Last Updated on October 31, 2024 by XAM CONTENT
Hello students, we are providing assertion reason questions for class 8 science. Assertion reason questions are the new question format that is introduced in CBSE board. The resources for assertion reason questions are very less. So, to help students we have created chapterwise assertion reason questions for class 8 science. In this article, you will find assertion reason questions for cbse class 8 science chapter 11 Chemical Effects of Electric Current.
| Chapter | Chemical Effects of Electric Current |
| Type of Questions | Assertion Reason Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 8 |
| Subject | Science |
| Useful for | Class 8 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 8 Science Chapterwise Assertion Reason |
Assertion Reason Questions on Chemical Effects of Electric Current
Questions:
Q. 1. Assertion (A): One of the most reliable methods to prevent metal objects from rust is electroplating.
Reason (R): Electroplating is the process of depositing a layer of metal onto another with the help of electricity.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A)
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Difficulty Level: Easy
Ans. Option (a) is correct.
Explanation: Electroplating is widely used in industry for coating metal objects with a thin layer of a different metal. This may be done to : Make objects appear shiny, Make objects resistant to scratches, Coating of less reactive metal on more reactive metals to protect from getting spoilt.
Q. 2. Assertion (A): Distilled water do not conduct electricity.
Reason (R): Glowing of a bulb is due to heating effect of electric current.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A)
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Difficulty Level: Easy
Ans. Option (b) is correct.
Explanation: Distilled water as such do not conduct electricity, if salt is dissolved in it, it becomes a good electric conductor.
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Topics from which assertion reason questions may be asked
- Understand the conduction of electricity in liquids.
- Learn about the chemical effects of electric current.
- Know about the process of electrolysis.
- Learn electroplating and its uses.
Some liquids are good conductors of electricity and some are poor conductors. Most liquids that conduct electricity are solutions of acids, bases and salts.
Air is a poor conductor of electricity. But during thunderstorms air acts as conductor and electric current pass through it to reach the Earth. This happens due to a phenomenon termed as Dielectric Breakdown.
Helpful Links for CBSE Class 8 Science Preparation
Important Keywords from Chemical Effects of Electric Current
- LED (Light Emitting Diode): The device which is used in the tester in place of a bulb is called LED. It is used when a weak electric current flows through it and it starts to glow in a weak current.
- Tester: The instrument used to test whether any material is good conductor of or not electricity is called tester.
- Circuit: The closed path through which electric current passes from one part to another part is called an electric circuit.
Frequently Asked Questions (FAQs) on Chemical Effects of Electric Current Class 8 Assertion Reason
Q1: What are Assertion-Reason questions?
A1: Assertion-Reason questions are a type of question format used in CBSE exams where two statements are provided: an Assertion (A) and a Reason (R). Students need to determine whether each statement is true or false and if the Reason correctly explains the Assertion.
Q2: How do Assertion-Reason questions differ from other question types?
A2: Unlike multiple-choice questions, Assertion-Reason questions require students to analyze the relationship between two statements. It’s not just about knowing the facts but understanding how they connect logically.
Q3: What steps should I follow to correctly answer Assertion-Reason questions?
A3: Follow these steps:
Read both statements carefully. Understand what each statement is saying.
Determine the truth value of each statement. Decide if each statement is true or false independently.
Analyze the relationship. If both statements are true, decide whether the Reason (R) correctly explains the Assertion (A).
Choose the correct option. Based on your analysis, select the appropriate answer from the given options.
Q4: What options are typically provided for Assertion-Reason questions?
A4: The typical options are:
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, but R is not the correct explanation of A.
C. A is true, but R is false.
D. A is false, but R is true.
Q5: What should I check to determine if the Reason correctly explains the Assertion?
A5: Ensure that the Reason provides a logical explanation for the Assertion. Check if the Reason directly addresses the cause or basis of the Assertion and if they are contextually linked.
Q6: How can I improve my skills in answering Assertion-Reason questions?
A6: Practice regularly with sample questions and past papers. Focus on understanding the concepts thoroughly rather than rote memorization. Analyzing how different facts and concepts interrelate will enhance your ability to correctly answer these questions.
Q7: What are common mistakes to avoid when answering Assertion-Reason questions?
A7: Common mistakes include:
Not reading the statements carefully and missing key details.
Assuming the Reason explains the Assertion without checking the logical connection.
Confusing the order or relationship between the statements.
Overthinking and adding information not provided in the question.
Q8: What resources can help me practice Assertion-Reason questions?
A8: Use study guides specifically designed for Assertion-Reason questions. Online educational platforms and reference books for Class 8 Social Science also offer practice questions and explanations. xamcontent.com also provides assertion reason questions for cbse class 8 science.
