Question # 1

Which temperature is the absolute measure of temperature.

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Thermodynamic temperature

Freezing point

Boiling point

Absolute zero

Internal energy of a gas decreased when

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It gains heat

Change in cycle

Change in adiatatic

Change in reversible

A 4 kJ mass of copper of specific heat capacity of 400 J kg-1k-1 is heated for 160 s by a heater of power 200 W what is the rise in temperature.

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10 K

16 K

100 K

160 K

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

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Pressure

Temperature

Liquids

Fluids

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

If a gas does 10 J of external work white expanding then the change in internal energy is equal to.

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0 J

10 J

-10 J

100 J

When a fluid in a cylinder expands through a distance 'd' against a piston of area 'A' which is exerting a constant pressure 'P' the work done is equal by.

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PAD

PA/d

Pd/A

Pd/A2

What is the internal energy of a mono atomic ideal gas.

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Potential only

Parity kinetic and parity potential

Kinetic only

Neither kinetic nor potential

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

During an adiabatic gas expansion the environment

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Serves as a heat sink

Serves as a heat source

Must be at a higher temperature than the gas

Does not have to participate

The SI unit of heat capacity is.

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kg J

Kg J-1

J K-1

Kg J-1 K-1

When a solid is melting the temperature remains constant even through heat is being supplied because the

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Heat is being used to break up the intermolecular bonds

Solid is not absorbing any heat

Molecules are moving faster

Molecules are farther a part

If the gas pressure is increased then its mean free path becomes.

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More

Zero

Infinite

Less

In which thermodynamic process enthalpy of the system remains constant.

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Isenthalpic process

Isolated process

Isobaric process

Isochoric process

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%

In Isochoric process there is no

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Work done

Internal energy change

Volume change or work done

Heat exchanged

On what factor the internal energy of a thermodynamic system depend upon.

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History

State

Process

Surroundings

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 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

Which of the following should not change in an Isothermal process.

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Volume

Pressure

Temperature

All of these

The volume of a goas at constant pressure is directly proportional to the temperature as measured on the.

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Celsius scale

Kelvin scale

Fahrenheit scale

Baume scale

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