KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Which of the following activities are cultural practices in the cultivation of cabbage?
I. Prunning
II. Weeding
III. Watering
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III only
Answer: D
2.
The efficiency of a machine is usually less than one due to
A.
friction
B.
greasing
C.
heat
D.
the load used
E.
the effort applied
Answer: A
3.
The shape of a child’s nose may resemble that of the mother due to
A.
heredity
B.
similarity
C.
reflection
D.
familiarity
E.
attraction
Answer: A
4.
Which of the following is not true about frictional force? It
A.
increases motion
B.
opposes motion
C.
damages machines
D.
produces heat
E.
decreases efficiency of machines
Answer: A
5.
Boiling and chlorination are used in water purification to
A.
kill germs.
B.
help suspended particles to settle.
C.
remove suspended particles.
D.
remove hardness of the water.
Answer: A
6.
The mode of heat transfer in which no material is involved is known as
A.
conduction
B.
convection
C.
expansion
D.
radiation
Answer: D
Radiation is the process in which heat is transmitted one place to other directly without intervening medium. We get radiation of sun without an intervening medium
7.
Which of the following crops is propagated vegetatively?
A.
Cassava
B.
Coconut
C.
Mango
D.
Okro
E.
Tomato
Answer: A
8.
Soil texture is a term used to describe the
A.
amount of water soil can hold.
B.
arrangement of soil particles in a given soil.
C.
properties of soil, silt and clay in a sample of soil.
D.
mixture of all soil particles.
Answer: C
Soil texture (such as loam, sandy loam or clay) refers to the proportion of sand, silt and clay sized particles that make up the mineral fraction of the soil.
9.
Energy is measured in
A.
Kelvin
B.
Joules
C.
Watts
D.
Metres
E.
Amperes
Answer: B
10.
In an experiment to determine the various particle sizes of soil sedimentation, the particle above clay suspension are
A.
Loam
B.
Organic
C.
Gravels
D.
Silt
Answer: B
11.
Fishponds are often stocked using
A.
anchovies.
B.
fingerlings.
C.
fish eggs.
D.
frys.
Answer: B
12.
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
Answer: A
Clay soil is smooth when dry and sticky when wet
13.
The process used in getting salt from sea water is
A.
boiling
B.
condensation
C.
decantation
D.
sedimentation
E.
evaporation
Answer: E
14.
Which of the following energy transformations takes place at a hydroelectric power station?
A.
Potential energy → kinetic energy → electrical energy
B.
Potential energy → sound energy → electrical energy
C.
Kinetic energy → sound energy → electrical energy
D.
Electrical energy → light energy → heat energy
Answer: A
15.
One characteristics which is not common to all living things is the ability to
A.
grow.
B.
move about.
C.
respire.
D.
respond to stimuli.
Answer: B
16.
The structure which enables a fish to breate in water is
A.
buccal cavity
B.
gills
C.
swim bladder
D.
lungs
Answer: B
Fish gills are organs that allow fish to breathe underwater. Most fish exchange gases like oxygen and carbon dioxide using gills that are protected under gill covers on both sides of the pharynx. Gills are tissues that are like short threads, protein structures called filaments
17.
The process whereby soil is formed by the breakdown of rocks is called
A.
composting.
B.
erosion.
C.
leaching.
D.
weathering.
Answer: D
18.
Which of the following sources of energy is non-renewable?
A.
Sun
B.
Waves
C.
Wind
D.
Wood
Answer: D
Renewable energy is energy derived from natural sources that are replenished at a higher rate than they are consumed. Sunlight and wind, for example, are such sources that are constantly being replenished.
19.
The systematic name for N2O is
A.
Nitrogen (I) oxide
B.
Nitrogen (II) oxide
C.
Nitrogen (III) oxide
D.
Nitrogen (IV) oxide
Answer: A
20.
The organelle which occupies the largest portion of a plant cell is the
A.
chloroplast.
B.
mitochondrion.
C.
nucleus.
D.
vacuole.
Answer: D
21.
Which of the following forces will cause an object to move in a circular path?
A.
Centripetal force
B.
Gravitational force
C.
Inertial force
D.
Reaction force
E.
Tensional force
Answer: A
22.
An example of a simple lever whose effort is at its centre is
A.
a bottle opener
B.
a pair of scissors
C.
a pair of forceps
D.
the beam balance
E.
wheelbarrow
Answer: C
23.
The excretory organs in man are the
A.
Kidneys and urethra
B.
Kidneys and the skin
C.
Kidneys, lungs and the skin
D.
Kidneys and the lungs
E.
Kidneys, bladder and urethra
Answer: C
24.
