MCQOPTIONS
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MCQOPTIONS
This section includes 5 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 efficiency of a carnot engine is 50%. The temperature of the hot reservoir is kept constant. By what amount should the temperature of the cold reservoir be decreased so that efficiency becomes 60%. |
| A. | 1K |
| B. | 2K |
| C. | 30K |
| D. | 83K |
| Answer» B. 2K | |
| 2. |
A carnot engine extracts 1200J of energy from a hot reservoir. What is the amount of work done by it? Temperatures of hot and cold reservoirs are 200K and 150K respectively. |
| A. | 800J |
| B. | 900J |
| C. | 600J |
| D. | 850J |
| Answer» C. 600J | |
| 3. |
What will be the value of temperature of hot reservoir in a carnot cycle, if the temperature of cold reservoir is 25°C, heat absorbed from hot reservoir is 12J and heat rejected to cold reservoir is 4J? |
| A. | 684K |
| B. | 333.33K |
| C. | 894K |
| D. | 433.33K |
| Answer» D. 433.33K | |
| 4. |
What is the correct order of steps for a carnot cycle? |
| A. | Isothermal expansion, adiabatic expansion, isothermal compression, adiabatic compression |
| B. | Isothermal compression, adiabatic expansion, isothermal expansion, adiabatic compression |
| C. | Adiabatic compression, adiabatic expansion, isothermal expansion, isothermal compression |
| D. | Adiabatic compression, isothermal expansion, adiabatic expansion, isothermal compression |
| Answer» B. Isothermal compression, adiabatic expansion, isothermal expansion, adiabatic compression | |
| 5. |
Find work done by one mole of a gas in one cycle. V1 = 1m3, V2 = 4m3, V3 = 6m3, V4 =3m3. Temperature is given in °C. |
| A. | 303Rln(4) J |
| B. | 303Rln(2) J |
| C. | 30Rln(2) J |
| D. | 30Rln(4) J |
| Answer» C. 30Rln(2) J | |