31. One feels uncomfortable when the atmosphere becomes humid because
A. the concentration of oxygen in the air decreases
B. gravitational force acting on the body increases
C. the water content of the body rises
D. sweat produced evaporates slowly
32. A quality of NaCl was dissolved in 100.0 cm3 of solution to obtain 0.5 M NaCl solution. Calculate the mass of NaCl used. [Na = 23.0, Cl = 35.5]
A. 2.93 g
B. 5.85 g
C. 29.25 g
D. 58.50 g
33. Which of the following substances pollutes the air?
A. Excess fertilizer
B. Putrefying eggs
C. Scrap metal
D. Urine
34. The causative organism of syphilis is a
A. bacterium
B. protozoan
C. virus
D. worm
35. It is obligatory to wear goggles when handling substances that
A. are corrosive
B. are highly inflammable
C. are poisonous
D. emit sparks
36. One of the features which indicates sexual maturity in boys is
A. growth of gray air
B. expansion of the pelvic girdle
C. growth of hair in the armpits
D. expansion of the mammary glands
37. When soil is mixed thoroughly with water in a cylinder and allowed to settle, the topmost layer is
A. colloidal clay
B. mineral water
C. organic matter
D. silt particles
38. Nitrogen may be lost from the soil through
A. ammonification
B. deamination
C. nitrification
D. volatization
Use the practices listed below to answer questions 39 and 40.
I. Galvanizing
II. Electroplating
III. Greasing
IV. Oiling
39. All the practices listed above are meant to
A. increase the tensile strength of metals
B. prevent corrosion of metals
C. prevent metals from emitting radiation
D. increase the luster of metals
40. Which of the practices do metallic buckets undergo during production?
A. I only
B. II only
C. I and III only
D. II and IV only
41. Determine the volume of 2.0 M HCl solution which should be diluted with distilled water to obtain 50 cm3 of 0.1 M HCl solution
A. 2.5 cm3
B. 4.5 cm3
C. 5.0 cm3
D. 25.0 cm3
42. Under which of the following weather conditions will the blood vessels in the skin constrict?
A. Hot weather
B. Humid weather
C. Dry weather
D. Cold weather
43. Which of the following materials is used in making domestic water pipes?
A. Chlorofluoro carbon
B. Perpex
C. Polytetra fluoro ethane
D. Polyvinyl chloride
44. Which of the following elements is not present in protein?
A. Calcium
B. Nitrogen
C. Phosphorus
D. Sulphur
45. Carbon (IV) oxide is used to extinguish fires because it
A. occurs naturally in ordinary water
B. is fully oxidized
C. is heavier than air
D. is a reducing agent
46. Viral diseases of crops are usually controlled by
A. improving sanitation on the farm
B. using the recommended chemicals
C. planting early during the season
D. planting resistant varieties
47. Which of the following instruments can be used to measure the diameter of a thin wire?
A. Meter rule
B. Micrometer screw gauge
C. Pair of callipers
D. Tape measure
48. Transfusion of in compatible blood in patient may lead to the
A. formation of clots of blood
B. production of antigens
C. rupture of the red blood cells
D. reduction in the number of white blood cells
49. Which of the following parts of a flower forms the innermost whorl?
A. Androecium
B. Calyx
C. Corolla
D. Gynoecium
Use the following characteristics of substances to answer questions 50 and 51
I. High melting point
II. High solubility in water
III. Low melting point
IV. High electrical conductivity in solution
50. Which of the above characteristics are true of ionic compounds?
A. I and II only
B. I and III only
C. I and IV only
D. I, II and IV only
51. Characteristics IV above is true for NaCl because it
A. forms ions in solution
B. dissolves in water to form a solution
C. produces a tasty solution
D. forms a colourless solution
52. A car traveling at a uniform speed of 40.0 m/s covers the distance between two stations in 2.0 minutes. Calculate the distance between the stations
A. 0.2 km
B. 2.4 km
C. 4.8 km
D. 8.0 km
53. The force which opposes the relative motion of two surfaces in contact is
A. electrostatic force
B. frictional force
C. gravitational force
D. magnetic force
Use the equation below to answer questions 54 and 55
HNO3(aq) + NaOH(aq) --> NaNO3 + H2O
54. The reaction represented by the equation is an example of
A. double decomposition reaction
B. direct combination reaction
C. neutralization reaction
D. dissolution reaction
55. Which of the numbered substances in the equation is a salt?
A. I
B. II
C. III
D. IV
56. One hazardous substance that may be contained in car exhaust fume is
A. H2
B. CO
C. H2O
D. CO2
57. Organic manure is much preferred to inorganic fertilizers because
A. manure is less bulky than organic fertilizers
B. manure suppresses the growth of weeds while inorganic fertilizers do not
C. manure can bind soil particles together while inorganic fertilizers do not
D. unlike inorganic fertilizers, organic manure does not spread disease
58. Tsetsefly is the vector of
A. elephantiasis
B. malaria
C. river blindness
D. sleeping sickness
59. The function of villi of the small intestine is to
A. allow enzymes to act faster on food substances
B. allow easy passage of undigested food into the colon
C. facilitates diffusion of lymph
D. provide a large surface are for absorption
60. Which of the following petroleum fractions is used in road construction?
A. Bitumen
B. Diesel
C. Heavy oil
D. Naphtha
