Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO<sub>2</sub> in air is __________ ppm.

Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.

A

5

B

500

C

1000

D

2000

Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

A

0.002

B

0.2

C

1.2

D

4.8

Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.

A

[

A.

B. 10-100

B

100-200

C

100-1000

The treatment system includes a WAC, SAC, followed by a WBA and SBA. There is a degasser in this system. Calculate the amount of SBA resin required for the following data. M Alkalinity: 100 ppm as CaCO3 P Alkalinity: 100 ppm as CaCO3 Silica: 30 ppm as CaCO3 CO2: 45 ppm as CaCO3 EMA: 100 ppm as CaCO3 Capacity: 37 Kg/m3 Correction factor: 0.9 Flow rate: 35 m3/hr Operation hours: 10 hrs

A

0.5 m3

B

0.9 m3

C

1.9 m3

D

1.5 m3

Threshold limit value (TLV) of CO in air is __________ ppm.

A

5

B

50

C

2000

D

5000

'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is

A

Industrial chimney exhaust

B

Automobiles exhaust

C

Photochemical reaction in polluted atmosphere

D

Burning of domestic fuel

Following is an ecosystem of water-body, showing the concentration of DDT in each trophic levels. Water → Algae → Fish → Pelican bird 1700 ppm → 500-600 ppm → 77 ppm → 0.2 ppm Which of the following feature is incorrect if the above is to represent biomagnification?

A

Fishes don't eat algae. Instead of fish it should be bacteria and then fish

B

The concentration of DDT should increase as we go to higher trophic-levels

C

There are no incorrect features in the above representation

D

Algae should not be present. It should be bacteria instead

Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).

A

50

B

1000

C

2000

D

5000

Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).

A

50

B

1000

C

2000

D

5000

Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

A

Highly

B

Moderately

C

Extremely

D

Very extremely

Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO2 in air is __________ ppm.

Related Questions

Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.