MCQOPTIONS
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MCQOPTIONS
This section includes 8 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 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 | |
| 2. |
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 | |
| 3. |
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 | |
| 4. |
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 | |
| 5. |
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. | |
| 6. |
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 | |
| 7. |
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. | |
| 8. |
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/°C | |