Aerosol is

 

(A) diffused liquid particles

 

(B) carbon particles of microscopic size

 

(C) dispersion of small solid or liquid particles in gaseous media

 

(D) finely divided particles of ash

All major and important gravity dams are nowadays constructed with

(A) concrete

(B) earth and rock fill

(C) brick masonry

(D) stone masonry

A circular sewer section is preferred to because

(A) it provides maximum hydraulic mea depth

(B) it provides maximum area for a given perimeter

(C) it is cheaper in construction

(D) all the above

Cowl is provided at

(A) first step in manhole

(B) upper end of the manhole

(C) lower end of ventilating column

(D) upper end of ventilating column

The flowing river water in natural drainage gets cleaned by

(A) photosynthesis

(B) self purification

(C) oxidation

(D) none of these

Temporary hardness of water may be removed by

(A) De-ionization method

(B) Zeoloite process

(C) Lime soda process

(D) Boiling

Winter rainfall in Tamil Nadu is mainly due to

(A) orographic precipitation

(B) precipitation due to turbulent ascent

(C) cyclonic precipitation

(D) convective precipitation

Depletion of ozone layer in the outer atmosphere may causes

(A) heart disorder

(B) bronchitis

(C) skin cancer

(D) lung cancer

In sewers the effect of scouring is more on

(A) horizontal side

(B) top side

(C) bottom side

(D) all sides

A commonly used handpump is

(A) axial flow pump

(B) centrifugal pump

(C) rotary pump

(D) reciprocating pump

Turbidity is measured on

(A) platinum cobalt scale

(B) standard platinum scale

(C) standard cobalt scale

(D) standard silica scale