CLASS VI (MATHS) (GANIT PRAKASH) CH - LINES AND ANGLES

What is the degree measure of a straight angle?

• 90⁰

• 180⁰

• 360⁰

• 0⁰

Answer explanation

A straight angle is defined as an angle that measures exactly 180 degrees. It represents a straight line, making the correct answer 180⁰.

Which angle is larger ?

• Acute angle

• Obtuse angle

• Reflex angle

• Straight angle

Answer explanation

A reflex angle is larger than 180 degrees but less than 360 degrees, making it the largest among the options. An obtuse angle is between 90 and 180 degrees, while acute and straight angles are smaller.

A protractor is used to

• draw circles

• measure line segments

• measure angles in degrees

• fold papers in two halves

Answer explanation

A protractor is specifically designed to measure angles in degrees, making it an essential tool in geometry. The other options do not accurately describe the primary function of a protractor.

What is the common end points of two rays called?

• Vertex

• Line segment

• angle

• base

Answer explanation

The common endpoint of two rays is called a vertex. This point is where the rays meet and is essential in defining angles, which are formed by two rays sharing a vertex.

what is the degree measure of a full rotation?

• 90⁰

• 180⁰

• 360⁰

• 270⁰

Answer explanation

A full rotation in a circle is measured as 360 degrees. This means that if you rotate around a point and return to your starting position, you have completed a full rotation of 360⁰.

A line can be extended

• in one direction only

• between two fixed points

• indefinitely in both directions

• only to the left

Answer explanation

A line is defined as extending indefinitely in both directions, which means it has no endpoints. This is why the correct answer is 'indefinitely in both directions', as it accurately describes the nature of a line.

How many right angles make a straight angle

• 1

• 2

• 3

• 4

Answer explanation

A straight angle measures 180 degrees. Since a right angle measures 90 degrees, two right angles (90 + 90) combine to form a straight angle. Therefore, the correct answer is 2.

Number of lines which can be drawn from one point is

• 1

• 2

• 100

• infinite

Answer explanation

From a single point, you can draw lines in any direction. Since there are infinitely many directions, the number of lines that can be drawn from one point is infinite.

No. of obtuse angles in the given figure is

• 2

• 3

• 4

• 5

Answer explanation

In the given figure, there are 4 angles that measure more than 90 degrees, which are classified as obtuse angles. Therefore, the correct answer is 4.

The no. of line segments in the given figure is

• 5

• 10

• 4

• 8

Answer explanation

The figure contains 10 line segments, which can be counted by identifying each distinct segment connecting points. Therefore, the correct answer is 10.