31)

Acidic drain cleaners made of ________ or ________ acid are powerful enough to clear heavy-duty hair, food, grease, soap scum, or paper-based clogs in 15 minutes or less.

SSC CGL 2022

A)

nitric, carbonic

B)

formic, citric

C)

sulphuric, hydrochloric

D)

malic, lactic

32)

What is the maximum permissible limit of turbidity in potable water as per the Bureau of Indian Standards (BIS)(IS -10500 ∶ 2012)?

SSC CGL 2022

A)

3 NTU

B)

1 NTU

C)

5 NTU

D)

7 NTU

33)

Decrease in which of the following factors leads to an increase in the rate of evaporation?

SSC CGL 2022

A)

Wind speed above the surface of the liquid

B)

Area of the free surface of the liquid concerned

C)

Ambient temperature

D)

Humidity

34)

Solids like fats, grease and oil that float on top of liquid wastewater is called _________.

SSC CGL 2022

A)

sludge

B)

peat

C)

compost

D)

urea

35)

In order to get clean drinking water disinfectant is used after filtration. Disinfectant, however, is NOT used for removing:

SSC CGL 2022

A)

minerals

B)

viruses

C)

bacteria

D)

parasites

36)

Hot water can be a pollutant if it comes from:
(a) A hot spring (b) A power plant (c) An industry

SSC CGL 2022

A)

Only (b)

B)

Only (c)

C)

Only (a)

D)

Both (b) and (c)

37)

Colloidal systems – such as gum, starch, proteins, cellulose, agar, and gelatine – when placed in water, will absorb a large volume of water and swell up. These substances are called _________.

SSC CGL 2022

A)

apoplasts

B)

combustibles

C)

imbibants

D)

porins

38)

Chemical formula of quick lime is ______.

SSC CGL 2022

A)

CaCO₃

B)

CO₂

C)

CaO

D)

Ca(OH)₂

39)

Burning of coal is an example of ______.

SSC CGL 2022

A)

combination reaction

B)

double displacement reaction

C)

decomposition reaction

D)

displacement reaction

40)

Which of the following is highest quality coal?

SSC CGL 2022

A)

Peat

B)

Bituminous

C)

Lignite

D)

Anthracite