The correct option for each question is shown in bold with a tick (✔). A few questions are ambiguous and carry a short note.

1. Mercury has a relative density of 13.6. Determine the density of mercury. [Density of water = 1.0 × 10³ kg m⁻³]

A.  13600 kg m⁻³  ✔

B.  999.136 kg m⁻³

C.  0.0136 kg m⁻³

D.  1000.136 kg m⁻³

Density = 13.6 × 1000 = 13600 kg m⁻³

2. An example of a plant with runners is

A.  canna lily.

B.  cocoyam.

C.  banana.

D.  sweet potato.  ✔

3. Which of the following instruments are percussion instruments? I. Cymbals II. Violin III. Gong gong

A.  I only

B.  I, II and III

C.  I and II only

D.  I and III only  ✔

4. Thrombocytes are produced in the

A.  bone marrow.  ✔

B.  blood plasma.

C.  lymph nodes.

D.  blood cells.

5. The systematic name of the compound SO₃ is

A.  Sulphur(VI) trioxide.  ✔

B.  Sulphur trioxide.

C.  Sulphur(VI) oxide.

D.  Trioxide sulphur(V).

6. Which statements about pests and parasites are correct? I. Pests are always found in crops and animals. II. All parasites are not pests. III. Parasites attack only animals.

A.  I, II and III

B.  I and III only

C.  II and III only

D.  I and II only  ✔

III is false, which leaves D.

7. A ball of mass 250 g is at a height of 12 m. Determine its potential energy. [g = 10 m s⁻²]

A.  3000 J

B.  3 J

C.  300 J

D.  30 J  ✔

PE = mgh = 0.25 × 10 × 12 = 30 J

8. Which practice is not used for identifying farm animals?

A.  Branding

B.  Ear-tagging

C.  Culling  ✔

D.  Tattooing

9. The layer of the atmosphere in which air moves in a horizontal direction is

A.  Stratosphere.

B.  Troposphere.  ✔

C.  Mesosphere.

D.  Biosphere.

10. The most important role of legumes in soil conservation is

A.  fixing nitrogen in the soil.

B.  adding humus to the soil.

C.  promotion of run-off.

D.  checking erosion.  ✔

Legumes are also the classic example of nitrogen fixers, so A is a tempting choice. The question asks about conservation, which points to D.

11. Which structure is found in the middle ear of humans?

A.  Malleus  ✔

B.  Tympanic membrane

C.  Semi-circular canal

D.  Cochlea

12. One effect of acid rain on humans is that it

A.  can cause respiratory diseases.  ✔

B.  causes damage to the respiratory system.

C.  causes skin cancer.

D.  damages the immune system.

13. Which statement about small scale industry is correct? It

A.  is always in rural areas.

B.  makes use of advanced technology.

C.  operates with minimum input of materials.  ✔

D.  is always capital intensive.

14. When a p-n junction diode is forward-biased, I. the positive terminal of a cell is connected to the p-type. II. the junction becomes narrower. III. electric current flows across the junction.

A.  I and III only

B.  I and II only

C.  I, II and III  ✔

D.  II and III only

15. The following activities lead to global warming except

A.  afforestation.  ✔

B.  deforestation.

C.  breeding of cattle.

D.  cooking of food.

16. The product of mass and velocity of a body is known as its

A.  newton.

B.  inertia.

C.  moment.

D.  momentum.  ✔

17. The term supplying as used in crop production means

A.  distributing bagged maize to wholesalers.

B.  watering the crop during the dry season.

C.  application of fertilizer to crops.

D.  re-planting of ungerminated stands.  ✔

18. The following alloys contain copper except

A.  bronze.

B.  steel.  ✔

C.  brass.

D.  duralumin.

19. Which organism converts ammonium compounds into nitrites?

A.  Nitrosomonas  ✔

B.  Azotobacter

C.  Rhizobium

D.  Nitrobacter

20. The pressure at a point in water is 560 kPa. If the density of water is 1000 kg m⁻³, determine the depth. [g = 10 m s⁻²]

