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Question (1)

QN009588

The perimeter of a circle is usually called its:

(A) Radius
(B) Diameter
(C) Circumference
(D) Chord

Correct Answer: C

Explanation:

Circumference is the perimeter of a circle.

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Question (2)

QN009589

The ratio of circumference to diameter of every circle is:

(A) 2
(B) 3
(C) π
(D) 22

Correct Answer: C

Explanation:

The constant ratio C/D is called π.

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Question (3)

QN009590

Which expression gives the circumference of a circle of radius r?

(A) πr²
(B) 2πr
(C) πd²
(D) r²

Correct Answer: B

Explanation:

Circumference = 2πr.

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Question (4)

QN009591

If the diameter of a circle is doubled, its circumference becomes:

(A) Half
(B) Four times
(C) Double
(D) Unchanged

Correct Answer: C

Explanation:

Circumference is directly proportional to diameter.

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Question (5)

QN009592

The value of π correct to two decimal places is:

(A) 3.41
(B) 3.14
(C) 3.04
(D) 3.44

Correct Answer: B

Explanation:

π ≈ 3.14.

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Question (6)

QN009593

Which statement is correct?

(A) π = 22/7 exactly
(B) π is a rational number
(C) π ≈ 22/7
(D) π terminates

Correct Answer: C

Explanation:

22/7 is only an approximation of π.

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Question (7)

QN009594

The circumference of a circle with diameter 14 cm is:

(A) 22 cm
(B) 44 cm
(C) 88 cm
(D) 66 cm

Correct Answer: B

Explanation:

C = πd = 22/7 × 14 = 44 cm.

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Question (8)

QN009595

A circle has radius 21 cm. Its circumference is:

(A) 66 cm
(B) 132 cm
(C) 44 cm
(D) 121 cm

Correct Answer: B

Explanation:

C = 2 × 22/7 × 21 = 132 cm.

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Question (9)

QN009596

If the circumference of a circle is 154 cm, then its radius is:

(A) 14 cm
(B) 21 cm
(C) 28 cm
(D) 7 cm

Correct Answer: C

Explanation:

2 × 22/7 × r = 154, so r = 28 cm.

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Question (10)

QN009597

The length of a semicircular arc of radius 14 cm is:

(A) 22 cm
(B) 44 cm
(C) 88 cm
(D) 66 cm

Correct Answer: B

Explanation:

Semicircular arc = πr = 44 cm.

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Question (1)

The perimeter of a circle is usually called its:

Explanation:

Link:

Question (2)

The ratio of circumference to diameter of every circle is:

Explanation:

Link:

Question (3)

Which expression gives the circumference of a circle of radius r?

Explanation:

Link:

Question (4)

If the diameter of a circle is doubled, its circumference becomes:

Explanation:

Link:

Question (5)

The value of π correct to two decimal places is:

Explanation:

Link:

Question (6)

Which statement is correct?

Explanation:

Link:

Question (7)

The circumference of a circle with diameter 14 cm is:

Explanation:

Link:

Question (8)

A circle has radius 21 cm. Its circumference is:

Explanation:

Link:

Question (9)

If the circumference of a circle is 154 cm, then its radius is:

Explanation:

Link:

Question (10)

The length of a semicircular arc of radius 14 cm is:

Explanation:

Link:

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