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THE WEST AFRICAN EXAMINATIONS COUNCIL
GHANA

Basic Education Certificate Examination

SCIENCE 2004

THEORY QUESTIONS

ESSAY

This paper is in two sections, A and B
Answer Question 1 in Section A and any other three questions in Section B.
Credit will be given for clarity of expression and orderly presentation of material


PART I
[40 marks]


Answer all of Question 1

    1. Study the simple circuit diagram shown below and answer the questions that follow.

      a diagram of magnetization

      1. Identify the components labelled I, II, III, IV, V and VI

      2. Which component is used to close the circuit?

      3. State the observation that will be made when the circuit is closed.

      4. State the energy transformations that take place when the circuit is closed.

      5. Give the name of the circuit connection between components IV and VI.

    2. The diagram below is an illustration of an experimental set-up used for separating a mixture of water and alcohol. Study the diagram carefully and answer the questions that follow.

      1. State the method of separation shown in the set-up.

      2. Identify liquid Y, with reasons.

      3. Give the functions of the thermometer and the water jacket X.

      4. What physical processes are involved in the method of separating the mixture?

      5. State the physical property which makes it possible to separate the water and alcohol.

    3. A student performed tests on food substances A, B and C and made the following observations

      Food Substance Test Observation
      A Few drops of iodine solution was added to A The iodine solution turns blue-black
      B A drop of B was applied to a white sheet of paper A translucent patch was seen on the paper
      C Benedict's solution was added to C and the mixture boiled Benedict's solution turns from blue to brick-red

      1. Identify food substances A, B and C.

      2. Give the products of digestion of A, B and C.

      3. In which parts of the alimentary canal does the digestion of each of food substances A, B and C start?

      4. In which part of the alimentary canal is food substance C absorbed after digestion?

BackSECTION B