SOF IMO for Class 5

IMO Class 5 at a glance

Conducted by

Science Olympiad Foundation

Questions for Class 5

50

Duration

60 min

Total marks

60

Fee

₹150-200

Exam window

Oct-Dec (L1); Feb (L2)

Levels

2 (Level 2 for Class 3-12)

Classes eligible

1-12

Level 1 is held in Oct-Dec and Level 2 in Feb. Each school picks its exam day inside the window; the date for your child comes from the school. Confirm on sofworld.org.

Exam pattern for Class 5

50 questions for 60 marks, 60 minutes, all multiple choice. No negative marking.

Ties are broken by section, in this order: Achievers > Everyday Maths > Mathematical Reasoning > Reasoning (M4,M2,M3,M1).

Try 8 real Class 5 questions

Straight from the PrepMojo question bank, written to the pattern of the SOF papers. Have a go, then open the answer.

1. Question 1 · Maths

   Which of these numbers is built from the fewest DIFFERENT prime factors?

   1. A.1331
   2. B.1944
   3. C.294
   4. D.1638
   Show answer

   Answer: A. 1331

   Break each number down into primes: 1944 = 2 x 2 x 2 x 3 x 3 x 3 x 3 x 3 (2 different); 1638 = 2 x 3 x 3 x 7 x 13 (4 different); 294 = 2 x 3 x 7 x 7 (3 different); 1331 = 11 x 11 x 11 (1 different). So the answer is 1331. Count how many DIFFERENT primes appear, not how many factors there are altogether - a number can be built from a single prime used eight times over.

2. Question 2 · Maths

   Which of these Roman numerals is written correctly?

   1. A.DCCCCXXXXVIIII
   2. B.VVVV
   3. C.CDXCIX
   4. D.IXXLCM
   Show answer

   Answer: C. CDXCIX

   CDXCIX is the only one that keeps every rule. It reads 400 + 90 + 9 = 499. The rules are: I, X, C and M may be repeated at most three times; V, L and D are never repeated and never taken away; I may only be taken from V and X, X only from L and C, and C only from D and M; and the symbols run from the largest value to the smallest.

3. Question 3 · Maths

   What kind of angle measures 30°?

   1. A.obtuse
   2. B.right
   3. C.acute
   4. D.straight
   Show answer

   Answer: C. acute

   An angle of 30° is acute. Acute is less than 90°, a right angle is exactly 90°, obtuse is between 90° and 180°, and straight is exactly 180°.

4. Question 4 · Maths

   Meera walks once round a square field of side 40 m. Sara walks three times round a rectangular field 18 m long and 16 m wide. Who covers the longer distance, and by how much?

   1. A.Sara, by 364 m
   2. B.Meera, by 44 m
   3. C.Sara, by 44 m
   4. D.Meera, by 58 m
   Show answer

   Answer: C. Sara, by 44 m

   Measure both boundaries before counting any laps: 4 × 40 = 160 m right round the square, against 2 × (18 + 16) = 68 m right round the rectangle. Now count the walking: Meera does 1 of the first, so 1 × 160 = 160 m, while Sara does 3 of the second, so 3 × 68 = 204 m, and the gap between those two totals is 204 − 160 = 44 m.

5. Question 5 · Maths

   A shop takes 3/8 off the price of a school bag, and Rahul pays ₹375. What was the price before the sale?

   1. A.₹3000
   2. B.₹600
   3. C.₹200
   4. D.₹375
   Show answer

   Answer: B. ₹600

   With 3/8 taken off, what is paid is the other 5/8 of the old price. One 8th is ₹375 ÷ 5 = ₹75, so the old price was 8 of them: ₹600.

6. Question 6 · Maths

   The word SALUTE is written in capital letters. How many of its letters contain a pair of perpendicular lines?

   1. A.6
   2. B.3
   3. C.2
   4. D.4
   Show answer

   Answer: B. 3

   Perpendicular lines meet at a right angle. L, T, E are built from an upright stroke and a level one, so each has a pair; S, A, U have no upright stroke meeting a level one - what they have is curved or slanted instead. That is 3 of them. A slanted stroke crossing another is not enough: the angle between them has to be a right angle.

7. Question 7 · Logical Reasoning

   Which letter lies exactly midway between G and U in the English alphabet?

   1. A.M
   2. B.O
   3. C.N
   4. D.J
   Show answer

   Answer: C. N

   G and U are 14 letters apart, so the middle lies 7 letters after G: N.

8. Question 8 · Logical Reasoning

   Today is Saturday. What day of the week will it be after 11 days?

   1. A.Sunday
   2. B.Wednesday
   3. C.Tuesday
   4. D.Thursday
   Show answer

   Answer: B. Wednesday

   Every 7 days the week repeats: 1 full week lands on Saturday again, then 4 more days on - Wednesday. The count starts with tomorrow, never with today itself.

SOF IMO Class 5 syllabus

As published by SOF for Class 5: 4 sections, 29 topics. Reproduced as printed, so what you read here is what the paper is set from.

Compiled from sofolympiadtrainer.com. Always confirm against the official site before an exam.

Questions parents ask about IMO Class 5

What is the SOF IMO syllabus for Class 5?

The Class 5 paper has 4 sections: Logical Reasoning, Mathematical Reasoning, Everyday Mathematics, Achievers. Topics include Patterns, Analogy, Classification, Geometrical Shapes, Mirror and Water Images, Direction Sense Test, Ranking Test, Alphabet Test, Logical Sequence of Words, Puzzle Test. The full list of 29 topics, as SOF publishes it, is on this page.

How many questions are in the Class 5 IMO paper?

50 questions for 60 marks, in 60 minutes. Logical Reasoning: 15 questions of 1 mark each; Mathematical Reasoning: 20 questions of 1 mark each; Everyday Mathematics: 10 questions of 1 mark each; Achievers Section: 5 questions of 3 marks each. There is no negative marking.

When is the SOF IMO exam for Class 5 in 2026-27?

Level 1 is held in Oct-Dec and Level 2 in Feb. Each school picks its own exam day inside that window and tells its students, so the date for your child comes from the school. Confirm it on the official SOF site before the exam.

Who goes to IMO Level 2 from Class 5?

IMO has a second level for Class 3 and above. SOF's rule for who qualifies from Level 1: Top 5% class-wise; OR zone top 25; OR school topper (min 10, 50%).

Where can a Class 5 child practise IMO questions for free?

On PrepMojo. Every child gets 10 practice questions a day free, forever, with no card needed, and every answer comes with an explanation. It works in the app on iPhone and Android and in any web browser. Till 30 Nov 2026, every child has PrepMojo Plus at no cost as part of our Navratri and Diwali Offer.