KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
The stretched arm of a JSS student holding a stone in the palm is an example of a
A.
First class lever
B.
Second class lever
C.
Third class lever
D.
Fourth class lever
E.
Fifth class lever
Answer: C
2.
Which of the following arrangements show the correct order of increasing complexity of structures in living organisms.
A.
cells → organs → tissues → systems
B.
cells → tissues → organs → systems
C.
cells → systems → tissues → organs
D.
cells → tissues → systems → organs
Answer: B
3.
The feeling of soil between fingers is used to determine the
A.
texture of the soil.
B.
drainage of the soil.
C.
capillary of the soil.
D.
water holding capacity of the soil.
Answer: A
4.
Which of the following gases is involved in the process of rusting?
A.
H2
B.
Co2
C.
O2
D.
N2
Answer: C
The conditions necessary for rusting are water (moisture) and oxygen.
5.
In a first class lever, the load is placed
A.
on the effort
B.
between the effort arm and the pivot
C.
at one end of the load arm
D.
between the pivot and the load arm
E.
on the pivot
Answer: C
6.
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
7.
The process used in getting salt from sea water is
A.
boiling
B.
condensation
C.
decantation
D.
sedimentation
E.
evaporation
Answer: E
8.
Which of the following preventive measures is not used in the control of tuberculosis?
A.
Isolating the patient
B.
Spitting carelessly in the environment
C.
Keeping separate cutlery, plates, cups for the patient
D.
Vaccinating young babies with BCG vaccine
E.
Spitting into a container partly filled with disinfectant
Answer: B
9.
Kerosene is able to reach the other end of a wick by
A.
diffusion.
B.
suction pressure.
C.
capillary action.
D.
osmosis.
Answer: C
10.
How many stages does the mosquito go through in its life cycle of development?
A.
1
B.
2
C.
3
D.
4
Answer: D
11.
A temperature controlling device which works using the principles of expansion and contraction is called a
A.
conductor
B.
fuse
C.
manometer
D.
thermometer
E.
thermostat
Answer: E
12.
Which of the following properties is true about all matter? Matter has
A.
volume and fixed shape.
B.
volume and mass.
C.
mass and indefinite volume.
D.
density and fixed shape.
Answer: B
13.
Changes in pressure in the middle ear is regulated by the
A.
ampullae.
B.
cochlea.
C.
eustachian tube.
D.
ear drum.
Answer: C
14.
In what units are work and energy measured?
A.
work in joules, energy in watts
B.
work in joules, energy in joules
C.
work in newtons, energy in joules
D.
energy in watts, work in watts
E.
energy in newtons, work in joules
Answer: B
15.
Which of the following methods protects pure iron from rusting by coating with zinc?
A.
Alloying
B.
Galvanizing
C.
Greasing
D.
Painting
Answer: B
16.
Soil acidity can be reduced by adding
A.
acid solution
B.
ammonium sulphate
C.
fertilizer
D.
lime
E.
rotten leaves
Answer: D
17.
The central nervous system is made up of the
A.
brain and nerves.
B.
brain and spinal cord.
C.
veins and nerves.
D.
skull and spine.
Answer: B
18.
The following practices are cultural practices in crop production except
A.
nursing.
B.
pest control.
C.
mulching.
D.
weeding.
Answer: A
Cultural practices of vegetable crop production
These are practices that are carried out after planting vegetable crops on the field up to the time of harvesting.
They include the following:
1. Mulching
2. Thinning out
3. Pruning
4. Stirring
5. Weeding
6. Fertilizer application
7. Earthing-up
8. Pest control
9. Disease control
10. Harvesting
11. Storage
12. Marketing
19.
When elements combine to form a compound the
A.
constituents can be separated by a physical process.
B.
volume of the compound is the sum of the volumes of the constituents.
C.
reaction does not involve a heat change.
D.
reaction can be represented by a chemical formula.
Answer: D
20.
How much work is done when a kerosene tin is pushed with a force of 20 N through a distance of 2 m?
A.
0.01 J
B.
0.10 J
C.
10.0 J
D.
20.0 J
E.
