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Class 9–10 Maths quiz — 5 October 2026

Questions and answers from this day. Play today's quiz to build your streak.

Question 1 · AP sums

Find the sum of the first 20 terms of the AP that starts at 5 with common difference 5.

  1. A. 1045
  2. B. 1050 ✓
  3. C. 1070
  4. D. 1000

Answer: 1050. Sum = n/2 × (2a + (n − 1)d) = 20/2 × (10 + 95) = 1050.

Question 2 · Pythagoras theorem

A right-angled triangle has legs of 3 cm and 4 cm. How long is the hypotenuse?

  1. A. 6 cm
  2. B. 5 cm ✓
  3. C. 10 cm
  4. D. 1 cm

Answer: 5 cm. c² = 3² + 4² = 9 + 16 = 25, so c = 5 cm.

Question 3 · Mensuration

A cylinder has a radius of 7 cm and a height of 13 cm. What is its volume? (Use π = 22/7)

  1. A. 2156 cm³
  2. B. 2002 cm³ ✓
  3. C. 4004 cm³
  4. D. 572 cm³

Answer: 2002 cm³. Volume = π r² h = 22/7 × 7 × 7 × 13 = 2002 cm³.

Question 4 · Quadratic equations

What is the larger root of x² − 7x + 10 = 0?

  1. A. 10
  2. B. 2
  3. C. 5 ✓
  4. D. 3

Answer: 5. x² − 7x + 10 = (x − 5)(x − 2) = 0, so the roots are 5 and 2. The larger is 5.

Question 5 · Linear equations

If x + y = 16 and x − y = 4, what is x?

  1. A. 20
  2. B. 16
  3. C. 11
  4. D. 10 ✓

Answer: 10. Add the two equations: 2x = 16 + 4 = 20, so x = 10.

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