Thermodynamics (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 23 - 26 of 32

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Question number: 23

» Thermodynamics » Measurement of Temperature

MCQ▾

Question

A 10 kW drilling machine is used to drill a hole in a metal block of mass 15 kg. Assuming that 30 % power is lost in the machine, calculate the rise in temperature of the block in 4 minutes. Specific heat capacity of metal = 0.4 Jg-1 K-1.

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 24

» Thermodynamics » Thermodynamic Processes

Appeared in Year: 2015

MCQ▾

Question

The state of an ideal gas was changed isobarically. The graph depicts three such isobaric lines. Which of the following is true about the pressures of the gas?

Graph of isobaric processes

Graph of Isobaric Processes

The state of an ideal gas was changed isobarically. In figure graph depicts three such isobaric lines.

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 25

» Thermodynamics » Concept of Temperature

MCQ▾

Question

A body cools down from 600 C to 500 C in 10 minutes. Its temperature comes down to 450 C in next ten minutes. The temperature of surroundings is –

Choices

Choice (4) Response

a.

150 C

b.

400 C

c.

300 C

d.

550 C

Question number: 26

» Thermodynamics » Work in Thermodynamic Process and PV Diagrams

Appeared in Year: 2013

MCQ▾

Question

The three processes in a thermodynamic cycle shown in the figure are: Process 1⟶ 2 is isothermal; Process 2⟶ 3 is isochoric (volume remains constant); Process 3 ⟶ 1 is adiabatic. The total work done by the ideal gas in this cycle is 10 J. The internal energy decreases by 20 J in the isochoric process. The work done by the gas in the adiabatic process is –20 J. The heat added to the system in the isothermal process is

PV diagram of a cycle of three processes

PV Diagram of a Cycle of Three Processes

In figure PV diagram of a cycle of three processes is shown. Process 1 to 2 is isothermal, process 2 to 3 is isochoric and process 3 to 1 is adiabatic.

Choices

Choice (4) Response

a.

0 J

b.

20 J

c.

10 J

d.

30 J

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