KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
All veins in the body carry blood that does not contain oxygen with the exception of the veins from the
A.
heart.
B.
kidneys.
C.
lungs.
D.
liver.
Answer: C
2.
The farming system that makes the most effective use of land is
A.
crop rotation.
B.
land rotation.
C.
mixed cropping.
D.
mixed farming.
Answer: D
3.
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
4.
The joule is the S.I unit for
A.
energy.
B.
force.
C.
power.
D.
pressure
Answer: A
5.
In a machine, 200.0 J of energy was lost as heat. If the energy input is 600.0 J, what is the efficiency of
the machine?
A.
67%
B.
40%
C.
33%
D.
30%
E.
12%
Answer: A
Efficiency of a machine = x 100%
Work/Energy output = Work/Energy input - Energy Lost
Work/Energy output = 600 J - 200 J
Work/Energy output = 400 J
Efficiency of a machine = x 100% = 66.67% ≈ 67%
6.
The type of liquid suitable to construct a thermometer to read temperatures of about 150oC is
A.
alcohol.
B.
mercury.
C.
turpentine.
D.
water.
Answer: B
Why mercury is used in thermometers
Mercury is used in thermometers because It has a high coefficient of expansion so that even a small rise in temperature brings about sufficient expansion which can be detected in the capillary of the calibrated part of the thermometer.
Mercury is a liquid from -39oC to 357oC.
Mercury is a good heat conductor. As a result, the mercury level indicates the temperature as soon and accurately as feasible.
Mercury does not adhere to the surface of the glass. As a result, it can freely move inside the capillary glass tube.
Mercury expands uniformly across the entire temperature range. As a result, the temperature is accurate.
7.
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
8.
Water that forms lather readily with soap is said to be
A.
clean.
B.
hard.
C.
soapy.
D.
soft.
Answer: D
9.
An example of a third class lever is
A.
wheelbarrow.
B.
sugar tongs.
C.
pair of scissors.
D.
crowbar.
Answer: B
10.
The reason for chewing food before swallowing is to
A.
soften the food
B.
make digestion faster
C.
cause saliva to flow out
D.
exercise the jaws
E.
make the teeth strong
Answer: A
11.
The practice of growing cowpea and maize on a piece of land at the same time is known as
A.
mixed farming.
B.
mixed cropping.
C.
land rotation.
D.
crop rotation.
Answer: B
Mixed Cropping
When two or more crops are grown on the same land simultaneously (at the same time), it is known as mixed cropping
Mixed Farming
Growing crops as well as livestock, animal husbandry,etc all on same farm or land.
Crop Rotation
The practice of planting different crops across a sequence of growing seasons on the same plot of land to improve soil health, optimize nutrients in the soil, and combat pest and weed pressure.
12.
Each layer of soil profile is known as
A.
horizon.
B.
litter.
C.
regolith.
D.
solum.
Answer: A
13.
Which of the following conditions promote(s) rusting of iron?
I. Air
II. Moisture
III. Oil
A.
I only
B.
II only
C.
I and II only
D.
II and III only
Answer: C
14.
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.
15.
One disease which can be transmitted through eating half cooked meat is
A.
guinea worm.
B.
hook worm
C.
thread worm.
D.
tape worm.
Answer: D
16.
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.
17.
The part of cocoyam which is used in propagation is the
A.
bulb
B.
corm
C.
seed
D.
sucker
E.
rhizome
Answer: B
18.
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
19.
A suitable machine for loading drums of palm oil onto a truck is
A.
a screw.
B.
a crowbar.
C.
a wheelbarrow.
D.
an inclined plane.
Answer: D
20.
The ovules in a flower develop to form the
A.
fruit.
B.
leaf.
C.
seed.
D.
stem.
Answer: C
21.
Gaps are left between railway lines to
A.
prevent contraction.
B.
prevent rusting.
C.
allow for expansion.
D.
enable a train to stop.
Answer: C
22.
Which of the following methods can be used to prevent iron from rusting?
I. Painting
II. Alloying
III. Keeping the iron in a desiccator
IV. Keeping iron in a moist environment
A.
I and II only
B.
II and IV only
C.
