KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Oil from a mechanic workshop accidentally spilled into a pool of water which was breeding mosquitoes.
After sometime, the pool of water was no longer breeding mosquitoes.
Which control method may have been deployed?
A.
Biological control
B.
Chemical control
C.
Environmental control
D.
Genetic control
Answer: B
2.
The part of cocoyam which is used in propagation is the
A.
bulb
B.
corm
C.
seed
D.
sucker
E.
rhizome
Answer: B
3.
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
4.
Which of the following is not matter?
A.
Iced block
B.
Air
C.
Light
D.
Smoke
E.
Stone
Answer: C
5.
A screw is a machine which works in the same way as
A.
a lever.
B.
an incline plane.
C.
a wheel and axle.
D.
a pulley.
Answer: B
Screw
A screw is an inclined plane that is coiled around a shaft. They usually have one flat end and one pointed end.
6.
Which of the following methods is not a way of preventing malaria parasites from person to person?
A.
Sleeping in mosquito nets
B.
Sleeping outside in the open
C.
Draining all stagnant pools of water around our homes
D.
Taking anti-malaria drugs weekly
E.
Burying all empty cans that hold water in our surroundings
Answer: B
7.
The dissolution of sugar in water is a physical change because the sugar
A.
cannot be seen in water.
B.
cannot be separated from the water.
C.
can be separated from the water.
D.
can be tested in the water.
Answer: C
For a physical change, no new substance(s) are formed and the change is reversible. The sugar can be separated from the water by means of distillation and therefore reversible.
8.
The colour of a soil profile determines the
A.
depth at which implements are set
B.
drainage ability of the soil
C.
fertility of the soil
D.
type of tool to use
Answer: C
Color is an important physical property of soils that allows us to know some of its most important characteristics, such as mineral composition, age and soil processes, chemical alteration, carbon accumulation, the presence of hurrified organic matter. The soil may be black, red, yellow or coppered colored. From the color of the soil, we get an ideal of the fertility, drainage and other such properties.
9.
Desert plants shed their leaves to reduce the rate of
A.
absorption of minerals.
B.
diffusion.
C.
osmosis.
D.
respiration.
E.
transpiration.
Answer: E
Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism. The remaining 97–99.5% is lost by transpiration
10.
In which of the following is urine produced?
A.
Bladder
B.
Kidney
C.
Liver
D.
Penis and vagina
E.
uterus
Answer: B
11.
A substance which is made up of the same kind of atoms is called
A.
a compound.
B.
a mixture.
C.
an element.
D.
an ion.
Answer: C
12.
Which of the following explains why a wet cloth dries faster on a dry day than on a humid day?
A.
The rate of evaporation is very high during a dry day
B.
There is much water vapour in the atmosphere during a dry day
C.
It is very misty during a dry day
D.
there is no evaporation during a humid day
E.
The sun does not set during a humid day
Answer: A
13.
The fusion of an egg cell with sperm forms
A.
an ovum.
B.
an embryo.
C.
a zygote.
D.
an ovary.
E.
a placenta.
Answer: C
14.
A stone with mass 80.0 g was put into a measuring cylinder containing water. If the water level rises by 20.0 cm, calculate the density of the stone.
A.
0.25 g cm-3
B.
1.20 g cm-3
C.
1.80 g cm-3
D.
3.30 g cm-3
E.
4.00 g cm-3
Answer: E
Density =
Mass = 80.0 g
Volume = 20.0 cm3
Density =
Density = 4.0 g cm-3
15.
Which of the following particles can be found in the nucleus of an atom?
A.
Electrons and protons
B.
Electrons and shells
C.
Neutrons and electrons
D.
Neutrons and protons
E.
Shells and neutrons
Answer: D
16.
Which of the following organisms is prokaryotic?
A.
Bacteria
B.
Earthworm
C.
Fungus
D.
Plant
Answer: A
A prokaryotic organism is a single-celled life form that lacks a nucleus and other membrane-bound organelles. Prokaryotes are typically found in the domains Bacteria and Archaea. They are characterized by their relatively simple structure and the absence of internal membranes that define eukaryotic cells.
