JEE Main Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 7

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Earn 100

The temperature of $3.00 mol$ of an ideal diatomic gas is increased by $40.0 ° C$ without changing the pressure of the gas. The molecules in the gas rotate but do not oscillate. If the ratio of change in internal energy of the gas to the amount of workdone by the gas is $\frac{x}{10} .$ Then the value of $x$ (round off to the nearest integer) is $_________.$

$($ Given $R = 8.31 J {mol}^{- 1} K^{- 1})$

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Questions featured in Previous Year Papers on Heat & Thermodynamics

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JEE Main Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 4

A heat engine operates between a cold reservoir at temperature

T_{2} = 400 K

and a hot reservoir at temperature

T_{1}

. It takes

300 J

of heat from the hot reservoir and delivers

240 J

of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir has to be

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JEE Main Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 6

A sample of gas with

γ = 1.5

is taken through an adiabatic process in which the volume is compressed from

1200 {cm}^{3}

to

300 {cm}^{3} .

If the initial pressure is

200 kPa .

The absolute value of the work done by the gas in the process

=________J .

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JEE Main Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 5

A reversible engine has an efficiency of

\frac{1}{4} .

If the temperature of the sink is reduced by

58 ° C,

its efficiency becomes double. Calculate the temperature of the sink:

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JEE Main Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 3

An ideal gas is expanding such that

P T^{3} =

constant. The coefficient of volume expansion of the gas is:

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JEE Main Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 2

A refrigerator consumes an average

35 W

power to operate between temperature

- 10 ° C

to

25 ° C

. If there is no loss of energy then how much average heat per second does it transfer?

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JEE Main Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 1

An electric appliance supplies

6000 J \min^{- 1}

, heat to the system. If the system delivers a power of

90 W

. How long it would take to increase the internal energy by

2.5 \times 10^{3} J

?

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JEE Main Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 13

A monoatomic ideal gas, initially at temperature

T_{1}

is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature

T_{2}

by releasing the piston suddenly. If

l_{1}

and

l_{2}

are the lengths of the gas column, before and after the expansion respectively, then the value of

\frac{T_{1}}{T_{2}}

will be:

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JEE Main Physics Express>Chapter -1 - Heat & Thermodynamics>Exercise>Q 12

For a gas

C_{P} - C_{V} = R

in a state

P

and

C_{P} - C_{V} = 1.10 R

in a state

Q, T_{P}

and

T_{Q}

are the temperatures in two different states

P

and

Q

, respectively. Then