Question # 1

Thermal conduction in metals differs from thermal conduction in insulators,. The reasons for this is that , in metals heat can be transported by.

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Electrons

Lattice vibrations

Photons

Positive ions

Entropy of universe is increasing day by da due to.

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Power generating processes

Energy used into work

Depletion of ozone

All of the above

The law of equation of energy is applicable to the system whose constituents are.

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At rest

In orderly motion

in random motion

Moving at constant speed

Certain gas are called permanent gases because.

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They cannot be liquified

They are perfect gases

The critical temperatures are low

their boiling points are low

What kind of movement is dictated by the laws of thermodynamcis.

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Energy motion

Heat work

Light heat

Energy light

Difference between the molar heat capacity constant pressure and that a constant volume is equal to

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Root mean square velocity

Mean free path

Boltzmann's constant

Universal gas constant

Which of the following is heat transfer by means of the emission or absorption of electromagnetic radiation such as sunshine.

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Conduction or diffusion

Convection

Radiation

Mass transfer

The Fahrenheit and Kelvin scales intersect at

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40

-40

140

-140

Which of the following should not change in isothermal operation.

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Heat constant

Volume

Pressure

Temperature

Below which temperature gas can be liquified by increasing its pressure.

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Natural temperature

Boyle temperature

Critical temperature

Absolute zero

A mercury in glass thermometer and thermocouple thermometer are both calibrated using the same fixed point of 0 oC and 100 oc when both temperature are used to measure the temperature of a body the temperature measured on both thermometers will be exactly the same

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For all temperatures between 0 oC and 100 o C only

Only are the fixed points

For all temperatures at all times

When converted to the Kelvin scale

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%

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

Mean free path of gas molecules is inversely proportional to its

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Volume

Pressure

Temperature

Size

If the specific latent heat of vaporization of oxygen is 214 kJ kg-1 how much heat will be absorbed when 3.0 kg of oxygen is boiled off at its boiling point.

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14 kJ

64 k J

140 kJ

642 k j

The temperature which is the same in ^oC and ^oF is.

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-20

-40

20

40

What is the total entropy change during an reversible cycle.

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Unity

Infinite

Zero

Cannot be detected

Pressure of a gas depends upon

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Only on the molecular speed

Only on the speed of molecules on a unit volume

Only on the mass of molecules

Number of molecules mass and speed in a unit volume

Convention is the transfer of thermal energy by means of currents in

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Pressure

Temperature

Liquids

Fluids

Difference between Cp and Cv is equal to

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General gas constant

Planck's conatant

Molar gas constant

Boltzmann's constant

The term used for heat capacity per unit mass is.

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Latent heat

Specific heat

Energy density

Specific energy

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