BECE 2002 Integrated Science Paper 2

   

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BECE 2002 INTEGRATED SCIENCE (APRIL)

Essay - Paper 2

 Answer three questions only from this section.

Illustrate your answers wherever possible, with large, clear and fully labelled diagrams. Credit will be given for clarity of expression and orderly presentation of material.

All questions carry equal marks

 
1. (a) Name four characteristics of non-living things.

    (b) Mention two functions of each of the following parts of a plant:

            (i) leaves

            (ii) roots


(c) Classify the following actions as voluntary or involuntary:

        (i) eating
    
        (ii) walking

        (iii) sneezing

        (iv) laughing


(d) (i) Explain the difference between a physical change and a chemical change.

       (ii) Write down the chemical equation for the preparation of carbon dioxide in the laboratory.


(e) (i) What is a machine?

       (ii) Write down an expression for the efficiency of a machine.



2. (a) (i) Mention four female sexual characteristics of a human being.

           (ii) Name two sense organs in mammals

            (iii) Give one function of each of the sense organs named


(b) Define each of the following terms:

        (i) compound

        (ii) element


(c) List the particles that make up an atom 

(d) State the energy changes that take place in each of the following processes.

        (i) An orange falls from a tree to the ground

        (ii) A carpenter hits a nail with a raised hammer.

3. (a) (i) State three human activities that can cause an increase in soil erosion

        (ii) Give three ways of preventing soil erosion in agriculture.



(b) Describe briefly how a mixture of sand and common salt could be separated


(c) (i) Define work

       (ii) State the unit of work


(d) (i) Distinguish between heat and temperature

     (ii) State the units of heat and temperature


4. (a) Name the organism that causes each of the following diseases:

            (i) cholera

            (ii) malaria

            (iii) tuberculosis

            (iv) ringworm


(b) State one method of preventing each of the diseases in (a) above.



(c) A ray of light hits the surface of a plane mirror at an angle of 55°.

        (i) Draw a ray diagram showing the normal, incident ray and the reflected ray.

        (ii) What is the angle of reflection for the ray.


(d) State two properties of the image formed in a plane mirror.


(e) Write the chemical names of each of the following compounds:

        (i) MgCl2

        (ii) FeS

        (iii) NH4OH

        (iv) AgCl

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