I, II and III only
D.
II, III and IV only
Answer: A
Methods of preventing rusting
1. Painting
2. Plating or galvanizing
3. Alloying
4. Greasing or oiling
23.
Which of the following plants reproduce(s) vegetatively?
I. Banana
II. Mango
III. Ginger
A.
II only
B.
I and II only
C.
I and III only
D.
III only
Answer: C
Vegetative reproduction, any form of asexual reproduction occurring in plants in which a new plant grows from a fragment of the parent plant or grows from a specialized reproductive structure (such as a stolon, rhizome, tuber, corm, or bulb).
24.
A fuse is used in an electrical circuit to
A.
measure the energy used up.
B.
protect appliances.
C.
provide more current.
D.
make sure current flows continuously.
Answer: B
A fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. It is designed to melt and separate in the event of excessive current thereby stopping or interrupting the current.
25.
The device that uses an electromagnet in its operation is the
A.
electric bell.
B.
electric iron.
C.
radio.
D.
refrigerator.
E.
sewing machine.
Answer: A
Process of the working of an electric bell
1. The switch is pressed and current flows through the circuit.
2. The electromagnet is powered and generates a magnetic field that attracts the iron strip towards it.
3. The striker strikes the gong (bell).
4. When the striking arm strikes the gong, the contact is broken and the current stops flowing through the circuit.
5. This causes the electromagnet to lose its magnetic field.
6. The connected spring arm returns the striker to its original rest position.
7. The contact is restored and current flows through the circuit (provided the main switch is still pressed).
26.
The use of resistant varieties of crop in controlling diseases is described as
A.
biological control method.
B.
chemical control method.
C.
cultural control method.
D.
physical control method.
Answer: A
27.
Which of the following statements about a second class lever is correct? The
A.
pivot is between the load and the effort.
B.
pivot and the load are at the same position.
C.
load is between the effort and the pivot.
D.
effort is between the load and the pivot.
Answer: C
28.
Which of the following statements about all living things is/are true?
I. They respire
II. They manufacture their own food
III. They grow
A.
I only
B.
II only
C.
I and II only
D.
I and III only
E.
II and III only
Answer: D
Only plants manufacture their own food.
29.
During drought, some plants dry out because of high
I. atmospheric temperature
II. humidity
III. rate of evaporation
A.
III only
B.
I and II only
C.
I and III only
D.
I, II and III
Answer: C
30.
Producers in an ecosystem are plants that
A.
attract insects
B.
feed on other plants
C.
feed on dead materials
D.
manufacture their own food
Answer: D
31.
Which pf the following organs is used by the fish for movement?
A.
Eye
B.
Fin
C.
Gill
D.
Tail
E.
Mouth
Answer: B
32.
A uniform mixture of two or more metals is called
A.
an alloy.
B.
a coiled.
C.
an aerosol.
D.
a compound
Answer: A
33.
In which units are the vast distances between stars in space measured?
A.
Knots
B.
Kilometres
C.
Furlongs
D.
Miles
E.
Light years
Answer: E
34.
Which of the following materials transforms electrical energy into light energy?
A.
Electric bell
B.
Filament bulb
C.
Electric guitar
D.
Lantern
E.
Radio
Answer: B
35.
All the following substances are mixtures except
A.
ink
B.
blood
C.
air
D.
palm wine
E.
carbon dioxide
Answer: E
36.
If a mixture of water and powdered charcoal is allowed to stand for a long time, the charcoal
A.
raises to the top.
B.
settles at the bottom.
C.
dissolves completely in the water.
D.
continues to remain suspended in the water.
Answer: B
37.
The fusion of the male and female gametes is known as:
A.
copulation
B.
evolution
C.
fertilization
D.
ovulation
E.
reproduction
Answer: C
38.
How many different elements are present in the compound CuCl2?
A.
Five
B.
Four
C.
Three
D.
Two
E.
One
Answer: D
39.
A metal expands when there is
A.
an increase in heat energy.
B.
an increase in number of electrons.
C.
a decrease in potential energy.
D.
a decrease in distance between atoms.
Answer: A
40.
Which of the following effects are caused by rusting?