17.
The part of the flower that contains nectar is called
A.
anther.
B.
petal.
C.
ovary.
D.
sepal.
Answer: A
18.
The process by which a naphthalene ball (camphor) placed in a box gets smaller in size is termed
A.
Melting
B.
Diffusion
C.
Evaporation
D.
Sublimation
E.
Condensation
Answer: D
Sublimation is the conversion of a substance from the solid to the gaseous state without its becoming liquid.
19.
Which of the following substances breaks down fats into tiny droplets during digestion?
A.
Bile
B.
Gastric juice
C.
Pancreatic juice
D.
Saliva
Answer: A
20.
The main parts of the central nervous system are the
A.
brain and nerves
B.
spinal cord and the nerves
C.
brain and the spinal cord
D.
brain, the nerves and the spinal cord
E.
brain, the eyes, the ears and the nerves
Answer: C
21.
Which of the following gases is involved in the rusting of iron?
A.
Hydrogen
B.
Oxygen
C.
Nitrogen
D.
Carbon dioxide
Answer: B
22.
Which of the following living things hide during the sunny days in order to conserve water in its body?
A.
Rat
B.
Lizard
C.
Butterfly
D.
Toad
E.
Bat
Answer: D
23.
The type of cloud that gives rain is
A.
cumulus.
B.
cirrus.
C.
nimbus.
D.
stratus.
Answer: D
24.
All the following plants reproduce sexually except
A.
coconut
B.
sweet potato
C.
pawpaw
D.
apple
E.
pear
Answer: B
25.
Which of the following electrical appliances can convert electrical energy to heat energy?
I. Electric iron
II. Kettle
III. Water heater
A.
I, II and III
B.
I and III only
C.
II and III only
D.
I and II only
Answer: A
26.
An example of a storage pest is
A.
yam beetle.
B.
capsid.
C.
army worm.
D.
weevil.
Answer: D
A storage pest is an insect or other animal that damages or destroys stored food or other stored valuable organic matter.
Grain borers, weevils and Angoumois grain moths are able to feed on whole, healthy grains, they are considered storage pests
27.
In which part of the digestive system of a fowl does grinding of feed take place?
A.
Crop
B.
Gizzard
C.
Oesophagus
D.
Proventriculus
Answer: B
28.
Regular brushing of teeth is primarily done in order to
A.
keep the mouth fresh
B.
clear away food particles from the teeth
C.
remove bad smell in the mouth
D.
kill bacteria in the mouth
E.
control the flow of saliva
Answer: B
29.
The best method for checking erosion on a slope is
A.
cover cropping.
B.
mixed cropping.
C.
contour ploughing.
D.
mulching.
Answer: C
30.
Gases are more compressible than solids because:
A.
Solids have harder surfaces
B.
There are wider spaces between gas molecules
C.
Gases have fixed volumes
D.
The particles of solids are regularly arranged
E.
The molecules of gases are randomly arranged
Answer: B
31.
The knowledge of soil texture is important because it
A.
influence plant population.
B.
determines the planting distance.
C.
determines the type of plant to be grown.
D.
influence the method of pest control.
Answer: C
32.
The joule is the S.I unit for
A.
energy.
B.
force.
C.
power.
D.
pressure
Answer: A
33.
The following are steps involved in how nutrients in decaying organic matter finally get to man.
I. The mineral in them go into the soil
II. Man goes to eat the plant food
III. They dissolve in soil water
IV. They are used up by plants during photosynthesis
Which of the following arrangements represents the correct order in which the processes occur?
A.
I, II, III and IV
B.
I, III, IV and II
C.
IV, II, III and I
D.
II, III, I and IV
E.
III, IV, I and II
Answer: B
34.
An unripe orange is said to be acidic because it
A.
has low sugar content.
B.
has bitter taste.
C.
turns red litmus paper blue.
D.
turns blue litmus paper red.
