# Thermodynamics (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 16 - 19 of 32

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## Question number: 16

» Thermodynamics » Carnot Engine and Its Efficiency

MCQ▾

### Question

A reversible engine converts of the heat input into work. When the temperature of the sink is reduced by 750 C, the efficiency of the engine is doubled. The temperatures in degree centigrade of the source and the sink are –

### Choices

Choice (4) Response

a.

102, 27

b.

95, 27

c.

100, 27

d.

112, 27

## Question number: 17

» Thermodynamics » Thermodynamic Processes

MCQ▾

### Question

1 g mole of an ideal gas at STP is subjected to a reversible adiabatic expansion to double its volume. Find the change in internal energy.

### Choices

Choice (4) Response

a.

1169.5 J

b.

969.5 J

c.

1069.72 J

d.

849.28 J

## Question number: 18

» Thermodynamics » Measurement of Temperature

MCQ▾

### Question

Two rods, one made of Aluminum and the other copper of the same length and across sectional area are joined together. (The thermal conductivity of copper is and aluminum is ). If the copper end is held at 1300 C and the aluminum end is held at 50 C, what is the junction temperature (assuming no other heat losses)?

### Choices

Choice (4) Response

a.

55.60 C

b.

86.60 C

c.

1000 C

d.

88.70 C

## Question number: 19

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

### Question

An ideal gas expands from to at a constant pressure of . The heat energy supplied to the gas in this process is –

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page