WASSCE 2024 Integrated Science Past Questions and Answers
The WASSCE 2024 Integrated Science paper has 43 objective and 6 theory questions. Here are sample objective questions with the correct answers and explanations. Sit the full paper with the real time limit on ePrep.
Sample questions with answers
1. The process by which liquid changes into vapour at a particular temperature is known as
- A. boiling.
- B. condensation.
- C. evaporation.
- D. melting.
Answer: A. boiling.
Differences between evaporation and boiling
| Evaporation | Boiling |
|---|---|
| Evaporation is the process of vapourization of a liquid at room temperature | Boiling is the process of evaporation of a liquid at the boiling point of the liquid |
| Evaporation takes place at any given temperature | Boiling takes place only at the boiling point of the liquid |
| Evaporation takes place mainly at the surface of the liquid | Boiling takes place throughout the entire liquid |
| When evaporation takes place, the temperature of the liquid body decreases | The temperature remains constant throughout the boiling process |
| Evaporation takes place as long as the air above the liquid remains unsaturated | Boiling takes place when the internal liquid pressure is equal to the external pressure |
Boiling occurs at a particular temperature but evaporation occurs at any temperature
Differences between evaporation and boiling
| Evaporation | Boiling |
|---|---|
| Evaporation is the process of vapourization of a liquid at room temperature | Boiling is the process of evaporation of a liquid at the boiling point of the liquid |
| Evaporation takes place at any given temperature | Boiling takes place only at the boiling point of the liquid |
| Evaporation takes place mainly at the surface of the liquid | Boiling takes place throughout the entire liquid |
| When evaporation takes place, the temperature of the liquid body decreases | The temperature remains constant throughout the boiling process |
| Evaporation takes place as long as the air above the liquid remains unsaturated | Boiling takes place when the internal liquid pressure is equal to the external pressure |
Boiling occurs at a particular temperature but evaporation occurs at any temperature
2. Which of the following organisms has neither a nucleus nor membrane bound organelles?
- A. Bacteria
- B. Mucor
- C. Paramecium
- D. Spirogyra
Answer: A. Bacteria
Answer: A. Bacteria are prokaryotes: they have no true nucleus and no membrane-bound organelles.
Answer: A. Bacteria are prokaryotes: they have no true nucleus and no membrane-bound organelles.
3. A dibber is used for
- A. dehusking.
- B. pruning.
- C. thinning.
- D. planting.
Answer: D. planting.
Answer: D. A dibber is a pointed stick used to make holes for planting seeds and seedlings.
Answer: D. A dibber is a pointed stick used to make holes for planting seeds and seedlings.
4. An electric bulb is rated 120 W and 240 V. Determine the current it draws from the mains.
- A. 0.5 A
- B. 0.6 A
- C. 1.0 A
- D. 2.0 A
Answer: A. 0.5 A
Electric Power
Power (P) = Current (I) x Voltage (V)
Power = 120 W
Voltage = 240 V
120 = I x 240
Divide both sides by 240
I = $\frac{120}{240}$ = 0.5 A
Electric Power
Power (P) = Current (I) x Voltage (V)
Power = 120 W
Voltage = 240 V
120 = I x 240
Divide both sides by 240
I = $\frac{120}{240}$ = 0.5 A
7. Cowpea plants are used in crop rotation system of farming so that
- A. grazing animals would not destroy the crops.
- B. nitrates would be added to the soil.
- C. soil erosion could be checked.
- D. weeds would be suppressed.
Answer: B. nitrates would be added to the soil.
Answer: B. Root nodule bacteria in cowpea fix atmospheric nitrogen, adding nitrates to the soil for the next crop.
Answer: B. Root nodule bacteria in cowpea fix atmospheric nitrogen, adding nitrates to the soil for the next crop.
8. The angle of reflection of a ray is 40°. Determine the angle between the surface of the mirror and the ray.
- A. 40°
- B. 50°
- C. 80°
- D. 180°
Answer and explanation: practise this paper on ePrep.
9. Fluid consists of
- A. solid and liquid only.
- B. liquid and gas only.
- C. gas and solid only.
- D. liquid, solid and gas.
Answer and explanation: practise this paper on ePrep.
10. Which of the following compounds is a neutral oxide?
- A. CO$_{2}$
- B. NO$_{2}$
- C. MgO
- D. CO
Answer and explanation: practise this paper on ePrep.
11. For grafting to be successful, the scion and the stock must be of the same
- A. size.
- B. length.
- C. diameter.
- D. texture.
Answer and explanation: practise this paper on ePrep.
12. A gas that gives a pop sound with a flame is
- A. ammonia.
- B. carbon (IV) oxide.
- C. hydrogen.
- D. nitrogen.
Answer and explanation: practise this paper on ePrep.
Answer all 49 questions of the WASSCE 2024 Integrated Science paper
Timed papers like the real exam, instant marking, worked explanations, topic tests and mock exams. Theory answers marked by real teachers. 3 weeks free.
Practise free on ePrep