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Primary 4 Science Semestral Assessment 2 (End of Year) Paper 3

Free P4 Science SA2 Paper 3, Ox Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.

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Primary 4 Science From Real Exams Generated by Ox Alpha Updated 2026-08-27

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Questions

TuitionGoWhere Practice Paper - Science Primary 4

TuitionGoWhere Exam Practice (AI)

Field	Details
Subject:	Science
Level:	Primary 4
Paper:	SA2 Practice Paper — Version 3 of 5
Duration:	60 minutes
Total Marks:	50

Name: ______________________ Class: ____________ Date: ______________ Score: ____________

Note on topic focus: The requested topic "Diversity" is a Primary 3 topic and falls outside the Primary 4 syllabus scope for this SA2 set. To stay syllabus-accurate, this Version 3 paper assesses the official Primary 4 topics: Matter, Plant System, Human Digestive System, Light and Heat.

Instructions

Answer ALL 20 questions.
Section A: Circle the number (1, 2, 3 or 4) of the correct option.
Sections B and C: Write your answers in the spaces provided.
The marks for each question are shown in brackets [ ].
Check your answers before handing in your paper.

Section A: Multiple Choice (Questions 1–10) — 20 marks

Each question carries 2 marks.

1. Which one of the following is matter?

(1) sunlight (2) a shadow (3) the air in a classroom (4) heat from a flame [2]

2. Mei Ling poured the same drink into three containers of different shapes. The drink took the shape of each container, but its volume stayed the same. The drink is in the __________ state.

(1) solid (2) liquid (3) gas (4) frozen [2]

3. Which part of a plant absorbs water and minerals from the soil?

(1) leaf (2) stem (3) root (4) flower [2]

4. In which organ of the digestive system is food first churned and mixed with digestive juices?

(1) mouth (2) gullet (3) stomach (4) large intestine [2]

5. Ali can see his storybook in a dark room only after he switches on the lamp. Why?

(1) The book gives out its own light. (2) Light from the lamp reflects off the book into Ali's eyes. (3) The lamp shines directly into Ali's eyes. (4) The book becomes a light source when the lamp is on. [2]

6. Sarah shone a torch at a card and saw its shadow on a wall. She then moved the torch closer to the card. What happened to the shadow?

(1) It became smaller. (2) It became bigger. (3) It disappeared. (4) It stayed the same size. [2]

7. Which one of the following is NOT a source of heat?

(1) the Sun (2

<stage3_exam_md>

TuitionGoWhere Practice Paper - Science Primary 4

TuitionGoWhere Exam Practice (AI)

Field	Details
Subject:	Science
Level:	Primary 4
Paper:	SA2 Practice Paper — Version 3 of 5
Duration:	60 minutes
Total Marks:	50

Name: ______________________ Class: ____________ Date: ______________ Score: ____________

Instructions

Answer ALL 20 questions.
Section A: Circle the number (1, 2, 3 or 4) of the correct option.
Sections B and C: Write your answers in the spaces provided.
The marks for each question are shown in brackets [ ].
Check your answers before handing in your paper.

Section A: Multiple Choice (Questions 1–10) — 20 marks

Each question carries 2 marks.

1. Which one of the following is matter?

(1) sunlight (2) a shadow (3) the air in a classroom (4) heat from a flame [2]

2. Mei Ling poured the same drink into three containers of different shapes. The drink took the shape of each container, but its volume stayed the same. The drink is in the __________ state.

(1) solid (2) liquid (3) gas (4) frozen [2]

3. Which part of a plant absorbs water and minerals from the soil?

(1) leaf (2) stem (3) root (4) flower [2]

4. In which organ of the digestive system is food first churned and mixed with digestive juices?

(1) mouth (2) gullet (3) stomach (4) large intestine [2]

5. Ali can see his storybook in a dark room only after he switches on the lamp. Why?

6. Sarah shone a torch at a card and saw its shadow on a wall. She then moved the torch closer to the card. What happened to the shadow?

(1) It became smaller. (2) It became bigger. (3) It disappeared. (4) It stayed the same size. [2]

7. Which one of the following is NOT a source of heat?

(1) the Sun (2) an ice cube (3) a burning candle (4) an electric iron [2]

8. Water in a freezer changes into ice at 0°C. This change of state is called __________.

(1) melting (2) boiling (3) freezing (4) evaporation [2]

9. In which organ does the body absorb digested food into the bloodstream?

(1) mouth (2) gullet (3) small intestine (4) large intestine [2]

10. Ravi stirred hot soup with a metal spoon and a plastic spoon. After a few minutes, the metal spoon handle felt hot but the plastic one did not. Why?

