# A gas is taken through the cycle $$A\rightarrow B\rightarrow C\rightarrow A$$, as shown. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> What is the total amount of work done by the gas?                 1. $$1000~\text{J}$$ 2. zero 3. $$-2000~\text{J}$$ 4. $$2000~\text{J}$$

Subtopic:  Work Done by a Gas |
74%
From NCERT
AIPMT - 2013
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A Carnot engine whose sink is at $$300~\mathrm{K}$$ has an efficiency of $$40$$%. By how much should the temperature of the source be increased to increase its efficiency by $$50$$% of its original efficiency?

 1 $$275~\mathrm{K}$$ 2 $$325~\mathrm{K}$$ 3 $$250~\mathrm{K}$$ 4 $$380~\mathrm{K}$$
Subtopic:  Carnot Engine |
64%
From NCERT
AIPMT - 2006
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

One mole of an ideal gas expands at a constant temperature of 300 K from an initial volume of 10 litres to a final volume of 20 litres. The work done in expanding the gas is equal to:
(R = 8.31 J/mole-K)

1. 750 joules

2. 1728 joules

3. 1500 joules

4. 3456 joules

Subtopic:  Work Done by a Gas |
73%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A thermodynamic system undergoes a cyclic process $$ABCDA$$ as shown in Fig. The work done by the system in the cycle is:

1. $$P_0 V_0$$
2. $$2 P_0 V_0$$
3. $$\frac{P_0 V_0}{2}$$
4. zero

Subtopic:  Cyclic Process |
81%
From NCERT
AIPMT - 2014
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A monoatomic gas at a pressure $$P$$, having a volume $$V$$, expands isothermally to a volume $$2V$$ and then adiabatically to a volume $$16V$$. The final pressure of the gas is: $$\left(\text{Take:}~ \gamma = \frac{5}{3} \right)$$

 1 $$64 ~P$$ 2 $$32~P$$ 3 $$\frac{P}{64}$$ 4 $$16~P$$
Subtopic:  Types of Processes |
74%
From NCERT
AIPMT - 2014
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The pressure of a monoatomic gas increases linearly from $4×{10}^{5}$ N/m2 to $8×{10}^{5}$ N/m2 when its volume increases from 0.2 m3 to 0.5 m3. The work done by the gas is:

1.

2.

3.

4.

Subtopic:  Work Done by a Gas |
64%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The efficiency of an ideal heat engine (Carnot heat engine) working between the freezing point and boiling point of water is:
1. $$26.8\%$$
2. $$20\%$$
3. $$6.25\%$$
4. $$12.5\%$$

Subtopic:  Carnot Engine |
77%
From NCERT
NEET - 2018
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The volume ($$V$$) of a monatomic gas varies with its temperature ($$T$$), as shown in the graph. The ratio of work done by the gas to the heat absorbed by it when it undergoes a change from state $$\mathrm{A}$$ to state $$\mathrm{B}$$ will be:

 1 $$2 \over 5$$ 2 $$2 \over 3$$ 3 $$1 \over 3$$ 4 $$2 \over 7$$
Subtopic:  Molar Specific Heat |
66%
From NCERT
NEET - 2018
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A sample of $$0.1$$ g of water at $$100^{\circ}\mathrm{C}$$ and normal pressure ($$1.013 \times10^5$$ N m–2) requires $$54$$ cal of heat energy to convert it into steam at $$100^{\circ}\mathrm{C}$$. If the volume of the steam produced is $$167.1$$ cc, then the change in internal energy of the sample will be:
1. $$104.3$$ J
2. $$208.7$$ J
3. $$42.2$$ J
4. $$84.5$$ J

Subtopic:  First Law of Thermodynamics |
69%
From NCERT
NEET - 2018
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A horizontal cylinder has two sections of unequal cross-sections in which two pistons, A and B, can move freely. The pistons are joined by a string. Some gas is trapped between the pistons. If this gas is heated, the pistons will:

 1 move to the left. 2 move to the right. 3 remain stationary. 4 move either to the left or to the right depending on the initial pressure of the gas.

Subtopic:  First Law of Thermodynamics |
52%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Next Hint
To view explanation, please take trial in the course.
NEET 2025 - Target Batch