Work, Energy and Power MCQ (NEET, JEE Main) – Test 1 2

Two identical balls A and B having velocities of 0.5 m/s and –0.3 m/s respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be [NEET UG 2016]

A block of mass 10 kg moving in x direction with a constant speed of 10 ms^–1, is subjected to a retarding force F = 0.1x J/m during its travel from x = 20 m to 30 m. Its final KE will be [AIPMT 2015]

A particle of mass m moving in the x direction with speed 2v is hit by another particle of mass 2m moving in the y direction with speed v. If the collision is perfectly inelastic, the percentage loss in the energy during the collision is close to [JEE Main 2015]

This question has Statement 1 and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements.

If two springs S1 and S2 of force constants k₁ and k₂, respectively, are stretched by the same force, it is found that more work is done on spring S₁ than on spring S₂.

Statement 1 : If stretched by the same amount, work done on S₁, will be more than that on S₂

Statement 2 : k₁ < k₂ [AIEEE 2012]

A force F acting on an object varies with distance x as shown here. The force is in N and x in m. The work done by the force in moving the object from x = 0 to x = 6 m is [CBSE AIPMT 2005]