Question # 1

Mean free path in a gas is the

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Distance travelled by a molecule before hitting a wall

Average distance travelled by a molecule in one second

Average distance travelled between molecules between any two successive collisions

Root mean square velocity

Which quantity provides a quantitative measure of disorder.

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Entropy

Enthalpy

Randomness

Chaos

In which temperature range water decreases in volume with increasing temperature.

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From 0 ^oC to 4 ^oC

from 0 ^oC to 10 ^oC

from 50 ^oC to 100 ^oC

from 75 ^oC to 100 ^oC

A Carnot engine can be 100% efficient of the sink is at.

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0 k

0 oF

0 oC

273 K

In an isochoric process.

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Volume changes

Pressure changes

Temperature changes

Volume remains constant

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

In Isochoric process there is no

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Work done

Internal energy change

Volume change or work done

Heat exchanged

The mechanical equivalent of heat

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Has the same dimension as heat

Has the same dimension as work

Has the same dimensions as energy

Is dimensionless

Efficiency of a Carnot engine can never be 1 or 100% unless cold reservoir is at absolute temperature.

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0 K

100 K

273 K

373 K

Net change in entropy of a system in a Carnot's cycle in

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Positive

Negative

Zero

Infinite

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 normal Human body temperature in Fahrenheit scale is.

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32 ^oF

40 ^oF

98.4^oF

212 ^oF

When the temperature of source and sink of a heat engine become equal the entropy change will be.

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Zero

Maximum

Minimum

Negative

What is the minimum number of thermodynamic parameters required to specify the state of gas system.

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1

2

3

Infinite

Triple point of water in Kelvin scale is

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0 K

100 K

273 .15 K

373.15 K

The expression PV/KT represents.

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Number of moles of the gas

Number of molecules in the gas

Total mass of the gas

Density of the gas

In which given process does the system always return to the original thermodynamic state.

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Cyclic

Adiabatic

isothermal

Isobaric

How solid hydrogen is obtained.

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By cascade process

By joule kelvin effect

By adiabatic expansion

Lowering temperature below melting point

Which of the following is a thermodynamic potential

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Internal energy

Enthalpy

Gibb's free energy

All of these

An ice making machine extracts energy at the rate of 500 W The specific latent heat of fusion of ice is 300 kj kg-1. How long does it take to freeze 2 kg of water at 0 oC.

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120 s

150 s

1200 s

1500 s

Two stem engine A and B have their sources at 900 K and 600 K and their sinks are at 450 K and 300 K respectively.

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They are equally efficient

A is less efficient than B

a is more efficient than B

Their efficiencies cannot be determined

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