# Thermodynamics (NEET Physics): Questions 54 - 59 of 86

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## Question number: 54

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

### Question

110 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.

70 J

b.

40 J

c.

150 J

d.

110 J

## Question number: 55

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

The efficiency of Carnot’s engine operating between reservoirs, maintained at temperatures 27 degree Celsius and -113 degree Celsius

### Choices

Choice (4) Response

a.

0.4%

b.

50%

c.

0.75%

d.

46%

## Question number: 56

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

### Question

The first law of thermodynamics is concerned with the conservation of

### Choices

Choice (4) Response

a.

Mass

b.

Energy

c.

Temperature

d.

Momentum

## Question number: 57

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

Assertion-Reason▾

### Assertion (Ꭺ)

A room can be warmed by opening the door of a refrigerator in a closed room

### Reason (Ꭱ)

Head flows from lower temperature (refrigerator) to higher temperature (room).

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

Both Ꭺ and Ꭱ are false

## Question number: 58

» Thermodynamics » Concept of Temperature

MCQ▾

### Question

An ideal gas at 25°C is compressed adiabatically to of its original volume. If , then the rise in temperature,

### Choices

Choice (4) Response

a.

530 K

b.

225 K

c.

405 K

d.

375 K

## Question number: 59

» 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 = 700 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.

700 K

b.

500K

c.

300K

d.

550K

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