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The internal energy of the air, in a room of volume $V$ , at temperature $T$ and with outside pressure $P$ increasing linearly with time, varies as

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Important Questions on Thermodynamics

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Thermodynamics>TS EAMCET 2018 (04-May Shift-1)>Q 6

An air bubble rises from the bottom of a water tank of height $5 m$ . If the initial volume of the bubble is $3 {mm}^{3}$ . What will be its volume as it reaches the surface. Assume that its temperature does not change.

[ $g = 9.8 m s^{- 2}, 1 atm = 10^{5} Pa$ , density of water $= 1 gm {cc}^{- 1}$ ]

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Thermodynamics>TS EAMCET 2021 (04-Aug Shift-2)>Q 7

A tyre pumped to a pressure of

2

atmosphere, suddenly bursts. If the temperature of air before expansion is

T

then the air temperature after the tyre busts is
(Assume the expansion is adiabatic and adiabatic constant

γ = \frac{3}{2})

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Thermodynamics>TS EAMCET - 5 August 2021 Shift 1>Q 8

An ideal gas undergoes an adiabatic process. If the pressure of the gas is reduced by

0.1 %

then the volume is changed by (Given

r = \frac{C_{p}}{C_{v}} = \frac{5}{3}

)

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Thermodynamics>TS EAMCET - 5 August 2021 Shift 2>Q 9

An ideal monoatomic gas of volume

V

is adiabatically expanded to a volume

3 V

27 ° C .

The final temperature in Kelvins is
(use

\frac{C_{P}}{C_{V}} = \frac{5}{3}

)

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Thermodynamics>TS EAMCET 2021 (04-Aug Shift-1)>Q 10

Consider a two stage Carnot engine. In the first stage heat

Q_{1}

is absorbed at temperature

T

and heat

Q_{2}

is expelled at temperature

α T

(where

α < 1

). In the second stage heat

Q_{2}

is absorbed at temperature

α T

and heat

Q_{3}

is expelled at temperature

β T (β < α) .

The efficiency of the Carnot engine will be

EASY

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Thermodynamics>TS EAMCET - 5 August 2021 Shift 1>Q 11

The carnot heat engine have an efficiency of

50 % .

The temperature of sink is maintained at

500 K .

To increase the efficiency upto

80 %,

the increment in the source temperature is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Thermodynamics>TS EAMCET 2018 (04-May Shift-1)>Q 12

The efficiency of carnot engine is

η

when its hot and cold reservoirs are maintained at temperature

T_{1}

and

T_{2}

, respectively. To increase the efficiency to

1.5 η

, the increase in temperature

(Δ T)

of the hot reservoir by keeping the cold one constant at

T_{2}

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Thermodynamics>TS EAMCET - 5 August 2021 Shift 2>Q 13

The following figure shows a Carnot engine that works between temperatures

T_{1} = 400 K

and

T_{2} = 200 K

and drives a Carnot refrigeration that works between temperatures

T_{3} = 350 K

and

T_{4} = 250 K .

The quantity

\frac{Q_{3}}{Q_{1}}

will be

The internal energy of the air, in a room of volume V, at temperature T and with outside pressure P increasing linearly with time, varies as

Important Questions on Thermodynamics

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The internal energy of the air, in a room of volume $V$ , at temperature $T$ and with outside pressure $P$ increasing linearly with time, varies as