The basic unit of matter is the
A.
atom.
B.
compound.
C.
element.
D.
electron.
E.
ion.
Answer: A
An atom is defined as the smallest unit of matter indivisible by chemical means.
25.
Which of the following gives the correct order by which blood circulates continuously through the circulatory system?
A.
Heart → veins → organs → arteries → heart
B.
Heart → arteries → organs → veins → heart
C.
Heart → arteries → veins → organs → heart
D.
Heart → organs → arteries → veins → heart
E.
Heart → veins → arteries → organs → heart
Answer: B
26.
The characteristics of a fertile soil include good
I. aeration,
II. texture,
III. water-holding capacity.
A.
I only
B.
I and II only
C.
II and III only
D.
I, II and III
Answer: D
27.
Each layer of soil profile is known as
A.
horizon.
B.
litter.
C.
regolith.
D.
solum.
Answer: A
28.
The form of energy produced from the nucleus of an atom is termed
A.
chemical energy
B.
mechanical energy
C.
nuclear energy
D.
thermal energy
Answer: C
29.
The second stage in the life cycle of a mosquito is the
A.
egg.
B.
imago.
C.
larva.
D.
pupa.
Answer: C
30.
The type of teeth used for biting and cutting are the
A.
canines.
B.
incisors.
C.
molars.
D.
premolars.
Answer: B
Incisors
Incisors are the four front teeth in the centre of each jaw. Their cutting edges are broad and sharp like chisel. They are used for biting and cutting.
31.
The eclipse formed when the moon comes between the sun and the earth is known as
A.
annular eclipse
B.
lunar eclipse
C.
solar eclipse
D.
total eclipse
Answer: C
32.
Which of the following characteristics applies to only plants?
A.
Excretion of waste materials
B.
Response to stimuli
C.
Ability to manufacture food from simple substances
D.
Ability to respire
Answer: C
33.
Which of the following is the organic part of the soil?
A.
Mineral salts
B.
Water
C.
Rock particles
D.
Air
E.
Humus
Answer: E
34.
Which of the following substances is acidic?
A.
Wood ash
B.
Salt-petre
C.
Bee strings
D.
Bicarbonate of soda
Answer: C
35.
Which of the following statements about the base of a transistor are correct? The base is
I. made very thin
II. made very wide
III. responsible for activating the transistor
IV. made of n-type semiconductor
A.
I and III only
B.
II and IV only
C.
I, III and IV only
D.
II, III and IV only
Answer: A
36.
The best way to prevent guinea worm disease is by
A.
boiling drinking water.
B.
putting camphor in drinking water.
C.
putting drinking water in a refrigerator.
D.
sieving drinking water.
Answer: A
Dracunculiasis is an infection caused by a parasite called the Guinea worm. A person becomes infected when they drink contaminated water.
Usually the disease has no initial symptoms. About one year later, there is a painful burning feeling as a blister forms, usually on the legs. The blister bursts as the worm then comes out of the skin over a few weeks.
The worm can be pulled out a few centimetres each day. The process usually takes weeks.
37.
The work done when a weight of 40 N is lifted up vertically through a distance of 10 m is
A.
400 J
B.
50 J
C.
30 J
D.
4 J
E.
0.25 J
Answer: A
Work done = Force x Distance
Force = 40 N
Distance = 10 m
Work done = 40 N x 10 m = 400 J
38.
The diagram below shows a lever system used to move a stone. Use it to answer the question below
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.
Answer: B
Mechanical Advantage =
Load Distance: is the distance between the pivot (fulcrum) and the load
Effort Distance: Is the distance between the pivot (fulcrum) and the effort
Since the effort distance (Y) is the numerator in the mechanical advantage formula, the greater it is than the load distance (X), the greater the mechanical advantage and the better the efficiency of the machine/lever.
39.
Which of the following chemical equations is balanced?
A.
N2+H2→NH3
B.
N2+3H2→NH3
C.
N2+H2→2NH3
D.
N2+3H2→2NH3
Answer: D
40.
A bar magnet attracts all the following objects except
A.
pins
B.
pair of scissors
C.
nails
D.
razor blade
E.
glass
Answer: E
THEORY QUESTIONS
1.
(a)
(i)
Name two elements which make the teeth of mammals strong.
(ii)
Name two common diseases of the human teeth.
(b)
State three reasons why sandy soil cannot support effective plant growth.
(c)
An atom has 13 protons and 14 neutrons:
(i)
draw and label the structure of the atom.
(ii)
State its valency.
(d)
(i)
State three ways in which fluid pressure is applied in everyday activities.
(ii)
State one substance that is an insulator.
