A. Foodstuffs
B. Woolen clothes
C. Metallic powder
D. None of these
A. Of clotting of blood
B. Of jamming of respiratory tract
C. It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it
incapable of absorbing oxygen
D. It forms CO2 by combining with oxygen present in the blood
A. 90
B. 120
C. 150
D. 180
A. Oxides of sulphur
B. Oxides of nitrogen
C. Carbon monoxide
D. Hydrogen sulphide
A. Grit
B. Dust
C. Powder
D. Smoke
A. Respiratory ailments (e.g. bronchitis)
B. Skin diseases (e.g. dermatitis)
C. Silicosis
D. Blurred vision
A. Are large shallow artificial lakes also known as clarification lakes, maturation ponds or
oxidation ponds
B. Use micro-organisms/bacteria in presence of dissolved oxygen
C. Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended
solid < 1 mg/litre and BOD = 3.8 mg/litre
D. All A., B. & C.