Question # 1

In the gas equation PV =nRT , V is the volume of.

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1 g of gas

1 L of gas

1 mol of gas

1 kg of gas

If a gas does 10 J of external work white expanding then the change in internal energy is equal to.

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0 J

10 J

-10 J

100 J

If the number of gas molecules in a cubical vessel is increase from N to 3 N then its pressure and total energy will be.

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Half

Three times

Double

Four times

The total gain in entropy of the working substance in a Carnot cycle is.

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Positive

Negative

Infinite

Constant

The specific heat of a substance is a function of its

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mass

Weight

Volume

Molecular structure

The ratio between the energy dissipated in some process and the heat that appears as a result is the

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Specific heat

Mechanical equivalent of heat

Kilocalories

Triple point

Which statement about convection is correct.

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Brownian motion is a form of convection

Convection occurs only in gas

Convection results from a density change

Evaporation is a form of convection

By definition a gas is said to be have undergone adiabatic compressing when

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No heat exchange occurs between the gas and its surroundings

The gas is compressed quickly

The gas is compressed slowly

The temperature of the gas remains constant

The practical efficiency of a heat engine is

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25% to 30.5 %

35% to 45%

30% to 45%

15% to 25%

The gas thermometer is taken as the primary standard because.

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Thermometers are easily reproducible

Readings can be accurately taken

No correction are necessary

It produces he thermodynamic scale

Significant motion for the molecules of a monoatomic gas is.

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Rotatory

Vibratory

Translatory

Random

Which is the heat transfer mode between an object and its environment due to circular fluid motion.

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Conduction

Convection

Radiation

Mass transfer

Temperature of a gas is related to.

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Total K.E. of the gas molecules

The K.E. of the centre of mass of the gas

The P.E. of the centre of mass of the gas

Total K.E. of the molecules w.r.t the centre of mass of gas

Which temperature is the absolute measure of temperature.

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Thermodynamic temperature

Freezing point

Boiling point

Absolute zero

If T1 and T2 are source and sink temperature respectively Carnot efficiency is.

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T1+T2/T1

T1-T2/T1

T1+T2/T2

T1-T2/T2

Because of second law of thermodynamics about the direction of energy flow what is possible.

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Heat

Light

Energy

life

Which of the following pairs represent units of the same physical quantity.

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Kelvin and joule

Kelvin and calrorie

Newton and calorie

Joule and calorie

Which of the following is the ideal gas equation.

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PV -n RT

P/V = n RT

V/P = nR/T

PV = T/nR

The zero point of Kelvin scale is called.

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Critical point

Terminal point

Absolute zero

Mid point

Which of the following is a non contacting device that intercepts and measures thermal radiation.

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Thermometer

Pyrometer

Voltmeter

Lactometer

If the pressure in a closed vessel is reduced by drawing some gas the mean free path of the gas molecules.

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Decreases

Remains constant

Increases

First increases then decreases

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