Work, Energy and Power: NEET questions with solutions

NEET tests the work-energy theorem, spring potential energy, power and efficiency, conservative forces, and one-dimensional elastic collisions. Marks are lost to missing cos θ factors, leaving friction out of energy accounting, confusing momentum ratios with kinetic-energy ratios, and assuming each body's kinetic energy is conserved in an elastic collision.

1. 1.A box is dragged 8.0 m along a straight horizontal floor by a rope. The rope pulls with a constant force of 25 N directed at 60° above the…WorkEasySingle correct
2. 2.The linear momentum of a body of fixed mass increases by 30%. By what percentage does its kinetic energy increase?Kinetic energyEasySingle correct
3. 3.Read the Assertion (A) and Reason (R) about a one-dimensional elastic collision between two bodies of different masses, and choose the…CollisionsEasyAssertion–Reason
4. 4.A 0.50 kg block slides at 2.0 m/s on a smooth horizontal surface and runs head-on into the free end of a light horizontal spring of spring…Potential energy of a springMediumSingle correct
5. 5.An electric pump lifts 200 kg of water through a vertical height of 15 m every minute, delivering it at negligible speed. The pump is 75%…PowerMediumSingle correct
6. 6.A 2.0 kg block is given an initial speed of 6.0 m/s along a rough horizontal floor and slides to rest. The coefficient of kinetic friction…Work-energy theoremMediumSingle correct
7. 7.The four claims I to IV below concern conservative forces, potential energy and mechanical energy. Pick the option listing exactly the true…Conservative forces and potential energyMediumStatement based
8. 8.A 2 kg ball moving at 6 m/s on a smooth horizontal track collides head-on, elastically, with a 4 kg ball that is at rest. What fraction of…Collisions (elastic collision in one dimension)HardSingle correct
9. 9.A 0.50 kg block is released from rest at a height of 1.8 m on a smooth curved ramp. At the bottom, the ramp joins a horizontal floor. The…Conservation of mechanical energy with frictionHardSingle correct