# Thermodynamics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 44 - 48 of 86

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## Question number: 44

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

A scientist says that the efficiency of his heat engine which operates at source temperature 120°C and sink temperature 27°C is 26%, then

### Choices

Choice (4) Response

a.

It is possible but less probable

b.

It is quite probable

c.

It is impossible

d.

Data are incomplete

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## Question number: 45

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

Efficiency of a Carnot engine is 50 % when temperature of outlet is 400 K. In order to increase efficiency up to 70 % keeping temperature of intake the same what will be temperature of outlet

### Choices

Choice (4) Response

a.

690 K

b.

240 K

c.

460 K

d.

870 K

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## Question number: 46

» 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 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 =300K. If the work outputs of two engines are equal, then the value of T 2 will be

### Choices

Choice (4) Response

a.

100K

b.

300K

c.

700 K

d.

550K

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## Question number: 47

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

The temperature of sink of Carnot engine is 27°C and Efficiency of engine is 40%. Then temperature of source

### Choices

Choice (4) Response

a.

127°C

b.

227ºC

c.

27ºC

d.

327°C

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## Question number: 48

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

### Question

150 J of heat is added to a gaseous system, whose internal energy change is 40 J, then the amount of external work done is

### Choices

Choice (4) Response

a.

40 J

b.

70 J

c.

110 J

d.

150 J

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