# Thermodynamics-Concept of Temperature (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 18 - 22 of 36

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## Question number: 18

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

A Carnot engine whose low temperature reservoir is at 7 C has an efficiency of 50%. It is desired to increase the efficiency to 70%. By how many degrees should the temperature of the high temperature reservoir be increased?

### Choices

Choice (4) Response

a.

380K

b.

280 K

c.

840K

d.

560 K

## Question number: 19

» 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

## Question number: 20

» 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

## Question number: 21

» 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

## Question number: 22

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

One mole of an ideal gas at an initial temperature of TK does 8 R joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is , the final temperature of gas will be

### Choices

Choice (4) Response

a.

b.

c.

d.

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