Find out the total heat given to diatomic gas in the process ABC : (BC is isothermal)
1.
2.
3.
4. 3
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The efficiency of a Carnot engine is 40% when it receives energy at 500 K. At what temperature it should receive energy to increase its efficiency by 25% ?
1. | 600 K | 2. | 700 K |
3. | 800 K | 4. | 900 K |
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When a bicycle tyre suddenly bursts, the air inside the tyre expands. This process is:
1. | isothermal | 2. | adiabatic |
3. | isobaric | 4. | isochoric |
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Two cylinders, A and B, of equal capacity are connected to each other via a stopcock. A contains gas at a standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. If the stopcock is suddenly opened, then the change in internal energy of the gas is:
1. | 0
|
2. | 5 J
|
3. | 1 J
|
4. | 3 J |
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Which of the following is true for the molar heat capacity of an ideal gas?
1. | It cannot be negative. |
2. | It has only two values \(\left(C_P \text { and } C_V\right)\). |
3. | It can have any value. |
4. | It cannot be zero. |
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0.04 mole of an ideal monatomic gas is allowed to expand adiabatically so that its temperature changes from 800 K to 500 K. The work done during expansion is nearly equal to:
1. | \(129.6\) J | 2. | \(-129.6\) J |
3. | \(149.6\) J | 4. | \(-149.6\) J |
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A refrigerator whose coefficient of performance is 5 extracts heat from the cooling chamber at a rate of 250 J per cycle. For refrigeration, the work done per cycle is:
1. 150 J
2. 200 J
3. 100 J
4. 50 J
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The internal energy of an ideal gas increases in:
1. Adiabatic expansion
2. Adiabatic compression
3. Isothermal expansion
4. Isothermal compression
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If an ideal gas undergoes two processes at constant volumes as shown in the pressure-temperature (P-T) diagram, then:
1. =
2. >
3. <
4.
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A heat engine is working between 200 K and 400 K. The efficiency of the heat engine may be:
1. 20%
2. 40%
3. 50%
4. All of these
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