Environmental Engineering

421.White smoke coming out of the chimney of a furnace indicates the use of

1. Low excess air
2. Very high excess air
3. Gaseous fuel in the furnace
4. Liquid fuel in the furnace

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422.Workers working in _________ industry are most prone to white lung cancer.

1. Coal mining
2. Limestone mining
3. Textile
4. Asbestos

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423.World environment day is observed every year on the 5th of

1. June
2. December
3. July
4. September

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424.World's worst radioactive pollution was caused by nuclear reactor disaster which occured in

1. Arizona (U.S.A.)
2. Chernobyl (undivided U.S.S.R.)
3. Pennsylvania (U.S.A.)
4. Moscow (U.S.S.R.)

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425. Which one is true?

1. symbiosis when neither population affects each other
2. symbiosis when the interaction is useful to both the populations
3. commensalism when none of the interacting populations affect each other
4. commensalism when the interaction is useful to both the populations

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426. Wild life is continuously decreasing. What is the main reason of this?

1. Predation
2. Cutting down of forest
3. Destruction of habitat
4. Hunting

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