BECE 2002 June A Integrated Science Past Questions and Answers
The BECE 2002 June A Integrated Science paper has 40 objective and 4 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 gas usually used in fire extinguishers is
- A. carbon dioxide.
- B. carbon monoxide.
- C. hydrogen.
- D. oxygen.
Answer: A. carbon dioxide.
Why carbon dioxide is used as fire extinguisher
Carbon dioxide (CO$_{2}$) is not a supporter of combustion (combustion is an exothermic process that involves the formation of heat and light ).
Fire is caused by the three elements i.e. fuel, oxygen, and heat. If one of the three elements is removed fire will stop.Carbon dioxide removes one element, i.e oxygen.
(CO$_{2}$), being heavier than oxygen, covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled.
Why carbon dioxide is used as fire extinguisher
Carbon dioxide (CO$_{2}$) is not a supporter of combustion (combustion is an exothermic process that involves the formation of heat and light ).
Fire is caused by the three elements i.e. fuel, oxygen, and heat. If one of the three elements is removed fire will stop.Carbon dioxide removes one element, i.e oxygen.
(CO$_{2}$), being heavier than oxygen, covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled.
2. The physical change(s) that take(s) place when a piece of ice is heated continuously for a long time can be represented by
- A. solid → vapour
- B. vapour → solid → liquid
- C. solid → liquid → vapour
- D. liquid → vapour
Answer: C. solid → liquid → vapour
Ice is in the solid state. When heated, it melts into the liquid state (water) and which (water) when further heated vapourizes.
Ice is in the solid state. When heated, it melts into the liquid state (water) and which (water) when further heated vapourizes.
3. The chemical formula H$_{2}$ represents
- A. two atoms of hydrogen.
- B. two neutrons of hydrogen.
- C. two ions of hydrogen.
- D. two molecules of hydrogen.
Answer: A. two atoms of hydrogen.
Answer: A. H₂ is one molecule containing two hydrogen atoms.
Answer: A. H₂ is one molecule containing two hydrogen atoms.
4. The dissolution of sugar in water is a physical change because the sugar
- A. cannot be seen in water.
- B. cannot be separated from the water.
- C. can be separated from the water.
- D. can be tested in the water.
Answer: C. can be separated from the water.
For a physical change, no new substance(s) are formed and the change is reversible. The sugar can be separated from the water by means of distillation and therefore reversible.
For a physical change, no new substance(s) are formed and the change is reversible. The sugar can be separated from the water by means of distillation and therefore reversible.
5. Which of the following statements is true at the boiling point of water?
- A. The mass of the water remains the same.
- B. The temperature increases.
- C. The temperature remains constant.
- D. the volume of the water increases.
Answer: C. The temperature remains constant.
Answer: C. At boiling point the temperature stays constant while water changes to steam.
Answer: C. At boiling point the temperature stays constant while water changes to steam.
6. When matter changes state from gas to liquid there is
- A. a decrease in mass.
- B. a decrease in volume.
- C. an increase in pressure.
- D. an increase in temperature.
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7. The energy possessed by a compressed spring is a
- A. chemical energy.
- B. kinetic energy.
- C. magnetic energy.
- D. potential energy.
Answer and explanation: practise this paper on ePrep.
8. A ball is dropped from a height to the ground. The energy possessed by the ball just before it strikes the ground is called
- A. heat energy.
- B. kinetic energy.
- C. potential energy.
- D. sound energy.
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9. Which of the following statements about a force are true?
I. It causes moving objects to stop
II. It causes stationary objects to move
III. It can change the direction of motion
IV. It can change the shape of an object
I. It causes moving objects to stop
II. It causes stationary objects to move
III. It can change the direction of motion
IV. It can change the shape of an object
- A. I and II only
- B. III and IV only
- C. I, II and III only
- D. I, II, III and IV
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10. A body of mass 50 kg falls through a height of 5 m. If the acceleration due to gravity is 10 ms$^{-2}$, calculate the loss in potential energy.
- A. 50 J
- B. 250 J
- C. 500 J
- D. 2500 J
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