Thermodynamics (AIIMS Physics): Questions 1 - 5 of 7

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Question number: 1

» Thermodynamics » Thermal Equilibrium

Appeared in Year: 2006

MCQ▾

Question

Two balloons are filled, one with pure He gas and the other by air, respectively. If the pressure and temperature of these balloons are same then the number of molecules per unit volume is –

[AIIMS, UPCPMT 06]

Choices

Choice (4) Response

a.

more in air filled balloon

b.

in the ratio of 1: 4

c.

same in both balloons

d.

more in the He filled balloon

Question number: 2

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

Appeared in Year: 2001

MCQ▾

Question

From the following which depends on the path –

Choices

Choice (4) Response

a.

Internal energy

b.

V

c.

P

d.

PΔV

Question number: 3

» Thermodynamics » Carnot Engine and Its Efficiency

Appeared in Year: 2001

MCQ▾

Question

If the system takes 100 Cal. heat, and releases 80 cal. to sink, if source temperature is 127°C find the sink temp –

Choices

Choice (4) Response

a.

107°C

b.

47°C

c.

67°C

d.

127°C

Question number: 4

» Thermodynamics » Carnot Engine and Its Efficiency

MCQ▾

Question

If the system takes 160 Cal. heat, and releases 100 cal. to sink, if source temperature is 180°C find the sink temp –

Choices

Choice (4) Response

a.

100°celsius

b.

30°celsius

c.

10°celsius

d.

120°celsius

Question number: 5

» Thermodynamics » Concept of Temperature

MCQ▾

Question

As in figure below shows plates of same size but of two different materials A and B are connected end to end in thermal contact. The open end of A is kept at 50C and open end of B is kept at 1200C . The ratio of thermal conductivity of A and B is given as KAKB=5 .

Two plates of different materials at different temperature

Two Plates of Different Materials at Different Temperature

In figure two plates of same size but of two different materials A and B are connected end to end in thermal contact. The open end of A is kept at 5C and open end of B is kept at 120 C.

The steady – state temperature of the interface is -

Choices

Choice (4) Response

a.

15.50C

b.

28.40C

c.

24.20C

d.

22.20C

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