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

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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

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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

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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

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