Assertion Reason Questions for Class 8 Science Chapter 18 Pollution of Air and Water
Here we are providing assertion reason questions for class 8 science. In this article, we are covering Class 8 Science Chapter 18 Pollution of Air and Water.
Directions:
The question below consists of an assertion and a Reason. Use the following key to choose the appropriate answer.
A. If both assertion and reason are correct and reason is correct explanation of the assertion.
B. If both assertion and reason are correct, but the reason is not the correct explanation of the assertion.
C. If assertion is correct, but reason is incorrect.
D. If assertion is incorrect, but reason is correct.
E. If both assertion and reason is incorrect.
Q.1. Assertion: Acid rain causes damage to monuments.
Reason: Acid rain contains acid like nitric acid and sulphuric acid.
Q.2. Assertion: Air pollution is contamination of air by unwanted substances.
Reason: Air pollution has harmful effects on both living and nonliving things.
Q.3. Assertion: Global warming is a gradual decrease in average temperature of the earth.
Reason: Green house effect is causing warming of the earth.
Q.4. Assertion: Excessive burning of fossil fuels does not cause air pollution.
Reason: Carbon monoxide, formed by incomplete combustion of fuels is a minor source of air pollution.
Q.5. Assertion: Filtration is a physical method of removing impurities.
Reason: In filtration impure water is passed through successive layers of sand, gravel and charcoal.
Q.6. Assertion: Potable water is not fit for drinking.
Reason: Potable water is harmful for aquatic life.
Q.7. Assertion: Pesticides and fertilizers cause water pollution.
Reason: Pesticides and fertilizers get dissolve in water.
Q.8. Assertion: We should consciously try to save water and not waste it.
Reason: Water is a precious resource to maintain life on earth.
Q.9. Assertion: Water pollutants are any foreign materials that pollute water.
Reason: Acids and oil spills do not cause water pollution.
Assertion Reason Questions for Class 8 Science
Assertion Reason questions are a type of question often used in science exams that ask the test taker to evaluate a given statement (the assertion) and provide a reason that supports or contradicts that statement.
In this type of question, the assertion is typically a statement about a scientific concept or phenomenon, and the reason is a statement that provides evidence or justification for the assertion. The test taker is usually asked to evaluate the assertion and reason and determine whether the reason is a valid justification for the assertion.
For example, an assertion might be “Plants produce oxygen during photosynthesis,” and the reason might be “During photosynthesis, plants use energy from the sun to convert carbon dioxide and water into glucose and oxygen.” The test taker would need to evaluate whether the reason provides a valid explanation for the assertion.
Best Approach to Answers Assertion Reason Questions for Class 8 Science
Here are some tips for approaching Assertion-Reason questions:
- Understand the meaning of the terms: Before answering an Assertion-Reason question, make sure you understand the meaning of the terms used in the statements. This will help you evaluate the truthfulness of the statements and understand the relationship between the assertion and the reason.
- Evaluate the Assertion: Read the assertion carefully and determine whether it is true or false. If you find that the assertion is false, then the reason is automatically false, and you can eliminate answer choices that claim otherwise.
- Evaluate the Reason: After evaluating the assertion, evaluate the reason. Determine whether the reason explains the assertion. If it does not, then the answer is false. If it does, then you need to check if the assertion is also true.
- Combine the answers: After evaluating the assertion and reason individually, combine the answers. If both the assertion and reason are true, and the reason explains the assertion, then the answer is true. If any of the above is false, the answer is false.
- Eliminate extreme answers: If you are not sure about the answer, try to eliminate extreme answer choices. For example, if the assertion is true, and the reason is false, eliminate answer choices that claim both are true or both are false.
- Don’t assume additional information: Do not assume additional information that is not given in the statements. Only evaluate the assertion and reason based on the information given in the question.
- Practice with past papers: The best way to prepare for Assertion-Reason questions is to practice with past papers. This will help you familiarize yourself with the type of questions and develop a strategy for answering them.
