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81.

For for measurement of temperature in cryogenic range the thermometers used are

A.	Pyrometers	B.	Radiation pyrometers
C.	Mercury thermometers	D.	Gas thermometers
E.	Electronic digital instruments

82.

Dischloromono fluoroethane is

83.

A Salinometer

A.	Measures temperatures in cryogenic regions	B.	Measure intensity of illumination
C.	Measures sound level	D.	Measures density of brine
E.	Measures solar radiation

84.

Dew points temperature is an indication of

A.	Moisture content of air	B.	Dryness of air
C.	Lowest temperature where air and water vapour start separating	D.	Condition air
E.	Any of the above

85.

During dehumidification process

A.	Specific humidity increases	B.	Specific humidity decreases
C.	Relative humidity increases	D.	Relative humidity decreases
E.	Relative humidity does not change

86.

Under increased atmospheric pressure (as compared to the standard conditions) the steam will condense at

A.	More than 100?C	B.	100?C
C.	Less than 100?C	D.	Has nothing to do with pressure
E.	Depends on other conditions

87.

Dalton's law of partial pressure state that

A.	All gases exert partial pressures only	B.	All gases or mixture of gases exent partial pressures
C.	All gases or mixture of gases in a container will exert their own pressure on the container entirely indipendent of the others	D.	Total pressure exerted by a mixture of gases or vapours is equal to the pressure exerted by individual gases or vapours
E.	None of the above

88.

Dehydration means

A.	Removing hydrogen from a mixture	B.	Removing hydrogen from a hydrocarbon
C.	Removing hydrogen from any matter	D.	Removing steam from any matter
E.	Removing water from any matter

89.

Anhydrous substance is

A.	Free of hydrogen	B.	Free of hydrogen and other chemicals containing hydrogen
C.	Free of water especially water of crystallization	D.	Free of humidity
E.	Dry substance

90.

Dehumidification means

A.	Removing humidity from a space	B.	Reducing the quantity of water vapour in a space
C.	Reducing the moisture content of a substance	D.	Any of the above
E.	None of the above