Question # 1

Under steady state the temperature of a body

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Increase's with time

Decreases with time

Does not charge with time

None of the above

Which quantity must be the same for two bodies if they are to be in thermal equilibrium.

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Internal energy

P.E

Temperature

Mass

What is the total entropy change during an reversible cycle.

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Unity

Infinite

Zero

Cannot be detected

No entropy change is associated with

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Isothermal process

Adiabatic process

Isochoric process

Isoteric process

What is a measure of the total energy of a thermodynamics system.

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Entropy

Enthalpy

Randomness

Chaos theory

Which of the following pairs represent units of the same physical quantity.

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Kelvin and joule

Kelvin and calrorie

Newton and calorie

Joule and calorie

Which one is the primary standard for temperature measurement.

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Resistance thermometer

Mercury in glass thermometer

Constant volume gas thermometer

Pyrometer

A heat engine with 100% efficiency would have to

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Do no work

Be at a uniform temperature

Use no heat

Discharge at 0^oC

Gas law PV = constant is for

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Adiabatic change

Isothermal changes

Isobaric changes

Isochoric changes

Which kind of motion is exhibited by molecules of monoatomic gas.

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Rotatory

Vibratory

Translatory

Random

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

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

The gas temperature is increased from 27 ^oC to 127 ^oC What is the ratio of mean kinetic energies.

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3/4

4/3

9/10

10/9

The follow of heat from hot body to cold body is an example of

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Adiabatic process

Isothermal process

Reversible process

Irreversible process

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

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Pressure

Temperature

Liquids

Fluids

What happens to Carnot efficiency if the source temperature increases.

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Decreases

Increases

Remain the same

Becomes zero

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

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

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

Gas exert pressure on walls of the visual because gas molecules.

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Posses momentum

Have finite volume

Collide with each other

Obey gas laws

A metallic rod is continuously heated at its two ends, The heat following through the rod does not depend upon.

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Mass of the upon

Area of cross section of the rod

Temperature gradient between two ends

Time for which heat flow through the rod

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