BECE 2023 Integrated Science Past Questions and Answers

Paper 1: Objectives

1. The very hard greenish-black deposit around the corners of the teeth is known as
   1. A. gum disease
   2. B. plaque
   3. C. canes
   4. D. cavity
   Answer: B
2. When equal amount of water is poured on dry soil samples, the increase in weight per unit amount of soil would be highest in
   1. A. gravel
   2. B. clayey soil
   3. C. sandy soil
   4. D. loamy soil
   Answer: B
3. The following practices are cultural practices in crop production except
   1. A. nursing
   2. B. pest control
   3. C. mulching
   4. D. weeding
   Answer: A
4. An example of a mixture is
   1. A. sodium sulphate
   2. B. hydrogen chloride
   3. C. ammonia
   4. D. salt solution
   Answer: D
5. Which of the following statements about acids are correct?
   
   I. They turn red litmus paper blue.
   
   II. They can be neutralized by bases. III. Citrus fruits contain acids.
   1. A. I and II only
   2. B. II and III only
   3. C. I and III only
   4. D. I, II and III
   Answer: B
6. The practice of reducing the number of seedlings per stand for better growth is known as
   1. A. earthing up
   2. B. filling in
   3. C. pricking out
   4. D. thinning out
   Answer: D
7. A herbal mixture has a volume of 200 m³ and a mass of 10,000 kg. Determine the density of the mixture.
   1. A. 50 kg m⁻³
   2. B. 200 kg m⁻³
   3. C. 800 kg m⁻³
   4. D. 10,200 kg m⁻³
   Answer: A
8. How many atoms are present in H₂O₂?
   1. A. 5
   2. B. 4
   3. C. 3
   4. D. 2
   Answer: B
9. Which of the following electronic components is not made of semi-conductors?
   1. A. Capacitor
   2. B. Diode
   3. C. LED
   4. D. Transistor
   Answer: A
10. Steam changes to liquid by a process called
    1. A. evaporation
    2. B. condensation
    3. C. melting
    4. D. boiling
    Answer: B

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11. Which of the following body shapes facilitates movement in a fluid?
    1. A. Rectangular
    2. B. Spherical
    3. C. Streamline
    4. D. Triangular
12. Stirring of soil on vegetable beds is to
    
    I. improve aeration of soil.
    
    II. increase activities of soil organisms. III. increase water penetration in the soil. IV. reduce weed growth.
    1. A. I and II only
    2. B. I, III and IV only
    3. C. II, III and IV only
    4. D. I, II and IV only
13. The base of the N-P-N transistor normally
    1. A. is a p-type semiconductor
    2. B. is an n-type semiconductor
    3. C. is undoped semiconductor
    4. D. has electrons as majority charge carriers
14. One benefit of technology to industrialization is
    1. A. increase in cost of production
    2. B. reduction in skillful labor
    3. C. provision of machinery
    4. D. environmental pollution
15. Contour ploughing is normally practiced on
    1. A. hard-rocky lands
    2. B. muddy lands
    3. C. non-fertile lands
    4. D. sloppy lands
16. A pupil of mass 70 kg climbed a building of height 15 m. Determine the pupil's potential energy at the top of the building. [g=10m/s²]
    1. A. 10,500 J
    2. B. 5,250 J
    3. C. 1,050 J
    4. D. 700 J
17. Which of the following pairs of structures are present in animal cells?
    1. A. Mitochondrion and Chloroplast
    2. B. Nucleus and Chloroplast
    3. C. Vacuole and Nucleus
    4. D. Cell Wall and Mitochondrion
18. Artificial satellites can be used for
    
