CBSE Class 6 Maths Chapter 2: Lines and Angles — Assertion & Reason
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The following Assertion and Reason questions are based on Chapter 2: Lines and Angles from the NCERT Class 6 Mathematics textbook. Each question has four options - read both the Assertion (A) and Reason (R) carefully before selecting your answer.
How to attempt Assertion & Reason questions:
(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.
(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.
Assertion & Reason Questions
1
Assertion (A): A point represents an exact location and has no length.
Reason (R): It is an ideal geometric object rather than a physical dot with size.
Reason (R): It is an ideal geometric object rather than a physical dot with size.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The idealisation explains why a point has no dimension.
2
Assertion (A): A point represents an exact location and has no length.
Reason (R): A line segment has two endpoints.
Reason (R): A line segment has two endpoints.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. Both statements are true, but the second statement does not explain the first.
3
Assertion (A): A point represents an exact location and has no length.
Reason (R): A point has measurable breadth.
Reason (R): A point has measurable breadth.
Answer: (c)
A is true, but R is false. A point has no breadth.
4
Assertion (A): A point extends infinitely in two directions.
Reason (R): It is an ideal geometric object rather than a physical dot with size.
Reason (R): It is an ideal geometric object rather than a physical dot with size.
Answer: (d)
A is false, but R is true. A line, not a point, extends indefinitely.
5
Assertion (A): A line extends endlessly in both directions.
Reason (R): It has no endpoints.
Reason (R): It has no endpoints.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Absence of endpoints permits extension both ways.
6
Assertion (A): A line extends endlessly in both directions.
Reason (R): A ray has one endpoint.
Reason (R): A ray has one endpoint.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. Both statements are true, but the second statement does not explain the first.
7
Assertion (A): A line extends endlessly in both directions.
Reason (R): A line has exactly two endpoints.
Reason (R): A line has exactly two endpoints.
Answer: (c)
A is true, but R is false. A line has no endpoints.
8
Assertion (A): A line segment extends endlessly in both directions.
Reason (R): It has no endpoints.
Reason (R): It has no endpoints.
Answer: (d)
A is false, but R is true. A segment has two endpoints and finite length.
9
Assertion (A): A ray has one endpoint and extends endlessly in one direction.
Reason (R): It begins at its endpoint and continues through another point.
Reason (R): It begins at its endpoint and continues through another point.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The starting point and one-way extension define a ray.
10
Assertion (A): A ray has one endpoint and extends endlessly in one direction.
Reason (R): A straight angle measures 180 degrees.
Reason (R): A straight angle measures 180 degrees.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. Both statements are true, but the second statement does not explain the first.
11
Assertion (A): A ray has one endpoint and extends endlessly in one direction.
Reason (R): A ray has two endpoints.
Reason (R): A ray has two endpoints.
Answer: (c)
A is true, but R is false. Only one endpoint is present.
12
Assertion (A): A ray has a fixed finite length.
Reason (R): It begins at its endpoint and continues through another point.
Reason (R): It begins at its endpoint and continues through another point.
Answer: (d)
A is false, but R is true. A ray continues indefinitely and has no fixed length.
13
Assertion (A): An acute angle measures less than 90 degrees.
Reason (R): A right angle is the 90-degree boundary between acute and obtuse angles.
Reason (R): A right angle is the 90-degree boundary between acute and obtuse angles.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The right-angle boundary explains the classification.
14
Assertion (A): An acute angle measures less than 90 degrees.
Reason (R): An obtuse angle is greater than 90 but less than 180 degrees.
Reason (R): An obtuse angle is greater than 90 but less than 180 degrees.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. Both statements are true, but the second statement does not explain the first.
15
Assertion (A): An acute angle measures less than 90 degrees.
Reason (R): Every acute angle is greater than 90 degrees.
Reason (R): Every acute angle is greater than 90 degrees.
Answer: (c)
A is true, but R is false. Acute angles are below 90 degrees.
16
Assertion (A): An angle of 120 degrees is acute.
Reason (R): A right angle is the 90-degree boundary between acute and obtuse angles.
Reason (R): A right angle is the 90-degree boundary between acute and obtuse angles.
Answer: (d)
A is false, but R is true. A 120-degree angle is obtuse.
17
Assertion (A): A protractor measures an angle using its centre and baseline.
Reason (R): The vertex is placed at the centre and one arm along the zero line.
Reason (R): The vertex is placed at the centre and one arm along the zero line.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Correct alignment makes the scale reading meaningful.
18
Assertion (A): A protractor measures an angle using its centre and baseline.
Reason (R): A compass draws circles.
Reason (R): A compass draws circles.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. Both statements are true, but the second statement does not explain the first.
19
Assertion (A): A protractor measures an angle using its centre and baseline.
Reason (R): The vertex may be placed anywhere without aligning the arms.
Reason (R): The vertex may be placed anywhere without aligning the arms.
Answer: (c)
A is true, but R is false. Misalignment gives an incorrect reading.
20
Assertion (A): A ruler alone directly measures an angle in degrees.
Reason (R): The vertex is placed at the centre and one arm along the zero line.
Reason (R): The vertex is placed at the centre and one arm along the zero line.
Answer: (d)
A is false, but R is true. A ruler measures length; a protractor measures angles.
❓ Frequently Asked Questions
What is covered in CBSE Class 6 Maths Chapter 2 Lines and Angles?
This chapter covers all key topics from Lines and Angles as per CBSE 2026-27 syllabus.
Is this Assertion & Reason useful for CBSE board exams?
Yes, designed for CBSE Class 6 board exam preparation covering the complete syllabus.
Are these CBSE Class 6 Maths Assertion & Reason updated for 2026-27?
Yes, all content at eBookPublisher is updated as per the latest 2026-27 CBSE syllabus.
How many chapters are in CBSE Class 6 Maths?
All chapters of CBSE Class 6 Maths are covered at eBookPublisher with free Assertion & Reason for each chapter.
Can I study Lines and Angles online for free?
Yes, complete Assertion & Reason for Lines and Angles is available free at eBookPublisher. Study online directly — no download needed.
Where can I get a complete Assertion & Reason book for CBSE Class 6 Maths?
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