Mathematics

MCQ | Class 09 | Chapter 8
Quadrilaterals

Features

Action Plan

MCQ | CHAPTER – 8 | CLASS IX
QUADRILATERAL

Q1) The quadrilateral whose all its sides
are equal and angles are equal to 90 degrees, it is called:

a) Rectangle

b) Square

c) Kite

d) Parallelogram

Answer: b

Q2) Quadrilateral has __________ sides.
a) one
b) two
c) three
d) four

Answer:  d

Q3) The sum of all the angles of a quadrilateral
is equal to:

a) 180°

b) 270°

c) 360°

d) 90°

Answer: c

Q4) The sum of four angles of quadrilateral is equal
to _______
a) 90°
b) 360°
c) 180°
d) 270°

Answer:  b

Q5) A trapezium has:

a) One pair of opposite sides parallel

b) Two pairs of opposite sides parallel to each other

c) All its sides are equal

d) All angles are equal

Answer: a

Q6) Find the value of x.

a) 105°
b) 50°
c) 60°
d) 90°

Answer:  a

Q7) A
rhombus can be a:

a) Parallelogram

b) Trapezium

c) Kite

d) Square

Answer: d

Q8) At which angle do diagonals of a rhombus bisects
each other?
a) 180°
b) 360°
c) 270°
d) 90°

Answer:  d

Q9) A diagonal of a parallelogram divides it
into two congruent:

a) Square

b) Parallelogram

c) Triangles

d) Rectangle

Answer: c

Q10) What is the quadrilateral formed by the angle
bisectors of a parallelogram?
a) Square
b)
Rectangle
c) Circle
d) Rhombus

Answer:  b

Q11) In a parallelogram, opposite angles are:

a) Equal

b) Unequal

c) Cannot be determined

d) None of the above

Answer: a

Q12) Find the value of x if PQRS is a parallelogram.

a) 150°
b) 50°
c) 60°
d) 120°

Answer:  c

Q13) The diagonals of a parallelogram are

a) Equal

b) Unequal

c) Bisect each other

d) Have no relation

Answer: c

Q14) From the figure find
the length of AD if perimeter of parallelogram ABCD is 26cm.

a) 10 cm
b) 15 cm
c) 12 cm
d) 5 cm

Answer:  d

Q15) Each angle of the rectangle is:

a) More than 90°

b) Less than 90°

c) Equal to 90°

d) Equal to 45°

Answer: c

Q16) The angles of a quadrilateral are in
the ratio 4 : 5 : 10 : 11. The angles are:

a) 36°, 60°, 108°, 156°

b) 48°, 60°, 120°, 132°

c) 52°, 60°, 122°, 126°

d) 60°, 60°, 120°, 120°

Answer: b

Explanation:

As per
angle sum property, we know:

4x+5x+10x+11x = 360°

30x = 360°

x = 12°

Hence, angles are

4x = 4 (12) = 48°

5x = 5 (12) = 60°

10x = 10 (12) = 120°

11x = 11 (12) = 132°

Q17) If ABCD is a trapezium in which AB || CD
and AD = BC, then:

a) ∠A = ∠B

b) ∠A > ∠B

c) ∠A < ∠B

d) None of the above

Answer: a

Explanation : See Q12 Exercise 8.1 NCERT

Q18)
Which of the following is not true for a parallelogram?

a) Opposite
sides are equal

b) Opposite
angles are equal

c) Opposite
angles are bisected by the diagonals

d)
Diagonals bisect each other.

Answer: c

Q19) If the ratio of four angles of a quadrilateral is ∠A : ∠B : ∠C : ∠D = 1 : 2 : 3 : 4, what
is the value of ∠C?
a) 90°
b) 108°
c) 180°
d) 72°

Answer:  b

Q20) Three angles of a quadrilateral are 75º,
90º and 75º. The fourth angle is

a) 90º

b) 95º

c) 105º

d) 120º

Answer: d

Explanation:
We know that the sum of angles of a quadrilateral is 360º.

Let the
unknown angle be x.

Therefore,
75º + 90º + 75º + x = 360º

x = 360º –
240º = 120º.

Q21) What is the length of
DE if DE || BC and D and E are midpoints of AB and AC?

a) 18cm
b) 15cm
c) 9cm
d) 20cm

Answer:  c  (9 cm)

Q22) ABCD is a rhombus such that ∠ACB = 40º. Then ∠ADB is

(a) 40º

(b) 45º

(c) 50º

(d) 60º

Answer: c

Explanation:
We know that the diagonals of the rhombus bisect each other perpendicularly.

