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WORK POWER AND ENERGY JEE ADVANCED QUESTIONS
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51. Two inclined frictionless tracks of different inclinations meet at A from where two blocks P and Q of different masses are allowed to slide down from rest at the same time, one on each track, as shown in Fig. Then
(a) Both blocks will reach bottom at the same time
(b) Block Q will reach the bottom earlier than block B
(c) Both blocks will reach the bottom with the same speed
(d) Block Q will reach the bottom with a higher speed block P
Ans. (b), (c)
52. The potential energy curve for interaction between two molecules is shown in Fig. 8-68. Which of the following statements are true?
(a) The molecules have maximum attraction for r = OA
(b) The molecules have maximum kinetic energy for r = OR
(c) The intermolecular force is zero for r = OB
(d) For the gaseous state, the depth HD of the potential well is much smaller than KT
Ans. (b), (c), (d)
53. Which of the following statements are correct?
(a) A pendulum bob suspended by a string of length l is pulled to one side so that it is at a height l/4 above the rest position. If the bob is now released from rest, its speed at the lowest point will be
(b) If the mass and velocity of a moving body are increased three times and two times, respectively them the kinetic energy is increased by a factor of 12
(c) A boat is being towed at a velocity of 20 m/s If the tension in the tow-line is 6 kN, then the power supplied to the boat is 120 kW
(d) It the work done in increasing the extension of a spring from 0.4 m to 0.5 m is 18j, then the spring constant is 400 Nm
Ans. (a), (b), (c), (d)
Ans. (a), (b), (c)
56. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that
(a) Its velocity is constant
(b) Its acceleration is constant
(c) Its kinetic energy is constant
(d) It moves in circular path
Ans. (c), (d)
57. No work is done by a force on an object if
(a) the force is always perpendicular to its velocity
(b) the force is always perpendicular to its acceleration
(c) the object is stationary but the point of application of the force moves on the object
(d) the object moves in such a way that the point of application of the force remains fixed.
Ans. (a), (c), (d)
ALSO VISIT : MOTION IN ONE DIMENSION IIT JEE QUESTIONS
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