Lines and Angles — Quiz

Q1. Ravi writes a line segment as AB while Priya writes the same line segment as BA. Which statement is correct?

• A. Ravi is right; BA is not a valid name for the same segment
• B. Priya is right; AB cannot name the segment
• C. Both names are valid and denote the same line segment
• D. Both are wrong; only the symbol l can name a segment

Q2. Apart from naming it through two points, a line can also be denoted by

• A. A capital letter such as A or B
• B. A small letter such as l or m
• C. Any digit such as 1 or 2
• D. A Greek symbol such as π or θ

Q3. Sheetal marks two distinct points on a piece of paper. How many different lines can she draw that pass through both of these points?

• A. Exactly one line
• B. Exactly two lines
• C. Exactly three lines
• D. Infinitely many lines

Q4. Why is the ray AB not the same as the ray BA?

• A. Because the lengths AB and BA are different
• B. Because they start at different points and extend in opposite directions
• C. Because rays cannot be named by letters at all
• D. Because BA is not a valid name for any ray

Q5. In Fig. 2.5 of the chapter, four rays start from T and pass through points A, N, B and another marked point. Which of these is NOT a valid ray starting at T?

• A. Ray TA
• B. Ray TB
• C. Ray TN
• D. Ray NB

Q6. An angle has its vertex at B and arms passing through D and E. When the angle is named using three letters, the vertex letter must be

• A. Written first
• B. Written in the middle
• C. Written last
• D. Skipped from the name

Q7. In a figure, three rays start from a common point P and pass through A, B and C. Why can the angle APB not simply be called angle P?

• A. Because P is not a valid vertex name
• B. Because more than one angle is formed at the vertex P, so we must specify the arms
• C. Because angles are never named using a single letter
• D. Because A and B must always be written before P

Q8. The size of an angle is best described as

• A. The total length of its two arms
• B. The shortest distance between the two endpoints of the arms
• C. The amount of rotation needed about the vertex to move one arm onto the other
• D. The area enclosed between the two arms

Q9. If the two arms of an angle are made longer without changing the rotation between them, the measure of the angle

• A. Becomes larger
• B. Becomes smaller
• C. Stays exactly the same
• D. Becomes zero

Q10. The measure of a right angle in degrees is

• A. 45°
• B. 90°
• C. 180°
• D. 360°

Q11. The chapter says that a right angle resembles the shape of which English letter?

• A. L
• B. U
• C. V
• D. O

Q12. Which of the following angle measures is an example of an acute angle?

• A. 110°
• B. 130°
• C. 75°
• D. 180°

Q13. Which of the following angle measures is an example of an obtuse angle?

• A. 40°
• B. 90°
• C. 130°
• D. 195°

Q14. A reflex angle is an angle whose measure is

• A. Less than 90°
• B. Between 90° and 180°
• C. Exactly 180°
• D. Greater than 180° and less than 360°

Q15. The measure of one full turn in degrees is

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