The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about ____________ decibels?

Related Mcqs:

Global warming may result in __________________?

A. Flood B. Cyclone C. Decrease in food productivity D. All A., B. and C....

Iron & manganese present as pollutant in water cannot be removed by__________________?

A. Ion exchange process B. Oxidation followed by settling & filtration C. Lime soda process or manganese zeolite process D. Chlorination...

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

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

Which of the following is not a source of ozone emission in the atmosphere?

A. Refrigerators B. Xerox machines C. Dermatological photo-therapy equipments D. High voltage electrical equipments...

What are the methods of treatment & disposal of radioactive wastes ?

A. Evaporation & chemical precipitation B. Biological methods & adsorption in ion exchange materials C. Fixing into a solid mass with cement and sinking deep in the sea D. All A., B. & C....