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Q. No.An ideal monatomic gas and a diatomic gas, both undergo adiabatic expansion starting from the same point on the \(P\)-\(V\) (indicator) diagram. The gases also undergo isothermal expansion. The curves are given by \(a,b,c.\) Which of the following is correct?
1.
\(a\)–isothermal, \(b\)–monatomic adiabatic, \(c\)–diatomic adiabatic
2.
\(a\)–monatomic adiabatic, \(b\)–diatomic adiabatic, \(c\)–isothermal
3.
\(a\)–diatomic adiabatic, \(b\)–monatomic adiabatic, \(c\)–isothermal
4.
\(a\)–isothermal, \(b\)–diatomic adiabatic, \(c\)–monatomic adiabatic
Subtopic: Types of Processes |
57%
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If \(\Delta Q\) is the heat flowing out of a system, \(\Delta W\) is the work done by the system on its surroundings, and \(\Delta U\) is the decrease in internal energy of the system, then the first law of thermodynamics can be stated as:
| 1. | \(\Delta Q=\Delta U+\Delta W\) |
| 2. | \(\Delta U=\Delta Q+\Delta W\) |
| 3. | \(\Delta U=\Delta Q-\Delta W\) |
| 4. | \(\Delta U+\Delta Q+\Delta W=0\) |
Subtopic: First Law of Thermodynamics |
59%
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Given below are two statements:
| Statement I: | The efficiency of any thermodynamic engine can approach \(100\%\) if friction and all dissipative processes are reduced. |
| Statement II: | The first law of thermodynamics is applicable only to non-living systems. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Second Law of Thermodynamics |
54%
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If the volume of an ideal gas is doubled, isothermally, the final pressure is \(1\) atm. If the process was adiabatic, the pressure would have been:
1. \(1\) atm
2. \(0.5\) atm
3. less than \(1\) atm
4. greater than \(1\) atm
1. \(1\) atm
2. \(0.5\) atm
3. less than \(1\) atm
4. greater than \(1\) atm
Subtopic: Types of Processes |
60%
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A thermodynamic process involving a system takes place with \(100\) J of heat being rejected to the environment and an increase of \(20\) J of internal energy. Then,
| 1. | work done by the system is \(120\) J. |
| 2. | work done on the system is \(120\) J. |
| 3. | work done by the system is \(80\) J. |
| 4. | work done on the system is \(80\) J. |
Subtopic: First Law of Thermodynamics |
67%
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Given below are two statements:
| Statement I: | If an ideal gas expands without any heat being supplied to it, then its temperature does not change. |
| Statement II: | If an ideal gas expands freely without any heat being supplied to it, then its internal energy remains unchanged. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Types of Processes |
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An ideal mono-atomic gas undergoes an expansion, keeping its temperature constant, but its volume increases two-fold. The same amount (number of moles) of a diatomic gas undergoes the same process. If the heat supplied in the first case be \(Q_1\) and in the second be \(Q_2,\) then:
| 1. | \(Q_1=Q_2\) | 2. | \(5Q_1=3Q_2\) |
| 3. | \(Q_1=2Q_2\) | 4. | \(Q_2=2Q_1\) |
Subtopic: Types of Processes |
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A gas \((\gamma = 1.5)\) undergoes a process in which its volume is doubled, but the speed of sound in the gas remains unchanged. Then,
| 1. | the pressure is halved |
| 2. | the pressure decreases by a factor of \(2\sqrt 2\) |
| 3. | the temperature is halved |
| 4. | the temperature decreases by a factor of \(2 \sqrt 2\) |
Subtopic: Types of Processes |
50%
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An ideal gas forms the working substance of a Carnot engine, and is taken around the Carnot cycle. We form the integral: \(I=\int\dfrac{dQ}{T},\)
where \(dQ\) is the heat supplied to the gas and \(T\) is the temperature of the gas. The integral is evaluated over the entire cycle. The value of the integral \(I\) is:
where \(dQ\) is the heat supplied to the gas and \(T\) is the temperature of the gas. The integral is evaluated over the entire cycle. The value of the integral \(I\) is:
| 1. | zero |
| 2. | negative |
| 3. | positive |
| 4. | non-negative(positive or zero) |
Subtopic: Carnot Engine |
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The pressure of an ideal gas \(\left(\gamma=\dfrac32\right)\) is increased by \(1\%\) in an adiabatic process. The temperature of the gas:
| 1. | increases by \(1.5\%\) |
| 2. | decreases by \(1.5\%\) |
| 3. | increases by \(\frac13\%\) |
| 4. | increases by \(\frac23\%\) |
Subtopic: Types of Processes |
61%
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