Answer: D
Acid turns blue litmus paper red. You can use the acronym BAR to remember which stands for Blue Acid Red where B stands for Blue litmus paper and A stands for Acid and R stands for Red.
Once you know that of the acid when you remember BAR, you can reverse it for the base. For a base or alkaline, red litmus paper turns blue.
35.
Which of the following is a structure in the ear?
A.
Cornea
B.
Cochlea
C.
Iris
D.
Retina
E.
Trachea
Answer: B
36.
Which of the following substances can exist in all the three states of matter at 0°C?
A.
Petrol
B.
Palm oil
C.
Milk
D.
Alcohol
E.
Water
Answer: E
37.
On the moon, there are large holes called
A.
valleys
B.
gullies
C.
spurs
D.
craters
E.
pits
Answer: D
38.
A boy stepped on a banana peel on the ground and fell because the
A.
boy was not wearing shoes.
B.
ground was too hard.
C.
banana peel reduced the friction on the ground.
D.
banana peel increasethe friction on the ground.
Answer: C
Friction is the force that resists motion when the surface of one object comes in contact with the surface of another.
39.
Which of the following farming practices is the best way of maintaining soil fertility?
A.
Crop rotation
B.
Seasonal cropping
C.
Constant ploughing
D.
Bush burning
E.
Mono cropping
Answer: A
40.
The testes are normally located outside the body of the male because
A.
the temperature of the body is too high for effective sperm production.
B.
they cannot increase in size when it is in the body.
C.
they can absorb moisture from the atmosphere.
D.
they occupies too much space.
Answer: A
THEORY QUESTIONS
1.
(a)
Mention five differences between plants and animals.
(b)
Define each of the following terms, giving one example in each case:
(i)
Compound;
(ii)
Element.
(c)
(i)
Give two differences between an electrical insulator and a conductor.
(ii)
Draw and label a simple electrical circuit made up of a cell and a switch connected to two electric bulbs connected in parallel.
(a)
Differences between plants and animals
| Plants | Animals |
| Respond slowly to stimuli | Respond quickly to stimuli |
| Autotrophic/manufacture their own food from simple inorganic materials | Heterotrophic/do not manufacture their own food |
| Level of coordination is less than in animals due to absence of complex nervous system | Have complex nervous system which is responsible for their ability to exhibit complex behaviour |
| Do not move from place to place | Move freely from place to place |
| Cells possess large and permanent vacuoles/Large vacuole | Cells possess small and temporary vacuoles |
| Cells possess chloroplasts that contain chlorophyll | Cells have no chloroplasts |
| Excess carbohydrates are stored as starch | Excess carbohydrates in cells are stored as glycogen |
| Take in carbon dioxide to prepare food and release oxygen into the atmosphere | Take in oxygen and release carbon dioxide into the atmosphere |
| Cells have cell wall | Cells have no cell wall |
| Have cellulose | Have no cellulose |
| Growth takes place at definite regions/growth is localized | Growth takes place in all body parts |
| Waste products are stored and used by plants | Animal by-products are toxic/poisonous to cell and must be excreted |
(b)
(i)
A compound is a substance which contains two or more elements chemically combined and cannot be separated by any physical method.
Examples of compounds
1. Water/H2O
2. Common salt/Sodium chloride/NaCl
3. Carbon dioxide/CO2
4. Ammonia/NH3
5. Cupric oxide/Copper (II) oxide/CuO
6. Sulphuric acid/H2SO4
7. Sodium hydroxide/NaOH
8. Ammonium chloride/NH4Cl
9. Hydrochloric acid/HCl
10. Copper (II) sulphate/Copper (II) tetraoxosulphate (VI)/CuSO4
11. Iron (II) chloride/FeCl3
12. Magnesium chloride /MgCl2
13. Iron (II) sulphide/FeS
14. Ammonium hydroxide/NH4OH
15. Calcium carbonate/Carbon (IV) oxide/CaCO3
16. Calcium chloride/CaCl2
17. Silver chloride/AgCl
18. Sodium tetraoxosulphate (VI)/Na2SO4
19. Sodium nitrate/Sodium trioxonitrate (V)/NaNO3
20. Potassium sulphate/Potassium tetraoxosulphate (VI)/K2SO4
(ii)
An element is a pure substance made up of atoms of the same kind.
