Can two isothermal curves cut each other? 1. Never 2. Yes 3. They will cut when the temperature is 0°C. 4. Yes, when the pressure is equal to the critical pressure.

Subtopic:  Types of Processes |
76%
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The latent heat of vaporisation of water is $$2240~\text{J/gm}$$. If the work done in the process of expansion of $$1~\text{g}$$ is $$168~\text{J}$$, then the increase in internal energy is:
1. $$2408~\text{J}$$
2. $$2240~\text{J}$$
3. $$2072~\text{J}$$
4. $$1904~\text{J}$$

Subtopic:  First Law of Thermodynamics |
82%
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An ideal gas at $$27^{\circ}\text{C}$$ is compressed adiabatically to $$\frac{8}{27}$$ of its original volume. If $$\gamma = \frac{5}{3},$$ then the rise in temperature will be:
1. $$450~\text{K}$$
2. $$375~\text{K}$$
3. $$225~\text{K}$$
4. $$405~\text{K}$$

Subtopic:  Types of Processes |
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A polyatomic gas $$\left(\gamma = \frac{4}{3}\right)$$ is compressed to $$\frac{1}{8}$$ of its volume adiabatically. If its initial pressure is $$P_0,$$ its new pressure will be:

 1 $$8P_0$$ 2 $$16P_0$$ 3 $$6P_0$$ 4 $$2P_0$$
Subtopic:  Types of Processes |
85%
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A unit mass of a liquid with volume V1 is completely changed into a gas of volume V2 at a constant external pressure P and temperature T. If the latent heat of evaporation for the given mass is L, then the increase in the internal energy of the system is:
1.  Zero
2. $P\left({V}_{2}-{V}_{1}\right)$
3. $L-P\left({V}_{2}-{V}_{1}\right)$
4.  L

Subtopic:  First Law of Thermodynamics |
63%
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An ideal heat engine (Carnot engine) working between temperatures $$T_1$$ and $$T_2$$ has an efficiency $$\eta.$$ The new efficiency if both the source and sink temperatures are doubled will be:
1. $$\frac{\eta}{2}$$
2. $$\eta$$
3. $$2\eta$$
4. $$3\eta$$
Subtopic:  Carnot Engine |
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A monoatomic ideal gas, initially at temperature $$T_1$$, is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature $$T_2$$ by releasing the piston suddenly. If $$L_1$$ and $$L_2$$ are the lengths of the gas column before and after expansion, respectively, then $$\frac{T_1}{T_2}$$ is given by:
1. $$\left(\frac{L_1}{L_2}\right)^{\frac{2}{3}}$$
2. $$\frac{L_1}{L_2}$$
3. $$\frac{L_2}{L_1}$$
4. $$\left(\frac{L_2}{L_1}\right)^{\frac{2}{3}}$$

Subtopic:  Types of Processes |
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An insulator container contains 4 moles of an ideal diatomic gas at a temperature T. If heat Q is supplied to this gas, due to which 2 moles of the gas are dissociated into atoms, but the temperature of the gas remains constant, then:
1. Q = 2RT
2. Q = RT
3. Q = 3RT
4. Q = 4RT

Subtopic:  First Law of Thermodynamics |
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The volume of air (diatomic) increases by $$5\%$$ in its adiabatical expansion. The percentage decrease in its pressure will be:

 1 $$5\%$$ 2 $$6\%$$ 3 $$7\%$$ 4 $$8\%$$
Subtopic:  Types of Processes |
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Two Carnot engines A and B are operated in succession. The first one, A receives heat from a source at $$T_1=800$$ K and rejects to sink at $$T_2$$ K. The second engine, B, receives heat rejected by the first engine and rejects to another sink at $$T_3=300$$ K. If the work outputs of the two engines are equal, then the value of $$T_2$$ will be:

 1 100 K 2 300 K 3 550 K 4 700 K
Subtopic:  Carnot Engine |
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