Q1. Select the method used for water purification.
- Water filter
- All the above
Water is generally purified using candle filter, boiling or chlorination.
Q2. Combustion of coal and petroleum products releases:
Carbon dioxide is the principal product of combustion of fossil fuels since carbon accounts for 60–90 percent of the mass of fuels that we burn.
Q3. The effect of pollution is first and most marked on
- Natural flora of a place
- Natural geochemical cycles
- Air quality
- All of these
The natural flora is the caretakers of all ecosystems. So, the effect of pollution will first hit on the plants.
Q4. Which of the following are common sources of air pollution?
- Motor vehicles
- Forest fires
Motor vehicles are significant sources of pollution that can damage the environment and pose public health issues. Carbon monoxide, nitrogen oxides, and hydrocarbons are released when fuel is burned in an internal combustion engine and when air/fuel residuals are emitted through the vehicle tailpipe.
Q5. Which of the following is not a consequence of acid rain?
- Damage to plants and trees
- Damage to buildings and statues
- Damage to soils
- Damage to respiratory system
Acid rain does not affect the respiratory system of human beings.
Q6. The main nutrients present in fertilisers are nitrogen, phosphorus, and
The main nutrients present in fertilisers are nitrogen, phosphorus, and potassium.
Q7. Algal bloom phenomenon occurs in rivers and lakes due to
- Increased chemicals
- Decreased chemicals
- Availability of clean water
- Availability of sunlight
The excessive quantities of chemicals which get washed from the fields act as nutrients for algae to flourish.
Q8. In water bodies, excessive amount of chemicals cause increased growth of
Higher concentrations of chemicals cause increased growth of algae
Q9. Which of the following is the main cause of global warming?
- Decreasing levels of CO2
- Increasing levels of CO2
- Decreasing levels of NO2
- Decreasing levels of O2
Increasing levels of CO2 is the main cause of global warming.
Q10. Which of the following is the major source of mercury entering the water bodies?
- Industrial waste
- Ignition of weapons
Mercury waste includes mercury-containing industrial wastes and also discarded mercury-containing products.
Q11. The dust storms that have large impacts on the Caribbean zone
- are the result of CFCs
- are the result of poor farming techniques
- are the result of the burning of fossil fuels
- are the result of forest fires
Poor farming techniques contribute to dust storms in the Caribbean zone.
Q12. Which of the following statement is correct?
- Use of leaded petrol should be encouraged to prevent air pollution
- Use of unleaded petrol should be encouraged to prevent air pollution
- Use of private vehicles should be encouraged to prevent air pollution
- Use of hydroelectric energy should be avoided to prevent air pollution
Use of unleaded petrol is strongly recommended to prevent hydrocarbon emissions.
Q13. Which of the following statements is incorrect?
- Discharge of domestic sewage into water bodies makes water unfit for bathing
- Discharge of treated industrial waste into water bodies makes water fit for bathing
- Discharge of pesticides into water bodies makes water rich in nutrients and fit for drinking
- Discharge of mercury into water bodies makes it unfit for drinking
Discharge of pesticides into water bodies makes water rich in nutrients and makes it unfit for drinking.
Q14. In which year, the ‘Ganga Action Plan’ was launched?
The Ganga Action Plan was launched in January 1986 aimed to reduce the pollution levels in the Ganga River.
Q15. Which of these is not an effect of global warming?
- Melting of Himalayas
- Rise in sea level
- Less violent hurricanes
The more fuels we burn, the more carbon dioxide is given out resulting in making the air around us warmer leading to global warming.
Q16. Photochemical smog is said to have an adverse impact on plant growth. It affects plant growth:
- By forming a layer on leaves
- By blocking the sunlight
- By blocking the carbon dioxide absorption
- All of these
Photochemical smog affects plant growth by forming a layer on leaves, blocking the carbon dioxide absorption and blocking the sunlight from being absorbed by leaf surface.
Q17. Which among the following is a major water pollutant leading to the death of aquatic species?
- Pesticides and fertilisers
- River water dumped into sea
- Untreated domestic sewage
Pesticides and fertilisers are the major water pollutants leading to the death of aquatic species.
Q18. The major pollutant for ozone depletion is
The main cause for the depletion of ozone is determined as the excessive release of chlorine and bromine from man-made compounds such as chlorofluorocarbons (CFCs).
Q19. Which of the following has not been a victim of eutrophication?
- Lake Erie
- Hussain Sagar Lake
- Yashwant Sagar Lake
- Surajkund lake
Lake Erie, Hussain Sagar Lake and Yashwant Sagar Lake have been a victim of Eutrophication.
