Class 10 Science Chapter 13: Our Environment — MCQ Important Questions
Practice Our Environment MCQ important questions and mock-test sets for CBSE revision.
Topic-wise important and practice questions
Review question distribution across chapter topics for MCQs.
| Topic | MCQ |
|---|---|
| Biodegradable Substances | 6 |
| Food Chains and Trophic Levels | 5 |
| Non-Biodegradable Substances | 4 |
| Environmental Effects of Biodegradable Waste | 4 |
| Natural and Human-Made Ecosystems | 5 |
| CFCs and Ozone Depletion | 4 |
| Ecosystem: Biotic and Abiotic Components | 5 |
| Limits on Food-Chain Length | 4 |
| Ozone Layer and UV Protection | 4 |
| Waste Segregation and Local Waste Management | 5 |
| Biological Magnification | 3 |
| Environment-Friendly Practices | 3 |
| Food Webs and Interdependence | 5 |
| International Action on Ozone-Depleting Substances | 4 |
| Removing a Trophic Level and Ecosystem Balance | 3 |
| Producers and Photosynthetic Autotrophs | 3 |
| Trophic Position and Pollutant Concentration | 3 |
| Environmental Effects of Non-Biodegradable Waste | 3 |
| Enzyme Specificity and Biodegradability | 3 |
| Formation of Ozone in the Upper Atmosphere | 4 |
| Lifestyle, Disposable Materials and Waste Generation | 4 |
| Unidirectional Flow of Energy | 3 |
| Decomposers and Nutrient Recycling | 3 |
| Energy Capture by Producers | 2 |
| Entry of Pesticides into Food Chains | 3 |
| Consumers: Herbivores, Carnivores, Omnivores and Parasites | 3 |
| Ten Percent Law of Energy Transfer | 2 |
MCQ Preparation & Exam Strategy
Multiple Choice Questions (MCQs) for Class 10 Science Our Environment test conceptual clarity, quick elimination of distractors, and rapid application of fundamental definitions.
- Read each question stem carefully before glancing at options to avoid falling for tempting distractors.
- Use the elimination strategy: immediately rule out options that violate core scientific or mathematical rules.
- Watch out for qualifiers like "always", "never", "except", and "not true".
- Review the explanation after each question to reinforce foundational concepts for CBSE examinations.
Sample Questions
Q1. Which of the following statements best describes the primary concept in Our Environment?
- It follows the standard conservation laws outlined in the NCERT syllabus.
- It applies only under non-standard laboratory conditions.
- It contradicts foundational principles established in earlier chapters.
- It depends entirely on external pressure without physical basis.
Correct Answer: It follows the standard conservation laws outlined in the NCERT syllabus.
Explanation: Under CBSE and NCERT guidelines, fundamental principles in Our Environment strictly adhere to standard conservation and governing laws.
Q2. In the study of Our Environment, identifying key variables is critical because:
- Variables help determine the systematic outcome and relationship between quantities.
- Formulas cannot be written without arbitrary assumptions.
- Examiners only award marks for memorized tables.
- Units cancel out automatically in every scenario.
Correct Answer: Variables help determine the systematic outcome and relationship between quantities.
Explanation: Establishing independent and dependent variables is the standard scientific methodology for analyzing concepts in this chapter.
Q3. What is the standard approach to solving numerical problems related to Our Environment?
- Write given values with units, state the relevant formula, and calculate step-by-step.
- Estimate the final figure directly without intermediate calculations.
- Ignore unit conversions between standard and derived units.
- Rely solely on previous year question choices.
Correct Answer: Write given values with units, state the relevant formula, and calculate step-by-step.
Explanation: Step-by-step calculation with units ensures full credit according to CBSE marking schemes.