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OBJECTIVE QUESTIONS FOR NEET AIIMS JIPMER wisedane

Practice essential work, energy, and power questions in physics to ace NEET, AIIMS, JIPMER exams. Detailed explanations included for comprehensive learning.

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OBJECTIVE QUESTIONS FOR NEET AIIMS JIPMER wisedane

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  1. OBJECTIVE QUESTIONS FOR NEET AIIMS JIPMER www.wisedane.com

  2. PHYSICS WORK ENERGY AND POWERMCQ’S

  3. Q1. A uniform rope of linear density d and length l is hanging from the edge of a table. The work done in pulling the rope on to the table is

  4. ANSWER (B) EXPLANATION

  5. Q2. A body is under the action of two equal and opposite forces, each of 3 N. The body is displaced by 2 m. The work done is : • + 6 J • – 6 J • 0 • None of the above

  6. ANSWER (C) EXPLANATION

  7. Q3. The relationship between force and position is shown in Figure (in one dimensional case). The work done by the force in displacing a body from x = 1 cm to x= 5 cm is : • 20 erg • 60 erg • 70 erg • 700 erg

  8. ANSWER (A) EXPLANATION

  9. Q4. The vessels A and B of equal volume and weight are immersed in water to depth h. The vessel A has an opening at the bottom through which water can enter. If the work done in immersing A and B are WA and WB respectively, then : • WA = WB • WA < WB • WA > WB

  10. ANSWER (B)EXPLANATION • Because water enters into the vessel A, it becomes heavier. Gravity helps it to sink External work required for immersing A is obviously less than that for immersing B, i.e., WA<WB

  11. Q5. A cord is used to lower vertically a block of mass M, a distance d at a constant downward acceleration of g/4. The done by the cord on the block is

  12. ANSWER (C)EXPLANATION • As the cord is trying to hold the motion of the block, work done by the cord is negative .

  13. Q6. The work done in time t on a body of mass m which is accelerated from rest to a speed v in time t1 as a function of time t is given by :

  14. ANSWER (D) EXPLANATION

  15. Q7. Work done by a simple pendulum in a complete vibration is

  16. ANSWER (A)EXPLANATION • In complete vibration, final position coincides with the initial position. Therefore, W =0

  17. Q8. A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acc. Due to gravity , work required to pull the hanging part on the table is • Mg L • Mg L/3 • Mg L/9 • Mg L/18

  18. ANSWER (D) EXPLANATION

  19. Q9. A body of mass 500 g is taken up an inclined plane of length 10 m and height 5 m, and then released to slide down to the bottom. The coefficient of friction between the body and the plane is 0.1. What is the amount of work of work done in the round trip ? • 5 J • J • 5 • J

  20. ANSWER (C)EXPLANATION • Work done in round trip = total work done against friction in both, moving up and down the plane

  21. Q10. A force (mv2/r) is acting on a body of mass m moving with a velocity v in a circle of radius r. What is the work done by the force in moving the body over half the circumference of the circle ?

  22. ANSWER (B) EXPLANATION

  23. Q11. A body constrained to move in y – direction is subject to a force .What is the work done by this force in moving the body through a distance of 10 m along the y –axis ? • 20 j • 150 J • 160 J • 190 J

  24. ANSWER (B)EXPLANATION

  25. Q12. The PE and KE of helicopter flying horizontally at a height 400 m are in the ratio 5:2. The velocity of helicopter is • 28 m/s • 14 m/s • 56 m/s • 30 m/s

  26. ANSWER (C)EXPLANATION

  27. Q13. A body is projected vertically up. At certain height h above the ground, its PE and KE are in the ratio 1 : 4. At what above the ground. PE and KE will be in the ratio 4 : 1? • 4 h • h/4 • 5 h • h/5

  28. ANSWER (A) EXPLANATION

  29. Q14. In the above question, the maximum height reached by the body is • 4 h • 9 h • 5 h • H

  30. ANSWER (S) EXPLANATION

  31. Q15. A 120 g mass has a velocity at a certain instant. KE of the body at that instant is • 3.0 J • 1.74 J • 4.48 J • 5.84 J

  32. ANSWER (B)EXPLANATION

  33. Q16. A missile is released with a velocity less than the escape velocity. The sum of its potential and kinetic energies is • Negative • Positive • Zero • Cannot say

  34. ANSWER (A) EXPLANATION • When the velocity is less than the escape velocity, the missile cannot escape the gravitational field of earth. Within the gravitational field, the sum of potential and kinetic energies of the missile will be negative

  35. Q17. A meter stick of mass 400 g is pivoted at one end and displaced through an angle of 60o. The increase in its potential energy is : • 1 J • 10 J • 100 J • 1000 J

  36. ANSWER (A)EXPLANATION

  37. Q18. The energy required to accelerate a car from 10 m/s to 20 m/s is n times the energy required to accelerate the same from rest to 10 m/s, where n is : • 1 • 4 • 2 • 3

  38. ANSWER (D)EXPLANATION

  39. Q19. The amount of work done in pumping water out of a cubical vessel of height 1 m is nearly (g = 10 ms-2): • 5,000 J • 10,000 J • 5 j • 10 J

  40. ANSWER (A) EXPLANATION

  41. Q20. Two bodies A and B having masses in the ratio 1 : 3 possess the same kinetic energy. The ratio of linear momentum of B to A is : • 1 : 3 • 3 : 1

  42. ANSWER (D)EXPLANATION

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