Q20. Solid pollutants do not include:
- Sulphur dioxide
The solid pollutants include suspended particulate matter such as dust, smoke, asbestos, carbon and metallic particles.
Q21. Algae are small macroscopic plants that typically produce their own food through
Algae are small macroscopic plants that typically produce their own food through photosynthesis.
Q22. Which of the following is not a chemical method to purify water?
- Use of bromine
- Use of chlorine
- Use of hydrogen peroxide
Filtration consists of moving water through various screens and filters in order to remove unwanted particles and matter such as metals and nitrates.
Q23. Which of the following is not a pollutant?
H2O is the chemical formula for water. It is not a pollutant.
Q24. What does 3R stand for?
- reduce, reuse, recycle
- routine, reuse, recycle
- routine, reduce, reuse
- routine, reduce, recycle
The principle of reducing waste, reusing and recycling resources and products is often called the 3Rs- reduce, reuse and recycle.
Q25. Which of the following causes air pollution?
- Solar energy
- Wind energy
- Fossil energy
- Water energy
The burning of fossil fuels like coal and petroleum releases smoke that causes air pollution.
Q26. Which radiations are trapped inside the earth and not allowed to escape from the earth’s atmosphere?
- Ultraviolet rays
- Infrared rays
- Gamma rays
- Visible rays
Infrared rays are trapped inside the earth and not allowed to escape from the earth’s atmosphere
Q27. Which of the following adds up to the concentration of carbon dioxide in the atmosphere?
Deforestation contributes to global warming by increasing the amount of carbon dioxide in the air.
Which of the following is a less polluting form of petrol?
- Leaded petrol
- Unleaded petrol
- Sulphite petrol
As compared to leaded petrol, unleaded petrol is less polluting.
Q29. Water pollution is mainly caused due to
- Natural factors
- Man-made factors
- Cosmic factors
- All the above
Man-made factors like chemicals, sewage and fertilisers, pesticides cause water pollution.
Q30. Algal bloom affects the aquatic life by:
- Overgrowth of algae plants
- unavailability of oxygen
- Excess use of carbon dioxide
Algal bloom blocks the sunlight and uses up so much oxygen that the aquatic animals and plants die.
Q31. Van Mahotsav is celebrated in month of
Van Mahotsav is celebrated every year from the 1st to the 7th of July. It was initiated in 1950 by K.M.Munshi.
Q32. How is chlorination done to purify water?
- By adding chlorine tablets
- By adding salt
- By adding camphor
- By adding iodine
Chlorination can be done by adding chlorine tablets, bleaching powder or chlorine dioxide in water.
Q33. The most commonly used chemical method for purifying water is
- Hydrogen peroxide
Chlorination is the most commonly used chemical method for purifying water.
Q34. Eutrophication is the
- Process of nutrient enrichment of water bodies
- Process of growing of algae and is fatal to aquatic life
- Process of subsequent overgrowth of plants on surface of water
- All of these
Eutrophication is the process of nutrient enrichment of water bodies and the subsequent overgrowth of plants on the surface of the water. It is fatal to the aquatic life.
Q35. Carbon monoxide when inhaled binds to the haemoglobin in the blood and forms a compound called
- Carboxyl haemoglobin
Carboxyhemoglobin is formed when carbon monoxide inhaled binds to the haemoglobin in the blood.
Q36. Which of the following is not a major contributor to excess sediments in waterways?
- Highway construction
- Sewage effluents
Highway construction is not a major contributor to excess sediments in waterways.
Q37. How does acid rain affect the sculptural buildings?
- Reacts with marble to form calcium silicate
- Decomposes marble to form calcium sulphate
- Gives a shiny powdery coating on the marble stones
- Corrodes marble stones
Acid rain affects the sculptural buildings by reacting with the marble stones to form calcium sulphate.
Corrosion of marble due to acid rain is known as
- Acid cancer
- Marble cancer
- Lime cancer
- Calcium rust
The marble cancer refers to the corrosion of building and statues made up of marbles by the action of sulphuric acid and nitric acid.
Q39. Consider the following:
1. Oxides of Hydrogen
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above causes/cause acid rain?
- 1 and 2 only
- 3 only
- 2 and 3 only
- 1, 2 and 3
Acid rain is caused by emissions of sulphur dioxide and nitrogen oxides which react with the water molecules in the atmosphere to produce corresponding sulphuric and nitric acids which fall along with rain droplets on ground.
Q40. Which place will be a pollution free area?
- Busy road
- Industrial area
A park is a place that has many trees and green plants. The area is relatively clean as no smoke is present in a park.