Kinematics Quiz - ICSE Class 11 Physics
Free practice quiz: Kinematics (ICSE Class 11 Physics). 48 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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A particle starts from rest and moves with a constant acceleration of 5 m/s². What will be its velocity after 10 seconds?
- 50 m/s
- 5 m/s
- 10 m/s
- 25 m/s
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Answer: A. 50 m/s
We can use the first equation of motion, v = u + at. Given u (initial velocity) = 0 m/s (starts from rest), a (acceleration) = 5 m/s², and t (time) = 10 s. Therefore, v = 0 + (5 m/s²) * (10 s) = 50 m/s.
A particle undergoes uniform acceleration. If its velocity changes from v₁ to v₂ in time t, then its acceleration is:
- (v₂ - v₁) / t
- (v₁ - v₂) / t
- (v₁ + v₂) / t
- t / (v₂ - v₁)
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Answer: A. (v₂ - v₁) / t
Acceleration is defined as the rate of change of velocity. For uniform acceleration, a = (change in velocity) / (time taken). Change in velocity = final velocity - initial velocity = v₂ - v₁. Time taken = t. Therefore, acceleration a = (v₂ - v₁) / t.
A wheel rotates with a constant angular acceleration of 2 rad/s². If it starts from rest, what is its angular velocity after 5 seconds?
- 2 rad/s
- 5 rad/s
- 10 rad/s
- 2.5 rad/s
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Answer: C. 10 rad/s
We use the rotational equivalent of the first equation of motion: ω = ω₀ + αt. Here, ω₀ (initial angular velocity) = 0 (starts from rest), α (angular acceleration) = 2 rad/s², and t = 5 s. Therefore, ω = 0 + (2 rad/s²) * (5 s) = 10 rad/s.
What is the distance covered by a particle moving with uniform velocity v for time t?
- v/t
- t/v
- vt
- v+t
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Answer: C. vt
For uniform velocity, distance (s) = velocity (v) × time (t).
A body is moving with constant speed in a circle. Which statement is correct?
- Its velocity is constant.
- Its acceleration is zero.
- Its speed is constant.
- Its displacement is non-zero in one revolution.
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Answer: C. Its speed is constant.
In uniform circular motion, the speed is constant, but the velocity is not constant because the direction of motion is continuously changing. This changing velocity implies a non-zero acceleration (centripetal acceleration). The displacement in one complete revolution is zero.