XI Physics Work Power And Energy Online Test Mdcat-2024

Instructions for Chapter Work Power And Energy Online Test Mdcat-2024:

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Test Details:

Subject: Physics
Class: 1st year or 11
Chapter name: Work Power And Energy
Test: MDCAT 2024
Book: Sindh Textbook
Total No. Of MCQS: 50
Time Allowed: 60 Minutes
Price : Free

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Created on July 28, 2024 By

medicoengineer.com

XI Physics Work Power and Energy Online Test Mdcat-2024

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NameEmailPhone Number

1 / 50

1. Power is defined as:

a) The amount of force applied over a distance

b) The rate of doing work

c) The product of mass and velocity

d) The energy stored in an object due to its position

2 / 50

2. Two bodies of masses m₁, and m₂ have equal momentum their kinetic energies E₁ and E₂ are in the ratio:

a) √m₁: √m₂

b) m₁ : m₂

c) m₂ : m₁

d) (m₁²) : (m₂²)

3 / 50

3. The kinetic energy of a body becomes four times it initial value. The new linear momentum will be:

a) thrice the initial value

b) four times the initial value

c) same as the initial value

d) twice the initial value

4 / 50

4. Which of the following is incorrect?

a) Absolute gravitational PE is minimum at centre of earth

b) Absolute gravitational PE is negative at any finite distance

c) Absolute gravitational PE is zero on surface of earth

d) Actual PE is zero at infinite distance from centre of earth

5 / 50

5. When calculating work done by a variable force, the accuracy of the result increases, if:

a) Number of intervals becomes zero

b) Number of intervals decreases

c) Accuracy cannot be increased

d) Number of intervals increases

6 / 50

6. If a lighter body (mass M₁ and velocity V₁) and a heavier body (mass M₂ and velocity V₂) have the same kinetic energy, then

a) M₂V₂<M₁V₁

b) M₂V₂ = M₁V₁

c) M₂V₁ = M₁V₂

d) M₂V₂>M₁V₁

7 / 50

7. A force of 10 N is applied to push a block horizontally over a distance of 5 meters. How much work is done by the force?

a) 10 J

b) 20 J

c) 50 J

d) 100 J

8 / 50

8. The power of a pump, which can pump 200 kg of water to a height of 200 m in 10 sec is:

a) 900 kW

b) 400 kW

c) 80 kW

d) 40 kW

9 / 50

9. A car accelerates uniformly from rest to a velocity of 20 m/s in 10 seconds. If the mass of the car is 1500 kg, what is the kinetic energy of the car at the end of 10 seconds?

a) 150,000 J

b) 300,000 J

c) 450,000 J

d) 600,000 J

10 / 50

10. A crane lifts a 500 kg load to a height of 20 meters in 25 seconds. What is the average power output of the crane? (Assume g = 9.8 m/s²)

a) 196 W

b) 392 W

c) 3,920 W

d) 4,900 W

11 / 50

11. A 60 W light bulb is used for 2 hours. How much energy does it consume in joules?

a) 120 J

b) 7200 J

c) 432,000 J

d) 4,320,000 J

12 / 50

12. Which of the following reactions emit more energy when performed at an equal rate?

a) Fusion reaction

b) Fission reaction

c) Both have the same energy

d) Can't be predicted

13 / 50

13. Work done against gravitational force is stored as:

a) Kinetic energy

b) Potential energy

c) Heat energy

d) Magnetic energy

14 / 50

14. Work done by a conservative force would be positive if:

a) Kinetic energy decreases

b) Potential energy decreases

c) Potential energy increases

d) No change in both KE and PE

15 / 50

15. Energy required to accelerate a car from 10 m/s to 20 m/s compared with that required to accelerate it from 0 m/s to 10 m/s is:

a) Two times

b) Three times

c) Four times

d) Same

16 / 50

16. A body of mass 2 kg is moving with a momentum of 2 Ns. Its kinetic energy would be:

a) 4 J

b) 3 J

c) 2 J

d) 1 J

17 / 50

17. The time taken by an engine of power 10 kW to lift a mass of 200 kg to a height of 40 meters is:

a) 2 sec

b) 4 sec

c) 6 sec

d) 8 sec

18 / 50

18. A light body A and a heavy body B have equal kinetic energy. Then:

a) A has larger momentum than B

b) B has larger momentum than A

c) A and B have the same momentum

d) Nothing can be predicted

19 / 50

19. Work done would be half of the maximum at the angle of:

a) 0°

b) 30°

c) 45°

d) 60°

20 / 50

20. If all the parametric expressions of kinetic energy are doubled, then the KE would be:

a) Two times

b) Four times

c) Eight times

d) Remain the same

21 / 50

21. An object possesses a KE that is numerically to its momentum. The speed of the object is:

a) 2 m/s

b) 1/2 m/s

c) √2 m/s

d) 4 m/s

22 / 50

22. Car X is traveling at half the speed of car Y. Car X has twice the mass of car Y. Which statement is correct?

a) Car X has half the kinetic energy of car Y

b) Car X has one quarter of the kinetic energy of car Y.

c) Car X has twice the kinetic energy of car Y.

d) The two cars have the same kinetic energy.

23 / 50

23. If the linear momentum of a body is increased by 14%, its kinetic energy increases by:

a) 12%

b) 20%

c) 30%

d) 36%

24 / 50

24. What is the difference between kinetic energy and potential energy?

a) Kinetic energy is the energy of motion, while potential energy is the energy of position

b) Kinetic energy is the energy of position, while potential energy is the energy of motion.

c) Kinetic energy is the energy of force, while potential energy is the energy of velocity.

d) Kinetic energy is the energy of velocity, while potential energy is the energy of force.

