Thermodynamics (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 3 - 5 of 30

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Question number: 3

» Thermodynamics » Measurement of Temperature

Appeared in Year: 2011

MCQ▾

Question

Two rods, one made of copper and the other steel of the same length and cross sectional area are joined together. (The thermal conductivity of copper is 385 J s–1 m –1 K-1 and steel is 50 J s–1 m –1K–1) If the copper end is held at 1000C and the steel end is held at 00C, what is the junction temperature (assuming no other heat losses)?

Choices

Choice (4) Response

a.

880C

b.

120C

c.

500C

d.

730C

Question number: 4

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

Appeared in Year: 2010

MCQ▾

Question

A piece of hot copper at 1000C is plunged into a pond at 300C. The copper cools down to 300C, while the pond, being huge, stays at its initial temperature. Then-

Choices

Choice (4) Response

a.

Copper loses some entropy; the pond stays at the same entropy

b.

Copper loses some entropy, and the pond gains exactly the same amount of entropy

c.

Copper loses entropy and the pond gains more than this amount of entropy

d.

copper and the pond gain in entropy

Question number: 5

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

Appeared in Year: 2010

MCQ▾

Question

A van der Waal’s gas obeys the equation of state (P+n2aV2)(Vnb)=nRT . Its internal energy is given by U=CTn2aV . The equation of quasistatic adiabatic for this gas is given by-

Choices

Choice (4) Response

a.

TCnR(Vnb)=constant

b.

PC+nRnR(Vnb)=constant

c.

TCnRV=constant

d.

TC+nRnRV=constant

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