# Thermodynamics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 79 - 82 of 86

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## Question number: 79

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

MCQ▾

### Question

Which of the following processes are irreversible?

(1) Transfer of heat by radiation

(2) Electrical heating of a Ni chrome wire

(3) Transfer of heat by conduction

(4) Isothermal compression

Select the correct answers and mark it according to the following is:

### Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

1 and 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

## Question number: 80

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

Assertion-Reason▾

### Assertion (Ꭺ)

In isothermal process whole heat energy supplied to the body is converted into inter energy.

### Reason (Ꭱ)

According to the first law of thermodynamics,

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

## Question number: 81

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

Six moles of an ideal gas performs a cycle shown in figure. If the temperature T A = 600K, T B = 800 K, T C = 2200K and T D = 1200. K, the work done per

### Choices

Choice (4) Response

a.

60 KJ

b.

40 kJ

c.

20 kJ

d.

30 kJ

## Question number: 82

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

A Carnot engine whose low temperature reservoir is at 17 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.

280 K

b.

560 K

c.

840K

d.

380K