JEE Questions for Physics Work Energy And Power Quiz 16 - MCQExams.com

Adjacent figure shows the force-displacement graph of a moving body, the work done in displaying body from x = 0 to x = 35 m is equal to
Physics-Work Energy and Power-98712.png
  • 50 J
  • 25 J
  • 287.5 J
  • 200 J
A 10 kg mass moves along x-axis. Its acceleration as a function of its position is shown in the figure. What is the total work done on the mass by the force as the mass moves from x = 0 to x = 8 cm
Physics-Work Energy and Power-98714.png
  • 8 × 10–2 joules
  • 16 × 10–2 joules
  • 4 × 10–2 joules
  • 1.6 × 10–2 joules
A toy car mass 5 kg moves up a ramp under the influence of force F plotted against displacement x. The maximum height attained is given by
Physics-Work Energy and Power-98716.png
  • Ymax = 20 m
  • Ymax = 15 m
  • Ymax = 11 m
  • Ymax = 5 m
The relation between the displacement X of an object produced by the application of the variable force F is represented by a graph shown in the figure. If the object undergoes a displacement from X = 0.5 m to X = 2.5 m the work done will be approximately equal to
Physics-Work Energy and Power-98718.png
  • 16 J
  • 32 J
  • 1.6 J
  • 8 J
The potential energy of a system is represented in the first figure. The force acting on the system will be represented by
Physics-Work Energy and Power-98720.png

  • Physics-Work Energy and Power-98721.png
  • 2)
    Physics-Work Energy and Power-98722.png

  • Physics-Work Energy and Power-98723.png

  • Physics-Work Energy and Power-98724.png
A particle, initially at rest on a frictionless horizontal surface, is acted upon by a horizontal force which is constant in size and direction. A graph is plotted between the work done (W) on the particle, against the speed of the particle, (v). If there are no other horizontal force acting on the particle the graph would look like

  • Physics-Work Energy and Power-98726.png
  • 2)
    Physics-Work Energy and Power-98727.png

  • Physics-Work Energy and Power-98728.png

  • Physics-Work Energy and Power-98729.png
The force acting on a body moving along x-axis varies with the position of the particle as shown in the fig.
Physics-Work Energy and Power-98731.png
  • x = x1
  • x = x2
  • Both x = x1 and x = x2
  • Neither x = x1 nor x = x2
A particle of mass m moving with a velocity u makes an elastic one dimensional collision with a stationary particle of mass m establishing a contact with if for extremely small time T. Their force of contact increases from zero to F0 linearly in time T / 4, remains constant for a further time T / 2 and decreases linearly from F0 to zero in further time T / 4 as shown. The magnitude possessed by F0 is
Physics-Work Energy and Power-98732.png

  • Physics-Work Energy and Power-98733.png
  • 2)
    Physics-Work Energy and Power-98734.png

  • Physics-Work Energy and Power-98735.png

  • Physics-Work Energy and Power-98736.png
Six identical balls are lined in a straight groove made on a horizontal frictionless surface as shown. Two similar balls each moving with a velocity v collide elastically with the row of 6 balls from left. What will happen
Physics-Work Energy and Power-98744.png
  • One ball from the right rolls out with a speed 2v and the remaining balls will remains at rest
  • Two ball from the right roll out with speed v each and the remaining balls remain stationary
  • All the six balls in the row will roll out with speed v/6 each and the two colliding balls will come to rest
  • The colliding balls will come to rest and no ball rools out from right.
Choose the incorrect statement
  • No work is done if the displacement is perpendicular to the direction of the applied force
  • If the angle between the force and displacement vectors is obtuse, then the work done is negative
  • Frictional force in non-conservative
  • All the central forces are non-conservative
  • Kinetic energy is conserved in elastic collision
Assertion The change in kinetic energy of a particle is equal to the work done on it by the net force.
Reason Change in kinetic energy of partide is equal to the work done only in case of a system of one particle.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
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