Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 3>Q 14

HARD

JEE Main

IMPORTANT

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A polytropic process for an ideal gas is represented by equation $P V^{n} = constant$ . If $γ$ is the ratio of specific heats $(\frac{C_{p}}{C_{v}})$ , then value of $n$ for which molar heat capacity of the process is negative is given as,

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Important Questions on Thermodynamics

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 3>Q 15

An ideal refrigerator has a freezer at a temperature of

- 13 ° C

. The coefficient of performance of the refrigerator is

5 .

The temperature of the air (to which heat is rejected) in

° C

will be:

MEDIUM

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Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 3>Q 16

Consider an engine that absorbs

130 cal

of heat from a hot reservoir and delivers

30 cal

heat to a cold reservoir in each cycle. The engine also consumes

2 J

energy in each cycle to overcome friction. If the engine works at

90

cycles per minute, what will be the maximum power delivered to the load? [Assume the thermal equivalent of heat is

4.2 J / cal

]

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JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 10 - Thermodynamics>Level 3>Q 17

A carnot engine working between

200 K

and

500 K

has a work output of

900 J

per cycle. The amount of heat energy supplied to the engine from the source in each cycle is