Question # 1

Woolen clothing a effective in keeping us warm because.

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An trapped int he wool acts as an insulator

Heat loss by convection and radiation is prevented

Wool is bad traciator and good absorber of heat

Wool can retain high temperatures

The highest efficiency of a heat engine whose low temperature is 17 oC and the high temperature of 200 oC is.

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20%

30%

35%

40%

Which of the following parameters does not characterize the thermodynamic state of matter.

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Temperature

Pressure

Volume

work

Law of increase of entropy is a result of

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First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Zeroth law of thermodynamics

For which process is the relation Delta Q = Delta V true.

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Isothermal

Adiabatic

isobaric

Isochoric

The transfer of thermal energy between regions of matter due to a temperature gradient is called.

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Conduction

Radiation

Convection

Sublimation

The behavior of the gases that can be easily liquefied is like that of the.

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Triatomic gases

Ideal gases

Van der walls gases

Dia atomic gases

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

During solid ficain the temperature.

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Remains constant at the freezing point

Increases at the freezing point

Decreases at the freezing point

Decreases at the melting point

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

Which thermometer is called sprint thermometer

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Alcohol thermometer

Mercury in glass thermometer

Gas thermometer

Radiation thermometer

The actual gas can behave like an ideal gas at

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Low density and high pressure

High density and high pressure

Low density and low pressure

High density and low pressure

What is a thermal properly of a material that determines the quantity of energy required to change the phase of a unit mass of that substance.

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Specific heat

Latent heat

Internal energy

Specific energy

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.

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

Change in which parameter determines the work done by a gas during adiabatic prcoess.

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volume

Pressure

Temperature

Weight

The specific heat of liquid

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Decreases with temperature

Increases with temperature

Remains constant with change in temperature

Increases with pressure

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

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1.29

1.30

1.40

1.67

Triple point of water in Kelvin scale is

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0 K

100 K

273 .15 K

373.15 K

Which of the following is a thermodynamic temperature scale.

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Celsius scale

Fahrenheit scale

Kelvin scale

Rankine scale

Specific heat a different substances varies becouse of

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Same number of molecules in unit mass

Different number of molecules in unit mass

Different K.E. of molecules in unit mass

Same K.E. of molecules in unit mass

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