MCQ on Lines and Angles | Class 9 Mathematics Chapter 6

Welcome to MCQ Assam School. This post contains 30 MCQs (Multiple Choice Questions) on the Class 9 Mathematics Chapter 6. The name of the chapter is “Lines and Angles”. So, basically, this post contains 30 MCQs on Lines and Angles. These MCQs will help you to understand the chapter better and will also help you prepare for your exam.

The Chapter deals with the following topics:

1. Definitions of line segments, rays, and lines
2. Types of angles (acute, right, obtuse, straight, reflex)
3. Complementary and supplementary angles
4. Adjacent and linear pair of angles
5. Vertically opposite angles
6. Linear Pair Axiom
7. Theorem on vertically opposite angles
8. Theorem on parallel lines, etc

These MCQs can also act as a Mock Test. There are 30 MCQs. There are four options for each question. Out of the four options, only one option is correct. Choose the correct options for each question and click on the submit button to see the results. You can also, review your answers. For each right option, you will see a green check mark and for each wrong option, you will see a red cross mark. If the chosen option is wrong then a green check mark will appear near the right option. This way you will know the right answer.

Let’s begin.

30 MCQs on Lines and Angles for Class 9 Maths Chapter 6

1. What is the measure of an acute angle?

A. 0° to 90° B. 90° to 180° C. 180° to 360° D. Exactly 90°

2. When two lines intersect, what is true about vertically opposite angles?

A. They are always supplementary B. They are equal C. They are complementary D. They are always 90°

3. What is the sum of two adjacent angles when a ray stands on a line?

A. 90° B. 180° C. 360° D. 270°

4. Which type of angle is exactly 90°?

A. Acute angle B. Obtuse angle C. Right angle D. Reflex angle

5. What are two angles called if their sum is 90°?

A. Supplementary angles B. Linear pair angles C. Vertically opposite angles D. Complementary angles

6. A straight angle measures exactly how many degrees?

A. 90° B. 180° C. 270° D. 360°

7. What range of degrees defines a reflex angle?

A. 0° to 90° B. 180° to 360° C. 90° to 180° D. 360° to 720°

8. What is a requirement for two angles to be considered adjacent?

A. Same measurement B. Common vertex and common arm C. Always supplementary D. Always complementary

9. If two lines are parallel to the same line, what can be concluded?

A. They are also parallel to each other B. They intersect at a point C. They form right angles D. They are always perpendicular

10. What are two angles called if their sum is 180°?

A. Complementary angles B. Supplementary angles C. Adjacent angles D. Vertically opposite angles

11. When three or more points lie on the same line, they are called:

A. Collinear points B. Non-collinear points C. Parallel points D. Intersecting points

12. What is the range of an obtuse angle?

A. 0° to 90° B. 180° to 360° C. 90° to 180° D. 360° to 720°

13. What type of lines have the same distance between them at all points?

A. Intersecting lines B. Perpendicular lines C. Parallel lines D. Skew lines

14. What do we call two non-common arms lying on opposite sides of the common arm?

A. Linear pair B. Supplementary angles C. Complementary angles D. Adjacent angles

15. In an angle bisector, the original angle is divided into how many equal parts?

A. Three parts B. Two parts C. Four parts D. One part

16. When two lines cross each other, how many pairs of vertically opposite angles are formed?

A. One pair B. Two pairs C. Three pairs D. Four pairs

17. Which of the following is NOT a type of angle defined in the chapter?

A. Acute angle B. Obtuse angle C. Scalene angle D. Reflex angle

18. If lines are parallel to the same line, they must be:

A. Parallel to each other B. Intersecting C. Perpendicular D. Skew

19. What is the key characteristic of adjacent angles?

A. Always 90° B. Common vertex and one common arm C. Always intersecting D. Always supplementary

20. What is the total number of degrees when four rays originate from the same point?

A. 180° B. 270° C. 270° D. 360°

21. Which axiom discusses the relationship between a ray standing on a line?

A. Angle Bisector Axiom B. Linear Pair Axiom C. Parallel Lines Axiom D. Vertically Opposite Axiom

22. In a pair of vertically opposite angles, the two angles are always:

A. Supplementary B. Equal C. Complementary D. Adjacent

23. Lines perpendicular to parallel lines are:

A. Always intersecting B. Never perpendicular C. Also parallel to each other D. Skew lines

24. What is the sum of a pair of supplementary angles?

A. 90° B. 270° C. 180° D. 360°

25. What is the sum of complementary angles?

A. 180° B. 90° C. 360° D. 270°

26. When a ray bisects an angle, what happens to the original angle?

A. It increases B. It is divided into two equal parts C. It is eliminated D. It remains unchanged

27. What is the fundamental difference between a line segment and a ray?

A. Length B. Width C. Number of end points D. Color

28. What characterizes parallel lines?

A. They intersect at one point B. They form right angles C. They maintain equal distance at all points D. They converge at infinity

29. What is the primary characteristic of a transversal?

A. It intersects two or more lines B. It is always parallel C. It forms right angles D. It is perpendicular to all lines

30. In a linear pair of angles, what is special about their sum?

A. Always 90° B. Always 270° C. Always 360° D. Always 180°

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• MCQ on Coordinate Geometry | Class 9 Mathematics Chapter 3
• MCQ on Linear Equations in Two Variables | Class 9 Mathematics Chapter 4
• MCQ on Introduction to Euclid’s Geometry | Class 9 Mathematics Chapter 5

The Bottom Line

I hope these 30 Multiple-choice questions have helped you learn more about Class 9 Mathematics Chapter 6 (Lines and Angles ) in detail. You can retake the test anytime you want by refreshing the page and review your results.

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Abdur Rohman

Abdur Rohman is an Electrical Engineer from Charaideo, Assam, who wears multiple hats as a part-time teacher, blogger, entrepreneur, and digital marketer. Passionate about education, he founded The Assam School blog to provide free, comprehensive textbook solutions, MCQs (Multiple Choice Questions), and other academic content for students from Class V to XII.