What is the ozone layer? A) A layer of carbon dioxide B) A layer rich in ozone gas (O₃) C) A layer of nitrogen gas D) A layer of hydrogen gas Answer: B) A layer rich in ozone gas (O₃)
The ozone layer is mainly found in which part of the atmosphere? A) Troposphere B) Mesosphere C) Stratosphere D) Thermosphere Answer: C) Stratosphere
What is the chemical formula of ozone? A) O₂ B) CO₂ C) O₃ D) H₂O Answer: C) O₃
The ozone layer protects Earth from: A) Infrared rays B) Ultraviolet rays C) Radio waves D) Sound waves Answer: B) Ultraviolet rays
Which type of ultraviolet radiation is mostly absorbed by the ozone layer? A) UV-A B) UV-B C) UV-C D) Both UV-B and UV-C Answer: D) Both UV-B and UV-C
Who discovered the ozone layer? A) Isaac Newton B) Charles Fabry and Henri Buisson C) Albert Einstein D) Galileo Galilei Answer: B) Charles Fabry and Henri Buisson
Ozone is formed when: A) Oxygen molecules react with sunlight B) Nitrogen reacts with oxygen C) Carbon dioxide splits D) Water vapor condenses Answer: A) Oxygen molecules react with sunlight
Which instrument is used to measure ozone concentration? A) Barometer B) Hygrometer C) Spectrophotometer D) Thermometer Answer: C) Spectrophotometer
Ozone concentration is measured in: A) Joules B) Dobson Units C) Newtons D) Watts Answer: B) Dobson Units
The largest ozone hole was first observed over: A) Asia B) Europe C) Antarctica D) Africa Answer: C) Antarctica
Ozone depletion means: A) Increase in ozone concentration B) Reduction in ozone concentration C) Formation of clouds D) Increase in rainfall Answer: B) Reduction in ozone concentration
Which chemicals are mainly responsible for ozone depletion? A) Sulfur dioxide B) Chlorofluorocarbons (CFCs) C) Oxygen D) Nitrogen Answer: B) Chlorofluorocarbons (CFCs)
CFCs were commonly used in: A) Refrigerators and aerosols B) Cars only C) Ships only D) Power plants only Answer: A) Refrigerators and aerosols
Which element released from CFCs destroys ozone? A) Sodium B) Potassium C) Chlorine D) Iron Answer: C) Chlorine
Excessive UV radiation can cause: A) Skin cancer B) Blindness C) Cataracts D) All of these Answer: D) All of these
The international agreement to protect the ozone layer is: A) Kyoto Protocol B) Paris Agreement C) Montreal Protocol D) Geneva Convention Answer: C) Montreal Protocol
The Montreal Protocol was signed in: A) 1972 B) 1987 C) 1992 D) 2000 Answer: B) 1987
Which country hosts the largest seasonal ozone hole? A) India B) Brazil C) Antarctica region D) China Answer: C) Antarctica region
Ozone in the lower atmosphere is considered: A) Beneficial B) Harmless C) A pollutant D) A fertilizer Answer: C) A pollutant
The ozone layer acts as Earth’s: A) Cooling system B) Protective shield C) Water source D) Energy source Answer: B) Protective shield
Which radiation reaches Earth in greater amounts when ozone is depleted? A) Gamma rays B) X-rays C) UV-B rays D) Radio waves Answer: C) UV-B rays
Ozone is continuously: A) Produced and destroyed naturally B) Produced only C) Destroyed only D) Frozen permanently Answer: A) Produced and destroyed naturally
Which gas is essential for the formation of ozone? A) Carbon dioxide B) Oxygen C) Methane D) Hydrogen Answer: B) Oxygen
The ozone layer is located approximately: A) 5–10 km above Earth B) 10–50 km above Earth C) 60–80 km above Earth D) 100–120 km above Earth Answer: B) 10–50 km above Earth
Which organization monitors ozone depletion globally? A) FIFA B) WHO only C) WMO and UNEP D) OPEC Answer: C) WMO and UNEP
Increased UV radiation can damage: A) Plants B) Marine life C) Human health D) All of these Answer: D) All of these
Which of the following is an ozone-friendly alternative to CFCs? A) HCFCs and HFCs B) Carbon monoxide C) Sulfur dioxide D) Nitrogen oxide Answer: A) HCFCs and HFCs
The ozone layer is sometimes called: A) Earth’s sunscreen B) Earth’s engine C) Earth’s magnet D) Earth’s core Answer: A) Earth’s sunscreen
Recovery of the ozone layer is mainly due to: A) Increased rainfall B) Reduced use of CFCs C) Increased industrialization D) Deforestation Answer: B) Reduced use of CFCs
Why is the ozone layer important? A) It produces oxygen B) It absorbs harmful UV radiation C) It causes rainfall D) It increases gravity Answer: B) It absorbs harmful UV radiation