Unit 4: Environmental pollution - Practice Quiz

1 What is environmental pollution?

2 Which activity is a major human cause of environmental pollution?

3 Which pollutant is commonly released by motor vehicles?

4 Which measure helps control air pollution from factories?

5 Which is a common cause of water pollution?

6 What is an effective method for controlling water pollution?

7 Excessive use of which substance can pollute agricultural soil?

8 Which practice helps reduce soil pollution?

9 Long-term exposure to loud noise can directly cause which health problem?

10 Which measure can reduce traffic noise in residential areas?

11 Which is a possible effect of excessive exposure to ionizing radiation?

12 Which substance is commonly classified as an emerging pollutant?

13 What is a major environmental effect of fireworks?

14 Which gas is the main greenhouse gas released by burning fossil fuels?

15 Which is a likely effect of climate change?

16 Which group of chemicals is mainly associated with ozone layer depletion?

17 Which gases are mainly responsible for the formation of acid rain?

18 The Bhopal gas tragedy was caused by the accidental release of which toxic gas?

19 What do the three Rs of solid waste management represent?

20 Which measure is suitable for controlling industrial wastewater pollution?

21 A residential area develops breathing problems, contaminated wells, and declining soil fertility after a chemical factory begins operating nearby. Which conclusion best describes this situation?

22 A city records high concentrations of fine particulate matter near a coal-fired power plant. Which measure would most directly reduce particulate emissions from the plant's chimney?

23 During winter, a city experiences severe smog when cool air becomes trapped below a layer of warm air. Why does pollution increase under this condition?

24 Untreated sewage enters a lake, followed by an algal bloom and a large fish die-off. Which sequence best explains the fish mortality?

25 Wastewater from a food-processing unit has a high biochemical oxygen demand (BOD). Which treatment stage is most suitable for reducing its BOD before discharge?

26 A farmer repeatedly applies a persistent pesticide. Years later, residues are detected in the soil and in birds feeding near the farm. Which practice would best reduce further contamination while maintaining pest control?

27 Soil near a mining site contains toxic concentrations of lead. Which remediation method uses living plants to remove or stabilize the metal?

28 A hospital is located beside a busy highway. Which intervention would most effectively reduce the noise reaching patients without changing the hospital's location?

29 Workers handling a sealed radioactive source want to reduce their radiation dose. Which combination follows the standard principles of radiation protection?

30 Trace amounts of antibiotics are detected downstream from hospitals and livestock farms. What is the most significant long-term ecological concern?

31 A city wants to reduce the short-term pollution peak during a major festival. Which policy would address both air and noise pollution from fireworks most directly?

32 A power company replaces a coal-fired plant with solar generation while supplying the same amount of electricity. Why can this help limit global warming?

33 A coastal farming community faces more frequent saltwater intrusion into wells and fields. Which response is primarily an adaptation to climate change?

34 A refrigeration company replaces chlorofluorocarbons (CFCs) with refrigerants that do not release chlorine in the stratosphere. Which environmental problem is most directly addressed?

35 A farming region downwind of several power plants experiences increasingly acidic rainfall. Which combined response would address both the source and an immediate soil impact?

36 A factory releases methylmercury into a bay. Residents who regularly eat contaminated fish develop neurological disorders. Which process best explains the high exposure through fish consumption?

37 Following a toxic gas leak from an industrial facility near a densely populated settlement, which measure would most directly reduce casualties during a similar future incident?

38 A municipality collects food scraps, recyclable packaging, and hazardous household waste in one truck. Which change is most important for improving material recovery and treatment?

39 A town has a large amount of separately collected food and garden waste. Which management option can produce both useful energy and a nutrient-rich residue?

40 An electroplating factory produces wastewater containing chromium and other heavy metals. Which approach best supports effective pollution control and resource recovery?

41 A power station releases chemically clean cooling water into a river. Downstream, dissolved oxygen decreases and temperature-sensitive fish disappear, although no toxic chemical exceeds its regulatory limit. Which interpretation is most accurate?

42 A city in a valley experiences severe particulate pollution on clear winter mornings. Emissions remain nearly constant, winds are weak, and temperature initially increases with altitude. Which process-control combination best addresses the episode?

43 An industrial boiler emits coarse fly ash, fine particulate matter, sulfur dioxide, and nitrogen oxides. Which control train most appropriately targets these pollutants in sequence?

44 A treatment plant removes 90% of suspended solids but little dissolved organic matter from sewage. The effluent is visually clear, yet fish kills occur downstream. Which measurement would most directly reveal the remaining oxygen-depleting pollution?

45 A phosphorus-limited lake receives sewage rich in both nitrate and phosphate. Managers can fund only one immediate intervention. Which action is most likely to reduce harmful algal blooms at their source?

46 Two soils contain the same total mass of cadmium. Soil X is acidic with low organic matter, while Soil Y is neutral with high clay and organic matter. Why may crops grown in Soil X accumulate more cadmium?

47 At a workplace, two independent machines each produce and a third produces at the same location. What is the approximate combined sound level?

48 A radioactive source has an activity of and a half-life of 8 days. After 24 days, shielding that blocks 75% of the emitted radiation is installed. What activity-equivalent exposure remains outside the shielding?

49 A municipal plant detects persistent per- and polyfluoroalkyl substances in treated wastewater. Conventional activated sludge produces little removal. Which strategy is technically most defensible?

50 Air monitoring during a fireworks festival shows a sharp increase in fine particles, barium, strontium, and perchlorate residues. Which conclusion best connects these observations to likely impacts?

51 Suppose doubling atmospheric carbon dioxide produces a radiative forcing of , while aerosols contribute . If the equilibrium sensitivity parameter is , what warming is estimated from the net forcing?

52 A coastal agricultural district faces rising mean sea level, more frequent storm surges, and increasing soil salinity. Which policy package combines adaptation with mitigation?

53 Why can chlorofluorocarbons remain comparatively harmless in the lower atmosphere yet cause substantial ozone loss in the stratosphere?

54 A farming region downwind of coal-fired power plants experiences soil acidification, declining crop yield, and elevated soluble aluminum. Which response most directly addresses both the cause and the damaged soil?

55 In the Minamata pollution case, why did severe neurological disease occur in communities consuming fish even when mercury concentrations in surrounding water were not always exceptionally high?

56 A city compares two waste policies: mixed-waste incineration with energy recovery, or source separation followed by recycling, composting, and treatment of residuals. Under the waste hierarchy, when is the second policy generally preferable?

57 An industrial estate sends variable acidic, alkaline, metal-bearing, and organic waste streams into one municipal sewer. Which management change provides the strongest preventive control?

58 A metal-finishing plant wants to reduce hazardous sludge rather than merely dispose of it. Which redesign best applies cleaner-production principles?

59 A community has elevated indoor radon originating from soil gas beneath buildings. Which intervention most directly reduces long-term inhalation exposure?

60 Which lesson from the 1984 Bhopal gas disaster most directly addresses low-probability but catastrophic industrial pollution risks?