MCQOPTIONS
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MCQOPTIONS
This section includes 29 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. |
During constant temperature, we feel colder on the day when the humidity is ___________ |
| A. | 85% |
| B. | 40% |
| C. | 60% |
| D. | 25% |
| Answer» E. | |
| 2. |
The triple point of water is ___________ |
| A. | 273.16°C |
| B. | 273.16K |
| C. | 273.16°F |
| D. | 0.15K |
| Answer» C. 273.16°F | |
| 3. |
A black body at 200 K is found to emit maximum energy at a wavelength 14μm. When its temperature is raised to 1000K, then wavelength at which maximum energy emitted it? |
| A. | 14mm |
| B. | 7μm |
| C. | 2.8μm |
| D. | 28mm |
| Answer» D. 28mm | |
| 4. |
A black body radiates energy at the rate of 1×105 J/(sm)2 at a temperature of 227°C. The temperature to which it must be heated so that it radiates energy at the rate of 1×109 J/(sm)2. |
| A. | 5000 K |
| B. | 5000°C |
| C. | 500 K |
| D. | 500°C |
| Answer» B. 5000°C | |
| 5. |
A perfectly black body is one whose ___________ |
| A. | Absorptive power is 1 |
| B. | Absorptive power is 0 |
| C. | Emissive power is 1 |
| D. | Absorptive power is 0.5 |
| Answer» B. Absorptive power is 0 | |
| 6. |
Mud houses are cooler in summer and warmer in winter because ___________ |
| A. | Mud is a good conductor of heat |
| B. | Mud is a superconductor of heat |
| C. | Mud is a bad conductor of heat |
| D. | Mud can adapt according to temperature |
| Answer» D. Mud can adapt according to temperature | |
| 7. |
Two rods having thermal conductivity in the ratio of 5:3 having equal lengths and equal cross-sectional area are joined end to end. If the temperature of the free end of the first rod is 100°C and free end of the second rod is 20°C, then the temperature of the junction is? |
| A. | 50°C |
| B. | 70°C |
| C. | 60°C |
| D. | 90°C |
| Answer» C. 60°C | |
| 8. |
A body A of mass 0.5kg and specific heat 0.85 is at a temperature of 60°C. Another body B of mass 0.3kg and specific heat 0.9 is at a temperature of 90°C. When they are connected to a conducting rod, heat will flow from ___________ |
| A. | A to B |
| B. | Heat can’t flow |
| C. | B to A |
| D. | First A to B and then B to A |
| Answer» D. First A to B and then B to A | |
| 9. |
If the temperature of a rod is increased by 10°C, its length increases by 1%. What is the percentage change in volume of the body of the same material for 10°C increase in temperature? |
| A. | 9% |
| B. | 1% |
| C. | 5% |
| D. | 3% |
| Answer» E. | |
| 10. |
Amount of heat required to raise the temperature of a body through 1K is called ___________ |
| A. | Specific heat |
| B. | Thermal capacity |
| C. | Water equivalent |
| D. | Entropy |
| Answer» C. Water equivalent | |
| 11. |
The coefficient of volumetric expansion of mercury is 18×10-5/°C. The thermometer bulb has a volume of 10-6 m3 and cross-section of the stem is 0.002cm2. Assuming that bulb is filled with mercury at 0°C, the increase in length of the mercury column at 100°C will be ___________ |
| A. | 9cm |
| B. | 9mm |
| C. | 18cm |
| D. | 18mm |
| Answer» B. 9mm | |
| 12. |
Density of substance at 0°C is g/cc and 100°C, its density is 9.7g/cc. The coefficient of linear expansion of the substance is? |
| A. | 10-1 |
| B. | 10-2 |
| C. | 10-3 |
| D. | 10-4 |
| Answer» E. | |
| 13. |
The volume of a gas at 20°C is 100cm3 at normal pressure. If it is heated to 100°C, its volume becomes 125cm3 at the same pressure, then volume coefficients of the gas (at normal pressure) is? |
| A. | 0.0033/°C |
| B. | 0.0025/°C |
| C. | 0.0030/°C |
| D. | 0.0021/°C |
| E. | is?a) 0.0033/°Cb) 0.0025/°Cc) 0.0030/°Cd) 0.0021/°C |
| Answer» B. 0.0025/°C | |
| 14. |
At which temperature, the centigrade and Fahrenheit scales are equally? |
| A. | 40° |
| B. | -40° |
| C. | 37° |
| D. | -80° |
| Answer» C. 37° | |
| 15. |