(a)
(i)
Elements that make the teeth strong
1. Calcium
2. Flourine
3. Phosphorus
(ii)
Common diseases of the human teeth
1. Dental caries/cavity/tooth decay
2. Gum disease/gingivitis/periodontal disease
3. Cancer
4. Plague
(b)
Reasons why sandy soil cannot support effective plant growth
1. Cannot hold enough water/easy for water to filter out
2. Easily eroded
3. Heats up easily/ dries out easily
4. Poor in nutrient content/less fertile
5. Succeptible to leaching
(c)
(i)
(ii)
Valency = 3 (three)
(d)
(i)
Ways in which fluid pressure is applied in everyday activities
1. Water pumps
2. Car brakes
3. Drinking straw
4. Pumping tyre
5. Syringes
6. Siphon
7. Enema
(ii)
Substances that are an insulators
1.Dry wood
2. Air
3. Rubber
4. Plastic
5. Glass
6. Cloth
2.
(a)
(i)
Give the names of organisms which cause the following diseases:
Sleeping sickness, Cholera, Malaria, Bilharzia
(ii)
Which part of the following crops does a farmer usually grow?
Banana, cocoyam, tomato, ginger, yam, cassava
(b)
Name the organs used by the following organisms for respiration:
(i)
Tilapia
(ii)
Toad
(c)
(i)
What happens to the temperature of water that is boiling in an open container?
(ii)
Give two characteristics of a liquid.
(iii)
Name the three processes by which heat is transmitted.
(iv)
State two applications of the expansion of solids in everyday life.
(d)
Explain the following terms:
(i)
Physical change
(ii)
Chemical change
(e)
State whether each of the following is a physical or a chemical change
(i)
rusting of iron
(ii)
freezing of water
(iii)
burning of wood
(iv)
fermentation
(v)
grinding of chalk
(vi)
dissolving sugar in water
(f)
Name the compound formed when theh following elements combine:
(i)
Iron and sulphur
(ii)
Zinc and oxygen
(iii)
Sodium and chlorine
(iv)
Calcium and chlorine
(a)
(i)
| Disease | Organism |
| Sleeping sickness | Trypanosome/Trypanosoma |
| Cholera | Vibrio cholerae |
| Malaria | Plasmodium |
| Biharzia | Blood fluke/Schistosoma/Schistosome |
(ii)
| Crop | Part grown |
| Banana | Sucker |
| Cocoyam | Corm/underground stem |
| Tomato | Seed |
| Ginger | Rhizome/underground stem |
| Yam | Tuber/stem tuber/underground stem |
| Cassava | Stem cutting/cassava sticks |
(b)
Organs for respiration:
(i)
Tilapia → Gills
(ii)
Toad → Lungs or skin or mouth
(c)
(i)
The temperature remains the same/unchanged/constant
(ii)
Characteristics of a liquid
1. Has no definite shape/takes the shape of container
2. Has volume/occupies space
3. Molecules/particles are not in fixed positions
4. Molecules move about randomly
5. Not compressible
(iii)
1. Conduction
2. Convection
3. Radiation
(iv)
Applications of the expansion of solids in everyday life
1. Railway line gaps
2. Rollers in metal bridges
3. Thermostat
4. Concrete slabs
5. Riveting
6. Fixing wheels
(d)
(i)
Physical change is a change in which no new substance is formed
OR
Physical change is a change in which no new substances are formed
OR
Physical change is a change in which substances retain their individual properties.
(ii)
Chemical change is a change in which a new substance is formed
OR
Chemical change is a change in which new substances are formed
OR
Chemical change is a change in which new substances formed have entirely different properties from their constituents.
(e)
| Physical change | Chemical change |
| Freezing of water | Rusting of iron |
| Grinding of chalk | Burning of wood |
| Dissolving sugar in water | Fermentation |
(f)
(i)
Iron and sulphur → Iron sulphide/Iron (II) sulphide/Iron (III) sulphide
(ii)
Zinc and oxygen → Zinc oxide
(iii)
Sodium and chlorine → Sodium chloride
(iv)
Calcium and chlorine → Calcium chloride
3.
a)
i)
What is a simple machine?
ii)
Give two examples of a simple machine?
b)
i)
What is rusting?
ii)
State two effects of rusting.
c)
i)
What are food nutrients?
ii)
Classify the following food items as carbohydrate, fats and oil or protein:
Beans, palm fruits, meat, margarine, bread and maize.
d)
i)
State two effects of malnutrition in farm animals.
ii)
Mention one disease of farm animals caused by virus.
a)
i)
Simple machine is a device that makes work easier/faster.
