MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A body moving with a constant velocity on normal ground initially has an energy of 1000 J. If the final energy is 800 J, what is the work done and which force causes this work? |
| A. | 200 J, gravity |
| B. | -200 J, friction |
| C. | 200 J, friction |
| D. | -200 J, gravity |
| Answer» C. 200 J, friction | |
| 2. |
A body of mass 2 Kg, initially at rest, moves under the influence of an external force of magnitude 4 N on plane ground. What is the work done by the force and the change in kinetic energy in the first 10 seconds? |
| A. | 400 J, 400 J |
| B. | -400 J, 400 J |
| C. | 400 J, -400 J |
| D. | -400 J, -400 J |
| Answer» B. -400 J, 400 J | |
| 3. |
The total energy of a system moving under the action of a conservative force changes by 50 J. Which of the following statements are correct with regards to the amount of work done? |
| A. | Amount of work done = 50 J |
| B. | Amount of work done < 50 J |
| C. | Amount of work done > 50 J |
| D. | Amount of work done <= 50 J |
| Answer» B. Amount of work done < 50 J | |
| 4. |
A body having 7 kg of mass moves slowly and covers a vertical height of 14 m. What is the work done in Joules and what force causes this work? Take g = 10 m/s2. |
| A. | 980, gravity |
| B. | 980, force acting opposite to gravity |
| C. | 1000, gravity |
| D. | 1000, force acting opposite to gravity |
| Answer» B. 980, force acting opposite to gravity | |
| 5. |
A projectile has both change in kinetic and potential energy. Still the work done calculated between any two points is zero. This is due to _________ |
| A. | Presence of no external force |
| B. | No displacement |
| C. | The displacement being in both vertical and horizontal directions |
| D. | Inter-conversion of kinetic and potential energies |
| Answer» E. | |
| 6. |
A body having 7 kg of mass moves with a velocity of 20 m/s covers a vertical height of 8.75 m. What is the work done by the moving force in Joules? Take g = 10 m/s2. |
| A. | 0 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» B. 10 | |
| 7. |
The change in the total energy of a body moving because of work being done on it is attributed by the change in kinetic energy only when ______ |
| A. | It moves extremely slowly |
| B. | It moves with a very high velocity |
| C. | It moves on an equipotential surface |
| D. | It moves with a positive acceleration |
| Answer» D. It moves with a positive acceleration | |
| 8. |
The total energy change of a body which covers a vertical height is constituted completely by the potential energy change only when ______ |
| A. | It moves slowly |
| B. | It moves quickly |
| C. | It moves for some time, then rests, then moves again |
| D. | It moves with a decreasing velocity |
| Answer» B. It moves quickly | |
| 9. |
The work done by a body while covering a vertical height of 5m is 50 kJ. By how much amount has the energy of the body changed? |
| A. | 50 kJ |
| B. | -50 kJ |
| C. | 25 kJ |
| D. | 10 kJ |
| Answer» B. -50 kJ | |
| 10. |
According to the work-energy theorem, total change in energy is equal to the _______ |
| A. | Total work done |
| B. | Half of the total work done |
| C. | Total work done added with frictional losses |
| D. | Square of the total work done |
| Answer» B. Half of the total work done | |