Thermodynamics (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 16 - 19 of 30

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Question number: 16

» Thermodynamics » Carnot Engine and Its Efficiency

MCQ▾

Question

A reversible engine converts 15th 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 (γ=1.4) .

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 385Js1m1K1 and aluminum is 205Js1m1K1 ). 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 (γ=1.4) expands from 3×103m3 to 13×103m3 at a constant pressure of 2×105Pa . The heat energy supplied to the gas in this process is –

Choices

Choice (4) Response
a.

700J

b.

7000J

c.

70J

d.

7J

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