SOF ISO (NSO) for Class 4

ISO Class 4 at a glance

Conducted by

Science Olympiad Foundation

Questions for Class 4

35

Duration

60 min

Total marks

40

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 4

35 questions for 40 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 4 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

   A heavy box is dragged up to the same shelf along three ramps of different lengths. Along which ramp is the smallest force needed?

   1. A.The same force along all three
   2. B.The longest ramp
   3. C.Whichever ramp is widest
   4. D.The middle ramp
   Show answer

   Answer: B. The longest ramp

   A longer ramp spreads the same climb over a greater distance, so each step of the journey lifts the box a little less and needs a smaller pull.

2. Question 2 · Science

   Select the odd one out on the basis of the covering on the body.

   1. A.Lizard
   2. B.Crocodile
   3. C.Pigeon
   4. D.Rohu fish
   Show answer

   Answer: C. Pigeon

   A pigeon's body is covered with feathers. Rohu fish, Lizard and Crocodile all agree on the basis named in the question, so the one that does not is the odd one out.

3. Question 3 · Science

   Three friends each said something. Aisha: A child has 20 milk teeth. Ananya: Molars are used to grind food. Anika: Canines are flat teeth used for grinding food. Who has made an INCORRECT statement?

   1. A.Aisha and Ananya only
   2. B.Anika only
   3. C.All three
   4. D.Aisha and Anika only
   Show answer

   Answer: B. Anika only

   Anika is wrong, because canines are pointed teeth used for tearing food. The others said something true, so the answer is Anika only.

4. Question 4 · Science

   Read these four statements about food. Which one is incorrect?

   1. A.Chapati comes from a plant.
   2. B.Paneer comes from an animal.
   3. C.Milk gives us mainly protein.
   4. D.Rice gives us mainly fat.
   Show answer

   Answer: D. Rice gives us mainly fat.

   Rice gives us mainly carbohydrate. It is often cooked with ghee or oil, but the grain itself is starch. Every other statement here is one you can check and find true, which is what leaves this one as the odd one out.

5. Question 5 · Science

   A magnet attracts iron, nickel and cobalt without touching them. Which of these can a magnet NOT be used for?

   1. A.Picking iron nails out of sand
   2. B.Picking up a copper coin from a table
   3. C.Turning a compass needle to the north
   4. D.Holding a note on a steel fridge door
   Show answer

   Answer: B. Picking up a copper coin from a table

   Copper is a metal, but only iron, nickel and cobalt answer a magnet, so a copper coin sits where it is.

6. Question 6 · Science

   A force acts between two surfaces that are touching and works against them sliding over each other. What is this force called?

   1. A.Gravity
   2. B.Friction
   3. C.Muscular force
   4. D.Elastic force
   Show answer

   Answer: B. Friction

   It is why a ball rolling on sand stops sooner than one on tiles, and why shoes grip a wet floor badly.

7. Question 7 · Logical Reasoning

   If doctor is called teacher, teacher is called farmer, farmer is called pilot and pilot is called doctor, then who grows our food?

   1. A.farmer
   2. B.pilot
   3. C.doctor
   4. D.teacher
   Show answer

   Answer: B. pilot

   Answer the question first, then translate. The true answer is farmer. But nothing here keeps its own name: farmer is called pilot, so pilot is what you say. Reading the swap the other way round - asking what is called farmer - answers a question nobody asked.

8. Question 8 · Logical Reasoning

   Each letter of the word ENVIRONMENT may be used only as often as it appears in it. Which of the following words CANNOT be formed from its letters?

   1. A.MENTOR
   2. B.INTERN
   3. C.INVENT
   4. D.MONITOR
   Show answer

   Answer: D. MONITOR

   Strike the letters of each option off ENVIRONMENT one at a time. The answer runs out at the letter O, which ENVIRONMENT does not supply often enough, while the other three can be built completely.

SOF ISO (NSO) Class 4 syllabus

As published by SOF for Class 4: 3 sections, 21 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 4

What is the SOF ISO (NSO) syllabus for Class 4?

The Class 4 paper has 3 sections: Logical Reasoning, Science, Achievers. Topics include Patterns, Alphabet Test, Coding-Decoding, Ranking Test, Mirror Images, Geometrical Shapes and Solids, Embedded Figures, Direction Sense Test, Possible Combinations, Analogy and Classification. The full list of 21 topics, as SOF publishes it, is on this page.

How many questions are in the Class 4 ISO paper?

35 questions for 40 marks, in 60 minutes. Logical Reasoning: 5 questions of 1 mark each; Science: 25 questions of 1 mark each; Achievers Section: 5 questions of 2 marks each. There is no negative marking.

When is the SOF ISO (NSO) exam for Class 4 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 4?

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 students, 50% marks).

Where can a Class 4 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.