Question # 1

A gas thermometer is more sensitive than a mercury thermometer because the expansion of gas for 1 o/c rise in temperature is.

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Five times as much as mercury

Ten times as much as mercury

Twenty times as much as mercury

Hundred times as much as mercury

The phenomenon of Brownian motion shows that

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Molecules exist and can be seen as bright dots moving about

Molecules moves about randomly at highs speeds

Smoke particles behaves as molecules

Smoke particles can be used as models of air molecues.

A Carnot engine has the same efficiency between (i) 100 K and 500 K and ii) T and 900 K What will be T.

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90 K

100 K

180 K

200 K

A fixed mass of an ideal gas absorbs 1000 J of heat and expands under a constant pressure of 20 kPa from a volume of 25 x 10-3 m3 to a volume 50 x 10-3 The change internal energy of the gas is.

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500 J

1000 J

-1000 J

Zero

Which of the following is defined as the amount of heat required to raise the temperature of 1 g of water by 1 ^oC

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Joule

BTO

Electron volt

Calorie

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

In four stroke cycle the crank makes

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One complete revolution

Two complete revolutions

three complete revolutions

Four complete reveolutions

Internal energy of a gas decreased when

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It gains heat

Change in cycle

Change in adiatatic

Change in reversible

How many calories of heat are required to evaporate completely 1 g or ice at 0^oC

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120 calories

520 calories

720 calories

920 calories

One calorie equals to

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1.2 J

2.2 J

3.2 J

4.2 J

The change in entropy for any reversible cycle is identically

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Infinite

Positive

Negative

Zero

In Isochoric process there is no

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Work done

Internal energy change

Volume change or work done

Heat exchanged

Most cooking involves

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Adiabatic process

Isothermal process

Isobaric process

Isochoric process

What happen to entropy in an irreversible cycle.

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No gain in entropy

No change in entropy

Loss of entropy

A net gain of entropy

When a hot liquid is mixed with a cold liquid temperature of the mixture.

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First decreases and then becomes constant

First increases and then becomes constant

Continuously decreaes

Is undefined for some time and then nearly becomes constant

At absolute zero of temperature.

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The molecular energy is zero

Molecules have translational K.E

Molecules have rotational K.E.

Molecules have maximum energy

What is the SI unit for thermal conductivity.

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W m-1 K-1

W m-2 k-2

W m-3 k-1

J kg -1 k-1

A heat engine can develop efficiency equal to 100% if the temperature of the sink is

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Less than that of source

Equal to that of source

0 K

0 ^oC

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 an example of an irreversible process.

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Isothermal and adiabatic process

Melting of ice

Work done against friction

Pettier effect

The SI unit of heat capacity is.

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kg J

Kg J-1

J K-1

Kg J-1 K-1

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