OR
Simple machine a device which enables a small force (effort) to overcome a large force (load).
ii)
Examples of a simple machine
1. Lever (Examples are a crowbar, claw hammer, a pair of pliers)
2. Wheel and axle (Examples are the steering wheel of a car, bicycle pedal)
3. Pulley (Examples are a pulley used in raising a load)
4. The inclined plane (Examples are ramps, staircases, hilly roads)
5. The wedge (Examples are knife, axe, plough)
6. Screw (Examples are A screw bolt)
b)
i)
Rusting is the reaction of iron or iron containing substances with water/moisture and air/oxygen to form an oxide of iron.
ii)
Effects of rusting
1. It causes iron to lose its strength/structure resulting in accident
2. It can cause collapse of building and bridges resulting in maintenance cost
3. It causes iron to lose its lustre
c)
i)
Food nutrients are substances which when taken in by living things help in performing of life activities
OR
Food nutrients are essential materials/substances present in food which when taken in by living things help in performing of life activities
ii)
Carbohydrate → Bread, maize
Fats and oil → Palm fruits, margarine
Protein → Beans, meat
d)
i)
Effects of malnutrition in farm animals
1. Loss of weight/stunted growth
2. General body weakness
3. Reduced activity
4. Dullness
5. Less resistant to diseases
6. Reduced reproduction
7. Poor formation of bones
ii)
Viral diseases of farm animals
1. Rinder-pest
2. Newcastle
3. Gumboro
4. Fowl pox
5. Cow pox
6. Marek's disease
7. Swine fever
8. Bird flu
9. Foot and mouth disease
4.
(a)
Define the following processes:
(i)
Excretion
(ii)
Respiration
(iii)
Name one organ in man which is responsible for each of the processes in (a) (i) and (ii) above
(b)
Mention three ways of protecting people from infection during an outbreak of cholera.
(c)
Write down the chemical names of the following compounds.
(i)
MgCl2
(ii)
FeS
(iii)
CuSO4
(iv)
NH4OH
(d)
List the names of the planets in order of their distances away from the sun; starting with the one nearest to it.
(a)
(i)
Excretion is the process of removing metabolic waste/substances from the body of a living organism.
(ii)
Respiration is the process whereby oxygen is used in living cells to breakdown food leading to the release of energy.
OR
Respiration involves the taking in of oxygen and giving out of carbon dioxide.
OR
Respiration is the breakdown of food to release energy.
(iii)
Excretion → skin, kidney, lung, liver
Respiration → Lungs
(b)
Ways of protecting people from infection during an outbreak of cholera
1. Vaccination
2. Isolation of infected persons
3. Maintaining good sanitary conditions
(c)
Chemical names of compounds
(i)
MgCl2 → Magnesium chloride
(ii)
FeS → Iron (II) sulphide
(iii)
CuSO4 → Copper (II) sulphate/Copper (II) tetraoxosulphate (VI)
(iv)
NH4OH → Ammonium hydroxide
(d)
List of planets of the solar system in the order they occur starting with the planet nearest the sun
1. Mercury
2. Venus
3. Earth
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune
9. Pluto
Note: you can use the below mnemonics to remember the nine planets.
My (Mercury) Very (Venus) Eyes (Earth) May (Mars) Just (Jupiter) See (Saturn) Under (Uranus) Nine (Neptune) Planets (Pluto)
5.
(a)
The diagrams below are illustrations of a set-up used to study the conditions for seed germination. The flasks are kept at 25 oC during the experiment. Study the diagrams carefully and answer the questions that follow.
(i)
What conclusion can be drawn from the results of flask 1 and flask 2?
(ii)
What conclusion can be drawn from the results of flask 2 and flask 3?
(iii)
The seedings in flask 2 died after two weeks. What can be the reasons for this occurrence?
(iv)
A candidate concluded that light was an important factor for the germination. Did the candidate make a correct conclusion?
(v)
Give a reason for the answer stated in (iv) and state which of the flasks in the experiment could be used to support your answer.
(b)
The diagram below are illustrations of an experimental set-up. Study the diagrams carefully and answer the questions that follow.
(i)
Name the measuring instrument that is in:
(α)
parallel;
(β)
series;
With the resistor R
(ii)
What quantity does each of the named instruments in (i) measure?
(iii)
Read and record the values as indicated on:
(α)
A in amperes;
(β)
V in volts.
(iv)
Use the values read in (iii) to calculate the value of R.
(v)
State one precaution to be taken in performing this experiment.
(c)
The diagrams below are illustrations of soil.Study the illustrations carefully and answer the questions that follow.
