Assertion : The man who fits or fixes water pipes in our homes etc. is called a plumber
Reason: Pipes used for carrying water were made up of lead at one time.

Lead pipes are not used for carrying drinking water because

The hot water pipes used to heat up the rooms are painted

Metal pipes used to carry water sometimes burst in the winter. This is because

Assertion: The velocity increases, when water flowing in broader pipe enter a narrow pipe. Reason: According to equation of continuity, product of area and velocity is constant.

Eight pipes are fitted to a water tank. Some of these are water pipes to fill the tank and the remaining are waste pipes used to empty the tank. Each water pipe can fill the tank in 12 hours and eat waste pipe can empty it in 36 hours. On opening all the pipes an empty tank is filled in 3 hours. The number of waste pipes is 2 b. 3 c. 4 d. 5