40.0 J
Answer: E
Work done = Force x Distance
Force = 20 N
Distance = 2 m
Work done = 20 N x 2 m = 40 J
21.
All the living and non-living things that surround an organism constitute its
A.
community.
B.
ecosystem.
C.
environment.
D.
habitat.
Answer: C
Environment
A sum total of all the living and non-living elements and their effects that influence human life.
Habitat:
A smaller geographic area where an organism resides is called habitat.
Ecosystem:
A larger geographical area that comprises other species and their interactions is called an ecosystem.
22.
Amino acids are the end-products of the digestion of
A.
carbohydrates.
B.
fats.
C.
oils.
D.
proteins.
Answer: D
23.
An example of inorganic fertilizer is
A.
ammonium nitrate.
B.
cow dung.
C.
farmyard manure.
D.
poultry dropping.
Answer: A
24.
The part of sugar cane that is usually used for planting is the
A.
corm.
B.
leaf.
C.
stem.
D.
sucker.
Answer: C
25.
Which of these structures regulate the amount of light that enters the eye?
A.
Retina
B.
Cornea
C.
Pupil
D.
Choroid
E.
Lens
Answer: C
26.
Which of the following fruits is adapted for dispersal by air?
A.
Succulent fruit
B.
Brightly coloured fruit
C.
Sticky fruit
D.
Hairy fruit
Answer: D
27.
Gin can be obtained from palm wine by
A.
condensation
B.
freezing
C.
sedimentation
D.
distillation
E.
filtration
Answer: D
28.
Some plants shed their leaves during the dry season to prevent
A.
water loss.
B.
heat loss.
C.
catching fire.
D.
losing nutrients.
Answer: A
29.
When an unknown solution reacted with magnesium, a gas was produced. Which of the following solutions could be the unknown solution
A.
Sodium chloride solution
B.
Sodium hydroxide solution
C.
Hydrochloric acid
D.
Calcium nitrate solution
Answer: C
When Hydrochloric acid react with magnesium a gas is always liberated.
30.
The parts of a bony fish that are used to control the level at which the fish swims are known as
A.
dorsal and caudal fins.
B.
caudal and pectoral fins.
C.
pectoral and pelvic fins.
D.
dorsal and pectoral fins.
Answer: C
31.
The human forearm is an example of
A.
a first class lever.
B.
a second class lever.
C.
a third class lever.
D.
both first and third class levers.
Answer: C
32.
Global warming is caused by the
A.
circulation of oxygen in the atmosphere.
B.
excessive release of carbon dioxide into the atmosphere.
C.
release of hydrogen into the atmosphere.
D.
circulation of nitrogen in the atmosphere.
Answer: B
33.
Ice floats on water because
A.
water is denser than ice
B.
ice is denser than water
C.
ice has the same temperature as water
D.
ice has a lower temperature than water
E.
ice is different from water
Answer: A
34.
The structure that stores sperms temporarily in the male reproductive system of humans is
A.
epididymis.
B.
scrotal disc.
C.
sperm duct.
D.
testes.
Answer: A
35.
Which of the following takes the shape of its container?
A.
Chalk
B.
Charcoal
C.
Paper
D.
Petrol
E.
Stone
Answer: D
36.
What structure links the mouth to the stomach
A.
Colon
B.
Duodenum
C.
Oesophagus
D.
Rumen
E.
Trachea
Answer: C
37.
Disposal of sewage into a river which supplies water for domestic use may lead to an outbreak of
A.
malaria
B.
cholera
C.
guinea worm
D.
river blindness
E.
tuberculosis
Answer: B
38.
Which of the following food substances is not involved in respiration?
A.
Amino acids
B.
Fatty acids
C.
Glucose
D.
Vitamins
Answer: D
39.
Salt could be obtained from sea water by
A.
boiling
B.
condensation
C.
decantation
D.
distillation
E.
evaporation
Answer: E
40.
The type of lever shown above is a
A.
first class lever.
B.
second class lever.
C.
third class lever.
D.
combination of first and second class levers.
Answer: C
First class → Pivot/Fulcrum at the middle
Second class → Load at the middle
Third class → Effort at the middle
In summary PLE which is the last three letters of PEOPLE if you may forget in an examination.
