Free physics question bank
Power & Its Applications questions with solutions
Practice Work , Power and Energy for JEE Main, JEE Advanced, NEET, and Classes 11–12. Attempt each question, then open it for the full solution.
Showing 1–10 of 47 questions
- NumericmediumWork , Power and Energy
A body of mass 1 kg begins to move under the action of a time dependent force = (tî + 3t²ĵ) N, where î and ĵ are the unit vectors along x and y axis. The power developed by above force, at the time t = 2s. will be _______W.
JEE Mains24 January 2023Shift 2Evening Shift
Open question & full solution → - MCQmediumWork , Power and Energy
A 4 kg particle moves along x with position x(t)=t+2t³ (SI units). Find (i) kinetic energy K(t); (ii) force F(t); (iii) power P(t); (iv) work done from t=0 to 2 s.
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JEE Advanced
Open question & full solution → - MCQmediumWork , Power and Energy
Find energy ideally radiated by a 100 kW transmitter in 1 hour.
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NEET 2022
Open question & full solution → - IntegereasyWork , Power and Energy
A 5 kg block starts from rest and is pulled up a smooth 30° incline with acceleration 1 m s⁻². Find the power delivered by the pulling force at t = 10 s. Take g = 10 m s⁻². Image
JEE Mains11 April 2023Shift 2Evening Shift
Open question & full solution → - MCQeasyWork , Power and Energy
A body of mass m accelerates uniformly from rest to v₁ in time t₁. The instantaneous power delivered to the body as a function of time t is-
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JEE MainsNEET
Open question & full solution → - MCQmediumWork , Power and Energy
An electric lift of total mass 2000 kg moves upwards at constant 1.5 m s⁻¹ against a friction force of 3000 N. Take g=10 m s⁻². Minimum motor power is:
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NEET 2022
Open question & full solution → - A/ReasyWork , Power and Energy
Evaluate the following statements.
Assertion
Assertion (A): A force can be non-zero and yet its instantaneous power can be zero.
Reason
Reason (R): Instantaneous power is P = F·v, so it vanishes when force is perpendicular to velocity.
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JEE MainsNEETJEE Advanced
Open question & full solution → - NumericmediumWork , Power and Energy
A 1000 kg car moves on a horizontal road at 20 m/s against a constant resistive force of 500 N. If the engine power is 30 kW, its instantaneous acceleration is N/20 m/s². Find N.
JEE MainsNEETJEE Advanced
Open question & full solution → - MCQeasyWork , Power and Energy
A motor lifts a mass m vertically upward with constant speed v. If an additional constant downward resistive force f acts on the mass, the power delivered by the motor is:
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JEE MainsNEETJEE Advanced
Open question & full solution → - MCQmediumWork , Power and Energy
A block of mass m is being pulled up the rough inclined by an agent delivering constant power P. The coefficient of friction between the block and the inclined is µ. The maximum speed of the block during the course of ascent is:
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JEE Advanced
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