(1) Metal is a poor conductor of heat. (2) Plastic is a good conductor of heat. (3) Metal is a good conductor of heat. (4) The plastic spoon gave out heat to the soup. [2]

Section B: Short Answer (Questions 11–16) — 18 marks

11. Ben has a stone, a bottle of milk and a balloon filled with air. State whether each item is a solid, a liquid or a gas. [3]

Stone: ______________________ Milk: ______________________ Air: ______________________

12. Complete the table by writing the function of each plant part. [3]

Plant part	Function
Roots	______________________________________
Stem	______________________________________
Leaves	______________________________________

13. Arrange these organs in the correct order that food passes through them, starting from the mouth:

small intestine — stomach — gullet — large intestine

Mouth → ________ → ________ → ________ → Large intestine [3]

14. Aiman placed a wooden block between a torch and a screen. A dark shape appeared on the screen. (a) What is the dark shape called? [1] (b) Explain why it formed. [2]

15. Siti left an ice cream on a table under the hot Sun. After ten minutes, the ice cream had melted. (a) What happened to the state of the ice cream? [1] (b) Explain what caused this change. [2]

16. Give two properties of gases that make them different from solids. [2]

Section C: Open-Ended (Questions 17–20) — 12 marks

17. Mei put two identical plants in different places for one week: Plant A near a sunny window and Plant B inside a dark cupboard. She watered both plants daily. (a) State one difference she would observe between the two plants after one week. [1] (b) Explain why this difference occurred. [2]

18. Explain why it is important to chew food properly before swallowing. [3]

19. Dev conducted an experiment with a torch, a cardboard cut-out shaped like the letter "H", and a screen. He moved the torch further away from the cut-out and observed the shadow each time. (a) What happened to the size of the shadow as the torch moved further away? [1] (b) Explain your answer in (a). [2]

20. Cooking pots are made of metal, but their handles are usually made of wood or plastic. Explain why. [3]

— END OF PAPER —

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Answers

TuitionGoWhere Practice Paper - Science Primary 4 — Answer Key (Version 3)

Section A: Multiple Choice (Questions 1–10)

Q	Answer	Explanation
1	(3)	Air has mass and takes up space, so it is matter. Sunlight, shadows and heat are not matter.
2	(2)	Liquids take the shape of their container but have a fixed volume.
3	(3)	Roots absorb water and dissolved minerals from the soil.
4	(3)	The stomach churns food and mixes it with digestive juices.
5	(2)	We see objects when light from a source reflects off them into our eyes.
6	(2)	Moving the light source closer makes the shadow bigger.
7	(2)	An ice cube is cold; it is not a source of heat.
8	(3)	Liquid water changing to solid ice at 0°C is freezing.
9	(3)	Digested food is absorbed into the bloodstream in the small intestine.
10	(3)	Metal conducts heat well, so heat travels up the metal spoon quickly.

Section B: Short Answer (Questions 11–16)

11. Stone: solid. Milk: liquid. Air: gas. (1 mark each) [3]

12.

Roots: absorb water and minerals from the soil; anchor the plant. (1)
Stem: holds the plant upright; transports water, minerals and food between roots and leaves. (1)
Leaves: make food for the plant using sunlight (photosynthesis); exchange gases. (1) [3]

13. Mouth → gullet → stomach → small intestine → large intestine (1 mark per correct position) [3]

14. (a) A shadow. [1] (b) The wooden block is opaque, so it blocks the light from the torch. Light cannot pass through it, so the area behind it on the screen is dark. [2]

15. (a) It changed from a solid to a liquid (it melted). [1] (b) The ice cream gained heat from the hot surroundings/Sun, causing it to melt. [2]

16. Any two:

Gases have no fixed shape; they take the shape of their container.
Gases have no fixed volume; they spread out to fill the whole container.
Gases can be compressed easily. (Any 2 × 1 mark) [2]

Section C: Open-Ended (Questions 17–20)

17. (a) Plant A grew well/stayed healthy with green leaves; Plant B grew poorly/wilted/had yellowing leaves. [1] (b) Plants need sunlight to make food. Plant A received sunlight and could make food, but Plant B did not receive sunlight, so it could not make enough food to stay healthy. [2]

18. Chewing breaks food into smaller pieces (1), which increases the surface area so digestive juices can act on the food more easily (1). Smaller pieces are also easier and safer to swallow and quicker to digest (1). [3]

19. (a) The shadow became smaller. [1] (b) As the torch moves further from the cut-out, the light rays reaching the cut-out spread over a wider area, so less light is blocked and the shadow cast on the screen is smaller. [2]

20. Metal is a good conductor of heat, so it heats up quickly and cooks food evenly (1). Wood and plastic are poor conductors (insulators) of heat (1), so the handle stays cool and the user's hand will not be burned when holding the pot (1). [3]

Total: 50 marks