## Work, Power and Energy JEE MAIN QUIZ

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- Question 1 of 15
##### 1. Question

4 pointsThe work done in joules in increasing the extension of a spring of stiffness 10 N/cm from 4 cm to 6 cm is:

CorrectIncorrect - Question 2 of 15
##### 2. Question

4 pointsA rope is used to lower vertically a block of mass M by a distance x with a constant downward acceleration g/2 . The work done by the rope on the block is :

CorrectIncorrect - Question 3 of 15
##### 3. Question

4 pointsA body of mass 0.5 kg travels in a straight line with velocity v = ax

^{3/2}where a = 5 m^{-1/2}s^{-1}. The work done by the net force during its displacement from x = 0 to x = 2 is :CorrectIncorrect - Question 4 of 15
##### 4. Question

4 pointsA man who is running has half the kinetic energy of the boy of half is mass. The man speeds up by 1 m/s and then has the same kinetic energy as the boy. The original speed of the man was :

CorrectIncorrect - Question 5 of 15
##### 5. Question

4 pointsA bicyclist comes to skidding stop in 10 m. During this process, the force on the bicycle due to the road is 200 N and is directly proportional to the motion. The work done by the cycle on the road is:

CorrectIncorrect - Question 6 of 15
##### 6. Question

4 pointsA mass of 5 kg is moving along a circular path of radius 1 m. If the mass moves with 300 revolutions per minute, its kinetic energy would be:

CorrectIncorrect - Question 7 of 15
##### 7. Question

4 pointsIn a shotput event an athlete throws the shotput of mass 10 kg with initial speed of 1 m/s at 45º from a height 1.5 m above ground. Assuming air resistance to be negligible and acceleration due to gravity be 10 m/s² , the kinetic energy of the shotput when it just reaches ground will be:

CorrectIncorrect - Question 8 of 15
##### 8. Question

4 pointsA block of mass m is hung vertically from an elastic thread of force constant mg/a. Initially the thread was at its natural length and the block is allowed to fall freely. The kinetic energy of the block when it passes through the equilibrium position will be :

CorrectIncorrect - Question 9 of 15
##### 9. Question

4 pointsA body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at a time t is proportional to:

CorrectIncorrect - Question 10 of 15
##### 10. Question

4 pointsWhen a conservative force does positive work on a body :

CorrectIncorrect - Question 11 of 15
##### 11. Question

4 pointsA particle is released from rest at origin. It moves under influence of potential field U = x² – 3x, kinetic energy at x =2 is :

CorrectIncorrect - Question 12 of 15
##### 12. Question

4 pointsAssume the aerodynamic drag force on a car is proportional to it speed. If the power output from the engine is doubled, then the maximum speed of the car:

CorrectIncorrect - Question 13 of 15
##### 13. Question

4 pointsA light spring of length 20 cm and force constant 2 N/m is placed vertically on the table. A small block of mass 1 kg falls on it. The length h from the surface of the table at which the block will have maximum velocity is :

CorrectIncorrect - Question 14 of 15
##### 14. Question

4 pointsA mass of M kg is suspended by a light string . The horizontal force required to displace it until the string makes an angle of 45° with the vertical direction is :

CorrectIncorrect - Question 15 of 15
##### 15. Question

4 pointsThe potential energy of a 1 kg particle free to move along the x-axis is given by U(x) = ( x

^{4}/4 – x²/2) J. The total mechanical energy is 2 J. Then the maximum speed (in m/s) is :CorrectIncorrect