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This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on Environmental Issues Set 1

Q1 | What is the effect of catalytic converter on carbon monoxide and nitrogen oxide of exhaust?
  • Converts them into CO2 andH2O
  • Converts them into CO2 andNitrogen gas
  • Converts them into CO2 andNH4
  • It converts them into CO2 andNO2
Q2 | In which year noise was also included as an air pollutant?
  • 1981
  • 1987
  • 1986
  • 1984
Q3 | Sound waves of_____ decibels causes damage to eardrum or permanently impair hearing?
  • 150db or more
  • 120db or more
  • More than 80db
  • 110db
Q4 | Which type of pollution causes altered breathing pattern, increased heartbeats and sleeplessness?
  • Noise pollution
  • soil pollution
  • Radioactive pollution
  • Thermal pollution
Q5 | According to 1990s survey which city ranked 4th among the 41 most polluted cities of the world?
  • Ankleshwar
  • Delhi
  • Japan
  • China
Q6 | Name the metropolitan city leading the country in its levels of air pollution.
  • Ankleshwar
  • Delhi
  • Chennai
  • Bangalore
Q7 | Which is the drastic change seen in Delhi public transport after 2002?
  • All the buses run by CNG
  • Use of unleaded petrol
  • Use of LPG in buses
  • All the buses run by methanol
Q8 | Which is correct according to EURO II norms?
  • Sulphur can be controlled at 350ppm in diesel and 150ppm in petrol
  • Sulphur can be controlled at 150ppm in petrol
  • Lead can be controlled at 350ppm in diesel
  • Lead can be controlled at 150ppm in petrol
Q9 | Which harmless gases are produced by smokes stakes of thermal power plant and smelters?
  • N2, O2
  • CO2
  • CO, N2
  • SO2
Q10 | For reducing vehicular pollution which measures are taken by Delhi government?
  • Phasing out old vehicles
  • Use of unleaded and low sulphur petrol and diesel
  • Use of catalytic converter in vehicles
  • All of these
Q11 | In which cities Bharat stage II is applied from 1st april’2005?
  • Delhi, Mumbai, Chennai, Baroda, Surat
  • Delhi, Mumbai, Kanpur, Baroda, Surat
  • Delhi, Mumbai, Chennai, Baroda, Pune
  • Mumbai,Pune,Bangalore,Surat,Ahmedabad
Q12 | A substantial fall in the level of which gases have been found between1997 to2005 in Delhi?
  • CO2,SO2
  • CO2,CO,SO2
  • CO2,SO2 ,NO2
  • CO2,CO,CFC
Q13 | To safeguard our water resource the amendment was passed in the year.
  • 1974
  • 1981
  • 1986
  • 1987
Q14 | Which chemical of petrol inactivates the catalysts of filter for reducing emission of poisonous gases?
  • Lead
  • Rhodium
  • Straunsium
  • Iron
Q15 | Which colloidal material is seen in domestic sewage?
  • Sand and silt
  • Fecal material and bacteria
  • Sodium and calcium
  • Phosphorus
Q16 | What happens to the O2 level and BOD of river water at sewage discharge point?
  • Sharp decline in O2 level and rise in BOD
  • O2 level and BOD both increases
  • No change in BOD but O2 level increases
  • No change in O2 level but BOD increases
Q17 | What is the reason for mortality of fish in water body?
  • Biodegradation of organic matter by microbes
  • Due to algal bloom
  • Due to decrease in BOD
  • a and b both
Q18 | Which plant is known as ‘Terror of Bengal’?
  • Chara
  • Wulffia
  • Hydrilla
  • Eichhornia
Q19 | Which is world’s most problematic aquatic weed?
  • Chara
  • Wulffia
  • Hydrilla
  • Eichhornia
Q20 | Which compound used in refrigerator is a source of chlorine
  • Freon
  • HFC
  • BHC
  • None
Q21 | What is biological magnification of DDT in large size fish eating birds?
  • 25ppb
  • 25ppm
  • 2.5ppm
  • 0.25ppm
Q22 | By which method large number of particles of pollutants are separated?
  • Cyclone collector
  • Porous filter
  • Electrostatic precipitator
  • By using solvent
Q23 | Which of the following is not responsible for pollution?
  • Wood
  • SO2
  • Unsaturated carbon
  • Solar energy
Q24 | The population of eagles and hawks is declining because of,
  • Food scarcity
  • game lovers
  • Harmful effects of pesticides
  • Very few dead animals are found in fields
Q25 | BOD of a river was found to be very low, this means the water
  • Was clean
  • Was polluted
  • Contains algae
  • Contains other dissolved minerals