Science

1. An advantage of practicing organic farming is that it

a) increases soil fertility.
b) reduces pest infestation.
c) reduces toxicity levels in plants.
d) increases resistance to plant disease.

2. The instrument used to measure potential difference across a resistor is

a) ammeter.
b) barometer.
c) hydrometer.
d) volumeter.

3. What is the power of the machine?

a) 50 W
b) 20 W
c) 10 W
d) 2 W

4. Determine the potential energy of a block of mass 2kg placed on a building 10m tall [g=10ms⁻²]

a) 20J
b) 50J
c) 100J
d) 200J

5. Purple coloration of leaves of plant is a major symptom of deficiency in

a) calcium
b) nitrogen
c) potassium
d) phosphorus

6. Which of the following statements about the base of a transistor are correct? The base is

a) I and II only
b) I and III only
c) II and III only
d) I, II and III

7. A farming system which involves the growing of rice and the rearing of fowls is known as

a) crop rotation
b) mixed farming.
c) mixed cropping
d) organic farming

8. Which of the following instruments is connected in parallel across a resistor in an electrical circuit?

Ammeter
Voltmeter
Ohmmeter
Galvanometer

9. The current flowing through a resistor of resistance 10 ohms is 2.5 A. What is the potential difference between the terminals of the resistor?

4V
12.5V
25V
50V

10. Which of the following chemical substances can be used to remove permanent hardness in water?

NaHCO₃
Na₃CO₂
Ca(HCO₃)₂
CaCO₃

11. An atom has 20 nucleons and 9 protons. What is its neutron number?

9
10
11
12

12. An aluminium cube of side 2m has mass 24kg. Determine the density of aluminium.

3 kgm⁻³
12 kgm⁻³
24 kgm⁻³
48 kgm⁻³

13. The proper way of maintaining soil structure and fertility is termed as soil

conservation
depletion
profile.
erosion.

14. Which of the following methods can be used to prevent iron from rusting? I. Painting II. Alloying III. Keeping the iron in a desiccator IV Keeping iron in a moist environment

I and II only
II and IV only
I, II and III only
II, III and IV only

15. Which of the following chemical symbols is that of an element with seven electrons in the outermost shell?

₂₀Ca
₁₇Cl
₁₀Ne
₁₆S

16. Which of the following chemical equations is balanced?

a) H₂ + Cl₂ → HCl
b) K₂O → K + O₂
c) Mg + O₂ → MgO
d) 2Na + Cl₂ → 2NaCl

17. A machine lifts a load of 100N through a vertical distance of 2m in 10s. Use the information to answer questions 27 and 28. What is the work done by the machine?

a) 50J
b) 100J
c) 200J
d) 400J

18. When an atom loses an electron, the ion formed is called

a) an anion
b) a cation
c) a molecule
d) a compound

19. In an experiment to determine the various particle sizes of soil by sedimentation, the particles above clay suspension are

loam.
organic matter.
gravels.
silt

20. The function of the white blood cells in humans is to

a) produce haemoglobin
b) ensure blood clot during an injury.
c) produce antibodies to engulf disease-causing organisms.
d) produce digestive enzymes

21. Mosquito pupa breathes through tubes called

trachea.
siphon.
lungs.
gills.

22. An atom of an element has neutral charge because the

protons and electrons are the same particles.
proton number and electron number are the same.
neutron number and proton number are equal.
electron number and neutron number are equal.

23. What is the systematic name of the compound CO?

Carbon(1) oxide
Carbon(II) oxide
Carbon dioxide
Carbon(IV) oxide

24. An example of the process of osmosis is

selective reabsorption of water in kidney.
absorption of digested food.
the spread of petrol scent.
gaseous exchange in living things.

25. Which of the following elements is a macro-nutrient of plants?

a) Copper
b) Iron
c) Nitrogen
d) Zinc

26. Which of the following statements about reproduction in animals is true?

a) The female produces sperm.
b) The male produces ova.
c) The fusion of sperm and ova produces a zygote.
d) The zygote develops into a larva.

27. One of the properties of acids is that they

a) turn wet blue litmus paper red.
b) have no effect on blue litmus paper
c) turn wet red litmus paper blue
d) are neutral to litmus paper.

28. Heat from the sun reaches the earth by I conduction II. convection III. radiation

I only
II only
III only
I, II and III

29. Which of the following substances is a compound?

Oxygen
Magnesium
Water
Sodium

30. Which of the following diseases is not a deficiency disease?

Scurvy
Cholera
Beriberi
Goitre

31. Which of the following organisms is an ecto-parasite of animals?

Fleas
Tapeworm
Liver fluke
Roundworm

32. Which of the following fruits is dispersed by water?

Coconut
Mango
Maize
Cocoa

33. Which of the following statements about aerobic and anaerobic respiration is not correct?

a) Water is produced as a by-product in aerobic respiration
b) Alcohol or lactic acid is produced in anaerobic respiration
c) No oxygen is required in anaerobic respiration
d) Very little energy is released in aerobic respiration

34. Which of the following machines are complex machines?

a) I and II only
b) I and III only
c) II and III only
d) I, II and III

35. Which of the following activities are cultural practices in vegetable production? 1. Application of fertilizer II. Harvesting III. Mulching

I and II only
I and III only
II and III only
I, II and III

36. If a soil is smooth and sticky, it means that the soil has a large amount of

a) clay.
b) loam.
c) sand.
d) silt.

37. A person urinates more often in the rainy season than in the dry season because

a) more sweat evaporates from the skin
b) less sweat evaporates from the skin.
c) his kidneys work faster.
d) he drinks less water.

38. The instrument that can be used to measure accurately the mass of a substance is

a) beam balance.
b) spring balance.
c) eureka can.
d) measuring cylinder.

39. Which of the following organisms attacks crops in storage?

Crickets
Grasshoppers
Millipedes
Weevils

40. Calcium oxide and water reacts to form calcium hydroxide. The formula for the product is

a) Ca₂OH
b) Ca(OH)₂
c) CaH₂O
d) Ca(H₂O)₂