A.  1785.0 m

B.  56.0 m  ✔

C.  0.0178 m

D.  560.0 m

h = P/ρg = 560000 ÷ (1000 × 10) = 56 m

21. Which organ removes bile pigments from the blood in humans?

A.  Kidneys

B.  Gall bladder

C.  Lungs

D.  Liver  ✔

22. Which items are recommended to extinguish small fires? I. Fire blanket II. Sand bucket III. Carbon(IV) oxide

A.  I and II only

B.  II and III only

C.  I and III only

D.  I, II and III  ✔

23. A hydrocarbon C₃H₄ is an example of

A.  alkyne.  ✔

B.  alkanoate.

C.  alkene.

D.  alkane.

24. The mode of heat transfer which does not need a material medium is I. convection. II. conduction. III. radiation.

A.  I only

B.  II and III only

C.  III only  ✔

D.  I, II and III

25. The expressed characteristics of an organism is referred to as

A.  variation.

B.  phenotype.  ✔

C.  allele.

D.  genotype.

26. One of the gases responsible for global warming is

A.  oxygen.

B.  carbon dioxide.  ✔

C.  nitrogen.

D.  water vapour.

27. The branch of the posterior vena cava into the kidney is called

A.  hepatic portal vein.

B.  renal artery.

C.  hepatic vein.

D.  renal vein.  ✔

28. One advantage of soft water is its

A.  source of essential minerals such as calcium.

B.  difficulty to lather with soap.

C.  ease with which it lathers with soap.  ✔

D.  abundance in nature.

29. Which parasite could be controlled by drenching?

A.  Lice

B.  Flukes  ✔

C.  Fleas

D.  Ticks

30. The earth wire I. is coloured red. II. carries charges to earth. III. is buried in the earth in the home.

A.  I, II and III

B.  I and III only

C.  II and III only  ✔

D.  I and II only

31. Isotopes of carbon have proton number

A.  6.  ✔

B.  12.

C.  8.

D.  14.

32. The energy transformation when batteries are operating is

A.  chemical to light.

B.  electrical to chemical.

C.  chemical to electrical.  ✔

D.  electrical to light.

33. The chemical formula of iron(II) trioxosulphate(IV) is

A.  Fe₂(SO₄)₃

B.  Fe₂(SO₃)₃

C.  Fe₃(SO₃)₂

D.  FeSO₃  ✔

34. In the human skeleton the humerus is joined posteriorly to the

A.  ulna.

B.  clavicle.

C.  scapula.  ✔

D.  radius.

35. Which pair of elements forms an ionic compound?

A.  Fluorine and magnesium  ✔

B.  Boron and silicon

C.  Carbon and hydrogen

D.  Sodium and lithium

36. Which are benefits of radioisotopes in agriculture? I. Food preservation II. Plant breeding III. Pest control IV. Sterilization

A.  I, II, III and IV  ✔

B.  II and IV only

C.  I, III and IV only

D.  I and II only

37. Which force is mainly reduced when a lubricant is applied to the moving parts of an engine?

A.  Gravitational force

B.  Magnetic force

C.  Frictional force  ✔

D.  Centripetal force

38. Coronary thrombosis occurs when

A.  systolic blood pressure is higher than diastolic blood pressure.

B.  an artery bursts in the brain under high pressure.

C.  low blood pressure reduces cardiac output.

D.  a blood clot blocks the arteries supplying blood to the heart.  ✔

39. The term coitus interruptus in family planning means

A.  applying creams inside the vagina before sexual intercourse to kill sperm.

B.  cutting off the sperm ducts and tying them through surgical operation.

C.  avoiding sexual intercourse.

D.  withdrawing the penis from the vagina just before ejaculation.  ✔

40. Damping-off is a common disease of

A.  yam sett.

B.  seedlings.  ✔

C.  groundnut.

D.  maize grains.

41. The best instrument to measure the internal diameter of a pipe is the

A.  micrometer screw gauge.

B.  vernier calipers.  ✔

C.  metre rule.

D.  mathematical set rule.

42. Generation of electrical power is possible using

A.  biogas.  ✔

B.  compost preparation.

C.  incineration.

D.  recycling of waste materials.

43. Which feedstuffs are main sources of energy for poultry? I. Barley II. Copra cake III. Wheat bran

A.  I, II and III

B.  I and II only

C.  II and III only

D.  I and III only  ✔

Copra cake is a protein source.

44. Which function is not associated with soil water?

A.  Source of water for soil organisms

B.  Dissolving soil nutrients

C.  Reducing soil temperature  ✔

D.  Decomposition of organic matter

All four options are plausible, since soil water does moderate temperature. C is the most likely intended answer.

45. One difference between arteries and veins is that arteries generally

A.  have large lumen and veins have smaller lumen.

B.  carry blood under high pressure and veins carry blood under low pressure.  ✔

C.  carry blood to the heart and veins carry blood away from the heart.

D.  have valves and veins do not have valves.

46. A blue shirt viewed under red light will appear

A.  cyan.

B.  yellow.

C.  black.  ✔

D.  white.

47. Canned food containers are prevented from rusting by coating with

A.  copper.

B.  zinc.

C.  tin.  ✔

D.  steel.

48. A mass of 8 g NaOH was dissolved in 250 cm³ of solution. Determine the molar concentration. [NaOH = 40]

A.  8.0 M

B.  0.6 M

C.  0.8 M  ✔

D.  0.4 M

Moles = 8 ÷ 40 = 0.2 mol. Concentration = 0.2 ÷ 0.25 L = 0.8 M

49. Ammonia gas cannot be collected over water because the gas is

A.  highly combustible.

B.  lighter than air.

C.  denser than air.

D.  extremely soluble in water.  ✔

50. Which structure is not part of the embryo sac in a flowering plant?

A.  Synergids

B.  Polar nuclei

C.  Pollen tube  ✔

D.  Egg nucleus

Quick Answer Key