    I. communication.
    
    II. oil and gas exploration. III. meteorological studies.
    1. A. I only
    2. B. II only
    3. C. I and II only
    4. D. I, II and III
19. The image formed by a plane mirror is always
    1. A. real
    2. B. magnified
    3. C. inverted
    4. D. virtual
20. The following practices are principles in crop production except
    1. A. land selection
    2. B. pests and diseases control
    3. C. seed planting
    4. D. harvesting and processing
21. Which of the following pairs of elements is in the same period in the periodic table?
    1. A. 5B and 13Al
    2. B. H and 3Li
    3. C. 4Be and 5B
    4. D. Na and K
22. The daily variation of atmospheric conditions is called
    1. A. climate
    2. B. weather
    3. C. season
    4. D. humidity
23. To test for starch in a green leaf, it is usually boiled to
    1. A. isolate the starch
    2. B. kill the leaf
    3. C. make the leaf soft
    4. D. extract the chlorophyll
24. The following effects are as a result of soil erosion except
    1. A. increase in bushfires
    2. B. weakening support of plants
    3. C. loss of important minerals to plants
    4. D. weakening of support of buildings
25. The following products, X, Y, Z and W have masses 0.05 kg, 50 mg, 500 g and 0.05 g respectively.
    
    If all the products have equal volumes, which of the products (X, Y, Z, W) would have the highest density?
    1. A. X
    2. B. Y
    3. C. Z
    4. D. W and X
26. The following products, X, Y, Z and W have masses 0.05 kg, 50 mg, 500 g and 0.05 g respectively.
    
    Which of the products have the same mass?
    1. A. Y and W
    2. B. X and Y
    3. C. Y and Z
    4. D. X and W
27. Which of the following ions is formed by the loss of 2 electrons?
    1. A. Ca²⁺
    2. B. S²⁻
    3. C. K⁺
    4. D. F⁻
28. The farming system that makes the most effective use of land is
    1. A. crop rotation
    2. B. land rotation
    3. C. mixed cropping
    4. D. mixed farming
29. An example of a natural source of light is
    1. A. lantern
    2. B. moon
    3. C. glow worm
    4. D. torchlight
30. The SI unit that is derived is
    1. A. kg
    2. B. k
    3. C. Pa
    4. D. s
31. The grouping together of many stars is known as
    1. A. comet
    2. B. astronomy
    3. C. solar-system
    4. D. galaxy
32. The current in a resistor is 3A. If the resistance of the resistor is 4 ohms, determine the potential difference across the resistor.
    1. A. 0.75 V
    2. B. 1.33 V
    3. C. 7.00 V
    4. D. 12.00 V
33. Anemometer is an instrument for measuring
    1. A. relative humidity
    2. B. rainfall amount
    3. C. wind direction
    4. D. wind speed
34. Which of the following statements distinguishes arteries from veins?
    1. A. Arteries have relatively narrow lumen while veins have relatively wide lumen
    2. B. Arteries transport blood to the heart while veins carry blood away from the heart
    3. C. Arteries carry deoxygenated blood while veins carry oxygenated blood
    4. D. Arteries have valves while veins do not have valves
35. The element used in the manufacturing of electronic components is
    1. A. sodium
    2. B. fluorine
    3. C. silicon
    4. D. neon
36. Which of the following factors has the greatest influence on vegetable crop production?
    1. A. Availability of labour
    2. B. Neamess to market
    3. C. Source of water
    4. D. Presence of pest
37. The brightest of all the planets is
    1. A. Mars
    2. B. Saturn
    3. C. Uranus
    4. D. Venus
38. The use of separating funnel is most appropriate for separating which of the following mixtures?
    1. A. Sulphur and water
    2. B. Water and sodium chloride
    3. C. Vegetable oil and kerosene
    4. D. Water and vegetable oil
39. When a ray of light travels from a dense medium into a denser medium, it
    1. A. bends towards the normal
    2. B. bends away from the normal
    3. C. is parallel to the incident ray
    4. D. is perpendicular to the incident ray
40. The two main particles in the nucleus of an atom are
    1. A. neutrons and protons
    2. B. neutrons and electrons
    3. C. shells and neutrons
    4. D. electrons and protons

Paper 2: Theory

1. (a) The diagrams below are illustrations of the male and female reproductive systems for humans. Study them carefully and answer the questions that follow.
   
   
   
   (i) Name each of the parts labelled I, II, V, VI, VII, and VIII.
   
   (ii) State the function of each of the parts labelled III, IV, and VII.
   
   (iii) Name the labelled part where each of the following processes take place:
   
   a) Fertilization;
   
   b) Production of sperm;
   
   c) Ovulation.
   
   (iv) Name two common infectious diseases that affect both the male and female reproductive system.
   