THEORY QUESTIONS
1.
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.
2.
a)
i)
Explain the following terms as applied to machines:
α)
work input;
β)
work output.
ii)
State one factor that limits work output for a given work input in a simple machine.
b)
i)
What is chloroplast?
ii)
Differentiate between aerobic respiration and anaerobic respiration.
c)
State the colour change that would occur when blue litmus paper is dipped onto a solution of:
i)
α)
vinegar;
β)
wood ash.
ii)
Name the products formed when hydrochloric acid reacts with sodium hydroxide.
d)
List two benefits of vegetables to humans.
a)
i)
α)
Work input is the total energy or work applied to a machine for it to be able to work
Work input = Effort x Effort distance moved
β)
Work out is the total energy or work obtained by using machines to do work
Work output = Load x Load distance moved
ii)
Factors that limit work output
1. Friction/wear and tear
2. Age of machine/period of usage
3. Weight of machine parts
b)
i)
Chloroplast is an organelle or structure found in (plant) cell and it contains chlorophyll or green pigment.
ii)
Differences between aerobic and anaerobic respiration
| Aerobic Respiration | Anaerobic Respiration |
| Requires oxygen | Does not require oxygen |
| Produces large amount of energy | Produces small amount of energy |
| Carbon dioxide and Water are produced | Ethanol or lactic acid is produced |
c)
Colour changes when blue litmus paper is dipped into the following solutions
i)
α)
Vinegar
Vinegar is acidic hence will turn blue litmus paper to red
β)
Wood Ash
Wood ash is an alkaline and so there will be no colour change or the blue litmus paper remains the same
ii)
Product formed when hydrochloric acid reacts with sodium hydroxide
Sodium chloride and water is formed
d)
Benefits of vegetables to humans
1. Prevent constipation
2. Supply roughage for easily digestion of food
3. To garnish or decorate food
4. Provide humans with vitamins/carbohydrates/proteins/mineral salts/food nutrients/food
5. Source of medicine
3.
(a)
(i)
What is meant by a satellite?
(ii)
State one difference between a natural and an artificial satellite.
(iii)
State two uses of artificial satellite.
(b)
Give two differences between the mass and weight of a body.
(c)
Write the chemical formulae for the following substances.
(i)
Calcium oxide;
(ii)
Water;
(iii)
Copper sulphate.
(d)
What will be the effect on the colour of blue litmus paper when it is dropped in each of the following solutions?
(i)
Sodium hydroxide solution;
(ii)
Dilute hydrochloric acid;
(iii)
Lime juice;
(iv)
Water.
(e)
(i)
Define breathing
(ii)
Arrange the following parts of the human being respiratory system in order in which air from the atmosphere passes through them during breathing:
Trachea, nostrils, lungs and bronchus.
(iii)
Describe briefly what happens to a piece of bread when it reaches the duodenum of a human being.
(a)
(i)
A satellite is an object which moves around a planet in space
(ii)
Differences between a natural and an artificial satellite
| Natural satellite | Artificial satellite |
| Has no engine | Uses rockets/engines |
| Not projected by man | Launched into space by man |
| It is permanent | It is temporary |
| Created by God before our forefathers | Man made |
| Its orbit is fixed | Its orbit can be varied |
(iii)
Uses of artificial satellites
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)
Differences between the mass and weight of a body
| Mass | Weight |
| Mass is measured in kilogrammes (Kg) | Weight is measured in newtons (N) |
| Mass is not a force | Weight is a force |
| Mass is a scalar quantity | Weight is a vector quantity |
| Mass is constant everywhere | Weight varies from place to place |
(c)
(i)
Calcium oxide → CaO
(ii)
Water → H2O
(iii)
Copper sulphate → CuSO4
(d)
| # | Solution + Blue litmus paper | Observation |
| i) | Sodium hydroxide solution | No colour change on litmus paper/colour of litmus paper remains the same because sodium hydroxide is a base |
| ii) | Dilute hydrochloric acid | The colour of the litmus paper changes from blue to red because hydrochloric acid is an acid |
| iii) | Lime juice | The colour of the litmus paper changes from blue to red because lime juice is an acid |
| iv) | Water | No colour change on litmus paper/colour of litmus paper remains the same because water is neutral |
(e)
(i)
Breathing is the process by which animals take in oxygen and give out carbon dioxide through their lungs/respiratory organs.
