BECE 2003 Integrated Science Past Questions and Answers
The BECE 2003 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 method used to separate an insoluble solid from a liquid is
- A. crystallization.
- B. distillation.
- C. filtration.
- D. sublimation.
Answer: C. filtration.
FILTRATION
FILTRATION
2. The scent of a perfume sprayed at one corner of a room fills the entire room through
- A. conduction.
- B. diffusion.
- C. osmosis.
- D. radiation.
Answer: B. diffusion.
Diffusion is the net passive movement of molecules or particles from regions of higher to regions of lower concentration.
At the corner of the room where the perfume was sprayed, the concentration was higher and the molecules moved from that region to the region where the concentration was lower.
Diffusion is the net passive movement of molecules or particles from regions of higher to regions of lower concentration.
At the corner of the room where the perfume was sprayed, the concentration was higher and the molecules moved from that region to the region where the concentration was lower.
3. Which of the following processes is a physical change?
- A. Rusting of iron.
- B. Burning of wood.
- C. Formation of water from hydrogen and oxygen.
- D. Solidification of water into ice.
Answer: D. Solidification of water into ice.
For a physical change, no new substance is formed. All the options except the "solidification of water into ice" are chemical changes since new substances are formed. Rusting of iron form oxidized iron, burning of wood forms ashes, chemical reaction of hydrogen and oxygen forms water.
In chemical change too, the process is not reversible but a physical change is reversible. For the solidification of water into ice, the ice could be melt back to water.
For a physical change, no new substance is formed. All the options except the "solidification of water into ice" are chemical changes since new substances are formed. Rusting of iron form oxidized iron, burning of wood forms ashes, chemical reaction of hydrogen and oxygen forms water.
In chemical change too, the process is not reversible but a physical change is reversible. For the solidification of water into ice, the ice could be melt back to water.
4. Atoms of the same element have the same
I. number of electrons
II. number of protons
III. chemical properties
Which of the above statements are true?
I. number of electrons
II. number of protons
III. chemical properties
Which of the above statements are true?
- A. I and II only
- B. II and III only
- D. I, II and III
Answer: D. I, II and III
Answer: D. Atoms of the same element have the same number of protons and electrons, and the same chemical properties.
Answer: D. Atoms of the same element have the same number of protons and electrons, and the same chemical properties.
5. The unit of measurement of energy is
- A. joule.
- B. kelvin.
- C. newton.
- D. watt.
Answer: A. joule.
Answer: A. Energy is measured in joules.
Answer: A. Energy is measured in joules.
6. Which of the following energy transformations takes place at a hydroelectric power station?
- A. Potential energy → kinetic energy → electrical energy
- B. Potential energy → sound energy → electrical energy
- C. Kinetic energy → sound energy → electrical energy
- D. Electrical energy → light energy → heat energy
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7. A drawing of magnetic line of force provides information on the
- A. source of the field.
- B. type of magnet.
- C. strength of the field.
- D. length of the magnet.
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8. A bottle of water removed from a refrigerator soon becomes covered with droplets of water because the
- A. bottle is porous.
- B. bottle is full of water.
- C. water in the surrounding atmosphere is colder than the water in the bottle.
- D. water in the surrounding atmosphere is warmer than the water in the bottle
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9. The volume of a metal ball was determined by dropping it into a measuring cylinder containing 20 cm$^{3}$ of water and the water level rose to 35 cm$^{3}$. If the mass of the ball is 35 g, calculate its density.
- A. 1.0 g cm$^{-3}$
- B. 1.6 g cm$^{-3}$
- C. 1.8 g cm$^{-3}$
- D. 2.3 g cm$^{-3}$
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10. A boy stepped on a banana peel on the ground and fell because the
- A. boy was not wearing shoes.
- B. ground was too hard.
- C. banana peel reduced the friction on the ground.
- D. banana peel increasethe friction on the ground.
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