   (b) The diagrams below are illustrations of different devices used on the farm. Study them carefully and answer the questions that follow.
   
   
   
   (i) Give a common name for the devices illustrated.
   
   (ii) Name each of the devices labelled A, B, and C.
   
   (iii) State one use of each of the devices named in (ii).
   
   (iv) State two effects of the use of the device C on the soil.
   
   (v) State two ways of prolonging the usefulness of the device labelled A.
   
   (c) (i) Draw the symbols for each of the following electronic components:
   
   a) Resistor;
   
   b) (p-n junction) diode;
   
   c) Cell;
   
   d) Light Emitting Diode/LED.
   
   (ii) Use the symbols drawn in (i) together with a switch to draw a circuit diagram to demonstrate forward biasing of a (p-n junction) diode and the light-emitting diode.
   
   (iii) State the effect of the resistor on the (p-n junction) diode and the light-emitting diode when the circuit is closed.
   
   (d) The following activities were carried out in the laboratory. Study them carefully and answer the questions that follow.
   
   I. 10 g of iodated salt was added to 150 ml of water in a beaker. The mixture was stirred thoroughly.
   
   II. Vegetable oil was added to a quantity of water in a corked flask and shaken vigorously, then allowed to stand for some time.
   
   III. A few grams of ground charcoal was added to water in a beaker and stirred vigorously, then allowed to stand.
   
   (i) State what will be observed in each of the activities I, II, and III.
   
   (ii) Suggest an aim for the experiment.
   
   (iii) State one difference between what is observed in I and III.
   
   (iv) State a method of separation for the activity carried out in II.
2. (a) (i) What is the importance of a fuse in an electrical appliance?
   
   (ii) State two household appliances that have a fuse.
   
   (b) (i) What is teenage pregnancy?
   
   (ii) State two causes of teenage pregnancy.
   
   (c) State three precautions against hazards.
   
   (d) (i) State two practices that destroy water bodies.
   
   (ii) Give two methods of conserving water bodies.
3. (a) (i) What is aerobic respiration?
   
   (ii) State the main difference between aerobic and anaerobic respiration.
   
   (b) (i) Explain the term potential difference.
   
   (ii) Calculate the current flowing through a 100Ω resistor with a potential difference of 250V.
   
   (c) (i) Which crop is infected by the Swollen Shoot disease?
   
   (ii) State the causative organism of the disease.
   
   (iii) State the method of spread of the disease.
   
   (iv) Give two ways of preventing the spread of the disease.
   
   (d) Elements X and Y:
   
   (i) Write the electronic configuration for Y.
   
   (ii) State the possible ion that could be formed by X to make it more stable.
4. (a) What is a neutralization reaction?
   
   (b) State three physical properties of soil.
   
   (c) (i) Define the term power.
   
   (ii) If a machine lifts a 50 kg case up a 10 m building in 30 seconds, calculate the power. [g = 10 m/s²]
   
   (d) State three areas where technology benefits humans.
5. (a) State three ways in which mulching restores soil resources.
   
   (b) (i) Name two elements that combine to form ammonia gas.
   
   (ii) Write a balanced chemical equation for ammonia formation.
   
   (c) Construct a food web using the organisms provided:
   
   1. Man feeds on grasscutter;
   
   2. Toad feeds on grasshopper;
   
   3. Snake feeds on toad;
   
   4. Goat feeds on grass;
   
   5. Man feeds on hawk;
   
   6. Grasshopper feeds on grass;
   
   7. Hawk feeds on snake;
   
   8. Grasscutter feeds on grass.
   
   (d) (i) What is a galaxy?
   
   (ii) State the relationship between stars and galaxies.
   
   (iii) Explain the term Milky Way.
6. (a) (i) State three effects of soil erosion on crop growth.
   
   (ii) Mention one method of controlling soil erosion.
   
   (b) (i) Name two science-related businesses.
   
   (ii) State the principles underlying each business.
   
   (c) (i) Explain how the female Anopheles mosquito transmits malaria.
   
   (ii) State one chemical method of mosquito control.
   
   (d) (i) Name two fundamental units of measurement.
   
   (ii) State the physical quantity one of the units measures.

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