## Physics MCQ on Work Power and Energy for NEET, JEE, Medical and Engineering Exam 2021

MCQ on Work Power and Energy: Previous trends reveal that NEET/JEE aspirants find Physics as the most challenging section amongst the other sections. But most of them fail to decipher the reason behind this. This particularly can be as the candidates taking up this examination are predominantly medical aspirants with their subject of interest being Biology. Also, sections like Physics are more on theories, laws, numerical as opposed to Biology which is more of fact-based, life sciences and comprising of substantial explanations. In this post we are providing you MCQ on Work Power and Energy, which will be beneficial for you in upcoming NEET, AIIMS, JEE, WBJEE, Medical and Engineering Exams.

## MCQ on Work Power and Energy

Q1. What is the average power required to lift a mass of 100kg to a height of 50m in 50 seconds?
a) 980
b) 100
c) 50
d) 5000

(a) 980

Q2. Select the incorrect statement for the given situation: Two bodies with mass m1 and m2 undergo elastic collision.
a) When m1 and m2 is at rest, the kinetic energy transferred will be maximum
b) The bodies will move in the same direction if m1 = m2 and when the collision is in oblique
c) When m1 > m2, m2 will move with four times increase in its velocity than m1
d) When m1 < m2, the transfer of momentum will be maximum

(c) When m1 > m2, m2 will move with four times increase in its velocity than m1

Q3. By how much does kinetic energy increase if the momentum is increased by 20% ?
a) 55%
b) 66%
c) 44%
d) 77%

(c) 44%

Q4. A ball is thrown from a height of 20 m vertically downward and has an initial velocity of v20 As the stone collides with the ground 50% of its energy is lost and bounce back to the same height. What is the initial velocity?
a) 28m/s
b) 20m/s
c) 10m/s
d) 14m/s

(b) 20m/s

Q5. What is the ratio of velocities of a nucleus that splits into two parts with radii 1:2 ?
a) 6:1
b) 2:1
c) 8:1
d) 4:1

(c) 8:1

Q6. When can one say that work is done on the body?
a) When the body experiences force
b) When there is an increase in energy because of mechanical influence
c) When the body moves a certain distance
d) None of the above

(b) When there is an increase in energy because of mechanical influence

Q7. Calculate the energy loss in a perfectly inelastic collision if the mass of the object is 40kg with velocity 4m/s hits the object of mass 60kg with velocity 2m/s.
a) 440J
b) 110J
c) 392J
d) 48J

(d) 48J

Q8. What is the power of the engine when the velocity of the car is v, mass m, acceleration a, and external resistance R ?
a) (R-ma)v
b) (R+ma)v
c) mav
d) Rv

(b) (R+ma)v

Q9. Calculate the final kinetic energy of a block of mass if the mass of the block is 10kg and has a constant velocity of 10m/s. The block of mass is subjected to a retarding force of F=0.1J/m.
a) 275J
b) 250J
c) 475J
d) 450J

(c) 475J  