MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A black body is at 727°C. It emits energy at a rate, which is proportional to ___________ |
| A. | (727)2 |
| B. | (1000)2 |
| C. | (727)4 |
| D. | (1000)4 |
| Answer» E. | |
| 2. |
A beaker full of hot water is kept in a room. If it cools from 80°C to 75°C in t1 minutes, from 75°C to 70°C in t2 minutes and from 70°C to 65°C in t3 minutes, then ___________ |
| A. | t1=t2=t3 |
| B. | t1 < t2 = t3 |
| C. | t1 < t2 < t3 |
| D. | t1 > t2 > t3 |
| Answer» D. t1 > t2 > t3 | |
| 3. |
A centigrade and Fahrenheit thermometers are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 140°. What is the fall in temperature registered by the centigrade thermometer? |
| A. | 80°C |
| B. | 60°C |
| C. | 360°C |
| D. | 30°C |
| Answer» D. 30°C | |
| 4. |
Assertion: Good conductors of heat are also good conductors of electricity and vice-versa. |
| A. | Reasons: Mainly electrons are responsible for these conductors. |
| B. | Both assertion and reason are true and the reason is the correct explanation of the assertion |
| C. | Both assertion and reason are true but the reason is not a correct explanation of the assertion |
| D. | Assertion is true but the reason is false |
| E. | Both assertion and reason are false |
| Answer» B. Both assertion and reason are true and the reason is the correct explanation of the assertion | |
| 5. |
A black body at a high temperature T K radiates energy at the rate of E Wm-2. When the temperature falls to T/2 K, the radiated energy will be ___________ |
| A. | E/4 |
| B. | E/2 |
| C. | 2E |
| D. | E/16 |
| Answer» E. | |