TWO_RODS_HAVING_THERMAL_CONDUCTIVITY_IN_THE_RATIO_OF_5:3_HAVING_EQUAL_LENGTHS_AND_EQUAL_CROSS-SECTIONAL_AREA_ARE_JOINED_END_TO_END._IF_THE_TEMPERATURE_OF_THE_FREE_END_OF_THE_FIRST_ROD_IS_100¬¨ àûC_AND_FREE_END_OF_THE_SECOND_ROD_IS_20¬¨ àûC,_THEN_THE_TEMPERATURE_OF_THE_JUNCTION_IS?$# |
| A. | 50°C |
| B. | 70°C |
| C. | 60°C |
| D. | 90°C |
| Answer» C. 60¬¨¬®‚Äö√†√ªC | |
| 16. |
A perfectly black body is one whose$ |
| A. | Absorptive power is 1 |
| B. | Absorptive power is 0 |
| C. | Emissive power is 1 |
| D. | Absorptive power is 0.5 |
| Answer» B. Absorptive power is 0 | |
| 17. |
Mud_houses_are_cooler_in_summer_and_warmer_in_winter_because |
| A. | Mud is a good conductor of heat |
| B. | Mud is a superconductor of heat |
| C. | Mud is a bad conductor of heat |
| D. | Mud can adapt according to temperature |
| Answer» D. Mud can adapt according to temperature | |
| 18. |
During constant temperature, we feel colder on the day when the humidity is |
| A. | 85% |
| B. | 40% |
| C. | 60% |
| D. | 25% |
| Answer» E. | |
| 19. |
The triple point of water is |
| A. | 273.16°C |
| B. | 273.16K |
| C. | 273.16°F |
| D. | 0.15K |
| Answer» C. 273.16¬¨¬®‚Äö√†√ªF | |
| 20. |
A black body at 200 K is found to emit maximum energy at a wavelength 14μm. When its temperature is raised to 1000K, then wavelength at which maximum energy emitted it$ |
| A. | 14mm |
| B. | 7μm |
| C. | 2.8μm |
| D. | 28mm |
| Answer» D. 28mm | |
| 21. |
A_black_body_radiates_energy_at_the_rate_of_1×105_J/(sm)2_at_a_temperature_of_227°C._The_temperature_to_which_it_must_be_heated_so_that_it_radiates_energy_at_the_rate_of_1×109_J/(sm)2$ |
| A. | 5000 K |
| B. | 5000°C |
| C. | 500 K |
| D. | 500°C |
| Answer» B. 5000¬¨¬®‚Äö√†√ªC | |
| 22. |
A body A of mass 0.5kg and specific heat 0.85 is at a temperature of 60°C. Another body B of mass 0.3kg and specific heat 0.9 is at a temperature of 90°C. When they are connected to a conducting rod, heat will flow fro?# |
| A. | A to B |
| B. | Heat can’t flow |
| C. | B to A |
| D. | First A to B and then B to A |
| Answer» D. First A to B and then B to A | |
| 23. |
In order that the heat flows from one part of a solid to another part, what is required? |
| A. | Uniform density |
| B. | Temperature gradient |
| C. | Density gradient |
| D. | Uniform temperature |
| Answer» C. Density gradient | |
| 24. |
If the temperature of a rod is increased by 10°C, its length increases by 1%. What is the percentage change in volume of the body of the same material for 10°C increase in temperature?$ |
| A. | 9% |
| B. | 1% |
| C. | 5% |
| D. | 3% |
| Answer» E. | |
| 25. |
Amount of heat required to raise the temperature of a body through 1K is called |
| A. | Specific heat |
| B. | Thermal capacity |
| C. | Water equivalent |
| D. | Entropy |
| Answer» C. Water equivalent | |
| 26. |
The coefficient of volumetric expansion of mercury is 18×10-5/°C. The thermometer bulb has a volume of 10-6 m3 and cross-section of the stem is 0.002cm2. Assuming that bulb is filled with mercury at 0°C, the increase in length of the mercury column at 100°C will be$ |
| A. | 9cm |
| B. | 9mm |
| C. | 18cm |
| D. | 18mm |
| Answer» B. 9mm | |
| 27. |
Density of substance at 0°C is g/cc and 100°C, its density is 9.7g/cc. The coefficient of linear expansion of the substance is$ |
| A. | 10<sup>-1</sup> |
| B. | 10<sup>-2</sup> |
| C. | 10<sup>-3</sup> |
| D. | 10<sup>-4</sup> |
| Answer» E. | |
| 28. |
The volume of a gas at 20°C is 100cm3 at normal pressure. If it is heated to 100°C, its volume becomes 125cm3 at the same pressure, then volume coefficients of the gas (at normal pressure) is$ |
| A. | 0.0033/°C |
| B. | 0.0025/°C |
| C. | 0.0030/°C |
| D. | 0.0021/°C |
| Answer» B. 0.0025/¬¨¬®‚Äö√†√ªC | |
| 29. |
At which temperature, the centigrade and Fahrenheit scales are equally? |
| A. | 40° |
| B. | -40° |
| C. | 37° |
| D. | -80° |
| Answer» C. 37¬¨¬®‚Äö√†√ª | |