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Chapter, Practice, PART 1|, 7. The work done on an object does not depend un, the, (NCERT Exemp, (b) force applied, (a) displacement, (c) angle between force and displacement, (d) initial velocity of the object, 8. If two stones A and B are dropped from a tower i, which one has maximum kinetic energy, (a) Lighter stone, (c) Both have equal, Objective Questions, 1. In case of negative work, the angle between the force, and displacement is, (NCERT Exemplar), (b) Heavier stone, (d) None of these, (d) 180, 0 (), 2. A girl is carrying a school bag of 3 kg mass on her, back and moves 200 m on a levelled road. The work, done against the gravitational force will be, [Take, g 10 ms 1, (b) 45°, 06 (0), 9. A monkey weighing 50 kg climbs up a vertical tro, height 300 m. How much potential energy does it, gain? [Take, g =9.8 m/s ], (a) 1.47 x 10 J, (c) 14.7 x 10° J, (NCERT Exemplar), (b) 14.7 x 10 J, (d) 14.7 x 10 J, (90(), o1az (P), (9(4 f01*9 (W), 3. In the graph given below, frictional force tersus, displacement for a particle in motion is shown. The, loss of kinetic energy (work done against friction) in, travelling over s 0 to s 20 m will be, 10. When a body falls freely towards the earth, then i, total energy, (NCERT Exempl, (b) decreases, (a) increases, (c) remains constant, (d) first increases and then decreases, 11. A ball is allowed to fall freely from a tower as show, in the figure., 12-, 4., 10 15 20 s(metre), 5., Ball, (c) 240 J, f 0, (d) 24 J, 4. In which case, work done will be zero?, (os (), h/2, (a) A weight-lifter while holding a weight of 100 kg on his, Ground, shoulders for 1 min., Tower, (b) A person holding a suitcase on his head and standing, at a bus terminal., Which energy is possessed at the middle point, during the fall ?, (a) Kinetic only, (c) Both potential and kinetic (d) Heat only, 12. Which of the following statement(s) is/are corr, (a) Absolute value of potential energy cannot be, determined., (b) Absolute value of kinetic energy can be deternu, because velocity is not measured in relative te, (c) Absolute value of force cannot be determined, measurement of acceleration is not possible., (d) None of the above, (c) A locomotive against gravity is running on a level plane, with a speed of 60 kmh", (d) All of the above, (b) Potential only, 5. When a horse pulls a cart, who does the work ?, (m) Cart, (b) Wheels, (d) Horse, (c) Road, 6. If 10 N of force is applied to an object, but the object, does not move, then how much work is being done, by the force?, (w) Zero, (d) 20 J, for ()