Thermodynamics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 42 - 45 of 86

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Question number: 42

» Thermodynamics » Thermal Equilibrium

MCQ▾

Question

In the diagrams (i) to (iv) of variation of volume with changing pressure is shown. A gas is taken along the path ABCD. The change in internal energy of the gas will be

Choices

Choice (4) Response

a.

Negative in cases (i), (ii) and (iii) but zero in case (iv)

b.

Positive in cases (i), (ii) and (iii) but zero in case (rv)

c.

Positive in all cases (i) to (iv)

d.

Zero in all cases

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Question number: 43

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

Question

The specific heat of hydrogen gas at constant pressure is and at constant volume is . If one kilogram hydrogen gas is heated from 10°C to 20°C at constant pressure, the external work done on the gas to maintain it at constant pressure is

Choices

Choice (4) Response

a.

10 4 Cal

b.

5 ⨯ 10 3 Cal

c.

10 5 Cal

d.

10 3 Cal

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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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