Thermodynamics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 36 - 41 of 86

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Question number: 36

» Thermodynamics » Concept of Temperature

MCQ▾

Question

Helium at 27° has a volume of 27 litres. It is suddenly compressed to a volume of 1 litre. The temperature of the gas will be

Choices

Choice (4) Response

a.

9327°C

b.

2700°C

c.

1200°C

d.

108°C

Question number: 37

» Thermodynamics » Concept of Temperature

MCQ▾

Question

The efficiency of Carnot’s engine operating between reservoirs, maintained at temperatures 27 C and -123 C,

Choices

Choice (4) Response

a.

0.4%

b.

0.75%

c.

50%

d.

24%

Question number: 38

» Thermodynamics » Carnot Engine and Its Efficiency

MCQ▾

Question

The temperature of sink of Carnot engine is 27°C and Efficiency of engine is 50%. Then temperature of source

Choices

Choice (4) Response

a.

327°C

b.

227ºC

c.

127ºC

d.

27°C

Question number: 39

» Thermodynamics » Concept of Temperature

MCQ▾

Question

Eight moles of an ideal gas performs a cycle shown in figure. If the temperature T A = 1200 K, T B = 1600 K, T c = 4400 K and T D = 2400 K, the work done per

System of ideal gas – Trapezoid ABCD

System of Ideal Gas – Trapezoid ABCD

In above figure six moles of an ideal gas performs a cycle are shown.

Choices

Choice (4) Response

a.

120 kJ

b.

160 KJ

c.

106 kJ

d.

139 kJ

Question number: 40

» Thermodynamics » Concept of Temperature

MCQ▾

Question

A Carnot engine whose low temperature reservoir is at 7 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.

380K

b.

280 K

c.

840K

d.

560 K

Question number: 41

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

Question

A system is given 200 calories of heat and it does 600 joules of work. The internal energy of the system change in this process is (J = 4.18 Joule/cal)

Choices

Choice (4) Response

a.

- 236 Joule

b.

236.5 Joule

c.

-300 Joule

d.

236 Joule

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