Which of the following statements regarding systems of plumbing for drainage of buildings is not correct?

The strength or effectiveness of a water seal is represented by its _____

The size of the rainwater pipe commonly used in house drainage is _____

Which of the following traps is commonly known as nahni trap?

Inferential meters can be used for both low and high flows.

In a house drainage system, the pipe through which human excreta flows is called ______

Which of the following is not true about lead pipes?

Septic action is produced by the septic tank by ______