1.
Calculate the kinetic energy of the girl.
6000J
3000J
170J
40J
Answer: B
2.
A rigid bar that is supported at a point which turning occurs is
lever.
pulley.
wheel and axle.
inclined plane.
Answer: A
A lever is a simple machine that consists of a bar that pivots on a fixed support or fulcrum
A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt
The wheel and axle consists of a wheel attached to a smaller axle so that these two parts rotate together in which a force is transferred from one to the other. A hinge or bearing supports the axle, allowing rotation. It can amplify force; a small force applied to the periphery of the large wheel can move a larger load attached to the axle
An inclined plane, also known as a ramp, is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load
Other Types Of Simple Machines
A wedge is a simple machine that almost looks like a ramp or an inclined plane. It is actually made up of two inclined planes joined together
A screw is simply an inclined plane around a cylinder.Screw has ridges winding around it. The correct term for the ridges (or grooves) around the shaft or cylinder is the thread.
3.
A solution of volume 500cm3 contains 9.80g 0f H2SO4. Determine its molar concentration.
[S=32, O=16, H=1]
0.10M
0.20M
0.40M
0.50M
Answer: B
4.
In beta decay, the particle emitted is
electron.
neutron.
helium nucleus.
hydrogen atom.
Answer: A
5.
The centre of gravity of a body is
always at its centre
a point where its total mass is always concentrated
always at its end
a point where it can be supported to be in equilibrium
Answer: B
6.
Reflection of light occurs because light travels from medium to another
in the same direction
with the same intensity
with different velocities
obeying the laws of reflection
Answer: C
7.
The energy possessed by a student on top of a building is
chemical energy
heat energy
kinetic energy
potential energy
Answer: D
8.
A molar solution of KHSO4 contains
80g 0f KHSO4 in 1dm3 of solution
100g of KHSO4 in 100cm3 of solution
120g of KHSO4 in 100cm3 of solution
126g of KHSO4 in 1dm3 of solution
Answer: D
9.
The purpose of a seat belt in a vehicle is to
enable the user jump to safety during accident
prevent speeding by the driver
enable the driver negotiate bends at high speed without causing accident
prevent the user from being thrown forward on a sudden stop
Answer: D
10.
Which of the following food chain is correct
Grass frog ----> grasshopper ----->hawk
Hawk ----> grass ----> grasshopper ---> frog
Grass ----> grasshopper ----> frog ----> hawk
Grasshopper ----> grass ----> frog ----> hawk
Answer: C
11.
Which of the following substances is hazardous?
CO
CO2
Ne
He
Answer: A
12.
In a simple machine, the force that overcomes the resistance is
effort
effort
load
pivot
Answer: A
13.
A property of a material that makes it a good conductor of heat is its
colour
length
nature
volume
Answer: C
14.
Which of the following instruments is most suitable for measuring the thickness of razor blade?
Metre rule
Micrometer screw gauge
Vernier callipers
Surveyor's tape
Answer: B
15.
The main reason for trimming the side of a vegetable bed is to control
run-off water
leaching of nutrient
breaking of bed
soil erosion
Answer: A
16.
A ball and socket joint in the human body does not allow circular
circular movement
side to side movement
up and down movement
gliding movement
Answer: D
17.
The hair on the skin of pig is known as
bristle
brush
feather
fur
Answer: A
18.
The aim of the ring experiment in the a flowering plant is to demonstrate that
water is transported by the phloem
food substances are transported by the phloem
food substances are formed in the stem
water is excreted from the stem
Answer: B
19.
Alkanoic acid contain
carbon atoms and hydrogen atoms only
carbon atom and oxygen atoms only
carbon atoms, hydrogen atom and oxygen atoms only
carbon atoms, hydrogen atoms and nitrogen atoms only
Answer: C
Alkanols are alkane-derived organic compounds that have an alcohol (-OH) functional group bonded to them. An alkane is an organic compound that is composed only of carbon and hydrogen atoms.
