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Home / Science / BECE Past Questions & Answers – 2011 (SCIENCE)

BECE Past Questions & Answers – 2011 (SCIENCE)





1 ¼hours [100marks]

This paper is in two parts,I and II

AnswerQuestion1in Part I and any other four questions in Part II.

Credit will be given for clarity of expression and orderly presentation of material


Answer all of Question1

In an experiment to demonstrate a property of light, three card boards,A,Band C with holes in
their centres are arranged in a straight line between alighted bulb and an observer as shown in
the illustration below.

Study the illustration carefully and use it to answer the questions that follow


(i) What would the observer see from the position shown?

(ii) What would the observer see when card board B is slightly displaced from the line? (iii) Explain the observation made in (a)(ii) above.
(iv) What would be observed when the card board B is brought back to its original position? (v) What property of light is being demonstrated in this experiment?
(vi) Mention

(α) two natural occurrences that could be explained by the property of light demonstrated.
(β) one device that works on the property of light demonstrated.

(b) The diagrams below are illustrations of hazard symbols found in every day life.

Study them carefully and use them to answer the questions that follow:


(i) What does each symbol A, B, C and D represent?

(ii) Name one substance each that is associated with each of the symbols A, B and C

(iii) Name one place where the symbol D can be found. (iv) State two advantages of hazard symbols.

(c) The diagrams below are illustrations of the different types of teeth in humans.

Study them carefully and use them to answer the questions that follow:


(i) Identify each type of teeth labeled A, Band C

(ii) Describe the shape of each of the teeth labeled A,Band C

(iii) State one function of each of the teeth labeled A,Band C

(iv) Name the parts of the teeth labeled I and II [10 marks]

(d) The diagrams below are illustrations of some farm tools.

Study them carefully and use them to answer the questions that follow:


(i) Identify each of the tools labeled A, B, C, D and E.
(ii) Mention one use of each of the tools labeled A, B, C, D and E.


Answer four questions only from this part

2. (a) (i) (ii) What are ruminants?
Give two examples of ruminants

(i) (ii)
What is force?
State two effects of forces on a body

Mention two ways in which the carbon cycle can be maintained.

(ii) State one environmental effect when the carbon cycle is disrupted

(i) Mention the three sub-atomic particles
(ii) State the relative charge one ch of the three sub-atomic particles mentioned in (d) (i)
(iii) Name the particle formed when an atom loses an electron

3. (a) (i) (ii) What is a mixture?
Explain why some mixtures are thoroughly stirred before they are used.

(i) (ii)
What is reflection of light?
State two characteristics of the images formed by plane mirrors

(i) (ii)
What is a fertilizer?
Give one example of an inorganic fertilizer

(i) (ii)
What is indiscriminate sex?
State two dangers of indiscriminate sex on humans

4. (a) (i) What is a simple machine?

(b) (ii)

(i) Give two examples of a simple machine

What is rusting?
(ii) State two effects of rusting

(i) (ii)
What are food nutrients?
Classify the following food items as carbohydrate,fats and oil or protein:

Beans, palm fruits, meat,margarine, bread and maize.

(i) (ii)
State two effects of malnutrition in farm animals. Mention one disease of farm animals caused by virus.

5. (a) (i) What is soil erosion?
(ii) Name two methods of controlling soil erosion

(b) (i) Explain each of the following terms as used in ecology:
(α) Adaptation
(β) Endangered species

(c) (i) (ii) Give one example of hard water
Explain why it is advisable to drink water which is hard.

(i) (ii)
What is magnetic field?
State two methods of making magnets

6. (a) (i) Define each of the following terms:
(α) Solvent
(β) Solute

(ii) Name one common solvent used in the home.

