Environmental Chemistry Quiz - CBSE Class 11 Science

Free practice quiz: Environmental Chemistry (CBSE Class 11 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is the primary source of air pollution caused by human activities?

   1. Volcanic eruptions
   2. Forest fires
   3. Burning of fossil fuels
   4. Solar flares
   Show answer

   Answer: C. Burning of fossil fuels

   Burning fossil fuels like coal, oil, and natural gas releases pollutants like particulate matter, sulfur dioxide, and nitrogen oxides into the atmosphere.

2. Define BOD and its significance in water quality assessment.

   1. Biochemical Oxygen Demand; measures the amount of oxygen needed by aerobic microorganisms to decompose organic matter
   2. Biological Oxygen Demand; measures the amount of oxygen produced by aquatic plants
   3. Biochemical Oxygen Demand; measures the amount of carbon dioxide in water
   4. Biological Oxygen Demand; measures the amount of nitrogen in water
   Show answer

   Answer: A. Biochemical Oxygen Demand; measures the amount of oxygen needed by aerobic microorganisms to decompose organic matter

   BOD is a key indicator of water pollution. Higher BOD indicates more organic pollutants, requiring more oxygen for decomposition and potentially leading to oxygen depletion in the water body.

3. What is the role of catalytic converters in reducing automobile emissions?

   1. To increase fuel efficiency
   2. To reduce noise pollution
   3. To convert harmful gases into less harmful ones
   4. To improve engine performance
   Show answer

   Answer: C. To convert harmful gases into less harmful ones

   Catalytic converters use catalysts to convert harmful gases like carbon monoxide, nitrogen oxides, and unburnt hydrocarbons into less harmful substances like carbon dioxide, nitrogen, and water.

4. Compare and contrast the effects of different types of pesticides on the environment.

   1. All pesticides have the same environmental impact
   2. Pesticides have no negative environmental impact
   3. Different pesticides have varying levels of toxicity and persistence in the environment, impacting different organisms
   4. Pesticides only affect target pests
   Show answer

   Answer: C. Different pesticides have varying levels of toxicity and persistence in the environment, impacting different organisms

   Different pesticides have varying toxicity and persistence, affecting the environment differently. Some are highly toxic and persistent, while others are less harmful and degrade quickly.

5. Critically evaluate the effectiveness of international environmental agreements in addressing global environmental challenges.

   1. International agreements are always effective
   2. International agreements are ineffective
   3. International agreements vary in effectiveness depending on factors such as participation, enforcement mechanisms, and national policies
   4. Only national policies can address environmental challenges
   Show answer

   Answer: C. International agreements vary in effectiveness depending on factors such as participation, enforcement mechanisms, and national policies

   The success of international environmental agreements depends on various factors including participation, enforcement mechanisms, and national policies; some have been more effective than others.

More quizzes

• General Principles and Processes of Isolation of Elements
• Hydrocarbons
• Hydrogen
• Organic Chemistry - Some Basic Principles and Techniques
• P-Block Elements
• Solid State

Browse all Chemistry quizzes