ENVIRONMENTAL POLLUTION & CONTROL MCQS 20

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 20

1. Inhalation of silica dust causes a disease called
(A) Bronchitis
(B) Silicosis
(C) Pneumoconiosis
(D) None of these
Answer: Option B

2. Pick out the wrong statement.
(A) Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value
(B) Environmental pollution by NOx emission is much higher by four stroke petrol engines as compared to the two stroke engines
(C) Temperature in stratosphere rises with increasing altitude
(D) The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere
Answer: Option D

3. Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by
(A) Biological oxygen pond
(B) Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
(C) Lagoons
(D) Filtration
Answer: Option B

4. Carbon monoxide is a pollutant, which causes
(A) Respiratory disease (e.g. asthma)
(B) Asphyxiation (suffocation) leading to death
(C) Retardation in crop growth
(D) Damage to building materials like marble
Answer: Option B

5. A shallow pond in which the sewage is retained and biologically treated is called
(A) Oxidation
(B) Imhoff tank
(C) Lagoon
(D) Skimming tank
Answer: Option A
6. During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?
(A) Idle running
(B) Acceleration
(C) Cruising
(D) Deceleration
Answer: Option A

7. Pick out the wrong statement.
(A) Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust
(B) NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light
(C) Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees
(D) H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2
Answer: Option D

8. 'Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a „particulate‟?
(A) Dust & mists
(B) Smoke & fumes
(C) Photochemical smog & soot
(D) None of these
Answer: Option D

9. Main pollutants released from iron & steel industry is
(A) CO, CO2 & SO2
(B) H2S, NO & SO3
(C) CO2, H2S & NO2
(D) SO3, NO2 & CO2
Answer: Option A

10. Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
(A) Carbonates
(B) Bi-carbonates
(C) Iron & manganese
(D) Arsenic
Answer: Option C