Question 1 of 50
Which figure comes next in the pattern?
🔬 Science · Class 5 · 2026-27
SOF ISO Class 5 free mock test and sample paper
A full ISO Class 5 practice paper: 50 questions for 60 marks in 60 minutes, in the same 3 sections and order as the SOF paper. Take it here with an instant score — no login, no sign-up — or print it with an OMR sheet and the answer key. Free, with no ads.
- Questions50
- Marks60
- Time60 min
- Sections3
The paper
Tap an answer for each question. The 60-minute clock starts at your first answer; press Finish and mark at the bottom when you are done, and every answer is explained.
Section 1 — Logical Reasoning · 10 × 1 mark
- Question 2 of 50
In a certain code language, STAR is written as UVCT. How will LAMP be written in the same code?
- Question 3 of 50
Reyansh is facing West. Reyansh turns left, then left, then right. Which direction is Reyansh facing now?
- Question 4 of 50
In a class of 40 students, Aarav is 19th from the top. What is Aarav's position from the bottom?
- Question 5 of 50
Which number is the odd one out?
- Question 6 of 50
Today is Friday. Which day of the week will it be 87 days from today?
- Question 7 of 50
In a certain code language, WINTER is written as IWNTRE. How is SILVER written in that code?
- Question 8 of 50
If these words are arranged as in a dictionary, which word comes second?
GRAIN GRAPE GRAND GRAVE
- Question 9 of 50
Arjun has 2 shirts and 3 pairs of trousers. In how many different ways can Arjun dress?
- Question 10 of 50
Which option is the water image of the given figure?
Section 2 — Science · 35 × 1 mark
- Question 11 of 50
Which kind of pollution is mainly caused by drilling machines at a building site?
- Question 12 of 50
Which of these is a renewable resource?
- Question 13 of 50
Factory waste poured into rivers causes which kind of pollution?
- Question 14 of 50
Which national park is best known for the hangul (Kashmir stag)?
- Question 15 of 50
Which kind of joint is found at the skull?
- Question 16 of 50
Which of these diseases spreads through mosquito bites?
- Question 17 of 50
Which method would you use to separate common salt and water?
- Question 18 of 50
Which of these is a wheel and axle?
- Question 19 of 50
Which of these will a magnet attract?
- Question 20 of 50
Which of these increases friction?
- Question 21 of 50
Where does a shark live?
- Question 22 of 50
Camphor kept in an open dish slowly disappears. Which process is this?
- Question 23 of 50
A bat is ______.
- Question 24 of 50
How does typhoid spread from one person to another?
- Question 25 of 50
Which of these waste materials will rot away in the soil?
- Question 26 of 50
In burning coal, chemical energy changes into ______.
- Question 27 of 50
In the life cycle of a butterfly, which stage comes just before the pupa?
- Question 28 of 50
The stomach is part of which system?
- Question 29 of 50
Which of these is a solid?
- Question 30 of 50
Jim Corbett National Park is in which state or union territory?
- Question 31 of 50
Fill in the blank.
About ___ of the Earth's surface is covered with water.
- Question 32 of 50
A milk is ______.
- Question 33 of 50
What does the skull do?
- Question 34 of 50
Which of these is a shrub plant?
- Question 35 of 50
During a natural calamity, water covers fields, roads and homes for days. Which calamity is this?
- Question 36 of 50
Follow the path of the food. Which part comes next?
- Question 37 of 50
A lack of which of these causes goitre?
- Question 38 of 50
Which part of the tulsi plant do we eat?
- Question 39 of 50
Which of these is a change that can be reversed?
- Question 40 of 50
Which of these is the same kind of simple machine as a children's slide?
- Question 41 of 50
Which planet is the red planet, named for the colour of its dust?
- Question 42 of 50
Which of these dissolves in water?
- Question 43 of 50
You lift your school bag off the floor. Which force is at work here?
- Question 44 of 50
A bottle cap is an example of which simple machine?
- Question 45 of 50
Which of these will float on water?
Section 3 — Achievers Section · 5 × 3 marks
- Question 46 of 50
Which classical dance belongs to Odisha?
- Question 47 of 50
Find the missing number, if the same rule is followed in every row.
5 2 6 5 1 1 11 4 ?
- Question 48 of 50
Which statement is correct about a bat?
- Question 49 of 50
Read the given statements.
(i) Naphthalene balls change straight from a solid into a gas.
(ii) Melting of ice is a change that cannot be reversed.
(iii) Salt can be taken out of salt water by filtering it.
(iv) A magnet attracts a piece of wood.
Which of the statements are incorrect?
- Question 50 of 50
Which mixture can be separated using winnowing?
Answer key and explanations (opens below)
1. (B) 2. (D) 3. (B) 4. (D) 5. (C) 6. (B) 7. (C) 8. (C) 9. (A) 10. (A) 11. (A) 12. (B) 13. (D) 14. (B) 15. (A) 16. (B) 17. (D) 18. (B) 19. (A) 20. (D) 21. (A) 22. (C) 23. (A) 24. (D) 25. (D) 26. (C) 27. (A) 28. (A) 29. (B) 30. (B) 31. (D) 32. (A) 33. (C) 34. (D) 35. (D) 36. (C) 37. (D) 38. (A) 39. (B) 40. (D) 41. (D) 42. (D) 43. (C) 44. (C) 45. (A) 46. (C) 47. (C) 48. (B) 49. (A) 50. (C)
- 1. (B)
The pattern repeats every 2 figures, so the next one is a semicircle.
- 2. (D)
Every letter moves 2 places forward in the alphabet, so LAMP becomes NCOR.
