AIPMT 2015 | Work, Energy and Power Question 21 | Physics

AIPMT 2015

MCQ (Single Correct Answer)

-1

A ball is thrown vertically downwards from a height of 20 m with an initial velocity v₀. It collides with the ground, losses 50 percent of its energy in collision and rebounds to the same height. The initial velocity v₀ is
(Take g = 10 m s^$$-$$2)

28 m s^$$-$$1

10 m s^$$-$$1

14 m s^$$-$$1

20 m s^$$-$$1

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)

-1

Two similar springs P and Q have spring constants K_P and K_Q, such that K_P > K_Q. They are stretched first by the same amount (case a), then by the same force (case b). The work done by the springs W_P and W_Q are related as, in case (a) and case (b) respectively

W_P > W_Q; W_Q > W_P

W_P < W_Q; W_Q < W_P

W_P = W_Q; W_P > W_Q

W_P = W_Q; W_P = W_Q

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)

-1

A particle of mass m is driven by a machine that delivers a constant power k watts. If the particle starts from rest the force on the particle at time t is

$$\sqrt {2mk} {\,t^{ - 1/2}}$$

$${1 \over 2}\sqrt {mk} \,{t^{ - 1/2}}$$

$$\sqrt {{{mk} \over 2}} \,{t^{ - 1/2}}$$

$$\sqrt {mk} \,{t^{ - 1/2}}$$

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)

-1

A block of mass 10 kg, moving in x direction with a constant speed of 10 m s^$$-$$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

275 J

250 J

475 J

450 J

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