1. Which of the following is used for removing particulate matter from polluted air?
Answer:
Explanation:
Electrostatic precipitators are used to remove particulate matter from exhaust gas streams.
2. Name the metals that are present in catalytic converters.
Answer:
Explanation:
Catalytic converters use a combination of platinum, palladium, and rhodium to catalyze a redox reaction that converts toxic gases and pollutants in exhaust gas to less-toxic pollutants.
3. Biochemical oxygen demand is an indicator of pollution of
Answer:
Explanation:
Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material in water.
4. In domestic sewage, indicate the percentage of impurities.
Answer:
Explanation:
Typically, domestic sewage contains about 0.1% impurities, with the rest being water.
5. The unit by which thickness of Ozone layer is measured.
Answer:
Explanation:
The thickness of the ozone layer is measured in Dobson Units (D.U.).
6. Which of the following is made polyblend for construction of roads.
Answer:
Explanation:
Mr.Ahmed Khan is credited with the invention of polyblend, a fine powder of recycled modified plastic, for road construction.
7. The process of burning solid wastes without oxygen is called.
Answer:
Explanation:
Incineration is the combustion of organic substances contained in waste materials.
8. Some aquatic animals die due to algal bloom because of lack of.
Answer:
Explanation:
Algal blooms can deplete the oxygen in the water, leading to the death of aquatic animals.
9. The natural ageing of a lake by nutrient enrichment is called.
Answer:
Explanation:
Eutrophication is the process by which a body of water becomes enriched in dissolved nutrients that stimulate the growth of aquatic plant life, usually resulting in the depletion of dissolved oxygen.
10. According to CPCB, Which size of dust particles in air pollution are harmful to human beings?
Answer:
Explanation:
According to the Central Pollution Control Board (CPCB), particulate matter of size less than or equal to 2.5 micrometers are harmful as they can penetrate deep into the respiratory system.
11. In which year Govt. of India has introduced Joint Forest Policy?
Answer:
Explanation:
The Government of India introduced the Joint Forest Management (JFM) approach in the 1980s.
12. Which of the following is responsible for depletion of the ozone layer?
Answer:
Explanation:
Chlorofluorocarbons (CFCs) are the primary culprits responsible for the depletion of the ozone layer.
13. What is the main reason for desertification?
Answer:
Explanation:
While several factors contribute to desertification, deforestation is a leading cause as it leads to the loss of tree cover, which is essential for maintaining soil moisture and preventing erosion.
14. As per NFP 1988, how much per cent forest cover for plains should be there in India?
Answer:
Explanation:
According to the National Forest Policy (NFP) of 1988, it’s recommended that the forest cover be at least 33% of the total land area for the plains.
15. What is the cause of decrease in the population of birds in an aquatic food chain?
Answer:
Explanation:
DDT, a pesticide, accumulates in birds causing eggshell thinning and reducing their reproductive success.
16. Which of the following is the Terror of Bengal?
Answer:
Explanation:
Water Hyacinth, an invasive aquatic plant, is often referred to as the “Terror of Bengal” due to its rapid spread and the ecological problems it causes.
17. Which of the following is the dominant among greenhouse gases?
Answer:
Explanation:
Carbon dioxide is the primary greenhouse gas, responsible for the majority of global warming.
18. What are the effects of UB-B radiations on human beings?
Answer:
Explanation:
UV-B radiations can cause skin aging, skin cancers, and snow-blindness.
19. Name the problems associated with Green Revolution.
Answer:
Explanation:
The Green Revolution led to increased agricultural productivity but also resulted in problems like waterlogging and soil salinity.
20. Which of the compounds are responsible for accelerated eutrophication?
Answer:
Explanation:
Nitrates and phosphates, often from agricultural runoffs, lead to accelerated eutrophication.
21. FOAM is associated with
Answer:
Explanation:
FOAM is a term related to Sewage Treatment Plants (STP) where frothing might be observed.
22. In an area where DDT had been used extensively, the population of birds declined significantly because
Answer:
Explanation:
DDT causes thinning of bird eggshells, leading to reduced hatching success.
23. Measuring Biochemical Oxygen Demand (BOD) is a method used for
Answer:
Explanation:
BOD is used to estimate the amount of organic matter in wastewater, indicating its pollution level.
24. In an area where DDT had been used extensively, the population of birds declined significantly because
Answer:
Explanation:
DDT causes thinning of bird eggshells, leading to reduced hatching success.
25. Measuring Biochemical Oxygen Demand (BOD) is a method used for
Answer:
Explanation:
BOD is used to estimate the amount of organic matter in wastewater, indicating its pollution level.
26. dB is a standard abbreviation used for the quantitative expression of
Answer:
Explanation:
dB stands for decibel, a unit used to measure the intensity of sound, and in the context of pollution, it’s often used to measure noise pollution.
27. Common indicator organism of water pollution is:
Answer:
Explanation:
Escherichia coli (E. coli) is a commonly used indicator organism for detecting fecal contamination in water sources.
28. Shell of egg in bird becomes thin (not properly formed) due to the pollution of pesticides. This is due to interference in the activity of:
Answer:
Explanation:
Pesticides like DDT interfere with the activity of Ca ATPase, which results in reduced calcium deposition in bird eggshells, making them thin.
29. Lichens can be used as:
Answer:
Explanation:
Lichens are sensitive to pollutants and their presence or absence in an area can be used as a bio-indicator for air and water quality.
30. Industrial melanism is an example of:
Answer:
Explanation:
Industrial melanism refers to the phenomenon where darker-colored organisms become more common in industrial areas due to the advantage they get from camouflaging against the soot-darkened backgrounds.
31. Carbon dioxide is called green-house gas because it is:
Answer:
Explanation:
CO2 and other greenhouse gases allow sunlight to pass through but trap heat in the Earth’s atmosphere, leading to the greenhouse effect and global warming.
32. Which of the following is a major source of methane, a greenhouse gas?
Answer:
Explanation:
Methane is produced in rice paddies due to the anaerobic decomposition of organic matter.
33. Which harmful substance is released from the refrigerators and air conditioners, causing depletion of the ozone layer?
Answer:
Explanation:
CFCs are responsible for stratospheric ozone depletion.
34. Bio-magnification refers to the:
Answer:
Explanation:
In bio-magnification, the concentration of a substance, like a pesticide, increases as one moves up the food chain.
35. Which gas is a major contributor to the acid rain?
Answer:
Explanation:
Acid rain is primarily caused by emissions of sulphur dioxide and nitrogen oxides which react with atmospheric water to form acids.
36. Eutrophication of water bodies can be prevented by restricting the amount of:
Answer:
Explanation:
Excess phosphates lead to nutrient enrichment causing eutrophication in water bodies.
37. Which of the following is not a method of solid waste management?
Answer:
Explanation:
Aerosol dispersion is not related to solid waste management.
38. Which country hosted the Earth Summit in 1992?
Answer:
Explanation:
The Earth Summit in 1992 was held in Rio de Janeiro, Brazil.
39. Which of the following is not a renewable source of energy?
Answer:
Explanation:
Nuclear power relies on uranium, which is non-renewable.
40. Deforestation leads to:
Answer:
Explanation:
Deforestation causes increased soil erosion and lowers the groundwater level.
41. Which major event led to a focus on the dangers of nuclear energy and its environmental impact in 1986?
Answer:
Explanation:
The Chernobyl nuclear disaster in 1986 highlighted the environmental and health risks associated with nuclear energy.