Environmental Engineering
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is

Copper
Cast iron
Reinforced cement concrete
Steel

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Environmental Engineering
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.Reason R: The sand used in slow sand filters is finer than that in rapid sand filtersSelect your answer based on the coding system given below:

A is true but R is false
Both A and R is true but R is not the correct explanation of A
A is false but R is true
Both A and R is true and R is the correct explanation of A

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