# Thermodynamics (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 6 - 8 of 32

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## Question number: 6

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

Appeared in Year: 2011

MCQ▾

### Question

A container with rigid walls is covered with perfectly insulating material. The container is divided into two parts by a partition. One part contains a gas while the other is fully evacuated (vacuum). The partition is suddenly removed. The gas rushes to fill the entire volume and comes to equilibrium after a little time. If the gas is not ideal.

### Choices

Choice (4) Response

a.

The initial pressure of the gas equals its final pressure

b.

The initial temperature of the gas equals its final temperature

c.

The initial internal energy of the gas equals its final internal energy

d.

The initial entropy of the gas equals its final entropy

## Question number: 7

» Thermodynamics » Measurement of Temperature

Appeared in Year: 2012

MCQ▾

### Question

A cylindrical steel rod of length 0.10 m and thermal conductivity 50 Wm-1K-1 is welded end to end to copper rod of thermal conductivity 400 Wm-1K-1 and of the same area of cross section but 0.20 m long. The free end of the steel rod is maintained at 1000C and that of the copper rod at 00C. Assuming that the rods are perfectly insulated from the surrounding the temperature at the junction of the two rods is

### Choices

Choice (4) Response

a.

500 C

b.

200 C

c.

400 C

d.

300 C

## Question number: 8

» Thermodynamics » Work in Thermodynamic Process and PV Diagrams

Appeared in Year: 2011

MCQ▾

### Question

One mole of an ideal gas at initial temperature T, undergoes a quasi-static process during which the volume V is doubled. During the process the internal energy U obeys the equation, where a is a constant. The work done during this process is

### Choices

Choice (4) Response

a.

b.

c.

d.

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