25 / 50

25. What is the difference between work and energy?

a) Work is the transfer of energy, while energy is the ability to do work

b) Work is the ability to do work, while energy is the transfer of work.

c) Work is the energy transferred, while energy is the work done.

d) Work is the energy done, while energy is the work transferred

26 / 50

26. An object has a kinetic energy of 8 J. What is its velocity if its mass is 4 kg?

a) 2 m/s

b) 4 m/s

c) 6 m/s

d) 8 m/s

27 / 50

27. What is the main relationship between power and energy?

a) Power is the rate at which energy is transferred

b) Power is the rate at which energy is converted

c) Power is the amount of energy transferred

d) Power is the amount of energy converted.

28 / 50

28. What is the difference between instantaneous power and average power?

a) Instantaneous power is the power at a given instant, while average power is the power over a period of time.

b) Instantaneous power is the power over a period of time, while average power is the power at a given instant

c) Instantaneous power is the maximum power, while average power is the minimum power.

d) Instantaneous power is the minimum power, while average power is the maximum power.

29 / 50

29. A stone is thrown up from the surface of the earth. When it reaches its maximum height, its K.E. is equal to:

a) 1/2 mv²

b) mgh

c) Zero

d) 2mgh

30 / 50

30. The input power to a motor is 1000 W. In 10 seconds, it lifts a load of 500 N through a height of 5.0 m. What is the efficiency of the motor?

a) 10%

b) 40%

c) 25%

d) 75%

31 / 50

31. The relation between horsepower and watt is:

a) 1 hp = 546 watts

b) 1 hp = 746 watts

c) 1 hp = 1000 watts

d) 1 hp = 946 watts

32 / 50

32. A worker takes 2 minutes to raise a box from the platform to a train. Another worker takes 1 minute. The work done:

a) By the first is more

b) By the first is less

c) Is same in both cases

d) Becomes 4 times in the first

33 / 50

33. Which of the following is correct?

a) Watt and watt-hour represent the same quantity

b) Watt represents energy and watt-hour represents force

c) Watt represents power and watt-hour represents energy

d) Watt represents force and watt-hour represents energy

34 / 50

34. If a body falls from a height, the relation between its kinetic and potential energies is:

a) Gain in K.E = (Loss in P.E) - (Work done against friction)

b) Gain in P.E = (Loss in K.E) + (Work done against friction)

c) Loss in K.E = (Gain in P.E) + (Work done against friction)

d) Loss in P.E = (Gain in K.E) - (Work done against friction)

35 / 50

35. The work done in a gravitational field is independent of:

a) Distance

b) Mass

c) Path

d) Potential energy

36 / 50

36. 1 British Thermal Unit is equal to:

a) 1055 J

b) 1100 J

c) 1609 J

d) 746 J

37 / 50

37. A stair that is 10m high contains 25 steps. How much work is needed per step while lifting a 50 kg body?

a) 100 J

b) 200 J

c) 400 J

d) 500 J

38 / 50

38. Which of the following forces acting on a body always performs zero work:

a) Frictional

b) Gravitational

c) Centripetal

d) Both C and D

39 / 50

39. A 50 kg car is moving along a road with a speed of 72 km/h. How much work is done by frictional force if the speed of the car is reduced to 36 km/h?

a) 300 J

b) 9000 J

c) 12000 J

d) 75000 J

40 / 50

40. Five bricks, each 10 cm thick and mass 1 kg, lie flat on table. How much work is required to stack them one on top of another (g = 10 m/s²)?

a) 1 J

b) 5 J

c) 10 J

d) 30 J

41 / 50

41. A boy holds a box of weight 100N, 5 meters above from the ground. The work done by boy is:

a) 0 J

b) 250 J

c) 500 J

d) 5000 J

42 / 50

42. The work done on a particle is equal to the change in its:

a) Kinetic energy

b) Potential energy

c) Magnetic energy

d) Both A and B

43 / 50

43. Work done by gravitational force and lifting force on a body being lifted upward is:

a) +ve, -ve

b) -ve, +ve

c) Zero, +ve

d) Maximum, minimum

44 / 50

44. Which of the following is/are the example of positive work?

I. work done by stretching force while stretching the spring.
II. work done by lifting force to lift body upward.
III. Work done by gravity when a body moves downward.
IV. Work done by normal reaction when body moves on a horizontally on surface.

a) I and II

b) I and III

c) I and IV

d) I, II and III

45 / 50

45. When a falling body hits the earth, its kinetic energy changes to:

a) Potential energy

b) Chemical energy

c) Sound & heat

d) Mechanical energy

46 / 50

46. If a car is moving on a straight road with constant speed, then:

a) Work is done against force of friction

b) Net work done on car is zero

c) Net work done may be zero

d) Both A and B

47 / 50

47. When two protons are brought closer:

a) The P.E. between them increases

b) The P.E. between them remains unchanged

c) The P.E. between them decreases

d) Their K.E. increases

48 / 50

48. According to the work-energy principle, work done on a body is equal to:

a) The difference of its final and initial momentum

b) The difference of its final and initial potential energies

c) The difference of its final and initial kinetic energies

d) The difference of its velocities

49 / 50

49. A body of mass 5 Kg initially at rest is moved by a force of 20 N on a smooth horizontal surface. Work done by the force in 10 sec is:

a) 40 J

b) 60 J

c) 80 J

d) 90 J

50 / 50

50. What is the force required to accelerate an object of mass 1 Kg from rest to a velocity of 4 m/s in the distance of 10 m:

a) 8 N

b) 4 N

c) 0.8 N

d) 0.4 N

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