A dam constructed to store water during floods and release is gradually later is known as

 

(A) rigid dam

 

(B) detention dam

 

(C) diversion dam

 

(D) storage dam

Vertical wells provided along the banks of a riverbed to draw ground water in dry season are known as

(A) artesian wells

(B) infiltration wells

(C) tubewells

(D) open wells

Which one is not the effect of presence of iron oxide in water

(A) causes toxic effect

(B) increases hardness

(C) increases corrosiveness

(D) causes red color

Temporary hardness of water is due to the presence of

(A) nitrates

(B) sulphates

(C) carbonates

(D) chloride

The suitable method of forecasting population for a young and rapidly increasing city is

(A) graphical method

(B) incremental increase method

(C) geometrical increase method

(D) arithmetical increase method

Zero hardness of water is achieved by

(A) using excess alum dosage

(B) ion exchange method

(C) excess lime treatment

(D) using lime soda process

For trunk and out fall, the type of sewers generally used is

(A) circular shaped

(B) horse shoe shaped

(C) parabolic shaped

(D) standard egg shaped

For an area developed in haphazard way, the type of layout of water distribution system preferred as

(A) radial system

(B) ring system

(C) grid iron system

(D) dead end system

Which one of the following is not ground water?

(A) from river side radial collector wells

(B) from infiltration gallaries

(C) water from natural springs

(D) rooftop water stored in underground tank

Which one of the following is not ground water?

(A) from river side radial collector wells

(B) from infiltration gallaries

(C) water from natural springs

(D) rooftop water stored in underground tank

The layer on the top of a filtering medium formed by organic impurities is known as

(A) dirty skin

(B) tube settler

(C) permeable layer

(D) filtering layer