Alkanols can vary in complexity, but some examples include ethanol, propanol, butanol, and pentanol. These compounds differ from each other only in the number of carbon atoms they contain. Ethanol contains two carbons, propanol three, butanol four, and pentanol five
Alkanoic Acids
Alkanoic acids are alkane-derived organic compounds that contain the carboxylate (-COOH) functional group
Examples include ethanoic acid, propanoic acid, butanoic acid and pentanoic acid
20.
Which of the following processes increase on a hot day?
digestion
egestion
sweating
respiration
Answer: C
21.
In cattle, anaemia, damaged skin and heart-water disease are caused by...
liver-fluke
roundworm
tapeworm
tick
Answer: D
22.
Release of dust into the atmosphere
I. cuts down photosynthesis.
II. cause respiratory disease.
III. reduces visibility
Which of the following above is/are correct?
I only
I and II only
I and III only
I,II and III
Answer: D
23.
Farmers prefer to grow crops on loamy soils because loamy soils
I. usually contains large amountof plant nutrient
II. protect the crops from injury
III. have equal amounts of clay and sand
IV. hold plants firmly
Which of the statements above is/are correct?
I only
I and II only
I and III only
I and IV only
Answer: A
24.
A balloon inflated with hydrogen gas will rise in the air because
it is weightless
there is no upthrust on it
the upthrust on it is more than its weight
the air will carry it upward
Answer: C
25.
The amount of light entering the human eye is regulated by the...
cornea
lens
pupil
retina
Answer: C
26.
Which of the following nutrients is not needed by crops in large quantity?
calcium
iron
nitrogen
phosphorus
Answer: B
27.
Which of the following substances would have a pH below 7?
Pure water
Milk of magnesia
Wood ash
Lemon juice
Answer: D
28.
The atomic number of an atomic number of an atom 15 and its mass number is 32.Determine the number of neutrons in the atom.
15
17
32
47
Answer: B
29.
Which of the following features are associated with dairy cattle? They
I. are lean with fairly long legs.
II. have well - shaped body conformation.
III. have well - develop udder.
IV. are generally humped.
I and II only
II and III only
I,II and III only
II,III and IV only
Answer: C
30.
In flies, the allele for grey body colour is dominant and black body is recessive.Two grey-bodies flies mated and they produced 75 grey-bodies flies and 25 black-bodies flies. The cross described is most likely to be
GG x GG
GG x Gg
Gg x GG
Gg x Gg
Answer: D
31.
Which of the following element is constituent of brass?
Iron
Magnesium
Tin
Zinc
Answer: D
An alloy is a substance made by melting two or more elements together, at least one of them metal.
Examples
Steel: the name given to an alloy of iron with carbon, usually with other elements, such as nickel and cobalt. The other elements add a desired quality to the steel, such as hardness or tensile strength.
Stainless Steel: another iron alloy, which typically contains chromium, nickel, and other elements to resist rust or corrosion.
Pewter: an alloy of tin, with other elements such as copper, lead, or antimony. The alloy is malleable, yet stronger than pure tin, plus it resists the phase change of tin that can make it crumble at low temperatures.
Brass: a mixture of copper with zinc and sometimes other elements. Brass is hard and durable, making it suitable for plumbing fixtures and machined parts.
Sterling Silver: is 92.5% silver with copper and other metals. Alloying silver makes it harder and more durable, although the copper tends to lead to greenish-black oxidation (tarnish).
Electrum: Some alloys, like electrum, occur naturally. This alloy of silver and gold was highly prized by ancient man.
Meteoritic Iron: While meteorites may consist of any number of materials, some are natural alloys of iron and nickel, with extraterrestrial origins. These alloys were used by ancient cultures to make weapons and tools.
Amalgams: These are mercury alloys. The mercury makes the alloy much like a paste. Amalgams may be used in dental fillings, with the mercury intact, although another use is to spread the amalgam and then heat it to vaporize the mercury, leaving a coating of another metal.
32.
Which of the following crops is not a root vegetable?
Carrot
Ginger
Lettuce
Onion
Answer: C
33.
