Class 9 Maths Chapter 5 MCQs with Answers – I’m Up and Down, and Round and Round

Class 9 Maths Chapter 5 MCQs

Question 1. What is the distance from the centre of a circle to any point on its circumference called?

A. Diameter

B. Radius

C. Chord

D. Arc

Question 2. If the radius of a circle is 7 cm, what is its diameter?

A. 3.5 cm

B. 7 cm

C. 14 cm

D. 49 cm

Question 3. Which line segment passes through the centre of a circle and has both endpoints on the circle?

A. Radius

B. Chord

C. Diameter

D. Arc

Question 4. If the diameter of a circle is 20 cm, what is its radius?

A. 5 cm

B. 10 cm

C. 20 cm

D. 40 cm

Question 5. Which formula gives the circumference of a circle with radius r?

A. πr²

B. 2πr

C. πr

D. 4πr²

Question 6. What is the area of a circle with radius 3 cm?

A. 6π cm²

B. 9π cm²

C. 12π cm²

D. 18π cm²

Question 7. A circle has a diameter of 14 cm. Using π = 22/7, what is its circumference?

A. 22 cm

B. 28 cm

C. 44 cm

D. 154 cm

Question 8. How many radii are equal to one diameter?

A. One

B. Two

C. Three

D. Four

Question 9. A chord that passes through the centre of a circle is called a:

A. Radius

B. Diameter

C. Sector

D. Segment

Question 10. If the radius of a circle is doubled, what happens to its diameter?

A. It becomes half.

B. It remains unchanged.

C. It doubles.

D. It becomes four times as large.

Question 11. Which of the following is the correct formula for the area of a circle?

A. 2πr

B. πr²

C. πd

D. 2r²

Question 12. A circle has a radius of 5 cm. What is its circumference?

A. 5π cm

B. 10π cm

C. 25π cm

D. 50π cm

Question 13. What is the longest chord of a circle?

A. Radius

B. Diameter

C. Minor arc

D. Sector

Question 14. If the radius of a circle is 4 cm, what is its area?

A. 8π cm²

B. 12π cm²

C. 16π cm²

D. 20π cm²

Question 15. If the radius of a circle is tripled, how does its area change?

A. It becomes three times as large.

B. It becomes six times as large.

C. It becomes nine times as large.

D. It remains unchanged.

Answer Key – Class 9 Maths Chapter 5 MCQs

1. Question 1 — Correct Answer: B. Radius The radius is the line segment joining the centre of a circle to any point on its circumference.
2. Question 2 — Correct Answer: C. 14 cm Diameter = 2 × radius = 2 × 7 = 14 cm.
3. Question 3 — Correct Answer: C. Diameter A diameter is a chord that passes through the centre of a circle.
4. Question 4 — Correct Answer: B. 10 cm Radius = Diameter ÷ 2 = 20 ÷ 2 = 10 cm.
5. Question 5 — Correct Answer: B. 2πr The circumference of a circle is given by C = 2πr, where r is the radius.
6. Question 6 — Correct Answer: B. 9π cm² Area = πr² = π × 3² = 9π cm².
7. Question 7 — Correct Answer: C. 44 cm Circumference = πd = (22/7) × 14 = 44 cm.
8. Question 8 — Correct Answer: B. Two Diameter = 2 × radius.
9. Question 9 — Correct Answer: B. Diameter A diameter is a chord that passes through the centre of a circle.
10. Question 10 — Correct Answer: C. It doubles. Diameter = 2 × radius. Doubling the radius doubles the diameter.
11. Question 11 — Correct Answer: B. πr² The area of a circle is calculated using A = πr².
12. Question 12 — Correct Answer: B. 10π cm Circumference = 2πr = 2 × π × 5 = 10π cm.
13. Question 13 — Correct Answer: B. Diameter The diameter is the longest chord because it passes through the centre of the circle.
14. Question 14 — Correct Answer: C. 16π cm² Area = πr² = π × 4² = 16π cm².
15. Question 15 — Correct Answer: C. It becomes nine times as large. Area = πr². If the radius becomes 3r, the new area is π(3r)² = 9πr², which is nine times the original area.

Want More Practice?

Strengthen your Class 9 Maths preparation with our Class 9 Maths Chapter 5 Worksheet — 50 MCQs from Science World By Tushar Sir.

Class 9 Maths · Chapter 5

• Practise additional multiple-choice questions.
• Revise important concepts and formulas.
• Check your answers using the answer key.
• Download the worksheet PDF for convenient practice.