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Important Questions: Lines and Angles - Class 7 MCQ


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20 Questions MCQ Test Mathematics (Maths) Class 7 - Important Questions: Lines and Angles

Important Questions: Lines and Angles for Class 7 2024 is part of Mathematics (Maths) Class 7 preparation. The Important Questions: Lines and Angles questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions: Lines and Angles MCQs are made for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions: Lines and Angles below.
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Important Questions: Lines and Angles - Question 1

Which of the following are the units of an angle?

Detailed Solution for Important Questions: Lines and Angles - Question 1

A common unit of measurement of angles is degrees.

Important Questions: Lines and Angles - Question 2

What do we call an angle which exactly measures 90o?             

Detailed Solution for Important Questions: Lines and Angles - Question 2

An angle which exactly measures 90is called a right angle. 

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Important Questions: Lines and Angles - Question 3

What do we call an angle whose measurement is exactly equal to 0o?               

Detailed Solution for Important Questions: Lines and Angles - Question 3
  • A zero angle is defined as an angle that measures exactly 0 degrees.
  • It represents a situation where two rays or lines overlap completely, resulting in no visible angle.
  • This makes it distinct from other types of angles:

    • Obtuse angles are greater than 90 degrees.
    • Straight angles measure exactly 180 degrees.
    • Right angles measure exactly 90 degrees.
  • Thus, the correct term for an angle measuring 0 degrees is a zero angle.
Important Questions: Lines and Angles - Question 4

What is an angle which measures exactly 180o called?

Detailed Solution for Important Questions: Lines and Angles - Question 4
A straight angle is defined as an angle that measures exactly 180 degrees. Here are some key points about straight angles:

  • It forms a straight line when drawn.
  • It divides the plane into two equal halves.
  • In contrast, a zero angle measures 0 degrees, a right angle measures 90 degrees, and an acute angle is less than 90 degrees.
  • Straight angles are commonly seen in everyday objects, like the edges of a ruler.
Important Questions: Lines and Angles - Question 5

Which instrument is used to measure or construct angles?

Detailed Solution for Important Questions: Lines and Angles - Question 5

A protractor is a measuring instrument, typically made of transparent plastic or glass, for measuring angles. Most protractors measure angles in degrees (°). Radian-scale protractors measure angles in radians.

Important Questions: Lines and Angles - Question 6

How many rays can be drawn from a given point?

Detailed Solution for Important Questions: Lines and Angles - Question 6

An infinite number of rays can be drawn from a point. 

Important Questions: Lines and Angles - Question 7

What do we call a 169o angle?

Detailed Solution for Important Questions: Lines and Angles - Question 7

An angle which lies between 90and 180o  is called as an obtuse angle. So, 169o  is an obtuse angle.

Important Questions: Lines and Angles - Question 8

What happens to the measurement of an angle after the extension of its arms?

Detailed Solution for Important Questions: Lines and Angles - Question 8

Extending the arms of an angle does not affect the angle between them.

Important Questions: Lines and Angles - Question 9

In ∠ROP, what is the vertex? 

Detailed Solution for Important Questions: Lines and Angles - Question 9

The vertex of an angle is the common point of the rays that form the arms of an angle. Here, it is O.

Important Questions: Lines and Angles - Question 10

What are the two arms of ∠DEF? 

Detailed Solution for Important Questions: Lines and Angles - Question 10

 are the two arms of ∠DEF.

Important Questions: Lines and Angles - Question 11

When two line segments meet at a point forming right angles, what type of segments are they called?

Detailed Solution for Important Questions: Lines and Angles - Question 11

Perpendicular segments meet at a point forming right angles.

Important Questions: Lines and Angles - Question 12

How is  is perpendicular to written symbolically?

Detailed Solution for Important Questions: Lines and Angles - Question 12

 

Important Questions: Lines and Angles - Question 13

 What is the measure of ∠QOR ? 

Detailed Solution for Important Questions: Lines and Angles - Question 13

The correct option is Option C.

If OQ is perpendicular on PR, it means it forms right angles on both the sides. 

∠QOP = ∠QOR = 180° ÷ 2 = 90°

Important Questions: Lines and Angles - Question 14

A line AB is parallel to the line CD. How is this symbolically written?

Important Questions: Lines and Angles - Question 15

What are the lines which lie on the same plane and do not intersect at any point called?

Detailed Solution for Important Questions: Lines and Angles - Question 15

Since parallel lines are the lines which have equal distance throughout. So they never meet because they have constant distance between them.

Important Questions: Lines and Angles - Question 16

When two lines are parallel, what is the distance between them?

Detailed Solution for Important Questions: Lines and Angles - Question 16

The distance between the parallel  lines is the same. 

Important Questions: Lines and Angles - Question 17

What is the number of pairs of parallel lines in the given figure? 

Detailed Solution for Important Questions: Lines and Angles - Question 17

There are two pairs of parallel lines as the opposite sides of a rectangle are parallel.PS || QR and PQ || RS

Important Questions: Lines and Angles - Question 18

What is the complementary angle of 20o?

Detailed Solution for Important Questions: Lines and Angles - Question 18

Complementary angles add up to 90o . ∠PQR = 20⇒  Its complementary angle is 90o−20= 70o

Important Questions: Lines and Angles - Question 19

What is the supplementary angle of 120o?

Detailed Solution for Important Questions: Lines and Angles - Question 19

The supplementary angle of a given angle is what, when added to the given angle, equals 180°.

To find the supplementary angle of 120°:

180°−120°=60°

So, the supplementary angle of 120° is 60°.

Answer: 3 (60°)

Important Questions: Lines and Angles - Question 20

What is the measure of a comple-mentary angle of an angle greater than 45o?

Detailed Solution for Important Questions: Lines and Angles - Question 20

Since the complementary angle of 45° is 45°, if the angle is greater than 45° its complement will be lesser than 45°.

Let complementary angles be x and y,
We know The sum of complementary angle 90degree. Then,
=x+y=90
From the given, we know that
x>45
adding y on both the sides,
=x+y>45+y
=90>45+y
=90–45>y
=y<45

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