SOF ISO (NSO) for Class 6

ISO Class 6 at a glance

Conducted by

Science Olympiad Foundation

Questions for Class 6

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 6

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

Ties are broken by section, in this order: Achievers > Science > Reasoning (M3,M2,M1).

Try 8 real Class 6 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 · Science

   Which one of these statements about solids, liquids and gases is NOT true?

   1. A.Water vapour in the air is a liquid.
   2. B.Perfume in its bottle before spraying is a liquid.
   3. C.Water in a glass is a liquid.
   4. D.Fruit juice is a liquid.
   Show answer

   Answer: A. Water vapour in the air is a liquid.

   Water vapour in the air is a gas. The white cloud you see above a kettle is tiny liquid droplets; the water vapour itself is a gas and is invisible. Every other statement here is one you can check and find true, which is what leaves this one as the odd one out. If you can see it, it is not water vapour - the vapour itself is an invisible gas.

2. Question 2 · Science

   The beam of a lighthouse sweeps right round 12 times in 24 seconds. How long does one sweep take?

   1. A.12 s
   2. B.1 s
   3. C.2 s
   4. D.24 s
   Show answer

   Answer: C. 2 s

   The 24 seconds cover 12 repeats of the same movement, so share the time out equally between them: 24 divided by 12 gives the time for one sweep of the beam.

3. Question 3 · Science

   I hold more water than any other soil. I feel sticky when I am wet and I crack open when I dry out. What am I?

   1. A.Clayey soil
   2. B.Loamy soil
   3. C.Sandy soil
   4. D.Rocky soil
   Show answer

   Answer: A. Clayey soil

   The smallest particles pack closest and leave the narrowest spaces, so water is held rather than drained, and the drying is what cracks it.

4. Question 4 · Science

   Which of these is an artificial satellite?

   1. A.A weather satellite built and launched by people
   2. B.The Moon
   3. C.The Pole Star
   4. D.Venus
   Show answer

   Answer: A. A weather satellite built and launched by people

   A satellite is anything circling a planet. The Moon does it naturally; a weather satellite was built and sent up by people, so it is artificial.

5. Question 5 · Science

   Work out how the first pair is related and complete the second in the same way. Brain : Nervous system :: Stomach : ___

   1. A.Respiratory system
   2. B.Circulatory system
   3. C.Excretory system
   4. D.Digestive system
   Show answer

   Answer: D. Digestive system

   The first pair holds an organ and the body system it works in, so Brain goes with Nervous system. Carrying that same relation across, Stomach must be paired with Digestive system.

6. Question 6 · Science

   Work out how the first pair is related and complete the second in the same way. Brain : Nervous system :: Kidneys : ___

   1. A.Excretory system
   2. B.Circulatory system
   3. C.Respiratory system
   4. D.Digestive system
   Show answer

   Answer: A. Excretory system

   The first pair holds an organ and the body system it works in, so Brain goes with Nervous system. Carrying that same relation across, Kidneys must be paired with Excretory system.

7. Question 7 · Logical Reasoning

   In a certain code, CHAIR is written as 39. In the same code, what number is HORSE written as?

   1. A.65
   2. B.75
   3. C.60
   4. D.70
   Show answer

   Answer: A. 65

   Test a rule against the example before using it. Adding each letter's place in the alphabet (A=1, B=2 ... Z=26) gives CHAIR = 39, which matches - so HORSE = 8 + 15 + 18 + 19 + 5 = 65.

8. Question 8 · Logical Reasoning

   Asha is taller than Bela. Esha is taller than Asha. Bela is taller than Chetan. Who is the tallest?

   1. A.Asha
   2. B.Esha
   3. C.Bela
   4. D.Chetan
   Show answer

   Answer: B. Esha

   Join the clues into one line before answering. Each clue shares a name with another, and together they give Esha > Asha > Bela > Chetan - so the tallest is Esha and the shortest is Chetan. No single clue answers the question; the line does.

SOF ISO (NSO) Class 6 syllabus

As published by SOF for Class 6: 3 sections, 13 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 ISO Class 6

What is the SOF ISO (NSO) syllabus for Class 6?

The Class 6 paper has 3 sections: Logical Reasoning, Science, Achievers. Topics include Verbal and Non-Verbal Reasoning, The Wonderful World of Science, Food and Its Components, Materials Around Us, A Journey through States of Water, Methods of Separation, The Living World and Its Diversity, Exploring Magnets, Measurement of Length and Motion, Temperature and Its Measurement. The full list of 13 topics, as SOF publishes it, is on this page.

How many questions are in the Class 6 ISO paper?

50 questions for 60 marks, in 60 minutes. Logical Reasoning: 10 questions of 1 mark each; Science: 35 questions of 1 mark each; Achievers Section: 5 questions of 3 marks each. There is no negative marking.

When is the SOF ISO (NSO) exam for Class 6 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 ISO Level 2 from Class 6?

ISO 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 6 child practise ISO 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.