I. Loss of strength
II. Loss of structure
III. Loss of electrical conductivity
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: D
THEORY QUESTIONS
1.
(a)
How would you demonstrate that expired air contains carbon dioxide?
(b)
(i)
What is an ion
(ii)
Give two examples of ions
(c)
(i)
What is capillary action
(ii)
State two processes which use capillary action
(d)
(i)
What is a lever?
(ii)
Give two examples of second class levers
(e)
(i)
Use any three of the following organisms to construct a food chain.
Rat, hawk, okro leaves, toad, cassava, man, grasshopper
(ii)
List three ways of keeping the teeth healthy.
(a)
How to demonstrate that expired air contains carbon dioxide
1. Breath out into lime water in a test tube fitted with a delivery tube
2. The colourless lime water turns milky/chalky indicating the presence of carbon dioxide
(b)
(i)
An ion is an electrically charged atom
OR
An ion is an atom or group of attoms which have lost or gain electron(s).
(ii)
Examples of ions
1. Potassium ion (K+)
2. Sodium ion (Na+)
3. Chlorine ion (Cl-)
4. Magnesium ion (Mg2+)
5. Hydroxide ion (OH-)
6. Sulphate ion (SO42-)
7. Aluminum ion (Al3+)
8. Calcium ion (Ca2+)
8. Copper (I) ion (Cu+)
9. Copper (II) ion (Cu2+)
10. Hydrogen ion (H+)
11. Iron (II) ion (Fe2+)
12. Iron (III) ion (Fe3+)
13. Lead (II) ion (Pb2+)
14. Lithium ion (Li+)
15. Silver ion (Ag+)
16. Tin (II) ion (Sn2+)
17. Zinc ion (Zn2+)
18. Bromide ion (Br-)
19. Fluoride ion (F-)
20. Iodide ion (I-)
21. Nitride ion (N3-)
22. Oxide ion (O2-)
23. Sulfide ion (S2-)
24. Ammonium ion (NH4+)
25. Carbonate ion (CO32-)
(c)
(i)
Capillary action is the rise or fall of liquids in small/narrow tubes/columns as a result of adhesion and surface tension forces.
(ii)
Processes which use capillary action
1. Kerosene moving up the wick in a lamp
2. Water moving from the soil into roots of plants
3. Blotting of ink with blotting paper
4. A sponge absorbing water
5. Placing a straw into a glass of water
(d)
(i)
A lever is a simple machine which consists of a rigid bar/rod free to turn about a fixed turning point called the fulcrum/pivot.
(ii)
Examples of second class levers
1. Wheel barrow
2. Nut cracker
3. Bread knife
4. Bottle opener
5. Paper cutter
6. Staplers
7. Doors or gates
8. Nail clippers
(e)
(i)
Okro leaves → grasshopper → toad
OR
Okro leaves → grasshopper → man
OR
Cassava → rat → hawk
OR
Cassava → rat → man
(ii)
Ways of keeping the teeth healthy
1. Brushing of teeth/chewing stick/removal of food particles in between teeth
2. Avoid taking too much sweets
3. Avoid eating too hot or cold food
4. Visit the dentist regularly
5. Chew roughage to exercise teeth
6. Do not misuse teeth for example using it to open bottle tops
7. Avoid using sharp objects to remove particles in-between teeth
8. Take in food containing calcium/vitamins/phosphorous
2.
(a)
(i)
Given a flashlight, a tennis ball and a screen, draw a diagram to show how a shadow can be formed.
(ii)
A student seeking to determine the volume of an irregular body of mass 4 kg used a graduated cylinder in an experiment.
Fig. 2 illustrates two key stages of the experiment where A indicates a setup before the irregular body was immersed and B indicates the same setup after the irregular body was immersed.
Determine the density of the irregular body.
(iii)
State two precautions that must be taken to obtain reliable results.
(b)
State three safety precautions to prevent accidents during the use of liquefied petroleum gas in the home.
(c)
Explain briefly the scientific princible underlying each of the following waste management practices:
(i)
Composting;
(ii)
Recycling;
(iii)
Incineration.
(d)
The digestive system of two domestic animals were provided. One is that of a goat and the other is that of a rabbit.
