Thermodynamics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 74 - 78 of 86

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Question number: 74

» 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 = 500 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.

550K

b.

400K

c.

100K

d.

700 K

Question number: 75

» Thermodynamics » Concept of Temperature

MCQ▾

Question

A scientist says that the efficiency of his heat engine which operates at source temperature 107°C and sink temperature 27°C is 26%, then

Choices

Choice (4) Response

a.

Data are incomplete

b.

It is impossible

c.

It is possible but less probable

d.

It is quite probable

Question number: 76

» Thermodynamics » Thermal Equilibrium

MCQ▾

Question

For free expansion of the gas which of the following is true

Choices

Choice (4) Response

a.

b.

c.

d.

Q = W = 0 a n d ∆ E i n t = 0

Question number: 77

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

Question

In a given process for an ideal gas, ∆ W = 0 and ∆ Q < 0. Then for the gas

Choices

Choice (4) Response

a.

The temperature will increase

b.

The pressure will remain constant

c.

The temperature will decrease

d.

The volume will increase

Question number: 78

» Thermodynamics » Concept of Temperature

MCQ▾

Question

An ideal gas is taken from point A to the point B, as shown in the P-V diagram, keeping the temperature constant. The work done in the process is

Graph of pressure vs volume from point A to B

Graph of Pressure vs Volume from Point a to B

In above figure we shows that expansion of ideal gas from point A to B.

Choices

Choice (4) Response

a.

b.

c.

d.

f Page