Question # 1

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

if temperature eon Celsius scale is 50 oC the temperature on Fahrenheit scale will be.

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102 ^oF

108 ^oF

112 ^oF

122 ^oF

Real gases obey gas laws only at

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Low pressure and high temperature

High pressure and low temperature

High pressure and high temperature

Low pressure and low temperature

What is the heat required in Kilo joules when the temperature of 100 g of copper is raised thgough 20 K/. Specific heat capacity of copper is 0.4 x 10-3 kg -1 k-1

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0.4 kj

0.8 kj

400 kj

800 kj

The specific heat of all gases increases with temperature at high temperature decreases at low temperature expectation is

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Oxygen gas

Nitrogen gas

Mono atomic gas

Dia atomic gas

What is the human body temperature in Celsius scale.

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30 oc

36. 9 oC

98. 4 oC

100 oC

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

Absolute zero may be regarded as the temperature of which

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Water freezes

All substances are solids

All gases become liquids

Molecular motioning a gas would ceases

Which of the following is an example of an irreversible process.

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Isothermal and adiabatic process

Melting of ice

Work done against friction

Pettier effect

The gas thermometer is taken as the primary standard because.

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Thermometers are easily reproducible

Readings can be accurately taken

No correction are necessary

It produces he thermodynamic scale

When all the systems taking part in a process are included, the entropy.

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Decreases

Either remains constant of increases

Either remains constant or decreases

Remains constnat

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

What is the mean free path in a gas.

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The distance travelled by a molecule before hitting a wall

the average distance travelled by a molecule in one second

the average distance travelled by molecules in one second

The root mean square velocity

Gas law PV = constant is for

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Adiabatic change

Isothermal changes

Isobaric changes

Isochoric changes

Temperature of a gas is related to.

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Total K.E. of the gas molecules

The K.E. of the centre of mass of the gas

The P.E. of the centre of mass of the gas

Total K.E. of the molecules w.r.t the centre of mass of gas

The specific heat capacity of a substance is the amount of heat required to.

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Raise its temperature by 1 K

Raise the temperature of 1 kg of the substance by 1 K

Melt 1 kg of the substance

Boil 1 kg of the substance

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 temperature of a certain substance in Celsius scale of temperature is 800 ^oC in Kelvin scale it is.

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173 K

931 K

1073 K

1193 K

If the pressure in a closed vessel is reduced by drawing some gas the mean free path of the gas molecules.

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Decreases

Remains constant

Increases

First increases then decreases

Which one of the following temperature scales is independent of the properties of any particular substance.

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Kelvin scale

Gas scale

Thermodynamic scale

Celsius scale

The amount of heat needed per unit mass to raise the temperature of a system one degree at constant pressure is numerically aqual to

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The specific heat

The specific thermal energy

The specific heat at constant pressure

the internal energy of the gas

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