Chemical Environmental Engineering Mcqs - Set 2

1)   ______________ is the process of killing organism in water ?

a. Coagulation
b. Sterilisation
c. Disinfection
d. Sedimentation
Answer  Explanation 

ANSWER: Disinfection

Explanation:
No explanation is available for this question!


2)   Salt content in sea water is about ______________ percent?

a. 0.5
b. 1
c. 3.5
d. 9.05
Answer  Explanation 

ANSWER: 3.5

Explanation:
No explanation is available for this question!


3)   High noise levels produced during operation of fans and compressors can be reduced by using__________________?

a. Mufflers (silencers)
b. Acoustic absorbent
c. Lagging of noisy duct
d. None of these
Answer  Explanation 

ANSWER: Mufflers (silencers)

Explanation:
No explanation is available for this question!


4)   Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?

a. CO2
b. H2
c. SO3
d. N2
Answer  Explanation 

ANSWER: SO3

Explanation:
No explanation is available for this question!


5)   Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ?

a. Active carbon
b. Silica gel
c. Bog iron (iron oxide)
d. Pulverised limestone
Answer  Explanation 

ANSWER: Silica gel

Explanation:
No explanation is available for this question!


6)   The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the ________________?

a. Catalytic conversion
b. Green house effect
c. Global warming
d. Both B. and C.
Answer  Explanation 

ANSWER: Both B. and C.

Explanation:
No explanation is available for this question!


7)   Which of the following is not a practical method of low level radioactive waste disposal ?

a. Dilution with inert material
b. Discharging to atmosphere through tall stacks after dilution
c. Disposing off in rivers & oceans
d. Filling in steel crates and shooting it off out of earth’s gravity
Answer  Explanation 

ANSWER: Filling in steel crates and shooting it off out of earth’s gravity

Explanation:
No explanation is available for this question!


8)   Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?

a. Ozone and iodine
b. Chlorine or its compounds
c. Ultraviolet light for irradiation of water
d. All A., B. & C.
Answer  Explanation 

ANSWER: All A., B. & C.

Explanation:
No explanation is available for this question!


9)   Global warming may result in __________________?

a. Flood
b. Cyclone
c. Decrease in food productivity
d. All A., B. and C.
Answer  Explanation 

ANSWER: All A., B. and C.

Explanation:
No explanation is available for this question!


10)   Ringelmann chart No. 2 corresponds to _______________ percent black smoke?

a. 10
b. 20
c. 40
d. 80
Answer  Explanation 

ANSWER: 40

Explanation:
No explanation is available for this question!


11)   Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?

a. Chemical coagulation
b. Floatation & skimming
c. Centrifugation
d. Ultra filtration
Answer  Explanation 

ANSWER: Chemical coagulation

Explanation:
No explanation is available for this question!


12)   ______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?

a. Calcium
b. Fluorine
c. Phosphorous
d. Sulphur
Answer  Explanation 

ANSWER: Fluorine

Explanation:
No explanation is available for this question!


13)   The weakest sound that can be heard by a person in a quiet environment is equivalent to ____________ decibel ?

a. 1
b. 5
c. 10
d. 50
Answer  Explanation 

ANSWER: 1

Explanation:
No explanation is available for this question!


14)   Workers working in _______________ industry are most prone to white lung cancer?

a. Coal mining
b. Limestone mining
c. Textile
d. Asbestos
Answer  Explanation 

ANSWER: Textile

Explanation:
No explanation is available for this question!


15)   Which of the following is a manmade source of air pollution ?

a. Automobile exhaust
b. Forest fire
c. Bacterial action in soil and swamp areas
d. All A., B. and C.
Answer  Explanation 

ANSWER: Automobile exhaust

Explanation:
No explanation is available for this question!


16)   Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?

a. Thermosphere
b. Troposphere
c. Stratosphere
d. None of these
Answer  Explanation 

ANSWER: Troposphere

Explanation:
No explanation is available for this question!


17)   Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of________________?

a. CO2
b. SO2
c. Hydrocarbons
d. CFC (chloro fluoro carbon)
Answer  Explanation 

ANSWER: CFC (chloro fluoro carbon)

Explanation:
No explanation is available for this question!


18)   The function of skimming tank in sewage treatment is to remove _____________ substances?

a. Dissolved solid
b. Suspended solid
c. Oil & fatty
d. Gritty & inorganic
Answer  Explanation 

ANSWER: Oil & fatty

Explanation:
No explanation is available for this question!


19)   A standard test for determination of hardness in water is termed as ______________ test?

a. EDTA
b. Electometric
c. Total count
d. Presumptive
Answer  Explanation 

ANSWER: EDTA

Explanation:
No explanation is available for this question!


20)   Removal of ______________ results from the disinfection of water?

a. Turbidity
b. Odour
c. Hardness
d. Bacteria
Answer  Explanation 

ANSWER: Bacteria

Explanation:
No explanation is available for this question!