Chapter Exam

Chapter-13 Geometry Circles — Online MCQ Test

Q: What is the fixed point from which all points on a circle are equidistant called?

Answer: B. Centre — The centre is the point from which every point on the circle is at the same distance. That common distance is the radius.

Q: Which of the following is a line segment joining the centre of a circle to any point on the circle?

Answer: C. Radius — A radius connects the centre of the circle to a point on the circle. It is one of the basic parts of a circle.

Q: If the radius of a circle is 7 cm, what is its diameter?

Answer: C. 14 cm — Diameter is twice the radius. So, 2 × 7 = 14 cm.

Q: In a circle, if a line is at a distance equal to the radius from the centre, what can be said about the line?

Answer: B. It must be a tangent — A line at a perpendicular distance equal to the radius from the centre touches the circle at exactly one point. Therefore, it is a tangent.

MATHS · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-13 Geometry Circles with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th MATHS. This chapter covers: circle radius tangent Explains properties of circles chords tangents and constructions. AI-generated questions from basic to board-exam level, with instant results and explanations.

Questions

20m

Time Limit

Attempts Left

10 random questions from this chapter (mixed difficulty)
Questions you've seen before won't repeat until the pool resets
You have 20 minutes — exam auto-submits when time is up
Maximum 3 attempts per chapter
Results and explanations shown immediately after submission

New here? Register free — includes 3 free chapter exams.

Chapter-13 Geometry Circles — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th MATHS — Chapter-13 Geometry Circles, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the fixed point from which all points on a circle are equidistant called?

A. Chord
B. Centre ✓
C. Radius
D. Diameter

Answer: B. Centre
The centre is the point from which every point on the circle is at the same distance. That common distance is the radius.

Which of the following is a line segment joining the centre of a circle to any point on the circle?

A. Chord
B. Secant
C. Radius ✓
D. Tangent

Answer: C. Radius
A radius connects the centre of the circle to a point on the circle. It is one of the basic parts of a circle.

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

A. 3.5 cm
B. 7 cm
C. 14 cm ✓
D. 21 cm

Answer: C. 14 cm
Diameter is twice the radius. So, 2 × 7 = 14 cm.

A student says, 'Every chord is a diameter.' Which is the best response?

A. Correct, because all chords pass through the centre.
B. Incorrect, because only chords passing through the centre are diameters. ✓
C. Correct, because diameter is another name for chord.
D. Incorrect, because no chord can touch the circle.

Answer: B. Incorrect, because only chords passing through the centre are diameters.
A diameter is a special chord that passes through the centre. Many chords do not pass through the centre.

In a circle, if a line is at a distance equal to the radius from the centre, what can be said about the line?

A. It must be a diameter
B. It must be a tangent ✓
C. It must be a chord passing through the centre
D. It must be a secant

Answer: B. It must be a tangent
A line at a perpendicular distance equal to the radius from the centre touches the circle at exactly one point. Therefore, it is a tangent.