Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 1>Q 42

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IMPORTANT

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In any reversible process, the entropy of system and surroundings will

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Important Questions on Thermodynamics

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Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 1>Q 44

A heat engine operating between

40

degrees

C

and

380

degrees

C

has an efficiency

60 %

of that of a Carnot engine operating between the same temperatures. If the engine absorbs heat at a rate of

60 k W

, at what rate does it exhaust heat (in

k W

)? (Approximate the answer to the nearest integer.)

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Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 1>Q 45

An ideal heat engine exhausting heat at

77 ° C

is to have a

30 %

efficiency. Find the temperature

(in ° C)

at which it must take heat.

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Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 1>Q 46

A Carnot engine operates between two reservoirs of temperatures

900 K

and

300 K .

The engine performs

1200 J

of work per cycle. The heat energy (in J) delivered by the engine to the low temperature reservoir, in a cycle, is

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Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 1>Q 47

A Carnot engine has the same efficiency between (i)

100 K

and

500 K

, (ii)

T K

and

900 K

. The value of

T

is

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Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 1>Q 48

The coefficient of performance of a carnot refrigerator working between

30 ° C

and

0 ° C

is

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Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 1>Q 49

The coefficient of performance of a refrigerator is

5

. If the inside temperature of freezer is

- 20 ° C

, then the temperature of the surroundings to which it rejects heat is:

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Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 1>Q 50

A carnot engine working between

27 ° C

and

127 ° C,

draws

600 J

of heat from the reservoir in one cycle. The work done by the engine

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Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 2>Q 27

Entropy of the universe tends to be