(ii)
The human being respiratory system in order in which air from the atmosphere passes through them during breathing
Nostrils → Trachea → Bronchus → Lungs
(iii)
Digestion of a piece of bread when it reaches the duodenum of a human being
1. When the bread gets into the duodenum, the pancreas produces a liquid called pancreatic juice
2. The pancreatic juice contains an enzyme called amylase which breaks down the bread (carbohydrate) into complex sugar (maltose)
4.
(a)
(i)
Define Pressure
(ii)
Explain why it is important to sharpen a knife before use.
(b)
(i)
State two differences between metals and non-metals.
(ii)
What is an alloy?
(ii)
Mention the components of each of the following alloys:
(α)
steel;
(β)
brass.
(c)
Mention three conditions suitable for rearing tilapia in a fishpond.
(d)
Explain how the streamlined body of a bony fish enables it to live successfully in water.
(a)
(i)
Pressure is defined as force per unit area applied in a direction perpendicular/normal to the surface of the object.
OR
Pressure =
(ii)
Why it is important to sharpen a knife before use
When a knife is sharpened, the cutting edge becomes smaller so that with a little force applied, a larger pressure is exerted for cutting to be easier.
(b)
(i)
Differences between metals and non-metals
| # | Metal | Non-metal | |||
| 1. | Normally solid | Can be solid or liquid or gas | |||
| 2. | Corrosive | Non corrosive | |||
| 3. | Attracted by magnet | Not attracted by magnet | |||
| 4. | Conducts electricity | Does not conduct electricity/poor conductor of electricity | |||
| 5. | Conducts heat/good conductor of heat | Does not conduct heat/poor conductor of heat | |||
| 6. | Malleable | Not malleable | |||
| 7. | Ductile | Not ductile/Brittle | |||
| 8. | High density | Low density | |||
| 9. | High melting point | Low melting point | |||
| 10. | Has shinning/lustre surface | Has dull surface | |||
| 11. | Gives out electrons (forms cations) as reducing agent | Receives/accepts electrons (forms anions) as oxidizing agent | |||
| 12. | High tensile strength | Low tensile strength |
(ii)
An alloy is a uniform/homogeneous mixture of a metal and another metal or a non-metal.
(ii)
Components of alloys
(α)
steel → carbon and iron
(β)
brass → copper and zinc
(c)
Conditions suitable for rearing tilapia in a fishpond
1. Presence of dissolved oxygen
2. Ideal/suitable/favourable pH
3. Suitable temperature
4. Suitable salt concentration/salinity
5. Suitable depth of water/pond depth
6. Non-polluted/non-contaminated/clean water
(d)
The streamlined body of a bony fish enables it to move freely to cut its way through water easily with least resistance from water molecules.
5.
(a)
(i)
What is refraction of light?
(ii)
Sketch a diagram to show the path of a light ray when it travels from air to glass.
(b)
Explain why it is difficult to separate iron and sulphur mixture after strong heating.
(c)
(i)
Give two examples of digestive enzymes produced in humans.
(ii)
For each of the enzymes given in (i), name the part of the human body where the enzyme is produced.
(d)
List four methods of applying fertilizers to crops.
(a)
(i)
Refraction of light is the bending/change in direction/change in velocity of light as it travels from one medium to another.
(ii)
(b)
Why it is difficult to separate iron and sulphur mixture after strong heating
It leads to a chemical change resulting in the formation of a compound (iron sulphide)/a compound is formed.
(c)
| Name of enzyme | Part of the human body where it is produced |
| Ptyalin | Salivary gland |
| Amylase | Pancreas/Small intestine |
| Pepsin | Stomach |
| Rennin | Stomach |
| Lipases | Pancreas/Small intestine |
| Trypsin | Small intestine |
(d)
Methods of applying fertilizers to crops
1. Ringing
2. Side placement/side dressing
3. Foliar/aerial application/spraying
4. Inter-raw placement
5. Band placement
6. Drilling
7. Broadcasting
8. Through irrigation water/fertigation
9. Top dressing
6.
