Q. No.Consider the following statements:
Choose the correct combination of statements from the options given below:
1. \(\mathrm{C,D~\text{and}~E~\text{Only}}\)
2. \(\mathrm{A,B~\text{and}~C~\text{Only}}\)
3. \(\mathrm{A,B~\text{and}~D~\text{Only}}\)
4. \(\mathrm{B,C~\text{and}~D~\text{Only}}\)
| \(\mathrm{A.}\) | Zeroth law of thermodynamics gives concept of temperature |
| \(\mathrm{B.}\) | First law of thermodynamics gives concept of internal energy |
| \(\mathrm{C.}\) | In isothermal expansion of ideal gas, \(\Delta Q \neq \Delta W\) |
| \(\mathrm{D.}\) | Product of intensive and extensive variables is extensive |
| \(\mathrm{E.}\) | The ratio of any extensive variable to mass will be an extensive variable |
1. \(\mathrm{C,D~\text{and}~E~\text{Only}}\)
2. \(\mathrm{A,B~\text{and}~C~\text{Only}}\)
3. \(\mathrm{A,B~\text{and}~D~\text{Only}}\)
4. \(\mathrm{B,C~\text{and}~D~\text{Only}}\)
Subtopic: Β First Law of Thermodynamics |
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One mole of diatomic gas having rotational modes only is kept in a cylinder with a piston system. The cross-section area of the cylinder is \(4~\text{cm}^2\). The gas is heated slowly to raise the temperature by \(1.2^{\circ} \text{C}\)
(Atmospheric pressure\(=100~\text{kPa}, R=8.3~\text{J/mol K} \)
1. \(24.8\)
2. \(25\)
3. \(15.04\)
4. \(29.98\)
(Atmospheric pressure
1. \(24.8\)
2. \(25\)
3. \(15.04\)
4. \(29.98\)
Subtopic: Β First Law of Thermodynamics |
Level 4: Below 35%
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During the melting of a slab of ice at \(273~ \text{K}\) at atmospheric pressure:
| 1. | Positive work is done on the ice-water system by the atmosphere. |
| 2. | Internal energy of ice-water system remains unchanged. |
| 3. | Internal energy of the ice-water system decreases. |
| 4. | Positive work is done by the ice-water system on the atmosphere. |
Subtopic: Β First Law of Thermodynamics |
Level 4: Below 35%
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The net heat exchanged in the given cyclic process is:
1. \(81.5~\text J\)
2. \(61.5~\text J\)
3. \(100.2~ \text J\)
4. \(40.2 ~\text J\)
1. \(81.5~\text J\)
2. \(61.5~\text J\)
3. \(100.2~ \text J\)
4. \(40.2 ~\text J\)
Subtopic: Β First Law of Thermodynamics |
Β 77%
Level 2: 60%+
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When the amount of heat supplied to a gas in a system is equal to \(1000\) J, the system in return does \(200\) J of work on the surrounding. What would be the change in the internal energy of the gas?
1. \(800\) J
2. \(1200\) J
3. \(1000\) J
4. \(1100\) J
1. \(800\) J
2. \(1200\) J
3. \(1000\) J
4. \(1100\) J
Subtopic: Β First Law of Thermodynamics |
Β 76%
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A gas is compressed adiabatically. Which of the following statements is not correct?
| 1. | Internal energy is constant |
| 2. | Temperature increases |
| 3. | |Work done| = |change in internal energy| |
| 4. | Heat is not supplied to the system |
Subtopic: Β First Law of Thermodynamics |
Β 68%
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During an adiabatic process performed on a diatomic gas \(725\) J of work is done on the gas. The change in internal the energy of the gas is equal to:
1. \(495\) J
2. \(725\) J
3. \(225\) J
4. \(0\)
1. \(495\) J
2. \(725\) J
3. \(225\) J
4. \(0\)
Subtopic: Β First Law of Thermodynamics |
Β 90%
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The initial volume of \(1\) mole of a monoatomic gas is \(2\) litres. It is expanded isothermally to a volume of \(6\) litres. Change in internal energy of the gas is:
1. \(2R\)
2. \(4R\)
3. \(R\)
4. \(0\)
1. \(2R\)
2. \(4R\)
3. \(R\)
4. \(0\)
Subtopic: Β First Law of Thermodynamics |
Β 88%
Level 1: 80%+
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For a system undergoing an isothermal process, heat energy is supplied to the system. Then,
Choose the correct option from the given ones:
| I. | Internal energy will increase. |
| II. | Internal energy will decrease. |
| III. | Work done by the system is positive. |
| IV. | Work done by the system is negative. |
| V. | Internal energy remains constant. |
Choose the correct option from the given ones:
| 1. | (I), (III), and (V) only | 2. | (II) and (IV) only |
| 3. | (III) and (V) only | 4. | (I), (IV), and (V) only |
Subtopic: Β First Law of Thermodynamics |
Β 85%
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An electric appliance supplies \(6000~\text{ J/min}\) heat to the system. If the system delivers a power of \(90~\text W.\) How long it would take to increase the internal energy by \( 2.5 Γ 10^3~\text{J}?\)
1. \(4.1\times 10^{1}~\text{s}\)
2. \(2.4\times 10^{3}~\text{s}\)
3. \(2.5\times 10^{1}~\text{s}\)
4. \(2.5\times 10^{2}~\text{s}\)
1. \(4.1\times 10^{1}~\text{s}\)
2. \(2.4\times 10^{3}~\text{s}\)
3. \(2.5\times 10^{1}~\text{s}\)
4. \(2.5\times 10^{2}~\text{s}\)
Subtopic: Β First Law of Thermodynamics |
Β 64%
Level 2: 60%+
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