BECE 1993 Integrated Science Paper 2

 

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BECE 1993 INTEGRATED SCIENCE

Essay - Paper 2

1. (a) Define the following terms and give one example of each:

            (i) Element

            (ii) Mixture

            (iii) Compound


(b) Explain the following terms:

        (i) Work

        (ii) Energy


(c) State the units in which each of the following are measured:

        (i) Power

        (ii) Energy

        (iii) Electric current

        (iv) Temperature

(d) A body of mass 100 kg is placed at a point 2 m above the ground. What is the potential energy of the body with reference to the ground? [Take g = 10 ms-2]


(e) State three characteristics of each of the following:

        (i) An insect pollinated flower
        
        (ii) A wind pollinated flower



2. (a) (i) Explain the term balanced diet.

          (ii) Name any two classes of food which should be present in a balanced diet.

        (iii) Give one function of each class of food named in (a) (ii) above.


(b) An object is placed in front of a pinhole camera as shown in the diagram below:

Draw in your answer book a ray diagram (not to scale) to show how the image is formed on the screen of the camera.

(c) State the two laws of reflection of light.

(d) (i) Describe how ions are formed from atoms.

      (ii) State two differences between a proton and an electron.



3. (a) (i) Explain the term electromagnetism.

          (ii) Given a nail, insulated wire, key (or switch) and a battery, show by means of a circuit diagram how the nail can be magnetized.

(b) List three symptoms of malaria.

(c) State three ways of keeping the environment clean.

(d) Write down the names of the new substances formed when the following compounds react:

        (i) Ammonia and dilute hydrochloric acid;

        (ii) Sodium hydroxide and dilute hydrochloric acid;

        (iii) Calcium carbonate and dilute hydrochloric acid.


4. (a) (i) What is meant by a satellite?

          (ii) State one difference between a natural and an artificial satellite.

          (iii) State two uses of artificial satellite.


(b) Give two differences between the mass and weight of a body.

(c) Write the chemical formulae for the following substances.

        (i) Calcium oxide;

        (ii) Water;

        (iii) Copper sulphate



(d) What will be the effect on the colour of blue litmus paper when it is dropped in each of the following solutions?

        (i) Sodium hydroxide solution;

        (ii) Dilute hydrochloric acid;

        (iii) Lime juice;

        (iv) Water


(e) (i) Define breathing.

     (ii) Arrange the following parts of the human being respiratory system in order in which air from the atmosphere pass, through them during breathing:

Trachea, nostrils, lungs and bronchus.

     (iii) Describe briefly what happens to a piece of bread when it reaches the duodenum of a human being.

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