(a)
The diagram below represents the stages in the life cycle of a mosquito.
Study the diagrams carefully and answer the questions that follow.
(i)
Name each of the stages labelled I, II, III and IV.
(ii)
State how stage II obtains oxygen.
(iii)
State two methods of controlling each of the stages labelled III and IV.
(b)
The diagrams below are different laboratory set-ups used in the separation of mixtures.
Study the diagrams carefully and answer the questions that follow.
(i)
Name each of the parts labelled I, II, III, IV and VI.
(ii)
Name the separation method represented by each diagram.
(iii)
Which of the set-ups is used to obtain clear water from muddy water?
(iv)
Which of the set-ups is used to obtain salt from salt solution?
(c)
The diagrams below show some instruments used in the laboratory.
Study the diagrams carefully and answer the questions that follow.
(i)
Identify each of the instruments labelled I, II, III, IV and V.
(ii)
State one use of each of the instruments labelled I, II, III and IV.
(iii)
Read and record the volume of the liquid in the instrument labelled V.
(d)
The diagram below shows the digestive system of a class of farm animals.
Study the diagram carefully and answer the questions that follow.
(i)
Name each of the parts labelled I, II, III and IV.
(ii)
State one function each of the parts labelled II and IV.
(iii)
Name two farm animals that possess this type of digestive system.
(iv)
Mention two diseases which affect this class of farm animals.
(a)
(i)
I → (Raft of) eggs
II → Larva
III → Pupa
IV → (Adult) mosquito
(ii)
How the larva obtains oxygen
It takes oxygen from the atmosphere/surface of water through its breathing tubes.
(iii)
Methods of controlling pupa
1. Introducing predators such as fishes into stagnant water or pond water/use of biological methods of control
2. Pouring of oil/kerosene on surface of the water
3. Draining of stagnant water
Methods of controlling adult mosquito
1. Spray with/Use of insecticides to kill adult mosquito
2. Use of mosquito coil
3. Clearing of weeds/bushes around houses
4. Use of special electric bulbs
5. Use f special paints such as Inesfly
6. Use of treated mosquito net
(b)
(i)
I → Beaker
II → Evaporating dish
III → Bunsen burner
IV → Funnel
VI → Tripod stand
(ii)
Methods of separation of mixtures
A → Filtration
B → Evaporation
C → Sublimation
(iii)
Set-up A / Filtration
(iv)
Set-up B / Evaporation
(c)
(i)
I → Tape measure/Surveyor's tape/Measuring tape/Tape
II → Stop clock/Stop watch
III → Thermometer
IV → Weighing scale / Balance/ Top pan balance
V → Measuring cylinder
(ii)
Use of instruments labelled
I → For measuring lengths/distance
II → For measuring time
III → For measuring temperature
IV → For measuring weight or mass of objects
(iii)
The volume of the liquid in the measuring cylinder is 160 cm3
(d)
(i)
I → Oesophagus
II → Gizzard
III → Liver
IV → Crop
(ii)
Function of II (Gizzard)
It is for grinding food.
Function of IV (Crop)
It is used to temporarily store food.
(iii)
Farm animals that possess this type of digestive system
1. Fowl/chicken
2. Cattle/cow
3. Turkey
4. Goat
5. Ducks
6. Sheep
7. Guinea fowl
8. Horse
(iv)
Diseases which affect this class of farm animals
Monogastrics
1. Coccidiosis
2. Pullorum
3. Newcastle
4. Fowl pox
5. Gumboro
6. Bacillary diarrhea
7. Fowl cholera
8. Chronic respiratory disease
9. Bird/Avian flu
Ruminants
1. Foot and mouth disease
2. Anthrax
3. Cow pox/Vaccinna
4. Rinderpest
5. Goat pox
6. Pneumonia
7. Tryponosomiasis/Nagana
8. Tuberculosis