Thermodynamics (NEST (National Entrance Screening Test) Physics): Questions 4 - 5 of 5

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Question number: 4

» Thermodynamics » Carnot Engine and Its Efficiency

Appeared in Year: 2015

MCQ▾

Question

A Carnot engine is made to operate as a refrigerator. This refrigerator is used to freeze water at Equation to ice at Equation and the heat from the working substance is discharged into a large tank containing water at Equation . The latent heat of fusion of ice is Equation . The minimum amount of work required to freeze Equation of water is closed to –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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Question number: 5

» Thermodynamics » Thermal Equilibrium

Appeared in Year: 2014

MCQ▾

Question

A body of mass Equation with specific heat Equation at temperature Equation is brought into thermal equilibrium by contact with an identical body which was initially at a lower temperature Equation . Now heat is lost to the surroundings and the temperatures are in kelvin. The change in entropy of the system is –

Choices

Choice (4) Response

a.

Equation

b.

0

c.

Equation

d.

Equation

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