Environmental Engineering in CE The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel. 5 10 20 1 5 10 20 1 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the None of these Ionosphere Troposphere Stratosphere None of these Ionosphere Troposphere Stratosphere ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm. 5 500 50 1 5 500 50 1 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Which of the following dust collection equipments is the least efficient (for sub-micronic particles)? Dust catcher (gravity type) Hollow wet scrubber Cyclone separator Bag filter Dust catcher (gravity type) Hollow wet scrubber Cyclone separator Bag filter ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm. 6000 to 9000 1000 to 2000 3000 to 6000 10000 to 100000 6000 to 9000 1000 to 2000 3000 to 6000 10000 to 100000 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE 80% less than 200 mesh size particles are called Aggregates Smoke Powder Grit Aggregates Smoke Powder Grit ANSWER DOWNLOAD EXAMIANS APP
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