An advantage of the use of hay over silage is that hay
ensure the availability of feed all year.
has laxative effect.
has higher proportion of leaves, water and nutrients.
is more palatable to livestock
Answer: A
34.
Pruning is a cultural practice undertaken in vegetable production to
provide shade and protection
remove diseased branches and leaves from plant
prevent plants from falling
prevent exposure of plants to rain, wind and sun
Answer: B
35.
Which of the following properties is associated with ionic compound?
are soluble in organic solvent
conduct electricity in the molten state
have low melting and boiling point
consists of molecules
Answer: B
36.
Soap may itch the skin when it contains excess
acid
alkali
fat
glycerol
Answer: B
37.
Rainbow formation is a practical illustration of the light phenomenon known as
dispersion
interference
mirage
reflection
Answer: A
38.
The final stage of the purification of water for town supply is
addition of chlorine
flocculation
aeration
sedimentation
Answer: A
39.
Drug addiction is a brain disease because it
is chronic and relapsing
is harmful and result in compulsive drug use
results in the structural change of the brain of the use
makes the brain more sensitive to drugs
Answer: A
40.
The best way of harvesting hot pepper is by
shaking the plant
handpicking the fruits
allowing the fruits to drop naturally
cutting the fruit with a sharp knife
Answer: D
41.
The unit of electric charge is
Answer: B
42.
The gas in the atmosphere that absorbs ultra violet rays is
carbon(IV) oxide
nitrogen
oxygen
ozone
Answer: D
43.
Yam is classified as a
Cereal
legume
root tuber
stem tuber
Answer: C
44.
Which of the flowering reactions can produce salt and water only?
Na3(aq)+ CH3C00H(aq)
NaOH(aq) + NH3(aq)
NH3(aq) + H2O(l)
NaCl(aq) + AgNO3(aq)
Answer: A
45.
The image formed by a plane mirror is
magnified.
real.
laterally inverted.
diminished.
Answer: C
46.
Which of the following chemical is toxic ?
Potassium cyanide
Sodium hydroxide
Hydrogen peroxide
Calcium oxide
Answer: A
Potassium cyanide
Potassium cyanide is a highly poisonous compound that is an inhibitor of many metabolic processes.
It is used for gold and silver extraction, in chemical analysis, to make other chemicals, and as an insecticide.
Sodium hydroxide
Also known as lye and caustic soda is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na+
and hydroxide anions OH−.
Sodium hydroxide is used in many industries: in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents, and as a drain cleaner
Hydrogen peroxide
A chemical compound with the formula H2O2. In its pure form, it is a pale blue, clear liquid, slightly more viscous than water
It is used as an oxidizer, bleaching agent and antiseptic
Calcium oxide
Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature.
Used in large quantities as building and engineering materials (including limestone products, cement, concrete, and mortar), as chemical feedstock, and for sugar refining.
47.
The fundamental units which combine to give the unite of force are
kilograme, second and ampere
metre, ampere and second
kilograme, metre and second
metre, kelvin and second
Answer: C
48.
In which of the following blood vessel is the pressure highest
Hepatic artery
Renal artery
Dorsal aorta
Vena cava
Answer: C
49.
An advantage in the use of hard water is
furing of kettle.
blockage of water pipes.
formation of scum.
formation of strong bone
Answer: D
50.
Which of the following mineral is not needed by crop in large quantities ?
Calcium
Iron
Nitrogen
Phosphorus
Answer: B
Crops obtain most of their carbon and oxygen from the air. Hydrogen is obtained from soil water. Carbon dioxide is especially important for plant growth. It is taken up by the plant from air through pores in the green leaves and combines with hydrogen from soil water, to form carbohydrate and other plant substances by energy from sunlight by the process of photosynthesis
Out of the 13 nutrients taken from the soil, Nitrogen, Phosphorus and Potassium are used in large quantities and hence known as primary nutrients.
Calcium, Magnesium and Sulphur are needed in moderate to small quantities but they play an important role in formation of plant tissues. These are known as secondary nutrients
The remaining are needed in very small quantities and are known as micro-nutrients. Plants need 16 elements to grow. They get these from air, water and soil.
