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

Related Mcqs:

Pick out the wrong statement ?

A. The concentric layer in atmosphere which contains about 70% of the total mass of atmosphere and characterised by a steady decrease in temperature is called stratosphere B. Stratosphere is rich in ozone and is located just above the troposphere C. Troposphere is a turbulent dusty zone containing much of water vapor and clouds D. … Pick out the wrong statement ?Read More...

The pH value of potable water should be between____________________?

A. 1 to 1.5 B. 6.5 to 8 C. 13 to 14 D. 4 to 5...

‘Pneumoconiosis’ is a disease caused by the inhalation of ______________ dust?

A. Coal B. Uranium ore C. Iron ore D. Lime...

The progressive warming up of the earth’s surface is mainly due to the___________________?

A. Automobile exhaust B. Blanketing effect of CO2 in the atmosphere C. De-forestation D. Thickening of ozone layer...

Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?

A. Carbonates B. Bi-carbonates C. Iron & manganese D. Arsenic...