(b) Explain the following terms as used in animal production:
(i)Ration (ii) Dehorning

(i) What is an element
(ii) Write down the symbol of each of the following chemical substances:
(α) Potassium
(β) Sulphur

(d) Explain each of the following terms: (i) Mixed farming
(ii) Mixed cropping CLICK TO VIEW ANSWERS TO PART 2





1. (a) (i) Light rays from the lighted bulb

(ii) Sees no light or a portion of card board B

(iii) Since light moves in a straight line, the observer sees the light only when the holes are in a straight line with the light source. Since light rays cannot bend around the card board B when slightly displaced, the observer does not seethe light

(iv) The observer would seethe light rays from the lighted bulb again.

(v) The property that light travels in a straight line or rectilinear propagation of light

(vi) (α)

Eclipse of the sun (solar eclipse) Eclipse of the moon (lunar eclipse) Day and night
Shadow [anytwo]

(β) camera, microscope, telescope, binoculars, periscope, torch, [anyone]

(b) (i) A – highly inflammable or flammable
B – Irritant or can cause harm
C – Poisonous or toxic or deadly
D – Dangerahead

– liquefied petroleumgas(LPG), petrol, kerosene,spirit, ethanol [anyone]

– Concentrated Hydrochloric acid [Conc. HCl], concentrated sulphuric
acid [conc. H2SO4], concentrated magnesiumhydroxide [Mg(OH)2], concentrated sodium hydroxide [NaOH] [anyone]

C – Dichlorodiphenyltrichloroethane (DDT)[C14H9Cl5],Potassium cyanide
[KCN],Sodiumcyanide[NaCN], mercury [anyone]

(iii) On roads,at construction sites, very high voltage plants/devices, [anyone]

(iv) – They help prevent accidents by making people take precautions.
– They serve as warnings to prevent injuries or death.

(c) (i) A B C – incisor
– premolar / molar
– canine

– chisel shaped
– almost flat surface with small projections / cusps /ridges
– pointed

– Biting or cutting
– chewing or grinding or mashing
– tearing

– enamel / crown
– root

– Gardenfork
– Spade
– hand trowel
– hand fork
– wateringcan

– Breaking up soil or making soil loose or ploughing soil or turning over soil

– Collecting soil or mixing substance such as animal feed or digging groundormakingsurfaceofgroundlevel

– earthing up crops or transplanting seedlings or spreading fertilizer or
manuring or mounding certain crops

– Breaking up soil or making soil loose or ploughing soil or turning over soil

– Wateringsoil /crops

2. (a) (i) Ruminants arecud-chewinghoofed mammals with multiple-chambered stomach.

(ii) Examples: camel,goat, sheep,giraffe, cow

(b) (i) A forceisapush or pullexerted on abody.

(ii) A physical influence that tends to change the position or shape of an object with mass

Effects of forces ona body:
• Can cause a moving body to cometo rest (stop moving)
• Can cause a body at rest to move
• Can cause a moving body to accelerate
• Can cause a moving body to decelerate
• Can change the direction of a moving body
• Can changethe shapeofabody [anytwo]

(c) (i) Ways of maintaining the carbon cycle:
• Afforestation (planting new trees to replace the ones that have been destroyed or cut down)
• Photosynthesis
• Respiration
• Reducing the amount of carbon dioxide emissions from industries
• Avoiding excessive bushburning
• Reducing the amount of fumes from vehicles [anytwo]

(ii) Environmental effects
• Global warming as a result of the depletion of the ozone layer
• Increase in volume of sea water due to melting of ice bergs
• Green house effect [anyone]

(d) (i) Protons, neutrons and electrons

Proton positive(+1)
Neutron no charge or neutral (0)
Electron negative(– 1)


3. (a) (i) A mixture is
A physical combination of two or more substances
A substance consisting of two or more substances that have been combined physically

Why some mixtures are thoroughly stirred before they are used:

To attain a uniform mixture or to make it homogenous, since the original mixture may
not be uniform or there may be some suspended particles of the solute



Reflection of light is
The bouncing back or redirection of light when it strikes a surface

Characteristics of images formed by plane mirrors:
 Same size as object
 Same distance from mirror as object
 Virtual
 Erect /upright
 Laterally inverted [any two]

