MCQs on International Ozone Day 16th September

When is International Ozone Day celebrated?

A) September 16

B) April 22

C) June 5

D) December 10

Answer: A) September 16

What is the purpose of celebrating International Ozone Day?

A) To promote green energy

B) To raise awareness about the depletion of the ozone layer

C) To celebrate international peace

D) To focus on ocean conservation

Answer: B) To raise awareness about the depletion of the ozone layer

Which gas forms the ozone layer in the atmosphere?

A) Oxygen (O2)

B) Ozone (O3)

C) Carbon dioxide (CO2)

D) Nitrogen (N2)

Answer: B) Ozone (O3)

In which part of the Earth’s atmosphere is the ozone layer primarily located?

A) Troposphere

B) Stratosphere

C) Mesosphere

D) Thermosphere

Answer: B) Stratosphere

Which region of the ozone layer is most depleted, leading to the formation of the “ozone hole”?

A) The Arctic

B) The Antarctic

C) The Equator

D) The Tropics

Answer: B) The Antarctic

What is the main cause of ozone layer depletion?

A) Carbon dioxide emissions

B) Chlorofluorocarbons (CFCs)

C) Methane

D) Sulfur dioxide

Answer: B) Chlorofluorocarbons (CFCs)

What is the primary function of the ozone layer?

A) To maintain Earth’s temperature

B) To absorb ultraviolet (UV) radiation

C) To reflect sunlight

D) To produce oxygen

Answer: B) To absorb ultraviolet (UV) radiation

What type of ultraviolet radiation does the ozone layer mainly absorb?

A) UV-A

B) UV-B

C) UV-C

D) UV-D

Answer: B) UV-B

Which international agreement was established to reduce the use of ozone-depleting substances?

A) Kyoto Protocol

B) Paris Agreement

C) Montreal Protocol

D) Geneva Convention

Answer: C) Montreal Protocol

In which year was the Montreal Protocol signed?

A) 1987

B) 1992

C) 2000

D) 1982

Answer: A) 1987

Which harmful effect is directly linked to increased exposure to UV radiation due to ozone depletion?

A) Skin cancer

B) Respiratory diseases

C) Heart disease

D) Diabetes

Answer: A) Skin cancer

Ozone depletion is known to cause damage to which of the following ecosystems?

A) Coral reefs

B) Deserts

C) Rainforests

D) Wetlands

Answer: A) Coral reefs

Ozone depletion primarily affects which layer of the human skin?

A) Epidermis

B) Dermis

C) Hypodermis

D) Subcutaneous tissue

Answer: A) Epidermis

Which of the following is NOT a result of ozone layer depletion?

A) Increased UV radiation

B) Higher risk of cataracts

C) Lower oxygen levels

D) Reduced agricultural productivity

Answer: C) Lower oxygen levels

Which type of plants are most vulnerable to damage from increased UV radiation?

A) Sun-loving plants

B) Aquatic plants

C) Crop plants

D) Desert plants

Answer: C) Crop plants

How does ozone depletion affect marine life, especially plankton?

A) Increased reproduction

B) Death due to higher UV exposure

C) Enhanced photosynthesis

D) No impact

Answer: B) Death due to higher UV exposure

Ozone depletion can lead to an increase in which type of human eye disease?

A) Glaucoma

B) Cataracts

C) Night blindness

D) Astigmatism

Answer: B) Cataracts

How does ozone layer depletion contribute to climate change?

A) By increasing greenhouse gases

B) By absorbing UV-B radiation

C) By altering wind patterns

D) It does not directly contribute to climate change

Answer: D) It does not directly contribute to climate change

Which species are directly affected by ozone layer depletion in polar regions?

A) Polar bears

B) Seals

C) Penguins

D) Krill and other marine organisms

Answer: D) Krill and other marine organisms

What is the main human activity that led to ozone depletion?

A) Deforestation

B) Industrial emissions

C) Use of CFCs in refrigeration and aerosols

D) Fossil fuel burning

Answer: C) Use of CFCs in refrigeration and aerosols

Which organization monitors the ozone layer globally?

