Extra 40 multiple-choice questions (MCQs) with answers from the chapter:14 "Natural Resources" for Class 9 Science (CBSE):-
Which of the following is not a natural resource?
a) Water
b) Air
c) Plastic
d) Soil
✅ Answer: (c) Plastic
Which of the following is a renewable resource?
a) Coal
b) Petroleum
c) Solar energy
d) Natural gas
✅ Answer: (c) Solar energy
What is the main component of the atmosphere?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
✅ Answer: (b) Nitrogen
Which gas is responsible for global warming?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Argon
✅ Answer: (b) Carbon dioxide
Which layer of the atmosphere protects us from harmful UV rays?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
✅ Answer: (b) Stratosphere
What is the percentage of oxygen in the atmosphere?
a) 21%
b) 78%
c) 0.03%
d) 10%
✅ Answer: (a) 21%
Which process is responsible for the formation of clouds?
a) Condensation
b) Evaporation
c) Precipitation
d) Photosynthesis
✅ Answer: (a) Condensation
Which of the following is not a fossil fuel?
a) Coal
b) Petroleum
c) Natural gas
d) Wood
✅ Answer: (d) Wood
What is the major cause of ozone layer depletion?
a) CO₂ emissions
b) CFCs (Chlorofluorocarbons)
c) Acid rain
d) Deforestation
✅ Answer: (b) CFCs (Chlorofluorocarbons)
What is the main source of energy for the Earth?
a) Wind
b) Sun
c) Water
d) Fossil fuels
✅ Answer: (b) Sun
What is the term for the circulation of water in the environment?
a) Water table
b) Hydrological cycle
c) Condensation cycle
d) Precipitation cycle
✅ Answer: (b) Hydrological cycle
Which of the following is not a greenhouse gas?
a) Methane
b) Oxygen
c) Carbon dioxide
d) Nitrous oxide
✅ Answer: (b) Oxygen
Which form of pollution is caused by excessive use of fertilizers?
a) Air pollution
b) Water pollution
c) Noise pollution
d) Thermal pollution
✅ Answer: (b) Water pollution
Which human activity causes desertification?
a) Afforestation
b) Overgrazing
c) Recycling
d) Water conservation
✅ Answer: (b) Overgrazing
What is the primary reason for acid rain?
a) Deforestation
b) Excess carbon dioxide
c) Sulphur dioxide and nitrogen oxides
d) Global warming
✅ Answer: (c) Sulphur dioxide and nitrogen oxides
Which process is responsible for soil erosion?
a) Photosynthesis
b) Deforestation
c) Conservation
d) Afforestation
✅ Answer: (b) Deforestation
Which of the following is the best method to conserve water?
a) Deforestation
b) Rainwater harvesting
c) Overuse of groundwater
d) Industrial waste dumping
✅ Answer: (b) Rainwater harvesting
What percentage of Earth's surface is covered with water?
a) 29%
b) 50%
c) 71%
d) 90%
✅ Answer: (c) 71%
What is the main source of groundwater?
a) Rivers
b) Oceans
c) Rainwater
d) Ponds
✅ Answer: (c) Rainwater
What is humus?
a) A type of rock
b) Decayed organic matter in soil
c) A type of mineral
d) A water pollutant
✅ Answer: (b) Decayed organic matter in soil
Which of the following is a non-renewable resource?
a) Forests
b) Solar energy
c) Coal
d) Wind energy
✅ Answer: (c) Coal
Which gas is most abundant in the atmosphere?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
✅ Answer: (b) Nitrogen
Which is the best way to reduce air pollution?
a) Using more fossil fuels
b) Increasing industrial production
c) Planting more trees
d) Burning more waste
✅ Answer: (c) Planting more trees
Which energy source does not cause pollution?
a) Coal
b) Natural gas
c) Solar energy
d) Petrol
✅ Answer: (c) Solar energy
Which is the main reason for biodiversity loss?
a) Conservation efforts
b) Deforestation
c) Rainwater harvesting
d) Organic farming
✅ Answer: (b) Deforestation
What is the term for excessive richness of nutrients in a water body causing dense plant growth?
a) Salinization
b) Acidification
c) Eutrophication
d) Desertification
✅ Answer: (c) Eutrophication
Which method is used to replenish groundwater?
a) Deforestation
b) Rainwater harvesting
c) Water pollution
d) Soil erosion
✅ Answer: (b) Rainwater harvesting
Which human activity is a major cause of soil erosion?
a) Afforestation
b) Overgrazing
c) Organic farming
d) Conservation tillage
✅ Answer: (b) Overgrazing
Which of the following is an example of sustainable development?
a) Overusing groundwater
b) Using renewable energy sources
c) Deforestation
d) Increasing pollution
✅ Answer: (b) Using renewable energy sources
Which is the most effective way to conserve biodiversity?
a) Habitat destruction
b) Hunting
c) Wildlife sanctuaries and national parks
d) Industrialization
✅ Answer: (c) Wildlife sanctuaries and national parks
31. Which of the following gases is essential for photosynthesis?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Methane
✅ Answer: (c) Carbon dioxide
32. Which process is responsible for releasing oxygen into the atmosphere?
a) Respiration
b) Photosynthesis
c) Combustion
d) Decomposition
✅ Answer: (b) Photosynthesis
33. Which gas is used by humans for respiration?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
✅ Answer: (b) Oxygen
34. Which of the following is an example of water pollution?
a) Planting more trees
b) Dumping industrial waste into rivers
c) Using solar energy
d) Reducing plastic use
✅ Answer: (b) Dumping industrial waste into rivers
35. What is the major cause of soil pollution?
a) Planting trees
b) Using organic manure
c) Excessive use of chemical fertilizers and pesticides
d) Crop rotation
✅ Answer: (c) Excessive use of chemical fertilizers and pesticides
36. Which of the following is a renewable source of energy?
a) Coal
b) Petroleum
c) Wind energy
d) Natural gas
✅ Answer: (c) Wind energy
37. What is the main cause of eutrophication in water bodies?
a) Oil spills
b) Excess fertilizers washing into water bodies
c) Air pollution
d) Melting of glaciers
✅ Answer: (b) Excess fertilizers washing into water bodies
38. Which of the following human activities leads to deforestation?
a) Afforestation
b) Cutting trees for agriculture and urbanization
c) Wildlife conservation
d) Soil conservation
✅ Answer: (b) Cutting trees for agriculture and urbanization
39. What is the term for the process by which harmful substances accumulate in the food chain?
a) Biomagnification
b) Photosynthesis
c) Eutrophication
d) Sedimentation
✅ Answer: (a) Biomagnification
40. Which of the following practices will help conserve natural resources?
a) Overuse of groundwater
b) Deforestation
c) Rainwater harvesting
d) Pollution of rivers
✅ Answer: (c) Rainwater harvesting
