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Question (11)

QN0018690

A quadrilateral has all four angles equal to 90°. It must be a:

(A) Rhombus only
(B) Rectangle
(C) Kite
(D) Trapezium

Correct Answer: B

Explanation:

Any quadrilateral with four right angles is a rectangle.

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Question (12)

QN0018691

If the diagonals of a quadrilateral are equal and bisect each other, the quadrilateral is a:

(A) Rectangle
(B) Kite
(C) Trapezium
(D) Pentagon

Correct Answer: A

Explanation:

Equal diagonals that bisect each other form a rectangle.

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Question (13)

QN0018692

In a rectangle, diagonal AC = 10 cm and diagonal BD = x cm. Find x.

(A) 5 cm
(B) 10 cm
(C) 15 cm
(D) 20 cm

Correct Answer: B

Explanation:

AC = BD in a rectangle.

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Question (14)

QN0018693

The diagonals of a square intersect at an angle of:

(A) 30°
(B) 45°
(C) 60°
(D) 90°

Correct Answer: D

Explanation:

Diagonals of a square are perpendicular.

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Question (15)

QN0018694

If the diagonals of a square intersect at O and AC = 20 cm, then AO =

(A) 5 cm
(B) 10 cm
(C) 20 cm
(D) 40 cm

Correct Answer: B

Explanation:

AO = AC ÷ 2 = 10 cm.

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Question (16)

QN0018695

Every square is a rectangle because:

(A) Its diagonals are unequal
(B) All its angles are 90°
(C) It has only two equal sides
(D) It has no diagonals

Correct Answer: B

Explanation:

A square has four right angles, so it is a rectangle.

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Question (17)

QN0018696

Which of the following is NOT always true for a rectangle?

(A) Opposite sides are equal
(B) Opposite sides are parallel
(C) All sides are equal
(D) Diagonals are equal

Correct Answer: C

Explanation:

A rectangle need not have all sides equal.

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Question (18)

QN0018697

A rectangle has length 15 cm and breadth 8 cm. What is its perimeter?

(A) 23 cm
(B) 46 cm
(C) 120 cm
(D) 38 cm

Correct Answer: B

Explanation:

Perimeter = 2(15 + 8) = 46 cm.

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Question (19)

QN0018698

A square has side 9 cm. Its perimeter is:

(A) 18 cm
(B) 27 cm
(C) 36 cm
(D) 81 cm

Correct Answer: C

Explanation:

Perimeter = 4 × 9 = 36 cm.

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Question (20)

QN0018699

A rectangle has opposite sides measuring 11 cm and 6 cm. Its perimeter is:

(A) 17 cm
(B) 22 cm
(C) 34 cm
(D) 66 cm

Correct Answer: C

Explanation:

Perimeter = 2(11 + 6) = 34 cm.

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Question (11)

A quadrilateral has all four angles equal to 90°. It must be a:

Explanation:

Link:

Question (12)

If the diagonals of a quadrilateral are equal and bisect each other, the quadrilateral is a:

Explanation:

Link:

Question (13)

In a rectangle, diagonal AC = 10 cm and diagonal BD = x cm. Find x.

Explanation:

Link:

Question (14)

The diagonals of a square intersect at an angle of:

Explanation:

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Question (15)

If the diagonals of a square intersect at O and AC = 20 cm, then AO =

Explanation:

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Question (16)

Every square is a rectangle because:

Explanation:

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Question (17)

Which of the following is NOT always true for a rectangle?

Explanation:

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Question (18)

A rectangle has length 15 cm and breadth 8 cm. What is its perimeter?

Explanation:

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Question (19)

A square has side 9 cm. Its perimeter is:

Explanation:

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Question (20)

A rectangle has opposite sides measuring 11 cm and 6 cm. Its perimeter is:

Explanation:

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