A. Are used for carrying sewage and drainage from houses
B. Are manufactured from clays and shale
C. After casting are dried and burnt at temperature 150°C, 700°C and 1200°C
D. All the above
A. 1/4
B. 1/3
C. 1/2
D. 3/4
A. mechanically formed sedimentary rock
B. igneous rock
C. chemically precipitated sedimentary rock
D. metamorphic rock
A. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
B. Proper tests for the presence of poisonous gases must be carried out
C. The men entering the manhole should be advised to smoke in the sewer
D. Warning signals should be erected
A. 1
B. 1.2
C. 0.8
D. 0.75
E. 1.25
A. surface tension
B. capillarity
C. viscosity
D. shear stress in fluids
E. buoyancy
A. A sedimentation tank and an activated sludge treatment plant
B. A plant consisting of Imhoff tanks with low rate trickling filters
C. Sedimentation tanks with high rate trickling filters
D. None of these