(i)
Identify each of the soil types labelled A, B and C
(ii)
Describe each of the soils under the following properties:
(α)
Particle size
(β)
Air space
(iii)
State two ways of improving soil type B for vegetable cultivation.
(d)
The diagrams below is a set-up for preparation of common salt in the laboratory. Study the diagrams carefully and answer the questions that follow.
(i)
Name each of the parts labelled IV, V and VI.
(ii)
Name two possible solutions that can react to product salt.
(iii)
Name the process that takes place when the two solution named in (ii) react.
(iv)
Name the process that takes place in the set-up B.
(v)
Write a balanced chemical equation for the reaction between the two solutions named in (ii).
(a)
(i)
Light is not necessary for germination
(ii)
Water is necessary for germination
(iii)
1. Lack of water/moisture
2. The food stored in the seed is used up/the seedlings cannot carry out photosynthesis/no sunlight
(iv)
No, light is not an important factor for germination
(v)
1. Because light is not necessary for the germination of seed.
2. The seed in flask 2 germinated even though the flask was lined with the aluminium foil
(b)
(i)
(α)
Voltmeter
(β)
Ammeter
(ii)
Voltmeter measures the potential difference/voltage and ammeter measures the current (electric)
(iii)
(α)
5 A
(β)
10 V
(iv)
Resistance = Voltage/Current = 10/5 = 2 Ω
(v)
Precautions
1. Voltmeter and ammeter must be of proper range/calibration
2. The key should be inserted only while taking readings
3. All the electrical connections must be tight
(c)
(i)
A = loamy soil/loam
B = sandy soil/sand
C = clayey soil/clay
(ii)
Description of soils
| Soil Type | Particle Size | Air space |
| A | Medium/large | Moderate |
| B | Large/medium | Large |
| C | Small | Small |
(iii)
Ways of improving sandy soil
1. Mulching the soil
2. Applying organic manure/compost/farm yard manure/fertilizer
3. Planting cover crops
(d)
(i)
IV = Evaporating dish
V = Retort/clamp stand
VI = Tripod stand
(ii)
Sodium hydroxide (NaOH) and hydrochloric acid (HCl)
(iii)
Neutralization
(iv)
Evaporation/boiling/heating
(v)
NaOH + HCl → NaCl + H20
6.
a)
i)
What is aerobic respiration?
ii)
State the main difference between aerobic respiration and anaerobic respiration.
b)
i)
Explain the term potential difference.
ii)
The potential difference across the terminals of a 100 Ω resistor is 250 V.
Calculate the current flowing through the resistor.
c)
i)
Which crop is infected by the Swollen Shoot disease?
ii)
State the causative organisms of the disease.
iii)
State the method of spread of the disease.
iv)
Give two ways of preventing the spread of the disease.
d)
Consider the given elements: 37 X and 920 Y
i)
Write the electronic configuration for Y;
ii)
State the possible ion that could be formed by X to make it more stable.
a)
i)
Aerobic respiration is the process of cellular respiration that takes place in the presence of oxygen gas to produce energy from food.
OR
Aerobic respiration is the breakdown/oxidation of organic food substance/glucose in the presence of oxygen to release large amount of energy, water and carbon dioxide as by-products.
ii)
Aerobic respiration requires oxygen while anaerobic respiration does not require oxygen.
OR
In aerobic respiration oxygen is used while in anaerobic respiration oxygen is not used.
b)
i)
Potential difference also known as voltage, is the external work needed to bring a charge from one location to another location in an electric field.
OR
Is the work done in moving a unit of positive electric charge from one point to another.
ii)
Potential Difference (V) = Current x Resistance
V = IR
Where V = potential difference, I = current and R = resistance
Potential difference = 250 V
Resistance = 100 Ω
250 = I x 100
Divide both sides by 100 to solve for I.
I = = 2.5 A
The current flowing through the resistor is 2.5 A
c)
i)
Cocoa
ii)
Causative organism of the swollen shoot disease
Virus/Cacoa swollen shoot virus
iii)
Method of spread of the swollen shoot disease
Virus transmitted by nymphs of mealy bugs from infected plant to healthy plants.
iv)
Ways of preventing the spread swollen shoot disease
1. Destroy infected trees
2. Regular inspection of seedlings/planting materials
3. Use of quarantine/cordin sanitaire (leaving 10m wide cocoa free zone around area
4. Barrier cropping
5. Using partly tolerant hybrids/using resistant varieties
6. Removing host free species
d)
37 X and 920 Y
i)
Electronic configuration for Y = 2:7
ii)
X+/L+
Note: The ion formed is cation. It can lose the one electron in its last shell to be make it more stable with only two electrons.