Quiz  /  Work Done By Variable Force MCQ

  • 1. 
    There are two springs with the force constant as k1 and k2 (k1＞k2). They are stretched by the same force then

  • More work is done in the first spring
  • In both springs equal work is done
  • In the second spring, more work is done
  • No work is done in both the springs

  • 2. 
    A spring with an initial stretch of  0.20 m has a force constant 10 N/m. When the stretch is changed to 0.25 m, the increase in potential energy is

  • 0.2 joule
  • 0.3 joule
  • 0.1 joule
  • 0.5 joule

  • 3. 
    Same force is used to stretch two springs of spring constants 1500 N/m and 3000 N/m respectively. What will be the ratio of potential energy?

  • 1:4
  • 2:1
  • 4:1
  • 1:2

  • 4. 
    What will be the work done in stretching the  spring through 40 mm if 10 N force is required to stretch the spring through 1 mm

  • 68 J
  • 23 J
  • 84 J
  • 8 J

  • 5. 
    A body moving with a velocity 10 m/s and having a mass 0.1 kg hits a spring (fixed at the other end) of force constant 1000 N/m and comes to rest after compressing the spring. What will be the value of compression of the spring?

  • 0.1 m
  • 0.2 m
  • 0.01 m
  • 0.5 m

  • 6. 
    A spring having an extension of 5 cm has a force constant 800 N/m. The work done in extending it from 5 cm to 15 cm is

  • 16 J
  • 8 J
  • 32 J
  • 24 J

  • 7. 
    100 J of energy is stored by a spring when it is stretched by 2 cm. If it is stretched further by 2 cm, the stored energy will be increased by

  • 100 J
  • 200 J
  • 300 J
  • 400 J

  • 8. 
    The potential energy is 4 J for spring when it is stretched by 2 mm. If it is stretched by 10 mm, its potential energy is equal to

  • 4 J
  • 54 J
  • 415 J
  • 100 J

  • 9. 
    What would be the maximum compression of the spring if a mass of 0.5 kg moving on a horizontal smooth surface with a speed of 1.5 m/s  collides with a nearly weightless spring of force constant k= 5 N/m.

  • 0.5 m
  • 0.12 m
  • 1.5 m
  • 0.15 m

  • 10. 
    A spring has a spring constant k. When the spring is stretched through 1 cm, the potential energy will be U. What will be the potential energy if it is stretched by 4 cm?

  • 4 U
  • 8 U
  • 16 U
  • 2 U
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