# Thermodynamics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 46 - 50 of 86

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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

## 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

## 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

## Question number: 49

» 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.

## Question number: 50

» Thermodynamics » Thermal Equilibrium

MCQ▾

### Question

A gas mixture consists of 2 moles of oxygen and 4 moles argon at temperature T neglecting all vibrational modes, the total internal energy of the system is

### Choices

Choice (4) Response

a.

15 RT

b.

9 RT

c.

11 RT

d.

4 RT

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