OR
An element is chemically a simplest substance that cannot be broken down into any simpler form by any known chemical means.
Examples of elements (First 20 elements)
| Atomic Number | Element | Symbol |
| 1 | Hydrogen | H |
| 2 | Helium | He |
| 3 | Lithium | Li |
| 4 | Beryllium | Be |
| 5 | Boron | B |
| 6 | Carbon | C |
| 7 | Nitrogen | N |
| 8 | Oxygen | O |
| 9 | Fluorine | F |
| 10 | Neon | Ne |
| 11 | Sodium | Na |
| 12 | Magnesium | Mg |
| 13 | Aluminium | Al |
| 14 | Si | Silicon |
| 15 | Phosphorus | P |
| 16 | Sulphur | S |
| 17 | Chlorine | Cl |
| 18 | Argon | Ar |
| 19 | Potassium | K |
| 20 | Calcium | Ca |
(c)
(i)
Differences between electrical insulators and electrical conductors
| Electrical insulators | Electrical conductors |
| Does not conduct electricity | Conducts electricity |
| Has narrow conduction energy band | Has wide conduction energy band |
| There exists a wide forbidden energy gap between valence and conduction band | Has no forbidden energy gap |
| Electrons firmly bound to nucleus | Electrons loosely bound to nucleus |
| There are no free electrons | Has more free electrons |
(ii)
A simple electrical circuit made up of a cell and a switch connected to two electric bulbs connected in parallel
2.
a)
i)
What is a force?
ii)
State two ways in which force could affect a body.
b)
i)
What is a chemical change?
ii)
State three difference between chemical change and physical change.
c)
Name three physical properties of soil.
d)
Mention three diseases of the circulatory system in humans.
a)
i)
Force is a push or pull.
OR
A force is that which changes a body's state of rest or uniform motion.
ii)
Ways in which force could affect a body
1. It changes direction of a moving body
2. It increases speed of a body/causes a body to accelerate
3. It decreases speed of a body/causes a body to decelerate
4. It causes a moving body to stop
5. It causes a stationary body to move
6. It causes deformation/changes the shape of a body
b)
i)
Chemical change is any change that results in the formation of new chemical substances/involves making/breaking of bonds between atoms.
ii)
Differences between chemical change and physical change
| Chemical Change | Physical Change | |
| 1. | A new substance is formed | No new substance is formed/substance does not change |
| 2. | Not reversible | Easily reversible |
| 3. | Produces change in mass | Produces no change in mass |
| 4. | Usually accompanied by great heat change/energy | Not accompanied by great heat change/energy |
c)
Physical properties of soil
1. Texture
2. structure
3. Consistence/soil strength
4. Soil colour
5. Bulk density
6. Soil temperature
7. Soil permeability/water holding capacity
d)
Diseases of the circulatory system in humans
1. Coronary artery disease/thrombosis
2. Arteriosclerosis
3. Stroke
4. Hypertension (high blood pressure)
5. Hypotension (low blooed pressure)
6. Heart failure
7. Varicose vein
8. Haemorrhoids/piles
9. Leukaemia/cancer of the blood
3.
(a)
An atom has an atomic number of 8 and a mass number of 16. State the number of each of the following in the atom:
(i)
Protons
(ii)
Electrons
(iii)
Neutrons
(b)
(i)
Draw the structure of the atom in (a) above
(ii)
If the atom in (a) above gains two electrons what will be the charge of the ion?
(c)
State the end-product of the following food substances:
(i)
Carbohydrates
(ii)
Proteins
(iii)
Fats
(d)
(i)
What is the preservation of food?
(ii)
List four methods of food preservation.
Explain why one of the methods you have listed is used for food preservation.
(e)
(i)
An object is placed in front of a plane mirror. Draw a ray diagram to show how the image of the object is formed.
