At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

Thermal conductivities of most of the liquids __________ with rise in temperature.

A

Increases

B

Decreases

C

Remains unchanged

D

May increase or decrease; depends on the liquid

Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

A

CO₂

B

N₂

C

O₂

D

CO

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally

A

Decreases

B

Increases

C

Remains unchanged

D

Increases exponentially

Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.

A

Copper

B

Steel

C

Aluminium

D

Brass

A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

A

The better insulation must be put inside

B

The better insulation must be put outside

C

One could place either insulation on either side

D

One should take into account the steam temperature before deciding as to which insulation is put where

A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place

A

The better insulation material should be put just next to pipe (i.e., inside)

B

The better insulating material should be put outside

C

Either of the insulating material could be put on either side

D

Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)

At higher temperature, molal heat capacities of most of the gases (at constant pressure) __________ with increase in temperature.

A

Increases

B

Decreases

C

Remains unchanged

D

Increases linearly

For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise.

A

Sodium chloride

B

Sodium carbonate monohydrate

C

Anhydrous sodium sulphate

D

Hypo

A delivery car went from Candleford to Lark Rise and back at an average speed of23 miles per hour. If the distance from Candleford to Lark Rise is 1 mile, and the trip back too half as much time as the trip there, what was the average speed of the delivery car on the way to Lark Rise?

A

13

B

34

C

12

D

23

A delivery cart went from Candle ford to Lark Rise and back at an average speed of 2/3 miles per hour. If the distance from Candle ford to Lark Rise is 1 mile, and the trip back took half as much time as the trip there, what was the average speed of the delivery cart on the way to Lark Rise?

A

1/3

B

3/4

C

1/2

D

2/3

At constant temperature, the thermal conductivities of gases __________ with rise in pressure.

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