Chemical Environmental Engineering Mcqs - Set 8

1)   Which of the following is an adsorbent used for the removal of SO2 from gas/air ?

a. Bog iron
b. Limestone powder or alkalised alumina
c. Silica gel
d. Active carbon
Answer  Explanation 

ANSWER: Limestone powder or alkalised alumina

Explanation:
No explanation is available for this question!


2)   ‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?

a. Industrial chimney exhaust
b. Automobiles exhaust
c. Photochemical reaction in polluted atmosphere
d. Burning of domestic fuel
Answer  Explanation 

ANSWER: Automobiles exhaust

Explanation:
No explanation is available for this question!


3)   _____________ plant emits large amount of SO2 as an air pollutant?

a. Nitric acid
b. Sulphuric acid
c. Chlor alkali
d. Iron & steel
Answer  Explanation 

ANSWER: Sulphuric acid

Explanation:
No explanation is available for this question!


4)   The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?

a. CO2
b. CH4
c. CO
d. H2
Answer  Explanation 

ANSWER: CH4

Explanation:
No explanation is available for this question!


5)   Brown spots in fabrics will be caused by washing with water containing large amount of___________________?

a. Iron
b. Zinc
c. Iodine
d. Bromine
Answer  Explanation 

ANSWER: Iron

Explanation:
No explanation is available for this question!


6)   Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gasair mixture), rendering it the property of the most explosive gas ?

a. Hydrogen
b. Acetylene
c. Carbon monoxide
d. Ammonia
Answer  Explanation 

ANSWER: Acetylene

Explanation:
No explanation is available for this question!


7)   Maximum permissible limit of mercury in human blood is ______________ micrograms/100 c.c?

a. 1
b. 7
c. 19
d. 82
Answer  Explanation 

ANSWER: 7

Explanation:
No explanation is available for this question!


8)   Soluble silica present in boiler feed water can be removed by______________________?

a. Coagulation
b. Filtration
c. Anion exchanger
d. Preheating it
Answer  Explanation 

ANSWER: Anion exchanger

Explanation:
No explanation is available for this question!


9)   Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?

a. Acts as a green house gas thereby raising earth’s temperature
b. Causes asphyxia
c. Causes increase in sea level
d. Enhances the green house effect
Answer  Explanation 

ANSWER: Causes asphyxia

Explanation:
No explanation is available for this question!


10)   Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?

a. Mercury
b. Lead
c. Fluoride
d. Arsenic
Answer  Explanation 

ANSWER: Fluoride

Explanation:
No explanation is available for this question!


11)   A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earth’s atmosphere, which absorbs it?

a. Hydrogen
b. Carbon dioxide
c. Ozone
d. None of these
Answer  Explanation 

ANSWER: Ozone

Explanation:
No explanation is available for this question!


12)   Noise level inside a jet airliner in normal flight is about ______________ decibels?

a. 80
b. 100
c. 125
d. 150
Answer  Explanation 

ANSWER: 100

Explanation:
No explanation is available for this question!


13)   Aerosols present in atmospheric air may be__________________?

a. Positively charged
b. Negatively charged
c. Neutral
d. Combination of all A., B. & C.
Answer  Explanation 

ANSWER: Combination of all A., B. & C.

Explanation:
No explanation is available for this question!


14)   Fresh domestic sewage is _______________ in color?

a. Grey
b. Dark brown
c. Red
d. Black
Answer  Explanation 

ANSWER: Grey

Explanation:
No explanation is available for this question!


15)   Polyvinyl chloride containers are not suitable for storing_________________?

a. Foodstuffs
b. Woolen clothes
c. Metallic powder
d. None of these
Answer  Explanation 

ANSWER: Foodstuffs

Explanation:
No explanation is available for this question!


16)   The resistance of water to the passage of light through it is a measure of the___________________?

a. Turbidity
b. Color
c. Hardness
d. Dissolved gases
Answer  Explanation 

ANSWER: Turbidity

Explanation:
No explanation is available for this question!


17)   Carcinogenic air pollutants cause__________________?

a. Bone decay
b. Cancer
c. Asphyxiation (suffocation)
d. Anemia
Answer  Explanation 

ANSWER: Cancer

Explanation:
No explanation is available for this question!


18)   The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?

a. Chlorine
b. Alkalis
c. Benzene hexachloride
d. Alkyl benzene sulphonate (ABS)
Answer  Explanation 

ANSWER: Chlorine

Explanation:
No explanation is available for this question!


19)   The lowest layer of atmosphere is known as the_____________________?

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

ANSWER: Troposphere

Explanation:
No explanation is available for this question!


20)   Inhalation of silica dust by human being causes ___________________?

a. Asphyxiation
b. Shortness of breath
c. Tuberculosis
d. Both B. & C.
Answer  Explanation 

ANSWER: Both B. & C.

Explanation:
No explanation is available for this question!