Question # 1

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

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 process in which a system undergoes a change of state at constant volume.

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Isobaric process

Isochoric process

Isothermal process

Adiabatic 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

What is the necessary condition for Boyle's law to hold good.

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Isothermal

Adiabatic

Isobaric

Isochoric

Which of the following is a thermodynamic potential

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Internal energy

Enthalpy

Gibb's free energy

All of these

When heat a supplied to a metallic sphere which one of the following changes will occur.

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the mass of the sphere increases

The volume of the sphere increases

The density of the sphere increases

The internal energy of the sphere increases

If the gas pressure is increased then its mean free path becomes.

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More

Zero

Infinite

Less

Which quantity is common for systems in thermal equilibrium.

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Heat

Temperature

Momentum

Specific heat

On which temperature scale a degree is 1/180 of the interval between the freezing point and the boiling point.

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Celsius scale

Fahrenheit scales

Rankine scale

Kelvin scale

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

An immersion heater rated at 150 W is fitted into a large block of ice at 0 oC. The specific latent heat of fusionism 300 J g-1. How long does it take to melt 10 g of ice.

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5 s

10 s

15 s

20 s

The product of mass and specific heat of a substance is called.

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Latent heat

Water equivalent

Atomic heat

Heat capacity

The base unit of temperature in SI is

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Fahrenheit

Celsius

Kelvin

Rnakine

The ration Cv/Cp = y for a diatomic gas like air is

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1.29

1.30

1.40

1.67

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

In general work done on or by a gas depends on.

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The initial state only

The final state only

The initial and final states

The initial state the final state and the path

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.

When a fluid in a cylinder expands through a distance 'd' against a piston of area 'A' which is exerting a constant pressure 'P' the work done is equal by.

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PAD

PA/d

Pd/A

Pd/A2

When a liquid is hated retaining its liquid sate then its molecules gain.

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K.E.

P.E

Heat energy

Chemical energy

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