WASSCE 2021 Integrated Science Past Questions and Answers
The WASSCE 2021 Integrated Science paper has 48 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. Natural fats are composed of
- A. carbon, hydrogen and oxygen.
- B. carbon, hydrogen and nitrogen.
- C. carbon, oxygen and nitrogen.
- D. hydrogen, oxygen and nitrogen,
Answer: A. carbon, hydrogen and oxygen.
Fats consist of the monomers or smaller molecules, glycerol and fatty acid. These molecules are composed of the chemical elements hydrogen, carbon, and oxygen.
Fats consist of the monomers or smaller molecules, glycerol and fatty acid. These molecules are composed of the chemical elements hydrogen, carbon, and oxygen.
2. Ash from burnt plant material can be used to prepare local soap because it contains
- A. potassium chloride.
- B. potassium hydroxide.
- C. hydrogen sulphide.
- D. ammonia.
Answer: B. potassium hydroxide.
Answer: B. Wood ash contains potassium compounds; dissolved in water it gives potassium hydroxide (potash), the alkali used to make local soap.
Answer: B. Wood ash contains potassium compounds; dissolved in water it gives potassium hydroxide (potash), the alkali used to make local soap.
3. Excessive amount of nitrogen in the soil leads to
- A. proper growth of plants.
- B. increased photosynthesis in plants.
- C. delayed maturity of crops.
- D. well-developed stems of crops.
Answer: C. delayed maturity of crops.
Answer: C. Too much nitrogen makes plants produce many leaves and delays flowering and maturity.
Answer: C. Too much nitrogen makes plants produce many leaves and delays flowering and maturity.
4. The SI unit of electric charge is
- A. ampere.
- B. coulomb.
- C. ohm.
- D. volt.
Answer: B. coulomb.
Answer: B. The SI unit of electric charge is the coulomb (C).
Answer: B. The SI unit of electric charge is the coulomb (C).
5. Which of the following gases is a greenhouse gas?
- A. Nitrous oxide
- B. Ozone
- C. Sulphur dioxide
- D. Carbon dioxide
Answer: D. Carbon dioxide
Answer: D. Carbon dioxide is the main greenhouse gas: it traps heat in the atmosphere.
Answer: D. Carbon dioxide is the main greenhouse gas: it traps heat in the atmosphere.
6. The instrument most suitable for the measurement of the thickness of a sheet of paper is
- A. Vernier callipers.
- B. micrometer screw gauge.
- C. metre rule.
- D. engineers callipers.
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7. Which of the following indicators can measure pH values?
- A. Litmus
- B. Methyl orange
- C. Phenolphthalein
- D. Universal indicator
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8. The main function of the rumen is to
- A. act as a chamber of digestion.
- B. absorb excess water.
- C. produce digestive juices.
- D. serve as storage chamber.
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9. The fibrous mesocarp of coconut aids its dispersal by
- A. explosion.
- B. insects.
- C. water.
- D. wildlife.
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10. Which of the following radiations are particles?
I. Alpha
II. Beta
III. Gamma
I. Alpha
II. Beta
III. Gamma
- A. I and II only
- B. I and III only
- C. II and III only
- D. I, II and III
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