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THE WEST AFRICAN EXAMINATIONS COUNCIL GHANA

Basic Education Certificate Examination

Integrated Science 2023

OBJECTIVE TEST

Objective Test

Question 1

The very hard greenish-black deposit around the corners of the teeth is known as

Question 2

When equal amounts of water are poured on dry soil samples, the increase in weight per unit amount of soil would be highest in

Question 3

The following practices are cultural practices in crop production except

Question 4

An example of a mixture is

Question 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.

Question 6

The practice of reducing the number of seedlings per stand for better growth is known as

Question 7

A herbal mixture has a volume of 200 m3 and a mass of 10,000 kg. Determine the density of the mixture.

Question 8

How many atoms are present in H2O2?

Question 9

Which of the following electronic components is not made of semiconductors?

Question 10

Steam changes to liquid by a process called

Question 11

Which of the following body shapes facilitates movement in a fluid?

Question 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.

Question 13

The base of the N-P-N transistor normally

Question 14

One benefit of technology to industrialization is

Question 15

Contour ploughing is normally practiced on

Question 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 = 10 m-2]

Question 17

Which of the following pairs of structures are present in animal cells?

Question 18

Artificial satellites can be used for I. communication. II. oil and gas exploration. III. meteorological studies.

Question 19

The image formed by a plane mirror is always

Question 20

The following practices are principles in crop production except

Question 21

Which of the following pairs of elements is in the same period in the periodic table?

Question 22

The daily variation of atmospheric conditions is called

Question 23

To test for starch in a green leaf, it is usually boiled to

Question 24

The following effects are as a result of soil erosion except

Question 25

The following products, X, Y, Z and W have masses 0.05 kg, 50 mg, 500 g and 0.05 g respectively. Use this information to answer the question below. If all the products have equal volumes, which of the product(s) would have the highest density?

Question 26

The following products, X, Y, Z and W have masses 0.05 kg, 50 mg, 500 g and 0.05 g respectively. Use this information to answer the question below. Which of the products have the same mass?

Question 27

Which of the following ions is formed by the loss of 2 electrons?

Question 28

The farming system that makes the most effective use of land is

Question 29

An example of a natural source of light is

Question 30

The SI unit that is derived is

Question 31

The grouping together of many stars is known as

Question 32

The current in a resistor is 3A. If the resistance of the resistor is 4 ohms, determine the potential difference across the resistor.

Question 33

Anemometer is an instrument for measuring.

Question 34

Which of the following statements distinguishes arteries from veins?

Question 35

The element used in the manufacturing of electronic components is

Question 36

Which of the following factors has the greatest influence on vegetable crop production?

Question 37

The brightest of all the planets is

Question 38

The use of separating funnel is most appropriate for separating which of the following mixtures?

Question 39

When a ray of light travels from a dense medium into a denser medium, it

Question 40

The two main particles in the nucleus of an atom are

THEORY

ESSAY

This paper is in two parts: I and II. Answer Question 1 in part I and any other four question in part II

Question 1

Theory question 1 diagram
  1. The diagrams below are illustrations of the male and female reproductive systems for humans. Study them carefully and answer the questions that follow. Name each of the parts labelled I, II, V, VI, VII, and VIII. State the function of each of the parts labelled III, IV, and VII. Name the labelled part where each of the following processes take place: α) Fertilization; β) Production of sperm; γ) Ovulation. Name two common infectious diseases that affect both the male and female reproductive system.
  2. The diagrams below are illustrations of different devices used in the farm. Study them carefully and answer the questions that follow. Give a common name for the devices illustrated. Name each of the devices labelled A, B, and C. State one use of each of the devices named in (ii). State two effects of the use of the device C on the soil. State two ways of prolonging the usefulness of the device labelled A.
  3. Draw the symbols for each of the following electronic components: α) Resistor; β) (p-n junction) diode; γ) Cell; δ) Light Emitting Diode / LED. 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. State the effect of the resistor on the (p-n junction) diode and the light emitting diode when the circuit is closed.
  4. The following activities were carried out in the laboratory. Study them carefully and answer the questions that follow. 10 g of iodated salt was added to 150 ml of water in a beaker. The mixture was stirred thoroughly. Vegetable oil was added to a quantity of water in a corked flask and shaken vigorously, then allowed to stand for some time. Few grams of grinded charcoal were added to water in a beaker and stirred vigorously, then allowed to stand. State what will be observed in each of the activities I, II, and III. Suggest an aim for the experiment. State one difference between what is observed in I and III. State a method of separation for the activity carried out in II.

PART I [40 marks]

Answer all of Question 1

Questions for this section are in the printed paper.

PART II [60 marks]

Answer all of Question 1

Question 1

  1. What is the importance of a fuse in an electrical appliance? State two household appliances that have a fuse.
  2. What is teenage pregnancy? State two causes of teenage pregnancy.
  3. State three precautions against hazards.
  4. State two practices that destroy water bodies. Give two methods of conserving water bodies.

Question 2

  1. What is aerobic respiration? State the main difference between aerobic respiration and anaerobic respiration.
  2. Explain the term potential difference. The potential difference across the terminals of a 100 Ω resistor is 250 V. Calculate the current flowing through the resistor.
  3. Which crop is infected by the Swollen Shoot disease? State the causative organisms of the disease. State the method of spread of the disease. Give two ways of preventing the spread of the disease.
  4. Consider the given elements: 37 X and 209 Y Write the electronic configuration for Y; State the possible ion that could be formed by X to make it more stable.

Question 3

  1. What is a neutralization reaction?
  2. State three physical properties of a soil.
  3. Define the term power. If a machine hauls a packing case of mass 50 kg up a building that is 10 m high in 30 s, calculate the power of the machine. [g = 10 m/s2]
  4. State three areas where technology is used for the benefit of humans.

Question 4

  1. State three ways in which mulching restores soil resources.
  2. Name the two elements that combine to form ammonia gas. Write a balanced chemical equation for the formation of ammonia from the elements named in (i).
  3. The following information is on the feeding habits of some organisms: man feeds on grasscutter; toad feeds on grasshopper; snake feeds on toad; goat feeds on grass; man feeds on hawk; grasshopper feeds on grass; hawk feeds on snake; grasscutter feeds on grass. Use all the information given above to construct a food web.
  4. What is a galaxy? State the relationship between stars and galaxies. Explain briefly the term Milky Way.

Question 5

  1. State three effects of soil erosion on the growth of crop plants. Mention one method of controlling soil erosion.
  2. Name two science-related businesses. State the principles underlying the operation of each of the businesses named in (i).
  3. Explain how the female Anopheles mosquito transmits malaria to humans. State one chemical method of controlling mosquitoes.
  4. Name two fundamental units of measurement. State the physical quantity that one of the units named in (i) measures.