The increase of temperature results in_________________?

A. The sewage when running full from inside, is called internal pressure
B. The internal pressure if any, causes tensile stress in the pipe material
C. Pressure sewers are designed to be safe in tension
D. All the above

A. Bath rooms
B. Wash basins
C. Kitchen sinks
D. Toilets

A. Methane gas
B. Hydrogen sulphide
C. Carbondioxide gas
D. Diesel vapours