Primary 6 PSLE Science Semestral Assessment 2 (End of Year) Paper 1

TuitionGoWhere P6 Science - SA2 2026 (Version 2)

School: TuitionGoWhere
Subject: Science
Level: Primary 6
Assessment: Semestral Assessment 2 (SA2)
Duration: 1 hour 45 minutes
Total Marks: 100 marks
Date: October 2026

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INSTRUCTIONS TO CANDIDATES

1. Write your name and class in the spaces provided.
2. This paper consists of TWO sections.
3. Answer ALL questions.
4. Write your answers in the spaces provided in this booklet.
5. You may use a calculator for calculations.
6. All working must be shown clearly.

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SECTION A: Multiple Choice Questions (56 marks)

1. The main requirement for photosynthesis is: (2 marks)

• A) Oxygen
• B) Light energy
• C) Carbon monoxide
• D) Soil nutrients

2. What type of energy does moving water have? (2 marks)

• A) Chemical energy
• B) Kinetic energy
• C) Sound energy
• D) Nuclear energy

3. Materials that allow light to pass through clearly are: (2 marks)

• A) Opaque
• B) Translucent
• C) Transparent
• D) Reflective

4. Sound is produced by: (2 marks)

• A) Light waves
• B) Heat energy
• C) Vibrating objects
• D) Electric current

5. What happens to gravitational force as objects get further apart? (2 marks)

• A) It increases
• B) It decreases
• C) It stays the same
• D) It becomes zero

6. In a food chain, energy flows from: (2 marks)

• A) Predator to prey
• B) Consumer to producer
• C) Producer to consumer
• D) Decomposer to consumer

7. Which gas do plants absorb during photosynthesis? (2 marks)

• A) Oxygen
• B) Nitrogen
• C) Carbon dioxide
• D) Hydrogen

8. Light travels in: (2 marks)

• A) Curved lines only
• B) Straight lines only
• C) All directions equally
• D) Circular patterns

9. The loudness of sound depends on: (2 marks)

• A) Frequency
• B) Wavelength
• C) Amplitude
• D) Speed

10. What force opposes motion? (2 marks)

• A) Gravitational force
• B) Magnetic force
• C) Friction force
• D) Spring force

11. Primary consumers in an ecosystem are: (2 marks)

• A) Plants
• B) Herbivores
• C) Carnivores
• D) Decomposers

12. Which energy source is renewable? (2 marks)

• A) Coal
• B) Natural gas
• C) Solar power
• D) Oil

13. When light hits a mirror, it is: (2 marks)

• A) Absorbed
• B) Refracted
• C) Reflected
• D) Transmitted

14. High-pitched sounds have: (2 marks)

• A) Low frequency
• B) High frequency
• C) Large amplitude
• D) No frequency

15. Elastic potential energy is stored in: (2 marks)

• A) Moving objects
• B) High places
• C) Hot objects
• D) Stretched or compressed objects

16. Photosynthesis mainly occurs in: (2 marks)

• A) Roots
• B) Stems
• C) Leaves
• D) Flowers

17. In a parallel electrical circuit: (2 marks)

• A) Current is the same in all branches
• B) Voltage is different in each branch
• C) Components work independently
• D) One broken component stops all others

18. Light bends when it moves from air to water. This is called: (2 marks)

• A) Reflection
• B) Refraction
• C) Absorption
• D) Transmission

19. Which animals use echolocation? (2 marks)

• A) Birds and fish
• B) Bats and dolphins
• C) Cats and dogs
• D) Snakes and lizards

20. Weight is a measure of: (2 marks)

• A) Amount of matter
• B) Gravitational force
• C) Volume
• D) Density

21. Decomposers are important because they: (2 marks)

• A) Eat plants
• B) Hunt animals
• C) Recycle nutrients
• D) Produce oxygen

22. A good electrical conductor is: (2 marks)

• A) Plastic
• B) Rubber
• C) Copper
• D) Wood

23. The image formed by a plane mirror is: (2 marks)

• A) Real and upright
• B) Virtual and upright
• C) Real and inverted
• D) Virtual and inverted

