Examination on Basic Science
Class: Primary 4
Term: Third Term
Time: 1 Hour
Total Marks: 70

SECTION A: OBJECTIVES (40 Marks)
Instruction: Answer all questions.

1. ________ is the process where water changes into ice. (a) Evaporation (b) Freezing (c) Melting (d) Boiling
2. The chemical formula for water is ________. (a) CO2 (b) O2 (c) H2O (d) N2
3. Which of the following describes how dew forms? (a) Water boils on surfaces (b) Water vapour condenses on cool surfaces (c) Ice melts on leaves (d) Rain falls on plants
4. All of these are liquids that provide energy except ________. (a) Kerosene (b) Petrol (c) Diesel (d) Water
5. The main reason streams dry up in the dry season is due to ________. (a) Heavy rainfall (b) Freezing temperatures (c) High evaporation (d) Cloud formation
6. Water is made up of hydrogen and ________. (a) Nitrogen (b) Oxygen (c) Carbon (d) Sulphur
7. Which of these is NOT an element of the water cycle? (a) Stream (b) Cloud (c) Ocean (d) Mountain
8. An example of a graduated container used to measure liquid volume is a ________. (a) Plate (b) Spoon (c) Measuring cylinder (d) Stone
9. Liquids flow and take the shape of their ________. (a) Own form (b) Container (c) Solid (d) Air
10. What is the combining ratio of hydrogen to oxygen in water? (a) 1:1 (b) 1:2 (c) 2:1 (d) 2:2
11. Which of the following is a unit for measuring the volume of liquids? (a) Kilogram (b) Metre (c) Millilitre (d) Second
12. The process where water vapour turns into liquid droplets to form clouds is called ________. (a) Evaporation (b) Condensation (c) Precipitation (d) Sublimation
13. Which of these is not a physical property of liquids? (a) Definite volume (b) Indefinite shape (c) Fixed shape (d) Flows easily
14. The correct step in measuring the volume of an irregular solid involves the ________ method. (a) Direct measurement (b) Displacement (c) Weighing (d) Heating
15. One litre is equal to how many millilitres? (a) 100ml (b) 10ml (c) 1000ml (d) 10000ml
16. ________ is the ability to do work. (a) Force (b) Power (c) Energy (d) Motion
17. Which of these liquids is commonly used to fuel vehicles? (a) Water (b) Milk (c) Petrol (d) Oil (cooking)
18. When water freezes, its temperature drops below ________ degrees Celsius. (a) 100 (b) 50 (c) 0 (d) 10
19. Which of the following explains the drying up of streams during the dry season? (a) Heavy rain (b) High temperatures cause evaporation (c) Water freezes (d) Clouds cover the sun
20. A liquid has no definite shape but a definite ________. (a) Mass (b) Volume (c) Length (d) Area

SECTION B: THEORY (30 Marks)
Instruction: Answer any THREE questions.

1. (a) Define the water cycle. (2 marks)
(b) List any three elements of the water cycle. (3 marks)
(c) Explain why streams dry up during the dry season. (3 marks)
(d) What is freezing? (2 marks)

2. (a) Give two examples of liquids. (2 marks)
(b) List three physical properties of liquids. (3 marks)
(c) Define energy. (3 marks)
(d) Name two liquids that provide energy. (2 marks)

3. (a) Write the chemical formula for water. (2 marks)
(b) Name the two elements that make up water and state their combining ratio. (3 marks)
(c) Explain how dew forms on leaves or cool surfaces. (3 marks)
(d) What is dew? (2 marks)

4. (a) Define volume. (2 marks)
(b) List two metric units used for measuring the volume of liquids. (3 marks)
(c) Describe how the volume of an irregular solid can be measured using the displacement method. (3 marks)
(d) Convert 5000ml to litres. (2 marks)

Objective Marking Scheme

Question 1 – ✅ (b) Freezing
Question 2 – ✅ (c) H2O
Question 3 – ✅ (b) Water vapour condenses on cool surfaces
Question 4 – ✅ (d) Water
Question 5 – ✅ (c) High evaporation
Question 6 – ✅ (b) Oxygen
Question 7 – ✅ (d) Mountain
Question 8 – ✅ (c) Measuring cylinder
Question 9 – ✅ (b) Container
Question 10 – ✅ (c) 2:1
Question 11 – ✅ (c) Millilitre
Question 12 – ✅ (b) Condensation
Question 13 – ✅ (c) Fixed shape
Question 14 – ✅ (b) Displacement
Question 15 – ✅ (c) 1000ml
Question 16 – ✅ (c) Energy
Question 17 – ✅ (c) Petrol
Question 18 – ✅ (c) 0
Question 19 – ✅ (b) High temperatures cause evaporation
Question 20 – ✅ (b) Volume