# Physics Quiz on Work Energy and Power for IIT JEE, NEET, Medical & Engineering Exam

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## Physics Quiz on Work Energy and Power

Physics Quiz on Work Energy and Power : Previous trends reveal that NEET 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 Physics quiz on work energy and power.

## Physics Quiz on Work Energy and Power

1. 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

2. What is the relation between E, P, and E if E is kinetic energy, P is momentum, and V is the velocity of the particle

(a) P=dVdt

(b) P=dEdt

(c) P=dEdV×dEdt

(d) P=dEdV

(d) P=dEdV

3. 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

4. Consider a particle of mass m which is driven by a machine that has a constant power k Watts. What is the force on the particle at time t if the particle starts from the rest?

(a) 2mk−−−−√t−12

(b) 12mk−−−√t−12

(c) mk−−−√t−12

(d) mk2−−−√t−12

(d) mk2−−−√t−12

5. Consider an object with m as its mass such that it is accelerated uniformly from rest and the speed attained by the object is v in T time. Calculate the instantaneous power that is delivered to the body in terms of function of time

(a) 12mv2T2t

(b) 12mv2T2t2

(c) mv2T2t

(d) mv2T2t2

(b) 12mv2T2t2

6. By how much does kinetic energy increase if the momentum is increased by 20%

(a) 55%

(b) 66%

(c) 44%

(d) 77%

(c) 44%15

7. 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

8. 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

9. 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

10. 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

Thank You.