A fertilizer is:

Any substance usually added to or spread onto soil to increase its ability to support plant
Or: A substance added to soil to increase its nutrient content or fertility


Examples of in organic fertilizer:

NPK or ammonium sulphate or urea or potassium chloride (or muriate of potash)



Indiscriminate sex
Having sexual inter course with multiple (two or more) partners and usually without
protection (use of condom)

Dangers of indiscriminate sex
 Contracting sexually transmitted diseases (STDs),such as AIDS, syphilis, etc
 Teenage pregnancy(where teenagers are involved)
 Abortion, which is usually quit and dangerous to the mother
 Loss of social respect /reputation
 Loss of self-esteem [any two]

4. (a) (i) A simple machine

A mechanical device that makes work easier and/ or faster

Examples of simple machines
Bottle opener, wheel barrow, nut cracker, inclined plane, spanner, crowbar, etc

Rusting is
the corrosion (wearing away) of the surface of iron or steel due to the formation of iron
or: the formation of a red dish brown coating of iron oxide on the surface of iron or steel that forms when the metal is exposed to air and moisture


Effects of rusting:
• Shortage of life span of item
• Loss of beauty of item
• Reduction in effectiveness of implement
• Collapse of buildings [any two]

Food nutrients

Chemical substances, found in food, that the body needs in order to function properly


Bread palm fruits beans
Maize margarine meat

Effects of malnutrition in farm animals
 Deficiency diseases
 Stunted growth
 Low energy and activity(lack of vitality)
 Slow recovery from illnesses
 Death
 Lower reproduction [any two]

Disease caused by virus
 Rabies
 Bird flu

 Newcastle
 Rinder pest [anyone]

5. (a) (i) Soil erosion:
The washing away of the top soil by agents of erosion
Or: The removal of soil material by natural processes,principally running water, glaciers, waves, and wind

(ii) Methods of controlling soil erosion:
• Planting of cover crops
• Planting of grasses
• Planting of wind brakes (trees)
• Ploughing across slopes
• Terracing
• Strip cropping [any two]

(b) (i) (α) Adaptation:
The development of physical and behavioral characteristics that allow organisms
to survive and reproduce in their habitats

(β) Endangered species
Species threatened by extinction:
Or: Species whose numbers are so few, or are declining so quickly, that the animal, plant, or other organism may soon become extinct



Example of hard water
Deep well water
Bore hole water

It is advisable to drink hard water because
it contains dissolved mineral salts, such as calcium and magnesium salts, which are
necessary to maintain good health and proper functioning of the body.

NB: (Minerals are essential for the healthy growth of teeth and bones. They also help in
cellular activities, such as enzyme action, muscle contraction, nerve reaction, and blood

Magnetic field:
A region of space surrounding a magnet or current-carrying circuit in which the resulting
magnetic force can be detected

Methods of making magnets

 Electrical method
 Single stroking
 Double stroking
 Induction
 Hammering [any two]

6. (a) (i)

(α) Solvent:
A substance that dissolves things:
Or: A substance in which other substances are dissolved, usually a liquid

(β) Solute
A substance that is dissolved in another substance

(ii) Common solvent used in home
Water,Turpentine, liquid soap, alcohol, kerosene [anyone]

A fixed and limited amount of feed,given to an animal or group of animals at specific
times / intervals.
This is done to ensure that the animal has the right amounts of essential food nutrients for
healthy growth and development.

Removing or preventing the growth of the horns of an animal by surgery or cauterization.
This is done primarily to prevent animals from using them to injure other animals or
destroy property

A substance that is made up of the same kind of atoms
Any substance that cannot be broken down into a simpler one by a chemical reaction

(α) Potassium – K
(β) Sulphur – S

Mixed farming:
The cultivation of crops and the rearing of livestock on the same farm at the same time
Or: farming that combines growing crops and rearing livestock on the same farm at
the same time

Mixed cropping
The cultivation of different kinds of crops on the same piece of land at the same time

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