ENVIRONMENTAL POLLUTION & CONTROL MCQS 04

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 04

1. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
(A) CO
(B) SO2
(C) NOx
 (D) CFC (chloro fluoro carbons)
Answer: Option A
2. Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
(A) 1
(B) 7
(C) 19
(D) 82
Answer: Option B
3. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
(A) 10000
(B) 5
(C) 500
(D) 1000
Answer: Option B
4. Soluble silica present in boiler feed water can be removed by
(A) Coagulation
(B) Filtration
(C) Anion exchanger
(D) Preheating it
Answer: Option C
5. Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
(A) < 1
(B) 10-100
(C) 100-200
(D) 100-1000
Answer: Option A
6. 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: Option B
7. Smog is
(A) Nothing but black smoke
(B) A combination of smoke and fog
(C) A liquid particle resulting from vapor condensation
(D) A solid particle e.g. fly-ash
Answer: Option B
8. Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
(A) Mercury
(B) Lead
(C) Fluoride
(D) Arsenic
Answer: Option C
9. Noise pollution level in a chemical plant is expressed in
(A) Roentgen
(B) Decibel
(C) Hertz
(D) None of these
Answer: Option B
10. 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: Option C