1000+ Environmental Engineering Questions and Answers Pdf - 3

Question: 11

_____ is removed from water by lime soda process.

(A) Foul smell and taste

(B) Permanent hardness

(C) Iron and manganese

(D) Temporary hardness

Question: 12

_____ is a measure of the resistance to gas movement through a particulate control device.

(A) pressure drop

(B) particle to particle density

(C) collection efficiency

(D) none of these

Question: 13

Hydrogen ion concentration in distilled water is

(A) 10^-7

(B) 10⁷

(C) 7 × 10^-7

(D) 7 × 10⁷

Question: 14

Which of the following materials is used as landfill sealant for the control of gas and leachate movement?

(A) lime

(B) bentonite

(C) sand

(D) fly ash

Question: 15

Enzymes are organic catalyst used in the _____ reactions.

(A) electrochemical

(B) photochemical

(C) biochemical

(D) chemical