Question # 1

Which of the following is produced in refrigerators by evaporation of a liquefied gas?

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Heating

Cooling

Freezing

Melting

Which gas is replaced by Ammonia in refrigerators?

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Nitrogen

Carbon di oxide

Methane

Freon gas

The temperature at which a solid start melting is:

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Freezing point

Melting point

Fusion point

Both B and C

In Fahrenheit scale, upper refrence point is:

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32 ^oF

212 ^oF

180 ^oF

100 ^oF

An instrument is used for measuring temperature is called:

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Barometer

Thermometer

Voltmeter

None of above

The value of absolute zero kelving temperature is:

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273^oC

273^oK

273^oF

-273^oC

Normal human body temperature is:

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15 ^oC

37^oC

37^oF

98,6 ^oC

Clinical thermometer is used by:

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Astronomers

Doctors

Scientist

Chemists

Which of the following material has large specific heat?

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Copper

Ice

Water

Mercury

Ice at ............ °C is more effective in cooling.

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0

-1

-2

-3

If a liquid of mass 'm' requires thermal energy 'ΔQv' to completely change into gas at its boiling point without any change in its temperature, then its latent heat of vapourization can be calculated as following:

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Hv = m/ΔQv

Hv = mΔQv

Hv = cmΔQv

Hv =ΔQv/m

The range of clinical thermometer is:

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90 ^oC - 106^oC

35^oC - 42^oC

100^oC - 132^oC

24^oC - 35^oC

Steam is used to run machine because of high amount of ___________ heat.

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Latent

Great

Large

Nil

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