A) World Health Organization (WHO)

B) United Nations Environment Programme (UNEP)

C) World Meteorological Organization (WMO)

D) International Atomic Energy Agency (IAEA)

Answer: B) United Nations Environment Programme (UNEP)

The Vienna Convention for the Protection of the Ozone Layer was adopted in which year?

A) 1985

B) 1990

C) 1995

D) 2000

Answer: A) 1985

What was the main goal of the Montreal Protocol?

A) To regulate greenhouse gas emissions

B) To phase out the production of ozone-depleting substances

C) To limit deforestation

D) To conserve biodiversity

Answer: B) To phase out the production of ozone-depleting substances

Which of the following chemicals was banned under the Montreal Protocol?

A) Carbon dioxide

B) Chlorofluorocarbons (CFCs)

C) Methane

D) Nitrous oxide

Answer: B) Chlorofluorocarbons (CFCs)

Which amendment to the Montreal Protocol aimed to phase out hydrofluorocarbons (HFCs), which are greenhouse gases?

A) Vienna Amendment

B) Kigali Amendment

C) London Amendment

D) Montreal Amendment

Answer: B) Kigali Amendment

When was the Kigali Amendment adopted?

A) 2016

B) 2010

C) 2005

D) 2020

Answer: A) 2016

Which is the primary organization that coordinates Ozone Day celebrations worldwide?

A) World Health Organization (WHO)

B) United Nations (UN)

C) Intergovernmental Panel on Climate Change (IPCC)

D) United Nations Development Programme (UNDP)

Answer: B) United Nations (UN)

Which of the following chemicals are NOT ozone-depleting substances?

A) Hydrofluorocarbons (HFCs)

B) Halons

C) Carbon tetrachloride

D) Methyl bromide

Answer: A) Hydrofluorocarbons (HFCs)

Which region has shown the largest signs of recovery from ozone depletion?

A) Antarctic

B) Arctic

C) Equatorial

D) Tropical

Answer: A) Antarctic

By which year is the ozone layer expected to recover to its 1980 levels, if current trends continue?

A) 2030

B) 2040

C) 2050

D) 2070

Answer: C) 2050

Ozone is composed of how many oxygen atoms?

A) 2

B) 3

C) 4

D) 1

Answer: B) 3

What is the chemical formula for ozone?

A) O2

B) O3

C) CO2

D) H2O

Answer: B) O3

Ozone is produced naturally in the atmosphere through the interaction of oxygen molecules with what?

A) Nitrogen

B) Carbon dioxide

C) Ultraviolet (UV) light

D) Water vapor

Answer: C) Ultraviolet (UV) light

Which wavelength of UV radiation is most harmful to living organisms but is largely absorbed by the ozone layer?

A) UV-A

B) UV-B

C) UV-C

D) Infrared

Answer: C) UV-C

Which greenhouse gas also contributes to ozone layer depletion?

A) Methane

B) Nitrous oxide

C) Carbon dioxide

D) Water vapor

Answer: B) Nitrous oxide

Which of the following is a natural source of ozone in the atmosphere?

A) Lightning

B) Volcanic eruptions

C) Animal respiration

D) Ocean waves

Answer: A) Lightning

What happens when chlorine atoms from CFCs react with ozone?

A) Ozone is broken down into oxygen molecules

B) Ozone is converted into nitrogen

C) Ozone is converted into methane

D) Ozone is stabilized

Answer: A) Ozone is broken down into oxygen molecules

Which term describes the depletion of the ozone layer over the polar regions?

A) Global warming

B) Ozone hole

C) Acid rain

D) Greenhouse effect

Answer: B) Ozone hole

How does the ozone layer protect life on Earth?

A) By reflecting solar energy

B) By absorbing ultraviolet radiation

C) By trapping heat

D) By producing oxygen

Answer: B) By absorbing ultraviolet radiation

What is a Dobson unit (DU)?