24. Sound cannot travel through: (2 marks)

• A) Air
• B) Water
• C) Metal
• D) Vacuum

25. Energy conservation means: (2 marks)

• A) Energy is always increasing
• B) Energy cannot be created or destroyed
• C) Energy only exists in batteries
• D) Energy disappears over time

26. Stomata in leaves help with: (2 marks)

• A) Water absorption
• B) Gas exchange
• C) Light capture
• D) Nutrient storage

27. The main advantage of LED bulbs is: (2 marks)

• A) They are cheaper to buy
• B) They use less energy
• C) They are brighter
• D) They last shorter time

28. Total internal reflection is used in: (2 marks)

• A) Mirrors
• B) Lenses
• C) Fiber optic cables
• D) Windows

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SECTION B: Open-Ended Questions (44 marks)

Question 1 (15 marks)

Sarah conducts a comprehensive experiment to study factors affecting photosynthesis. She uses aquatic plants and measures oxygen bubble production under different conditions.

Setup and Results:

Condition	Light Distance (cm)	Temperature (°C)	CO₂ Bubbles Added	O₂ Bubbles/min
A	20	25	Yes	15
B	40	25	Yes	8
C	20	15	Yes	6
D	20	25	No	3

(a) Identify THREE factors that affect photosynthesis shown in this experiment. (3 marks)

1. ---

2. ---

3. ---

(b) Which condition (A, B, C, or D) shows the highest rate of photosynthesis? Explain why. (3 marks)

Condition: _________________________________________________

Explanation: _________________________________________________

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(c) Compare conditions A and B. What can you conclude about the effect of light intensity? (2 marks)

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(d) Compare conditions A and C. What factor causes the difference in results? (2 marks)

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(e) Why does condition D still produce some oxygen bubbles? (2 marks)

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(f) Write the balanced equation for photosynthesis. (2 marks)

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(g) If Sarah wanted to increase the rate of photosynthesis in condition C, suggest ONE change she could make. (1 mark)

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Question 2 (15 marks)

The diagram shows energy transformations in different situations:

Situation 1: Wind turbine generating electricity
Situation 2: Car braking to a stop
Situation 3: Bow and arrow being shot
Situation 4: Solar panel powering a light bulb

(a) For each situation, describe the main energy transformations: (8 marks)

Situation 1: _______________________ energy → _______________________ energy

Situation 2: _______________________ energy → _______________________ energy

Situation 3: _______________________ energy → _______________________ energy

Situation 4: _______________________ energy → _______________________ energy

(b) Which situations demonstrate renewable energy use? Explain your choices. (3 marks)

Situations: _________________________________________________

Explanation: _________________________________________________

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(c) In Situation 3, calculate the kinetic energy of a 0.05 kg arrow moving at 20 m/s. Use KE = ½mv². (2 marks)

KE = ½ × _____________ × _____________²

KE = _____________

(d) Explain why energy efficiency is important for the environment. (2 marks)

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Question 3 (14 marks)

David investigates the behavior of light using mirrors and lenses:

Experiment 1: Light ray hitting a plane mirror at 30° to the normal
Experiment 2: Light ray passing from air into water
Experiment 3: White light passing through a triangular prism

(a) For Experiment 1, what is the angle of reflection? State the law that applies. (3 marks)

Angle of reflection: _________________________________________________

Law: _________________________________________________

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(b) In Experiment 2, what happens to the light ray? What is this phenomenon called? (3 marks)

What happens: _________________________________________________

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Name of phenomenon: _________________________________________________

(c) In Experiment 3, what do you observe when white light exits the prism? Explain why this happens. (4 marks)

Observation: _________________________________________________

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Explanation: _________________________________________________

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(d) Draw a ray diagram showing what happens when a light ray hits a convex lens. Label the focal point and show how parallel rays behave. (3 marks)

[Space for diagram]