(ii)
State two characteristics of an image formed by a plane mirror.
(a)
Number of protons = Number of electrons = Atomic number
Atomic number = 8
An atom has an atomic number of 8 and a mass number of 16
(i)
Protons = 8
(ii)
Electrons = 8
(iii)
Mass number = Number of protons + Number of neutrons
Number of neutrons = Mass number - Number of protons
Mass number = 16
Number of neutrons = 16 - 8
Number of neutrons = 8
(b)
(i)
(ii)
The ion will have a charge of -2
(c)
End-product of food substances
(i)
Carbohydrates → Glucose
(ii)
Proteins → Amino acids
(iii)
Fats → Fatty acid and glycerol
(d)
(i)
Preservation of food is a way/process of preventing food from spoiling/decaying.
(ii)
Methods of food preservation
Boiling
Heat destroys/kills bacteria/germs already in the food.
Smoking
Water is taken out from the food/heat destroys/kills bacteria/germs already in the food.
Drying
Water is taken out from food. This prevents bacteria from acting on the food to cause decay
Frying
Water is taken from the food and this prevents decay.
Canning/Bottling
Food is heated/boiled to destroy/kill bacteria/germs present. Preservatives are added and sealed.
Freezing
Food is kept under a very low temperature which prevents bacteria/germs from acting or multiplying at that temperature.
Salting
Water is removed to prevent growth of bacteria.
(e)
(i)
(ii)
Characteristics of an image formed by a plane mirror
1. The image formed is laterally inverted
2. The image formed is virtual
3. The image formed is same size as the object
4. The image formed is upright/erect
5. Image distance from the mirror is the same as the object distance
4.
a)
i)
What are derived quantities?
ii)
State the S.I units of the following quantities:
α)
area;
β)
volume.
b)
i)
State two factors necessary for photosynthesis.
ii)
Explain the functions of each of the factors stated in (i).
c)
Explain each of the following terms:
i)
Soft water;
ii)
Hard water.
d)
State three reasons why some seeds are nursed.
a)
i)
Derrived quantities are quantities which are combination/multiples/ratios of base/fundamental quantities
ii)
S.I. units of area and volume
α)
Area → m2/square metre
β)
Volume → m3/cubic metre
b)
i)
Factors necessary for photosynthesis
1. Sunlight
2. Chlorophyll
3. Carbon dioxide
4. Water
ii)
Function of sunlight
Is to separate the hydrogen and oxygen atoms of water/provides energy
Functions of chlorophyll
Absorbs/traps light
Function of water
Splits into oxygen, hydrogen ions and electrons to replace the lost electrons/raw material/combines with CO2 to produce food
Function of carbon dioxide
It's a raw material/used in splitting water/is reduced to sugar
c)
i)
Soft water is water that lathers easily/readilt with soap/water which does not contain/contains negligible Ca2+/Mg2+/Ca/Mg ions/salt
ii)
Hard water is water that does not lather easily/readily with soap/water which contains Ca2+/Mg2+/Ca/Mg ions/salt
d)
Reasons why some seeds are nursed
1. Some seeds are unable to withstand adverse weather conditions
2. Tiny seeds/provides favourable growth conditions
3. Better protection/care for seedlings (which are delicate)
4. Enables selection of healthy seedlings
5. Some seeds need special treatment to enhance germination/better germination
6. Eliminates problems of unfavourable soil conditions
7. Easy control of weeds
8. Reduces field management cost
9. Improves crop growth uniformity
10. Nursed seeds provide higher yield
5.
(a)
Study the simple circuit diagram shown below and answer the questions that follow.
(i)
Identify the components labelled I, II, III, IV, V and VI
(ii)
Which component is used to close the circuit?
(iii)
State the observation that will be made when the circuit is closed.
(iv)
State the energy transformations that take place when the circuit is closed
(v)
Give the name of the circuit connection between components IV and VI
(b)
The diagram below is an illustration of an experimental set-up used for separating a mixture of water and alcohol. Study the diagram carefully and answer the questions that follow.