By using
the alternate interior angles, and angle sum property of triangle, we can say:

From the
triangle, BOC,

∠BOC + ∠OCB + ∠OBC = 180º

(where 
∠BOC= 90º, ∠OCB = 40º)

90º + 40º + ∠OBC = 180º

∠OBC = 180º – 130º

∠OBC = 50º

∠OBC =∠DBC

Now, by
using alternate angles, we can say

∠ADB = 50º

Q23)  Find the perimeter of
ΔABC, if perimeter of ΔPQR is 36cm and A, B and C are midpoints.

a) 9cm
b) 18cm
c) 20cm
d) 36cm

Answer:  b

Q24) The quadrilateral formed by joining the mid-points
of the sides of a quadrilateral PQRS, taken in order, is a rhombus, if

a) PQRS is
a rhombus

b) PQRS is
a parallelogram

c)
Diagonals of PQRS are perpendicular

d)
Diagonals of PQRS are equal.

Answer: d

Explanation:
The quadrilateral formed by joining the mid-points of the sides of a
quadrilateral PQRS, taken in order, is a rhombus if the diagonals of PQRS are
equal.

Q25) A diagonal of a
parallelogram divides it into two congruent:

a. Square

b. Parallelogram

c. Triangles

d. Rectangle

Answer c

Q26) A diagonal of a rectangle is inclined to
one side of the rectangle at 25º. The acute angle between the diagonals is

a) 25º

b) 40º

c) 50º

d) 55º

Answer: c

Explanation:
Consider the rectangle ABCD

In a
triangle BOC, 

∠OBC = ∠OCB (Opposite angles of isosceles triangle)

Therefore, ∠OBC + ∠OCB + ∠BOC = 180º

25º + 25º + ∠BOC = 180º

∠BOC = 180º- 50º

∠BOC = 130º.

By using
the linear pair, 

∠AOB + ∠BOC = 180º

∠AOB = 180º – 130º

∠AOB= 50º

Hence, the
acute angle between the diagonals is 50º.

Q27) In a parallelogram,
opposite angles are:

a. Equal

b. Unequal

c. Cannot be determined

d. None of the above

Answer a

Q28) If angles A, B, C and D of the quadrilateral
ABCD, taken in order, are in the ratio 3 : 7 : 6 : 4, then ABCD is a

a) Kite

b) Rhombus

c)
Parallelogram

d) Trapezium

Answer: d

Explanation: Given that,
the angles A, B, C and D of a quadrilateral are in the ratio 3 : 7 : 6 : 4.

We know
that A + B + C + D = 360º

Hence, now
we can assume, 3x + 7x + 6x + 4x = 360º

20x = 360º

x=18º

Therefore,
A = 3x = 54º

B = 7x =
126º

C = 6x =
108º

D = 4x= 72º

Here ∠A + ∠B = 180^o

 ⇒ AD ॥ BC

And ∠C + ∠D = 180^o

 ⇒ AD ॥ BC

⇒ ABCD is a quadrilateral with
one pair of opposite sides are parallel.

⇒ ABCD is a trapezium

Q29) The quadrilateral formed by joining
the mid-points of the sides of a quadrilateral PQRS, taken in order, is a
rectangle, if

a) PQRS is
a rectangle

b) PQRS is
a parallelogram

c)
Diagonals of PQRS are perpendicular

d)
Diagonals of PQRS are equal

Answer: c

Explanation:
The quadrilateral formed by joining the mid-points of the sides of a
quadrilateral PQRS, taken in order, is a rectangle, if the diagonals of PQRS
are perpendicular.

Q30) Each angle of rectangle
is:

a. More than 90°

b. Less than 90°

c. Equal to 90°

d. Equal to 45°

Answer c

Q31) The figure obtained by joining the
mid-points of the sides of a rhombus, taken in order, is

a) a square

b) a rhombus

c) a
rectangle

d) any
parallelogram

Answer: c

Explanation:
See Q2 NCERT Ex- 8.2

Let ABCD be
a rhombus. P, Q, R, S be the midpoint of the sides AB, BC, CD and DA. If we
join the midpoints, we will get the shape rectangle.

Q32) If APB and CQD are two parallel lines, then
the bisectors of the angles APQ, BPQ, CQP and PQD form

a) Square

b) Rectangle

c) Rhombus

d) any
other parallelogram

Answer: b

Explanation: Hence, the
bisectors of the angles APQ, BPQ, CQP and PQD form the shape rectangle.

Q33) Which of the following is not a
quadrilateral?

a) Kite

b) Square

c) Triangle

d) Rhombus

Answer: c

Download Math MCQ Worksheet For Class IX

THANKS FOR YOUR VISIT

PLEASE COMMENT BELOW