Olympiad – Class IX – Science - Phy - Work, Energy and Power

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Question - 1

Find the work done by a force of 5 N in displacing a book through 20 cm along the direction of the push.

  • A 1 J
  • B 3 J
  • C 4 J
  • D 5 J

Question - 2

A ball of mass 1 kg thrown upwards reaches a maximum height of 5 m. Calculate the work done by the force of gravity during this vertical displacement

  • A - 30 J
  • B - 48 J
  • C - 49 J
  • D - 59 J

Question - 3

An object of mass 1 kg is raised through a height 'h', Its potential energy is increased by 1 J. Find the height.

  • A 0.102 m
  • B 0.105 m
  • C 0.130 m
  • D 0.11 0 m

Question - 4

Find the kinetic energy of a ball of mass 200 g moving at a speed of 20 cm s-1

  • A 0.4 J
  • B 0.004 J
  • C 0.001 J
  • D 0.1 J

Question - 5

Find the work done by a student in lifting a 0.5 kg book from the ground and keeping it on a shelf of height 1.5 m

  • A 8.30 J
  • B 7.35 J
  • C 5.40 J
  • D 6.45 J

Question - 6

A block of mass 1 kg slides down on an inclined plane with the angle of inclination of 30°. Find the work done as the block slides through 50 cm.

  • A 3.45 J
  • B 5.30 J
  • C 2.45 J
  • D 4.50 J

Question - 7

A body of mass 0.5 kg is taken to a height Re above the earth's surface, where Re is the radius of the earth. If the body is now raised through a height of 2 m, what is the increase in its potential energy?

  • A 0.25 J
  • B 0.50 J
  • C 0.75 J
  • D 1.25 J

Question - 8

A force of 10 N displaces an object through 20 cm and does the work of 1 J in the process. Find the angle between the force and displacement.

  • A Ø = 60°
  • B Ø = 50°
  • C Ø = 35°
  • D Ø = 45°

Question - 9

How long will it take to perform 440 J of work at the rate of 11 W?

  • A 50 s 
  • B 40 s
  • C 30 s
  • D 20 s

Question - 10

When a stone tied to a string is whirled in a circle, what kind of work is said to be done on it by the string

  • A Positive
  • B Negative
  • C Zero
  • D Undefined