MCQ Collection
NAT Physics MCQs
Practice NAT Physics questions with answers and explanations.
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Correct Answer: B. Rate of change of angular velocity
Explanation:
Angular acceleration measures how quickly rotational speed changes.
Its SI unit is rad/s².
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Correct Answer: C. Force multiplied by displacement in the force direction
Explanation:
Work transfers energy when a force acts through a displacement.
Only the component of force along displacement contributes.
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Correct Answer: C. Rotational resistance to angular acceleration
Explanation:
Moment of inertia depends on mass and its distribution about the axis.
Mass farther from the axis increases it.
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Correct Answer: D. Energy due to motion
Explanation:
Kinetic energy depends on mass and speed.
For translational motion, K=½mv².
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Correct Answer: A. Energy associated with height in a gravitational field
Explanation:
Near Earth's surface, gravitational potential energy is mgh.
Only changes in potential energy are physically significant.
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Correct Answer: B. Rate of doing work or transferring energy
Explanation:
Power measures how quickly work is done.
Its SI unit is the watt.
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Correct Answer: C. Net work equals change in kinetic energy
Explanation:
The net work on an object changes its kinetic energy.
This relation is valid for the total work of all forces.
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Correct Answer: D. When only conservative forces do work
Explanation:
Conservative forces transfer energy between kinetic and potential forms.
Nonconservative work changes total mechanical energy.
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Correct Answer: A. A force whose work depends only on initial and final positions
Explanation:
For conservative forces, work around a closed path is zero.
Gravity and ideal spring force are examples.
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Correct Answer: B. Mass multiplied by velocity
Explanation:
Linear momentum is a vector quantity p=mv.
Its direction is the direction of velocity.
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Correct Answer: C. Change in momentum
Explanation:
Impulse equals force integrated over time.
For constant force, J=FΔt=Δp.
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Correct Answer: D. 30 N
Explanation:
Opposing forces subtract.
Net force = 50-20 = 30 N.
