Thermodynamics-Concept of Temperature (AIIMS Physics): Questions 1 - 2 of 2

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Question number: 1

» 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

Question number: 2

» Thermodynamics » Concept of Temperature

MCQ▾

Question

A large steel wheel is to be fitted on to a shaft of the same material. At 280C , the diameter of the shaft is 10.00 cm and the diameter of the hole is 9.98 cm. The shaft is cooled using ‘dry ice’. At what temperature of the shaft does the wheel slip into the shaft?

(Give α for steel =1×105K1 ).

Choices

Choice (4) Response

a.

2280C

b.

1880C

c.

2000C

d.

1280C

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