⚡Chapter Practice
Work, Energy & Power — JEE Practice
45 practice questions across 3 topics. Filter by difficulty, solve topic-wise MCQs, and review detailed solutions.
3 Topics45 Questions
Work & Kinetic Energy(15 Qs)
easy (5)
medium (5)
Q1A force F = 3x² N acts on a particle. Work done in moving from x=2 to x=4 m is:Q2A 5 kg block slides down a 10 m frictionless incline (30°). Its speed at the bottom is (g=10 m/s²):Q3Work-energy theorem states:Q4A 1000 kg car brakes from 20 m/s to 10 m/s. The work done by brakes is:Q5A body of mass 2 kg is thrown upward at 10 m/s. The work done by gravity until it stops is:
hard (5)
Q1A chain of mass m and length L lies on a table with 1/3 hanging. Work done to pull the entire chain onto the table is:Q2A force F = (2i + 3j) N displaces a body by d = (4i - j) m. Work done is:Q3Two bodies of masses m and 4m have equal kinetic energy. The ratio of their momenta is:Q4A particle moves under F = -kx (spring force). The work done in stretching from x₁ to x₂ is:Q5A bullet of mass 20 g moving at 400 m/s penetrates a block and comes to rest. If the block offers constant resistance, and the bullet penetrates 0.2 m, the resistance force is:
Potential Energy & Conservation(15 Qs)
easy (5)
Q1The potential energy of a 3 kg body at height 10 m is (g=10 m/s²):Q2In a conservative force field, the total mechanical energy is:Q3The potential energy stored in a spring compressed by 0.1 m with k = 200 N/m is:Q4When a ball falls freely, its potential energy:Q5The reference point for gravitational PE can be:
medium (5)
Q1A spring with k = 500 N/m is stretched by 0.2 m. If it propels a 0.5 kg ball, the speed of the ball is:Q2A ball is dropped from 20 m. At what height is KE = PE? (g=10 m/s²)Q3A 2 kg block on a spring (k = 800 N/m) is compressed 0.1 m and released on a rough surface (μ = 0.4). How far does it travel? (g=10 m/s²)Q4A ball of mass m falls from height h onto a spring of constant k. Maximum compression x satisfies:Q5The force F corresponding to PE U = 3x² - 4x + 7 is:
hard (5)
Q1A ball is released from the top of a smooth hemispherical bowl of radius R. The normal force at angle θ from the vertical is:Q2The escape velocity from Earth surface is v_e. A body projected at v_e/2 will reach a maximum height of:Q3A particle slides from the top of a fixed smooth sphere of radius R. It leaves the sphere at angle θ from vertical where:Q4A rocket of mass m is at height R (Earth radius) above Earth surface. The minimum energy to send it to infinity is:Q5A block of mass m slides down a curved frictionless ramp from height h, then along a rough flat surface (μ). It stops after distance d. The expression for d is:
Power(15 Qs)
easy (5)
medium (5)
Q1A car of mass 1000 kg moves at constant speed 20 m/s against friction 500 N. The engine power is:Q2A body of mass m is accelerated from rest by a constant power P. Its velocity after time t is:Q3The power delivered by gravity to a 2 kg ball falling freely after 3 s (g=10 m/s²) is:Q4A car engine delivers constant power P. The maximum speed on level road with friction force f is:Q5A motor of efficiency 80% lifts 50 kg to 20 m in 10 s. The input power (g=10 m/s²) is:
hard (5)
Q1A car of mass m starts from rest with constant power P. The distance covered in time t is:Q2A car of mass 1000 kg has max engine power 50 kW. Resistance = 0.5v² N. Maximum speed is:Q3A mass m falls freely from height h. The average power during the fall is:Q4A vehicle of mass M can climb a slope of angle θ at speed v₁ and descend at speed v₂ with constant power P and same resistance f. Then P equals:Q5An engine of power P pulls a train of mass m on level track. Resistance force = kv. The time to reach half the maximum speed from rest:
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