Question # 1

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

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1.29

1.30

1.40

1.67

The pressure of a goas is directly proportion to

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Mean velocity of the molecules

Mean square velocity of the molecules

Root mean square velocity of the molecules

Instantaneous velocity of the molecules

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

Contrivances for converting heat into work are called.

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Heat pumps

Heat engines

IC engines

Jet engine

The normal Human body temperature in Fahrenheit scale is.

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32 ^oF

40 ^oF

98.4^oF

212 ^oF

Which of the following devoices are used for measuring temperature.

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Thermocouples

Thermistors

Thermometers

All of these

The change in entropy for any reversible cycle is identically

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Infinite

Positive

Negative

Zero

Which of the following is a thermodynamic temperature scale.

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Celsius scale

Fahrenheit scale

Kelvin scale

Rankine scale

Thermodynamics deals with

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Isolated systems

The interactions among various parts of the system

The microscopic behavior of a system

The interactions between system and surrounding

What is the triple point of water.

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273 .15 K

0 K

100 K

0 oC

The heat required to sublime one mole of the substance at standard temperature and pressure is called.

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Latest heat

Specific heat

Heat of sublimation

Heat capacity

If the temperature of the source and sink are increased by same amount the efficiency of the engine.

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Increases

Decreases

Remains unchanged

May increases of decrease

If the pressure of a gas is doubled, then its thermal conductivity will

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Increases

Decreases

Remain constant

Be zero

In order of a cyclic heat engine operating between two heat reservoirs to be as efficient as a Carnot engine. It must be.

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A gas engine

Adiabatic

Reversible

A refrigerator

What is the represented by the area inside the Carnot cycle.

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Heat taken to increase the body temperature.

Energy loss due to leakage

Useful work done

Heat rejected by the system

If we place oure hand below a lighted lamp we feel warmer due to.

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Conduction

Convection

Radiation

None of these

The heat accepted and rejected by a Carnot engine operating between two heat reservoirs defines.

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The efficiency of the working substance of the engine

the ideal gas scale of temperature

The ratio of the absolute temperature of the reservoirs

The thermal capacity of the working substance

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

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

How solid hydrogen is obtained.

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By cascade process

By joule kelvin effect

By adiabatic expansion

Lowering temperature below melting point

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