Q. No.One mole of a gas is undergoing following process, in which of the following work done by the gas is maximum?
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Subtopic: ย First Law of Thermodynamics |
ย 67%
Level 2: 60%+
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For the following change:
\(\begin{aligned} & \mathrm{H}_2 \mathrm{O}(\ell) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{~g}) \\ & 5^{\circ} \mathrm{C} \quad 100^{\circ} \mathrm{C} \end{aligned}\)
Choose the correct answer:
1. \( \mathrm{q}=+\mathrm{ve}, \mathrm{w}=+\mathrm{ve}, \Delta \mathrm{U}=+\mathrm{ve} \)
2. \( \mathrm{q}=-\mathrm{ve}, \mathrm{w}=-\mathrm{ve}, \Delta \mathrm{U}=+\mathrm{ve} \)
3. \(\mathrm{q}=+\mathrm{ve}, \mathrm{w}=-\mathrm{ve}, \Delta \mathrm{U}=+\mathrm{ve} \)
4. \( \mathrm{q}=-\mathrm{ve}, \mathrm{w}=-\mathrm{ve}, \Delta \mathrm{U}=-\mathrm{ve}\)
\(\begin{aligned} & \mathrm{H}_2 \mathrm{O}(\ell) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{~g}) \\ & 5^{\circ} \mathrm{C} \quad 100^{\circ} \mathrm{C} \end{aligned}\)
Choose the correct answer:
1. \( \mathrm{q}=+\mathrm{ve}, \mathrm{w}=+\mathrm{ve}, \Delta \mathrm{U}=+\mathrm{ve} \)
2. \( \mathrm{q}=-\mathrm{ve}, \mathrm{w}=-\mathrm{ve}, \Delta \mathrm{U}=+\mathrm{ve} \)
3. \(\mathrm{q}=+\mathrm{ve}, \mathrm{w}=-\mathrm{ve}, \Delta \mathrm{U}=+\mathrm{ve} \)
4. \( \mathrm{q}=-\mathrm{ve}, \mathrm{w}=-\mathrm{ve}, \Delta \mathrm{U}=-\mathrm{ve}\)
Subtopic: ย Thermodynamics' Properties and process |ย First Law of Thermodynamics |
ย 59%
Level 3: 35%-60%
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Find out the magnitude of work done in the process \(\mathrm{ABCD}\) (in \(\text{kJ}\)):
\(\mathrm{(1~atm~Lit=101.3~J)}\)
\(\mathrm{(1~atm~Lit=101.3~J)}\)
| 1. | 304 | 2. | 324 |
| 3. | 360 | 4. | 388 |
Subtopic: ย First Law of Thermodynamics |
ย 84%
Level 1: 80%+
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One mole of an ideal gas expands from \(10 ~\mathrm{dm}^3\) to \(20 ~\mathrm{dm}^3\) through isothermal reversible process. Find \(\Delta U, q \) & \(w\):
| 1. | \(\Delta U=0, q=0, w=0\) | 2. | \(\Delta U=0, q \neq 0, w \neq 0\) |
| 3. | \(\Delta \mathrm{U} \neq 0, \mathrm{q}=0, \mathrm{w} \neq 0\) | 4. | \(\Delta U \neq 0, q \neq 0, w=0\) |
Subtopic: ย First Law of Thermodynamics |
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Level 2: 60%+
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Which of the following statement(s) is/are correct for the adiabatic process?
1. (A) and (C)
2. (B) and (C)
3. (A) and (D)
4. (B) and (D)
| (A) | Molar heat capacity is zero. |
| (B) | Molar heat capacity is infinite. |
| (C) | Work done on gas is equal to the increase in internal energy. |
| (D) | The increase in temperature results in a decrease in internal energy. |
1. (A) and (C)
2. (B) and (C)
3. (A) and (D)
4. (B) and (D)
Subtopic: ย First Law of Thermodynamics |
ย 73%
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Find out work done on the gas for following process :
1. \(61.5 \text { Joule }\)
2. \(-61.5 \text { Joule }\)
3. \(\text { +246 Joule }\)
4. \(\text { -246 Joule }\)
1. \(61.5 \text { Joule }\)
2. \(-61.5 \text { Joule }\)
3. \(\text { +246 Joule }\)
4. \(\text { -246 Joule }\)
Subtopic: ย First Law of Thermodynamics |
ย 70%
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Calculate the magnitude of heat (q) in joules for an isothermal irreversible expansion, where the system expands against an external pressure of 8 bar, and the volume increases by 10 L.
| 1. | 8000 J | 2. | 2000 J |
| 3. | 6000 J | 4. | 7600 J |
Subtopic: ย First Law of Thermodynamics |
ย 89%
Level 1: 80%+
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Calculate the magnitude of work done on the gas at \(18^{\circ} \mathrm{C}\) ,when 1 mole of an ideal gas undergoes compression from 9 litre to 1 litre through a reversible isothermal process:
(Take log3 = 0.48)
1. 5349 J
2. 1789 J
3. 8902 J
4. 7690 J
(Take log3 = 0.48)
1. 5349 J
2. 1789 J
3. 8902 J
4. 7690 J
Subtopic: ย First Law of Thermodynamics |
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A 1 mol ideal gas expands from 10 L to 100 L at 300 K, If the above expansion takes place reversibly and isothermally, then the magnitude of work done is:
1. 6 KJ
2. 9 KJ
3. 4 KJ
4. 5 KJ
1. 6 KJ
2. 9 KJ
3. 4 KJ
4. 5 KJ
Subtopic: ย First Law of Thermodynamics |
ย 80%
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Which of the following is correct for adiabatic free expansion against vacuum?
1. \(\mathrm{q}=0, \Delta \mathrm{U}=0, \mathrm{~W}=0\)
2. \(\mathrm{q} \neq 0, \mathrm{~W}=0, \Delta \mathrm{U}=0\)
3. \(\mathrm{q}=0, \Delta \mathrm{U} \neq 0, \mathrm{~W}=0\)
4. \(q=0, \Delta U \neq 0, W \neq 0\)
1. \(\mathrm{q}=0, \Delta \mathrm{U}=0, \mathrm{~W}=0\)
2. \(\mathrm{q} \neq 0, \mathrm{~W}=0, \Delta \mathrm{U}=0\)
3. \(\mathrm{q}=0, \Delta \mathrm{U} \neq 0, \mathrm{~W}=0\)
4. \(q=0, \Delta U \neq 0, W \neq 0\)
Subtopic: ย First Law of Thermodynamics |
ย 92%
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