(e) Give ONE practical application for each optical phenomenon: (1 mark)

Reflection: _________________________________________________

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END OF PAPER

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MARKING ALLOCATION

• Section A (MCQ): 56 marks
• Section B (Open-ended): 44 marks
• Total: 100 marks

TIME ALLOCATION GUIDANCE

• Section A: 45 minutes
• Section B: 55 minutes
• Checking: 5 minutes

TuitionGoWhere P6 Science - SA2 2026 (Version 2) ANSWER KEY

Assessment: Semestral Assessment 2 (SA2)
Total Marks: 100 marks

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SECTION A: Multiple Choice Questions - ANSWERS (56 marks)

1. (B) Light energy
2. (B) Kinetic energy
3. (C) Transparent
4. (C) Vibrating objects
5. (B) It decreases
6. (C) Producer to consumer
7. (C) Carbon dioxide
8. (B) Straight lines only
9. (C) Amplitude
10. (C) Friction force
11. (B) Herbivores
12. (C) Solar power
13. (C) Reflected
14. (B) High frequency
15. (D) Stretched or compressed objects
16. (C) Leaves
17. (C) Components work independently
18. (B) Refraction
19. (B) Bats and dolphins
20. (B) Gravitational force
21. (C) Recycle nutrients
22. (C) Copper
23. (B) Virtual and upright
24. (D) Vacuum
25. (B) Energy cannot be created or destroyed
26. (B) Gas exchange
27. (B) They use less energy
28. (C) Fiber optic cables

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SECTION B: Open-Ended Questions - ANSWERS (44 marks)

Question 1 (15 marks)

(a) Three factors affecting photosynthesis: (3 marks)

1. Light intensity/distance from light
2. Temperature
3. Carbon dioxide concentration

(b) Highest rate condition: (3 marks) Condition: A Explanation: Has optimal light (closest), warm temperature, and added CO₂ - all factors favor photosynthesis

(c) Light intensity effect: (2 marks) As light distance increases (A→B), photosynthesis rate decreases from 15 to 8 bubbles/min

(d) Factor causing A vs C difference: (2 marks) Temperature - lower temperature in C slows down photosynthesis reactions

(e) Why condition D produces oxygen: (2 marks) Plant uses stored energy and naturally dissolved CO₂ in water for minimal photosynthesis

(f) Balanced equation: (2 marks) 6CO₂ + 6H₂O + Light → C₆H₁₂O₆ + 6O₂

(g) Improvement for condition C: (1 mark) Increase temperature/move to warmer location

Question 2 (15 marks)

(a) Energy transformations: (8 marks) Situation 1: Kinetic energy → Electrical energy Situation 2: Kinetic energy → Heat energy
Situation 3: Elastic potential energy → Kinetic energy Situation 4: Light energy → Electrical energy

(b) Renewable energy situations: (3 marks) Situations: 1 and 4 Explanation: Wind and solar are renewable sources that won't run out, unlike fossil fuels

(c) Kinetic energy calculation: (2 marks) KE = ½ × 0.05 × 20² = ½ × 0.05 × 400 = 10 J

(d) Importance of energy efficiency: (2 marks) Reduces energy waste, decreases pollution, conserves natural resources for future generations

Question 3 (14 marks)

(a) Angle of reflection and law: (3 marks) Angle: 30° Law: Law of reflection - angle of incidence equals angle of reflection, measured from normal

(b) Light in water: (3 marks) What happens: Light ray bends toward the normal as it enters water Phenomenon: Refraction

(c) White light through prism: (4 marks) Observation: White light separates into rainbow colors (spectrum) Explanation: Different colors have different wavelengths and refract by different amounts

(d) Ray diagram: (3 marks) [Should show parallel rays converging at focal point through convex lens]

(e) Practical application: (1 mark) Reflection: Mirrors in cars/bathrooms

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MARKING GUIDELINES:

• Award marks for scientifically correct alternative wordings
• Accept spelling errors if meaning is clear