A) A measure of carbon dioxide concentration

B) A measure of the thickness of the ozone layer

C) A measure of greenhouse gas emissions

D) A measure of global warming potential

Answer: B) A measure of the thickness of the ozone layer

Which region experienced the most significant ozone depletion in the early 21st century?

A) North America

B) Europe

C) Antarctica

D) Asia

Answer: C) Antarctica

How much of the ozone layer is typically depleted during the Antarctic spring?

A) 10%

B) 30%

C) 50%

D) 70%

Answer: D) 70%

What is the primary human activity that contributes to the release of CFCs?

A) Refrigeration and air conditioning

B) Fossil fuel combustion

C) Agricultural practices

D) Logging

Answer: A) Refrigeration and air conditioning

Which of the following products were historically a major source of CFCs?

A) Spray cans

B) Cement

C) Plastic bags

D) Metal products

Answer: A) Spray cans

Which harmful radiation is mostly blocked by the ozone layer?

A) X-rays

B) Gamma rays

C) UV-B and UV-C radiation

D) Visible light

Answer: C) UV-B and UV-C radiation

Which major industry was first to transition away from CFCs following the Montreal Protocol?

A) Agriculture

B) Refrigeration and air conditioning

C) Automotive industry

D) Textile industry

Answer: B) Refrigeration and air conditioning

Which country recorded the fastest recovery of its ozone layer due to CFC phase-out?

A) United States

B) Australia

C) New Zealand

D) China

Answer: B) Australia

How does ozone depletion influence global agriculture?

A) By reducing crop yields due to UV exposure

B) By increasing rainfall

C) By enhancing photosynthesis

D) No effect

Answer: A) By reducing crop yields due to UV exposure

Which year was declared the “Year of the Ozone Layer” by the UN?

A) 1994

B) 1998

C) 2000

D) 1987

Answer: A) 1994

Which UV radiation has the greatest impact on living organisms?

A) UV-A

B) UV-B

C) UV-C

D) Infrared

Answer: B) UV-B

What is the status of the ozone layer in 2024?

A) Fully recovered

B) Still in decline

C) In slow recovery

D) Severely damaged

Answer: C) In slow recovery

Which global environmental goal is connected to the protection of the ozone layer?

A) Sustainable Development Goal 13 (Climate Action)

B) Sustainable Development Goal 14 (Life Below Water)

C) Sustainable Development Goal 7 (Affordable and Clean Energy)

D) Sustainable Development Goal 2 (Zero Hunger)

Answer: A) Sustainable Development Goal 13 (Climate Action)

Which sector is increasingly using alternatives to ozone-depleting substances?

A) Agriculture

B) Construction

C) Healthcare

D) Refrigeration and air conditioning

Answer: D) Refrigeration and air conditioning

What are Hydrofluorocarbons (HFCs) primarily used for?

A) Building construction

B) As an alternative to CFCs in cooling systems

C) Transportation fuel

D) Electricity generation

Answer: B) As an alternative to CFCs in cooling systems

Which international day was established to mark the signing of the Montreal Protocol?

A) World Environment Day

B) International Day for the Preservation of the Ozone Layer

C) Earth Day

D) World Water Day

Answer: B) International Day for the Preservation of the Ozone Layer

Which harmful substances were phased out by the Kigali Amendment?

A) HFCs

B) CFCs

C) Carbon dioxide

D) Methane

Answer: A) HFCs

Which year was the Kigali Amendment adopted?

A) 2016

B) 2012

C) 2010

D) 2005

Answer: A) 2016

Which country has been a leading example in ozone recovery by eliminating ozone-depleting substances?

A) Australia

B) China

C) United States

D) India

Answer: A) Australia

What can individuals do to help protect the ozone layer?

A) Reduce the use of air conditioning and refrigerators using CFCs

B) Use aerosol sprays with CFCs

C) Burn more fossil fuels

D) Increase greenhouse gas emissions

Answer: A) Reduce the use of air conditioning and refrigerators using CFCs

Which year is the ozone layer expected to recover fully if global regulations are followed?

A) 2035

B) 2050

C) 2060

D) 2070

Answer: B) 2050