(i)
State the method of separation shown in the set-up.
(ii)
Identify liquid Y, with reasons.
(iii)
Give the functions of the thermometer and the water jacket X
(iv)
What physical processes are involved in the method of separating the mixture?
(v)
State the physical property which makes it possible to separate the water and alcohol.
(c)
A student performed tests on food substances A, B and C and made the following observations
| Food substance | Test | Observation |
| A | Few drops of iodine solution was added to A | The iodine solution turns blue-black |
| B | A drop of B was applied to a white sheet of paper | A translucent patch was seen on the paper |
| C | Benedict's solution was added to C and the mixture boiled | Benedicts's solution turns from blue to brick-red |
(i)
Identify food substances A, B and C.
(ii)
Give the products of digestion of A, B and C
(iii)
In which parts of the alimentary canal does the digestion of each of food substances A, B and C start?
(iv)
In which part of the alimentary canal is food substance C absorbed after digestion?
(a)
(i)
I → Cell/battery
II → Key/switch
III → Ammeter
IV → Lamp/bulb
V → Rheostat/variable resistor
VI → Voltmeter
(ii)
II/Key/Switch
(iii)
The lamp (IV) will light
OR
The ammeter (III) will deflect
OR
The voltmeter (VI) will deflect
(iv)
Chemical energy (of cell) → Electrical energy (in wires) → Light/heat energy (in bulb)
(v)
Parallel connection
(b)
(i)
Distillation/Fractional distillation
(ii)
Y → Alcohol because it has a lower boiling point than water/it boils off/evaporates first before water.
(iii)
Function of the thermometer
Is used to note/measure/determine the temperature (at which the mixtures boil/separate)
OR
It is used to note/measure/determine the boiling points of the mixtures
Function of the water jacket X
It is used to condense/cool the vapour
(iv)
Liquid →heat Vapour →cool Liquid
OR
Heating → Vaporisation → Condensation
(v)
Water and alcohol have different boiling points.
(c)
(i)
A → Starch
B → Oil/Fat/Lipid
C → Reducing/simple sugar/glucose
(ii)
A (Starch) → Glucose/fructose
B (Oil/Fat/Lipid) → Fatty acids/glycerol
C (Reducing/simple sugar/glucose) → Glucose/No digestion occurs/remains the same
(iii)
A → Mouth
B → Duodenum/small intestine
C → Not digested/passes through the system
(iv)
C (Reducing/simple sugar/glucose) is absorbed in the small intestine (ileum)
6.
a)
i)
What is a satellite?
ii)
Give three uses of artificial satellites.
b)
State the composition of each of the following alloys:
i)
Brass
ii)
Steel
iii)
Bronze
c)
Name three cultural practices used in vegetable production.
d)
List four parts of the respiratory system in humans.
a)
i)
A satellite is an object that moves around a larger object in space.
OR
A satellite is an artificial body placed in orbit round the earth or another planet.
ii)
Uses of artificial satellite
1. For exploring the planets/moons
2. For scientific research/experimental research/internet
3. To study the universe
4. For communications/broadcasting/telephone call
5. For weather forecast/collecting information on the weather
6. Map making
7. Spying
8. For navigation/satellite for navigation
9. Military purposes
b)
Composition of alloys
i)
Brass → Copper and zinc
ii)
Steel → Iron and carbon
iii)
Bronze → Copper and tin
c)
Cultural practices used in vegetable production
1. Watering/irrigation
2. Application of fertilizer
3. Stirring
4. Weeding/weed control
5. Mulching
6. Staking
7. Prunning
8. Pest control
9. Disease control
10. Drainage
11. Earthing-up
12. Decrusting
13. Supplying
14. Garden layout
d)
Parts of the respiratory system in humans
1. Nostril
2. Nasal cavity
3. Pharynx
4. Larynx/voice box
5. Trachea/windpipe
6. Lungs
7. Diaphram
8. Bronchi
9. Bronchioles
9. Alveoli/airsacs