Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundries causes___________________?

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Pick out the wrong statement ?

A. Low ozone layer thickness in polar regions is due to cold climatic conditions B. Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to that emitted by a four stroke engine C. Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that … Pick out the wrong statement ?Read More...

White smoke coming out of the chimney of a furnace indicates the use of_________________?

A. Low excess air B. Very high excess air C. Gaseous fuel in the furnace D. Liquid fuel in the furnace...

Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause___________________?

A. Explosion B. Non biodegradable foam C. Undesirable plant growth D. Corrosion...

Noise level inside a jet airliner in normal flight is about ______________ decibels?

A. 80 B. 100 C. 125 D. 150...

In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?

A. 1 to 2 B. 4 to 5 C. 9 to 10 D. 15 to 20...