BECE Past Questions & Answers – 2005 (SCIENCE)

April 2005

SCIENCE

SECTION A OBJECTIVE TEST
45 minutes

1. Hydrogen is represented by the chemical symbolH2. This symbol represents
A. two molecules of hydrogen
B. two atoms of hydrogen
C. two elements of hydrogen
D. two ions of hydrogen

2. A metal expands when there is
A. an increase in heat energy
B. an increase in number of electrons
C. a decrease in potential energy
D. a decrease in distance between atoms

3. A safety device which opens an electrical circuit to prevent too much current from passing through the circuit is the
A. earth wire
B. lightning conductor
C. fuse
D. switch

4. An object is placed 20cm in front of a plane mirror. The distance between the object and the image is
A. 20 cm B. 40 cm C. 60 cm D. 80 cm

5. In which of the following circuit diagrams below will the bulb light?

a1

6. The source of all forms of energy can be traced to
A. clouds
B. earth quakes
C. tides
D. sunlight

7. When a mango is falling from a tree, its potential energy is changed to
A. sound energy
B. heat energy
C. kinetic energy
D. chemical energy

8. Electricity is used by appliances to do work. This means that electricity is a form of
A. energy
B. force
C. generator
D. machine

9. A force of 2Nmovesabodythroughadistanceof10 m. Calculate the work done.
A. 5 J B. 8 J C. 12 J D. 20 J

The diagram below shows a lever system used to move a stone. Use it to answer Questions 10 and 11

a2

10. The distance X is the A. effort distance B. load distance C. fulcrum
D. lever arm

11. Less effort is required to move the stone when the
A. distance Y is equal to X
B. distance Y is greater than X C. distance Y is less than X
D. stone is at the pivot

12. An omnivore is an animal that feeds on
A. raw food
B. fresh foods
C. cooked foods
D. all kinds of food

13. A meal containing all the essential nutrients in the right amounts is said to be
A. delicious
B. balanced
C. well-cooked
D. rich in fibre

14. The disease associated with insufficient in take of proteins in children is
A. goiter
B. kwashiorkor
C. rickets
D. scurvy

15. When testing for proteins in a food substance using Fehling’s solution, the expected colour change is
A. blue
B. purple
C. blue-black

D. brick-red

16. The substance that enables green plants to trap sunlight for the manufacture of food is
A. chlorophyll B. chloroplast C. phloem
D. xylem

17. In man, the conversion of poisonous substances into harmless forms takes place in the
A. bladder
B. duodenum
C. kidney
D. liver

18. Which of the following life processes is represented by the equation below?
Glucose +Oxygen→ Water +Carbon dioxide + Energy
A. Digestion
B. Excretion
C. Photosynthesis
D. Respiration

19. Chlorine gas is passed through water during purification to
A. kill germs
B. cause suspended particles to settle
C. soften the water
D. give taste to the water

20. Arrange the following sources of water in the order of increasing contamination
I. Rain
II. Stream
III. Well
IV. Borehole

A. I,II,IV,III B. II,III,I,IV C. I,IV,III,II D. III,II,IV,I

21. A solution in which no more solute will dissolve at a given temperature is said to be
A. concentrated
B. dilute
C. homogeneous
D. saturated

22. A clear solution of sugar was cooled from 100°C to 25°C. Some solid sugar was seen to have formed out of the solution after cooling. This shows that sugar
A. does not dissolve in cold water
B. does not dissolve in hot water
C. dissolves more in hot water than in cold water
D. dissolves more in cold water than in hot water

23. Water is sometimes referred to as a universal solvent because it
A. is the purest liquid on earth
B. is the commonest liquid on earth
C. is found in all living cells
D. dissolves most substances

24. The charge of sulphur in the compound SO2is
A. -2
B. +2
C. -4
D. +4

25. The part of the soil that supports plant growth is that part which
A. dissolves in water
B. retains less water
C. contains the humus
D. is closer to the roots

26. Plants do not grow wellin gravel because the
A. air spaces are too big to hold water B. air spaces are too small for the roots C. particles cannot absorb air
D. particles cannot contain nutrients.

27. Which of the following parasites lives in the blood of humans?
A. Louse
B. Plasmodium
C. Tapeworm
D. Tick

28. Th e carrier of the malaria parasite is the
A. black fly
B. tsetse fly
C. female anopheles mosquito
D. male anopheles mosquito

29. Which of the following practices is a method of controlling guinea worm disease?

A. Clearing bushes around homes
B. Ensuring that rivers flow rapidly
C. Protecting one’s feet before stepping into rivers
D. Protecting one’s self against mosquito bites.

30. The humidity of the atmosphere is measured with
A. an anemometer
B. a barometer C. a hygrometer D. a hydrometer

31. How long does it take the moon to move completely around the earth?
A. 1 day
B. 28 days C. 30 days D. 365 days

32. Steel is an example of a
A. solid in solid mixture B. solid in liquid mixture C. gas in solid mixture
D. liquid in liquid mixture

33. Which of the following elements is a metal?
A. Carbon B. Nitrogen C. Sulphur D. Sodium

34. Metals that are usually used to make ornaments have low
A. conductivity
B. ductility
C. malleability
D. reactivity

35. The food processing method in which germs are prevented from multiplying by applying a low temperature is
A. canning
B. drying
C. pickling
D. refrigeration

36. The function of blood platelets is to
A. carry carbon dioxide. B. fight against diseases

C. help in clotting
D. help maintain constant body temperature

37. A fish is able to swim with little resistance in water because it has
A. fins
B. gills
C. a stream lined body
D. the ability to make use of a limited oxygen supply.

38. When a person jumps up, he/she is able to comedown because of the
A. pull of the earth’s gravitational force
B. pull of the earth’s magnetic force
C. resistance of the earth’s atmosphere to the upward motion
D. pressure of the earth’s atmosphere on the person

39. A metal displaces 5.0 cm3ofwaterwhencompletelyimmersed in water.If the mass of the metal is 35.0 g, calculate its density.
A. 7.0 gcm-3
B. 30. 0 gcm-3
C. 40.0 gcm-3
D. 175.0 gcm-3

40. Oxygen from the air is able to get into the blood by
A. capillarity B. diffusion C. osmosis
D. suction




CLICK TO VIEW ANSWERS TO OBJECTIVES
April2005

SCIENCE Section A

SOLUTIONS

OBJECTIVE TEST

1. B. two atoms of hydrogen

2. A. an increase in heat energy

3. C. fuse

4. B. 40 cm

5. B.

6. D. sunlight

7. C. kinetic energy

8. A. energy

9. D. 20 J

10. B. load distance

11. B. distance Y is greater than X

12. D. all kinds of food

13. B. balanced

14. B. kwashiorkor

15. D. brick-red

16. A. chlorophyll

17. D. liver

18. D. Respiration

19. A. kill germs

20. C. I,IV,III,II

21.
D.
saturated

22.
C.
dissolves more in hot water than in cold water

23.
D.
dissolves most substances

24.
D.
+4

25.
C.
contains the humus

26.
D.
particles cannot contain nutrients

27.
B.
Plasmodium

28.
C.
female anopheles mosquito

29.
C.
Protecting one’s feet before stepping into rivers

30.
C.
a hygrometer

31.
B.
28 days

32.
A.
solid in solid mixture

33.
D.
Sodium

34.
D.
reactivity

35.
D.
refrigeration

36.
C.
help in clotting

37.
C.
a stream lined body

38.
A.
pull of the earth’s gravitational force

39.
A.
7.0 gcm-3

40.
B.
diffusion