# Thermodynamics (NEET Physics): Questions 35 - 39 of 86

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## Question number: 35

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

### Question

The specific heat of hydrogen gas at constant pressure is and at constant volume is . If two kilogram hydrogen gas is heated from 10°C to 30°C at constant pressure, the external work done on the gas to maintain it at constant pressure is

### Choices

Choice (4) Response

a.

5 ⨯ 10 3 Cal

b.

4 × 10 3 Cal

c.

4 × 10 5 Cal

d.

4 × 10 4 Cal

## Question number: 36

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

Helium at 27° has a volume of 27 litres. It is suddenly compressed to a volume of 1 litre. The temperature of the gas will be

### Choices

Choice (4) Response

a.

9327°C

b.

2700°C

c.

1200°C

d.

108°C

## Question number: 37

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

The efficiency of Carnot’s engine operating between reservoirs, maintained at temperatures 27 C and -123 C,

### Choices

Choice (4) Response

a.

0.4%

b.

0.75%

c.

50%

d.

24%

## Question number: 38

» Thermodynamics » Carnot Engine and Its Efficiency

MCQ▾

### Question

The temperature of sink of Carnot engine is 27°C and Efficiency of engine is 50%. Then temperature of source

### Choices

Choice (4) Response

a.

327°C

b.

227ºC

c.

127ºC

d.

27°C

## Question number: 39

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

Eight moles of an ideal gas performs a cycle shown in figure. If the temperature T A = 1200 K, T B = 1600 K, T c = 4400 K and T D = 2400 K, the work done per

### Choices

Choice (4) Response

a.

120 kJ

b.

160 KJ

c.

106 kJ

d.

139 kJ

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