MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The force required to tow a vehicle at constant velocity is directly proportional to the magnitude of velocity raised to the first power. It requires 1000 W to tow with a velocity of 10 m/s. How much power is required to tow at a velocity of 8 m/s? |
| A. | 320 W |
| B. | 640 W |
| C. | 160 W |
| D. | 80 W |
| Answer» C. 160 W | |
| 2. |
A body of mass 3 kg starts from rest with a uniform acceleration of unknown magnitude. If the body has a velocity of 30 m/s in 6 seconds, what is the power consumed in 3 seconds? |
| A. | 125 W |
| B. | 225 W |
| C. | 325 W |
| D. | 425 W |
| Answer» C. 325 W | |
| 3. |
A 200 kg wagon climbs up a hill of slope 30-degrees in 1 minute at a speed of 36 km/h. How much power is delivered by the engine if the frictional force is 25% of the weight of the car? (Assume g = 10m/s2) |
| A. | 25 kW |
| B. | 50 kW |
| C. | 100 kW |
| D. | 125 kW |
| Answer» B. 50 kW | |
| 4. |
A 200 kg wagon climbs up a hill of slope 30-degrees in 1 minute at a speed of 10 m/s. How much power is delivered by the engine? (Assume g = 10m/s2) |
| A. | 10 kW |
| B. | 20 kW |
| C. | 30 kW |
| D. | 40 kW |
| Answer» C. 30 kW | |
| 5. |
1000 kW of power is supplied to a motor. 90% of this is transmitted to a machine operating at 80% efficiency. The machine lifts an object of 10-tons with a velocity _____ m/s. (Assume g = 10m/s2) |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 6. |
A 2-ton vehicle travels at 20m/s on a road where the frictional force is 10% of the weight of the vehicle. What is the power required? (Assume g = 10m/s2) |
| A. | 220 kW |
| B. | 240 kW |
| C. | 420 kW |
| D. | 440 kW |
| Answer» E. | |
| 7. |
A machine has a power of 20kW. How long will it take for it to lift a body of mass 10kg from the ground to a height of 100m? (Assume g = 10m/s2) |
| A. | 1 second |
| B. | 2 seconds |
| C. | 3 seconds |
| D. | 4 seconds |
| Answer» C. 3 seconds | |
| 8. |
A motor is used to pump water from a depth of 5 m to fill a volume of 10 cubic meters in 5 minutes. If 50% of the power is wasted, what is the power of the motor? (Assume g = 10m/s2) |
| A. | 1000/3 W |
| B. | 3000/3 W |
| C. | 5000/3 W |
| D. | 10000/3 W |
| Answer» E. | |
| 9. |
A motor is used to deliver water through a pipe. Let the motor have a power P initially. To double the rate of flow of water through the pipe, the power is increased to P . What is the value of P /P? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 10. |
A machine gun fires 360 bullets per minute. Each bullet has a mass of 5 grams and travels at 600 m/s. What is the power of the gun? (Assume no loss of energy and 100% power transmission) |
| A. | 300 W |
| B. | 600 W |
| C. | 900 W |
| D. | 1800 W |
| Answer» D. 1800 W | |
| 11. |
What are the units of power? |
| A. | Newton |
| B. | Joule |
| C. | Watt |
| D. | No units |
| Answer» D. No units | |