. What is its velocity after falling for 5.0s?
Correct Answer: C
Explanation: Velocity v = gt = 9.8 * 5 = 49.0 m/s.
12 A projectile is launched at 45° to the horizontal with initial K.E., E. Assuming air resistance to be negligible, what will be the kinetic energy of the projectile when it reaches its highest point?
Correct Answer: B
Explanation: At the highest point, only the horizontal component of velocity remains, which is v0 cos 45° = v0/√2. Thus, KE = 0.5m(v0/√2)² = 0.5E.
13 When a heavy coin falls a short distance towards the ground it does not reach terminal velocity. Why is this so?
Correct Answer: D
Explanation: Terminal velocity is not reached because the distance is too short for air resistance to balance the coin's weight.
14 Two balls collide each other, it has been observed that the collision is elastic. Which statement advocates the observation?
Correct Answer: A
Explanation: In elastic collisions, both kinetic energy and momentum are conserved.
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