- 3. (B)
A right turn moves one step clockwise (North → East → South → West) and a left turn one step back. West, then left, left, right, ends at South.
- 4. (D)
Position from the bottom = total − position from the top + 1 = 40 − 19 + 1 = 22.
- 5. (C)
97, 61, 53 are all prime numbers; 21 is not — it can be divided by 3.
- 6. (B)
87 days = 12 weeks and 3 days. Whole weeks bring us back to Friday, then 3 more: Monday.
- 7. (C)
The first pair and the last pair are turned round; the middle pair stays as it is. So SILVER becomes ISLVRE.
- 8. (C)
The words share their first 3 letters, so the order is decided by letter 4: GRAIN, GRAND, GRAPE, GRAVE. The second is GRAND.
- 9. (A)
Each of the 2 shirts can go with any of the 3 trousers: 2 × 3 = 6.
- 10. (A)
A water image is the reflection in the water below, so it flips top to bottom, not left to right.
- 11. (A)
Unwanted loud sound is noise pollution.
- 12. (B)
A renewable resource is replaced by nature as fast as we use it — sunlight, wind, water, forests.
- 13. (D)
That is water pollution: fish die and the water cannot be drunk.
- 14. (B)
Dachigam National Park, in Jammu and Kashmir, protects the hangul (Kashmir stag).
- 15. (A)
The skull has a fixed joint, which does not move at all.
- 16. (B)
Malaria spreads through mosquito bites. Rabies, Tuberculosis, Cholera spread in other ways.
- 17. (D)
Use evaporation, because the salt is dissolved, so the water must be boiled away.
- 18. (B)
A steering wheel works as a wheel and axle.
- 19. (A)
A magnet attracts things made of iron, steel, nickel or cobalt — not wood, plastic, glass or stone.
- 20. (D)
Spreading sand on a slippery road gives a better grip, so it increases friction. The others help things slide.
- 21. (A)
A shark lives in the sea.
- 22. (C)
Sublimation is a solid turning straight into a gas without becoming a liquid.
- 23. (A)
A bat is an omnivore — it eats both plants and animals.
- 24. (D)
Typhoid spreads through contaminated food and water.
- 25. (D)
Things that were once alive — peel, paper, cotton, leaves — are broken down by tiny living things in the soil.
- 26. (C)
In burning coal, chemical energy becomes heat energy.
- 27. (A)
A butterfly grows like this: egg → caterpillar (larva) → pupa → adult butterfly.
- 28. (A)
The stomach belongs to the digestive system, where it churns food and makes an acid that kills germs.
- 29. (B)
A solid keeps its own shape and its own size.
- 30. (B)
Jim Corbett National Park is in Uttarakhand.
- 31. (D)
Water covers about seven tenths of the Earth, which is why it is called the blue planet.
- 32. (A)
You cannot see through a milk, so it is opaque.
- 33. (C)
The skull protects the brain.
- 34. (D)
A rose is a shrub plant.
- 35. (D)
When water covers fields, roads and homes for days, it is a flood.
- 36. (C)
Food goes mouth → food pipe → stomach → small intestine → large intestine, so after the small intestine it reaches the large intestine.
- 37. (D)
goitre is caused by too little iodine, which we get from iodised salt.
- 38. (A)
We eat the leaf of the tulsi plant.
- 39. (B)
Melting of ice can be undone, getting back what we started with. The others make something new that cannot be turned back.
- 40. (D)
A children's slide and a ramp both work as inclined planes.
- 41. (D)
Mars is the red planet, named for the colour of its dust.
- 42. (D)
Common salt dissolves in water and seems to disappear; the others stay as bits you can see, or float on top.
- 43. (C)
Muscular force is at work: our muscles do the pushing or pulling.
- 44. (C)
A bottle cap works as a screw.
- 45. (A)
Things lighter than the water they push aside float; the upward push of the water is called the buoyant force.
- 46. (C)
Odissi is the classical dance of Odisha.
- 47. (C)
In each row, first × second − 4 = third, so 11 × 4 − 4 = 40.
- 48. (B)
A bat has wings of skin, and it feeds its young milk, which suits it to dark caves.
- 49. (A)
(i) is true; (ii) is false; (iii) is false; (iv) is false. So the incorrect ones are (ii), (iii) and (iv).
- 50. (C)
Winnowing works on rice grains and chaff because the light chaff is blown away by the wind.
About this mock test
- Is this ISO Class 5 mock test really free, with no login?
- Yes. The whole paper is on this page: no account, no sign-up, no phone number and no ads. Nothing your child answers here is sent anywhere or stored.
- How is it marked?
- The same way as the SOF paper: Logical Reasoning 1 mark a question, Science 1 mark a question, Achievers Section 3 marks a question, 60 marks in all. Press Finish and mark to see the score by section and the right answer, with an explanation, under every question.
- Can I print it?
- Yes. Print paper + OMR sheet lays it out like the real paper, with a bubble sheet and the answer key on its own last page so it can be set aside. Choose Save as PDF in the print dialog to keep a copy.
- Is it the same as the real ISO paper?
- It has the real paper's shape — 50 questions, the same sections in the same order, the same marks and the same 60 minutes — and its questions come from the ISO Class 5 syllabus. The questions are Sprinto's own, not SOF's; Sprinto is not affiliated with the Science Olympiad Foundation.
Fresh questions every time
This paper stays the same so it can be printed and shared. In the app every ISO Class 5 question is new, the next one is picked to be just hard enough, and mistakes come back until they stick. Still free.