A. Colloids or aerosols
B. Powder
C. Dust
D. Smoke
Related Mcqs:
- Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called__________________?
A. Grit
B. Dust
C. Powder
D. Smoke - 80% less than 200 mesh size particles are called____________________?
A. Smoke
B. Powder
C. Grit
D. Aggregates - Color test of water is done with an instrument called__________________?
A. Tintometer
B. Colorimeter
C. Electro-chemical cell
D. Turbidimeter - Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?
A. Poor visibility due to sky darkening
B. Irritation in eyes
C. Respiratory trouble
D. All A., B. and C. - Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?
A. Dust catcher (gravity type)
B. Cyclone separator
C. Bag filter
D. Hollow wet scrubber - Inhalation of silica dust causes a disease called__________________?
A. Bronchitis
B. Silicosis
C. Pneumoconiosis
D. None of these - A shallow pond in which the sewage is retained and biologically treated is called__________________?
A. Oxidation
B. Imhoff tank
C. Lagoon
D. Skimming tank - Atoms of the same element, but of different masses are called__________________?
A. Isobars
B. Isotones
C. Isotopes
D. None of these - Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?
A. Lagooning
B. Activated carbon adsorption
C. Biological oxidation pond
D. Chemical coagulation - Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
A. By chemical coagulation
B. In sedimentation tanks equipped with mechanical scrapper
C. In vacuum filter
D. In clarifiers
