Question

11. Solubility of O₂ _______________with the increase in temp.

Select one:

Increases

Decreases

No Change

12. For isokinetic sampling, static pressure at nozzle tip should be _____________than that of free stream

Select one:

Less

More

Equal

13The DO level in the water _________ from 12.30 pm to 3.30pm.

Select one:

Increasses

Decreases

Remains same

14. Which of the following particulate matter are collected in collection devices in steel industry?

Select one:

Oil

Acetic acid

Iron oxide

Boron

15. Eutrophication causes decrease in __________

Select one:

Dissolved hydrogen

Dissolved salts

Dissolved oxygen

All of the above

Answer 1

Solubility of Oxygen decreases with increase in temperature because solubility of all gases decrease as the temperature increases and the kinetic energy of the molecules increase and hence the molecules escape thus the decreased solubility.

For isokinetic sampling the static pressure at the nozzle tip should be equal to the free stream.

The DO level in the water increases from 12:30 pm to 3 :30 pm

Iron oxide is collected in collection devices in steel industry because during various process and treatment of steel the oxides of iron are formed .

Eutrophication cause decrease in dissolved oxygen level because it cut off the fresh oxygen from environment and the oxygen present already in the water body is reduced.