Alpha Question Bank for Medical: Physics>Chapter 17 - Thermodynamics>Exercise-3>Q 40

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Three Carnot engines operate in series between a heat source at a temperature $T_{1}$ and a heat sink at temperature $T_{4}$ (see figure). There are two other reservoirs at temperature $T_{2}$ and $T_{3}$ as shown with $T_{1} > T_{2} > T_{3} > T_{4} .$ The three engines are equally efficient if:

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Important Questions on Thermodynamics

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Alpha Question Bank for Medical: Physics>Chapter 17 - Thermodynamics>Exercise-3>Q 41

2 kg

of a monatomic gas is at a pressure of

4 \times 10^{4} N m^{- 2}

. The density of the gas is

8 kg m^{- 3}

. What is the order of energy of the gas due to its thermal motion?

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Alpha Question Bank for Medical: Physics>Chapter 17 - Thermodynamics>Exercise-3>Q 42

Half mole of an ideal monoatomic gas is heated at a constant pressure of

1 atm

from

20 ° C

to

90 ° C

. Work done by the gas is

(

Gas constant,

R = 8.21 J {mol}^{- 1} K^{- 1}

)

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Alpha Question Bank for Medical: Physics>Chapter 17 - Thermodynamics>Exercise-3>Q 43

A rigid diatomic ideal gas undergoes an adiabatic process at room temperature. The relation between temperature and volume for this process is

T V^{x} =

constant, then

x

is:

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Alpha Question Bank for Medical: Physics>Chapter 17 - Thermodynamics>Exercise-3>Q 44

A refrigerator works between

4 ° C

and

30 ° C

. It is required to remove

600 calories

of heat every

second

in order to keep the temperature of the refrigerated space constant. The power required is [take

1 cal = 4.2 Joule

].

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Alpha Question Bank for Medical: Physics>Chapter 17 - Thermodynamics>Exercise-3>Q 45

An ideal gas undergoes a quasi-static reversible process in which its molar heat capacity

C

remains constant. If during this process, the relation of pressure

p

and volume

V

is given by

p V^{n} =

constant, then

n

is given by (here

C_{p}

and

C_{V}

are molar specific heat at constant pressure and constant volume, respectively.)