# Thermodynamics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 74 - 78 of 86

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## Question number: 74

» Thermodynamics » Thermal Equilibrium

MCQ▾

### Question

Two Carnot engines A and B are operated in succession. The first one, A receives heat from a source at r 1 = 500 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 r 3 =300K. If the work outputs of two engines are equal, then the value of T 2 will be

### Choices

Choice (4) Response

a.

550K

b.

400K

c.

100K

d.

700 K

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## Question number: 75

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

A scientist says that the efficiency of his heat engine which operates at source temperature 107°C and sink temperature 27°C is 26%, then

### Choices

Choice (4) Response

a.

Data are incomplete

b.

It is impossible

c.

It is possible but less probable

d.

It is quite probable

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## Question number: 76

» Thermodynamics » Thermal Equilibrium

MCQ▾

### Question

For free expansion of the gas which of the following is true

### Choices

Choice (4) Response

a.

b.

c.

d.

Q = W = 0 a n d ∆ E i n t = 0

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## Question number: 77

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

### Question

In a given process for an ideal gas, ∆ W = 0 and ∆ Q < 0. Then for the gas

### Choices

Choice (4) Response

a.

The temperature will increase

b.

The pressure will remain constant

c.

The temperature will decrease

d.

The volume will increase

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## Question number: 78

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

An ideal gas is taken from point A to the point B, as shown in the P-V diagram, keeping the temperature constant. The work done in the process is

### Choices

Choice (4) Response

a.

b.

c.

d.

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