Type | Nutrients | Source |
Macro-nutrient | Carbon | Air & Water |
Macro-nutrient | Hydrogen | Air & Water |
Macro-nutrient | Oxygen | Air & Water |
Macro-nutrient | Nitrogen | Soil |
Macro-nutrient | Phosphorus | Soil |
Macro-nutrient | Potassium | Soil |
Micro-nutrient | Calcium | Skeleton Elements |
Micro-nutrient | Magnesium | Fertilizers and Manures |
Micro-nutrient | Sulphur | Fertilizers and Manures |
Micro-nutrient | Iron | Fertilizers and Manures |
Micro-nutrient | Manganese | Fertilizers and Manures |
Micro-nutrient | Boron | Fertilizers and Manures |
Micro-nutrient | Zinc | Fertilizers and Manures |
Micro-nutrient | Copper | Fertilizers and Manures |
Micro-nutrient | Molybdenum | Fertilizers and Manures |
Micro-nutrient | Chlorine | Fertilizers and Manures |
(a) An electrical appliance rated 1.5kW, 240V is left running for hours. Calculate the
(i) current drawn;
(ii) electrical energy consumed.
(b) (i) In what two ways does mulching help to conserve the soil?
(ii) Give two examples of mulching materials.
(c) (i) What is pollution?
(ii) List three major atmospheric pollutants.
(d) (i) State two benefits of each of the following minerals to the human body:
(α) potassium;
(β) calcium.
(ii) Name one source of each of the minerals listed in(d)(i).
(a) (i) State the method of preparing a salt from each of the following pairs of substances:
(α) dilute tetraoxosulphate(VI) acid and dilute sodium hydroxide;
(β) lead(II) trioxonitrate(V) and sodium chloride.
(ii) Write a balance equation for the reaction between lead(II) trioxonitrate(V) and sodium chloride.
(b) (i) What are tidal waves?
(ii) State four ways in which water could be contaminated.
(c) (i) State two ways in which legumes are important in crop production.
(ii) State three advantages of crop rotation.
(d) (i) State three qualities of a good thermometric liquid;
(ii) Give two precautions that must be taken when using a liquid-in-gas thermometer.
(a) (i) Give three reasons why goats are not normally kept under the intensive system of management.
(ii) Name two diseases that affect rabbits.
(b) (i) Draw the structure of 11Na+.
(ii) State two differences between organic compound and inorganic compounds.
(c) (i) What are decomposer?
(ii) Name three common decomposers in an ecosystem.
(d) (i) Name three structures in the middle ear that help in the transmission of sound waves;
(ii) Mention two ways in which earmuffs are important.
(a) (i) Define each of the following terms:
(α) compound;
(β) mixture.
(ii) State two differences between an element and a compound.
(b) Explain each of the following terms:
(i) greenhouse effect;
(ii) climate change.
(c)(i) What is electrical rectification?
(ii) Using simple wave diagram, explain half-wave rectification.
(d) State one way in which each of the following environmental factors is important to the life cycle of crops:
(i) rainfall;
(ii) temperature;
(iii) sunshine;
(iv) wind.
In an experiment to investigate the effect of sugar solution on onion tissues, pieces of epidermal tissues of equal sizes were peeled from inner fleshy leaves of onions. A number of the tissues were placed in six test tubes containing sugar solutions of different concentration. After a few hours the cells of the tissues were observed to be deformed. The percentage of the deformed cells in the various solutions are presented in Table 1 below.
Study the diagram carefully and answer the questions that follow.
(a) Plot a graph of percentage of deformed cells on vertical axis and concentration of sugar solution on the horizontal axis.
(b)Draw and label a diagram to show the appearance of the onion cell in the
(i) 0.5% concentrated solution;
(ii) 2.5% concentrated solution.
(c) Give one reason each for the appearance of the cells draw in (b).
(d)State two environmental factors that could have the same effect on a plant as the concentrated sugar solution.