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

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

1. ________ is the condition of the atmosphere at a particular place and time. (a) Climate (b) Weather (c) Season (d) Temperature
2. Which of the following is an example of a temporary change? (a) Burning wood (b) Rusting of iron (c) Melting ice (d) Cooking an egg
3. Which of these is not a primary colour? (a) Red (b) Green (c) Blue (d) Yellow
4. All of these are physical changes in plants except ________. (a) Leaf fall (b) Fruiting (c) Rusting (d) Flowering
5. Which instrument is NOT used to measure weather elements? (a) Thermometer (b) Rain gauge (c) Microscope (d) Wind vane
6. The process of a caterpillar changing into a butterfly is an example of ________ metamorphosis. (a) Incomplete (b) Partial (c) Complete (d) Simple
7. An example of an irreversible change is ________. (a) Melting of butter (b) Freezing water (c) Burning of paper (d) Dissolving salt
8. The main reason for observing road safety rules is ________. (a) To arrive late (b) To cause accidents (c) To protect lives (d) To waste time
9. The correct step in producing secondary colours is ________. (a) Mixing two primary colours (b) Mixing a primary and a secondary colour (c) Mixing two secondary colours (d) Mixing all primary colours
10. A rain gauge is used to measure the amount of ________. (a) Wind speed (b) Rainfall (c) Temperature (d) Air pressure
11. When iron objects are exposed to moisture and air, they undergo ________. (a) Melting (b) Burning (c) Rusting (d) Moulding
12. The life cycle of a cockroach involves three stages: egg, nymph, and adult. This is known as ________ metamorphosis. (a) Complete (b) Simple (c) Incomplete (d) Full
13. Which of the following factors affects weather? (a) Soil type (b) Sunshine (c) Ocean depth (d) Mountain height
14. When a plant grows from a seedling to a mature plant, it is an example of a change in ________. (a) Non-living things (b) Animals (c) Plants (d) Weather
15. The ability to live without harm or danger is called ________. (a) Risk (b) Safety (c) Adventure (d) Freedom
16. Which colour is formed when blue and yellow are mixed together? (a) Red (b) Orange (c) Green (d) Purple
17. All of these are stages in the complete metamorphosis of a butterfly except ________. (a) Egg (b) Larva (c) Nymph (d) Pupa
18. A change that cannot be easily reversed is called a ________ change. (a) Temporary (b) Reversible (c) Permanent (d) Physical
19. The instrument used to measure the direction of wind is the ________. (a) Thermometer (b) Barometer (c) Wind vane (d) Rain gauge
20. Interpreting a weather table helps us to understand past and present weather ________. (a) Events (b) Forecasts (c) Instruments (d) Symbols

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

1. (a) Define weather. (2 marks)
(b) List any three factors that affect weather. (3 marks)
(c) Explain the difference between a temporary and a permanent change, giving one example for each. (3 marks)
(d) State two advantages of observing road safety. (2 marks)

2. (a) What is a primary colour? (2 marks)
(b) Name the three primary colours. (3 marks)
(c) Describe the life cycle of an insect that undergoes complete metamorphosis. (3 marks)
(d) Give two examples of changes in non-living things. (2 marks)

3. (a) What is a wind vane used for? (2 marks)
(b) List two other weather instruments and state their uses. (3 marks)
(c) Explain what happens during the ‘fruiting’ stage of a plant’s physical change. (3 marks)
(d) Identify two items that should be handled carefully at home to ensure safety. (2 marks)

4. (a) Define safety in our environment. (2 marks)
(b) Describe two ways of keeping safe at school. (3 marks)
(c) Differentiate between complete and incomplete metamorphosis. (3 marks)
(d) Name two secondary colours. (2 marks)

Objective Marking Scheme
Question 1 – ✅ (b) Weather
Question 2 – ✅ (c) Melting ice
Question 3 – ✅ (b) Green
Question 4 – ✅ (c) Rusting
Question 5 – ✅ (c) Microscope
Question 6 – ✅ (c) Complete
Question 7 – ✅ (c) Burning of paper
Question 8 – ✅ (c) To protect lives
Question 9 – ✅ (a) Mixing two primary colours
Question 10 – ✅ (b) Rainfall
Question 11 – ✅ (c) Rusting
Question 12 – ✅ (c) Incomplete
Question 13 – ✅ (b) Sunshine
Question 14 – ✅ (c) Plants
Question 15 – ✅ (b) Safety
Question 16 – ✅ (c) Green
Question 17 – ✅ (c) Nymph
Question 18 – ✅ (c) Permanent
Question 19 – ✅ (c) Wind vane
Question 20 – ✅ (a) Events