MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A Carnot engine, whose sink is at 300 K, has an efficiency of 40%. By how much should the temperature of source be increased, so as to increase the efficiency by 50% of original efficiency? |
| A. | 380 K |
| B. | 275 K |
| C. | 325 K |
| D. | 250 K |
| Answer» E. | |
| 2. |
The efficiency of a Carnot engine operating with reservoir temperatures kept at 100 C and -23 C will be ___________ |
| A. | (100+23)/100 |
| B. | (100-23)/100 |
| C. | (373+250)/373 |
| D. | (373-250)/373 |
| Answer» E. | |
| 3. |
Assertion: In an isolated system, the entropy increases.
|
| A. | Both assertion and reason are true and the reason is the correct explanation of the assertion |
| B. | Both assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | Assertion is true but the reason is false |
| D. | Both assertion and reason are false |
| Answer» C. Assertion is true but the reason is false | |
| 4. |
In an adiabatic process, the quantity which remains constant is ___________ |
| A. | Volume |
| B. | Pressure |
| C. | Temperature |
| D. | Total heat of the system |
| Answer» E. | |
| 5. |
If Cp and Cv are the specific heats for a gas at constant pressure and at constant volume respectively, then the relation Cp-Cv=R is exact for? |
| A. | Ideal and real gases at all pressures |
| B. | Ideal gas at all pressures and real gas at a moderate pressure |
| C. | Ideal gas and nearly true for real gases at high pressure |
| D. | Ideal gas and nearly true for real gases at a moderate pressure |
| Answer» E. | |
| 6. |
Out of solid, liquid and gas of the same mass and at the same temperature, which one has the least internal energy? |
| A. | Solid |
| B. | Liquid |
| C. | Gas |
| D. | All three have the same internal energy |
| Answer» B. Liquid | |
| 7. |
Air in a cylinder is suddenly compressed by a piston which is then maintained at the same position. After sometime, the ___________ |
| A. | Pressure will increase |
| B. | Pressure remains the same |
| C. | Pressure will decrease |
| D. | Pressure may increase or decrease |
| Answer» D. Pressure may increase or decrease | |