Last Updated on July 26, 2024 by XAM CONTENT
Hello students, we are providing assertion and reason questions for class 11 physics. 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 11 physics. In this article, you will find assertion reason questions for CBSE Class 11 Physics Chapter 2 Units and Measurements.
| Chapter | Units and Measurements |
| Type of Questions | Assertion Reason Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 11 |
| Subject | Physics |
| Useful for | Class 11 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 11 Physics Chapterwise Assertion Reason |
Assertion Reason Questions on Units and Measurements
Directions:
For below questions, two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) are as given below.
(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 and R is also false.
Q. 1. Assertion: Unit chosen for measuring physical quantities should not be easily reproducible.
Reason: Unit should change with the changing physical conditions like temperature, pressure, etc.
Difficulty Level: Medium
Ans. Option (d) is correct.
Q. 2. Assertion: The unit used for measuring nuclear cross-section is ‘barn’.
Reason: 1 barn 10-14 m2.
Difficulty Level: Medium
Ans. Option (c) is correct.
Q. 3. Assertion: When we change the unit of measurement of a quantity, its numerical value changes.
Reason: Smaller the unit of measurement smaller is its numerical value
Difficulty Level: Easy
Ans. Option (c) is correct
Q. 4. Assertion: Parallax method is used for measuring distances of nearby stars only.
Reason: With increase in the distance of star from earth, the parallactic angle becomes too small to be measured accurately.
Difficulty Level: Medium
Ans. Option (a) is correct.
Q. 5. Assertion: Out of two measurements l=0.7 m and l=0.70 m, the second one is more accurate.
Reason: In every measurement, the last digit is not accurately known.
Difficulty Level: Easy
Ans. Option (b) is correct.
Also check
- Motion in a Straight Line Class 11 Assertion Reason Questions Physics Chapter 3
- Units and Measurements Class 11 Assertion Reason Questions Physics Chapter 2
Topics from which assertion reason questions may be asked
- Need for measurement
- Units of measurement; systems of units; SI units, fundamental and derivedunits.
- Length, mass and time measurements
- Accuracy and precision of measuring instruments
- Errors inmeasurement
- Significant figures.
- Dimensions of physical quantities
- Dimensional analysis and its applications.
The process of measurement is basically a comparison process. To measure a physical quantity, we have to find out how many times a standard amount of that physical quantity is present in the quantity being measured. The number thus obtained is known as the magnitude and the standard chosen is called the unit of the physical quantity.
You are going to study the above topics in class 11 Units and Measurement chapter. So, assertion reason questions based on above topics may be asked.
We hope the given Assertion and Reason Questions for Units and Measurements Class 11 Physics helps you in your learning.
Frequently Asked Questions (FAQs) on Units and Measurements Assertion Reason Questions
Q1: What are assertion-reason questions?
A1: Assertion-reason questions consist of two statements: an assertion (A) and a reason (R). The task is to determine the correctness of both statements and the relationship between them. The options usually include:
(i) Both A and R are true, and R is the correct explanation of A.
(ii) Both A and R are true, but R is not the correct explanation of A.
(iii) A is true, but R is false.
(iv) A is false, but R is true. or A is false, and R is also false.
Q2: Why are assertion-reason questions important in Physics?
A2: Assertion-reason questions are important in Physics because they test not only the factual knowledge of students but also their understanding of the concepts and the ability to relate different pieces of information. They encourage critical thinking and deeper comprehension of the subject matter.
Q3: How can practicing assertion-reason questions help students?
A3: Practicing assertion-reason questions can help students in several ways:
Improved Conceptual Understanding: It helps students to better understand the concepts by linking assertions with their reasons.
Enhanced Analytical Skills: It enhances analytical skills as students need to critically analyze the statements and their relationships.
Better Exam Preparation: These questions are asked in exams, and practicing them can improve your performance.
Q4: What strategies should students use to answer assertion-reason questions effectively?
A4: Students can use the following strategies:
Understand Each Statement Separately: Determine if each statement is true or false independently.
Analyze the Relationship: If both statements are true, check if the reason correctly explains the assertion.
Q5: What are common mistakes to avoid when answering Assertion-Reason questions?
A5: 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.
Q6: What resources can help me practice Assertion-Reason questions?
A6: Use study guides specifically designed for Assertion-Reason questions. Online educational platforms and reference books for Class 11 Physics also offer practice questions and explanations. xamcontent.com also provides assertion reason questions for cbse class 11 physics.
Q7: Explain the difference between uniform velocity and variable velocity.
A7: If a body travels equal displacements in equal intervals of time, then the velocity of body is uniform velocity. On the other hand, if the body covers unequal displacements in equal intervals of time, then its velocity is variable velocity.
Q8: Can Earth be regarded as a ‘point object’ if only the orbital motion of Earth around the sun is
considered?
A8: Yes. This is because the size of the Earth is very small as compared to the size of the orbit of the Earth around the sun.
