RBSE Class 7 Maths Important Questions Chapter 14 Symmetry

Rajasthan Board RBSE Class 7 Maths Important Questions Chapter 14 Symmetry Important Questions and Answers.

RBSE Class 7 Maths Chapter 14 Important Questions Symmetry

Multiple Choice Questions

Question 1.
A circle has :
(a) One line of symmetry
(b) Two lines of symmetry
(c) No line of symmetry
(d) An unlimited number of lines of symmetry
Answer:
(d) An unlimited number of lines of symmetry

Question 2.
For a line segment axis of symmetry is :
(a) Perpendicular at any point
(b) Perpendicular bisector
(c) Not possible
(d) None of these
Answer:
(b) Perpendicular bisector

Question 3.
Which one of the following English alphabets has horizontal line of symmetry?
(a) M
(b) Y
(c) V
(d) E
Answer:
(d) E

Question 4.
What is the order of rotational symmetry for a square?
(a) 2
(b) 4
(c) 3
(d) None of these
Answer:
(b) 4

Question 5.
The letter O of the English alphabet has :
(a) No line of symmetry
(b) One line of symmetry
(c) Two lines of symmetry
(d) Infinite lines of symmetry.
Answer:
(d) Infinite lines of symmetry.

Fill in the Blanks

Question 1.
A regular polygon has all its side of __________ length.
Answer:
equal

Question 2.
An equilateral triangle has ____________ lines of symmetry.
Answer:
3

Question 3.
A regular hexagon has ____________ lines of symmetry.
Answer:
6

Question 4.
_____________ is the most perfect symmetrical figure.
Answer:
circle

Question 5.
For an equilateral triangle angle of rotation is ____________ .
Answer:
120°

State whether True or False

Question 1.
A rectangle has no line of symmetry.
Answer:
False

Question 2.
An equilateral triangle has no rotational symmetry.
Answer:
False

Question 3.
Every trapezium has a line of symmetry.
Answer:
False

Question 4.
A scalene triangle has neither a line of symmetry nor a rotational symmetry.
Answer:
True

Question 5.
The letter H has one line of symmetry.
Answer:
False

Very Short Answer Type Questions

Question 1.
From the letters A, B, C, D, E, F, G, H, I, J, name the letters whose shape remains same in mirror
Answer:
A, H, I.

Question 2.
How many symmetric lines are in a semi-circle ?
Answer:
One.

Question 3.
Give an example of quadrilateral having line symmetry but no more than 1 order of rotational symmetry.

Answer:
Isosceles trapezium.

Short Answer Type Questions

Question 1.
Draw lines of symmetry of the following figures and find their number. Also write the names of the figure.

Answer:
(i) Equilateral triangle 3 symmetric lines

(ii) Square 4 symmetric lines

(iii) Regular pentagon 5 symmetric lines

(iv) Regular hexagon 6 symmetric lines

Question 2.
Complete the following figures using concept of symmetric lines:

Answer:

Question 3.
Find the order of rotational symmetry in the given figures of windmill:

Answer:

In the given windmill the order of rotational symmetry in an follows:
In a full turn, those are four positions (on rotation through the angles 90°, 180°, 270° and 360°) when the windmill looks exactly the same. Hence order of rotational symmetry is 4.