Assertion Reason Questions for Class 8 Science Chapter 13 Sound
Here we are providing assertion reason questions for class 8 science. In this article, we are covering Class 8 Science Chapter 13 Sound.
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: Vibrations are the basic cause of all sounds.
Reason: Whenever a source produces a sound there are always some vibrations linked with it.
Q.2. Assertion: Even if a loud explosion were to take place at any point on the moon, it would not be heard even at nearby points.
Reason: Unlike the earth, the moon has no atmosphere.
Q.3. Assertion: We hear thunder, a little after seeing the lightning.
Reason: Light propagates faster than sound.
Q.4. Assertion: We call sounds produced by barking of dogs, honking of horns of trucks, buses and cars as noise.
Reason: They are unpleasant sounds produced due to the regular or periodic vibrations.
Q.5. Assertion: Human being cannot detect the sounds of frequency less than 20 Hz or more than 20,000 Hz
Reason: The audible range of frequency of sound for human beings extends from about 20 Hz to about 20,000Hz.
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.