Outline three features that would help to differentiate between the two digestive systems.
(a)
(i)
How a shadow can be formed
(ii)
Change in volume = (75 - 50) cm3 = 25 cm3
Density =
Method I
Calculating density in kg dm-3
Note: when using the mass in kilogram (4 kg) the volume must be in dm3.
25 cm3 = = 0.025 dm3
Density = = 160 kg dm-3 or 160 kg/dm3
Method II
Calculating density in g cm-3
Note: when expressing the density in g cm-3, the kilogram must be changed to gram.
4 kg = 4 x 1000 g = 4000 g
Density = = 160 g cm-3 or 160 g/cm3
Note: Mark is deducted for answer without correct unit
(iii)
Precautions that must be taken to obtain reliable results
1. The object should be dropped gently to avoid splashing the water
2. The volume should be read at the correct meniscus
(b)
Safety precautions to prevent accidents during the use of liquefied petroleum gas in the home
1. Turn the knob off when the cylinder is not in use
2. Keep doors and windows to the kitchen open
3. Cylinders of LPG should be stored preferably in the open air
4. The cylinder should not be exposed to heat/flame
5. Strike match before opening cylinder
(c)
Scientific princible underlying waste management practices:
(i)
Composting
1. Microorganisms in organic matter make use of oxygen
2. and decompose/breakdown organic matter into nutrients
(ii)
Recycling
1. Involves processing/conversion/physically and chemically changing waste materials
2. Into new products
(iii)
Incineration
1. Involves burning of waste materials at high temperatures
2. and converting them into gas/ash to destroy contaminants
(d)
|
Goat Four chambered stomach |
Rabbit One chambered stomach |
3.
a)
State
i)
three characteristics of roots.
ii)
two functions of roots.
b)
State two conditions necessary for the germination of seeds
c)
Describe briefly how the volume of an irregular shaped metal ball could be determined
d)
Write down the chemical formula for each of the following compounds:
i)
sodium chloride
ii)
copper sulphate
iii)
magnesium sulphate
iv)
potassium carbonate
e)
State the method that could be used to separate each of the following compounds:
i)
iodine and sand
ii)
ethanol and water
a)
i)
Characteristics of roots
1. They generally grow into the soil
2. They grow away from light
3. They are usually brownish in colour/possess no chlorophyll
4. Their tips are protected by root caps
5. They bear root hairs
6. They develop from the radicle of the embryo
ii)
Functions of roots
1. They anchor/hold/support the plants firmly in the soil
2. They absorb water and dissolved mineral salts from the soil
3. They store excess food in some plants
4. They are responsible for exchange of gases in some plants in marshy habitats
5. In some plants, the roots are a means of reproduction
6. They transport/send water and mineral salts into the stem
b)
Conditions necessary for the germination of seeds
1. Water/moisture
2. Air/Oxygen
3. Suitable temperature/warmth
4. Viable seed
c)
Determination of the volume of an irregular shaped metal ball
Method I
1. Water is poured into an overflow can until some of the water flows out of the sprout
2. A measuring cylinder is placed under the sprout when the water flow stops
3. The ball is lowered gently into the can by means of a piece of string tied to it
4. The ball displaces its volume of water which flows out the can into they cylinder
5. They volume of the water is read off from the cylinder
6. The volume recorded on the cylinder is the volume of the irregular shaped metal ball
Method II
1. A measuring cylinder is filled with water to a suitable level and the volume is recorded as V1
2. A thread is tied around the irregular shaped metal ball
3. The ball is gently lowered into the water inside the cylinder and the new volume is recorded as V2
4. The volume of the irregular shaped metal ball = (V2 - V1) cm3
d)
i)
sodium chloride → NaCl
ii)
copper sulphate → CuSO4
iii)
magnesium sulphate → MgSO4
iv)
potassium carbonate → K2CO3
e)
Methods of separation
i)
iodine and sand → Sublimation
ii)
ethanol and water → Distillation
4.
(a)
(i)
What is indiscriminate sex?
(ii)
Give two reasons why teenagers indulge in indiscriminate sex.
(b)
Name two sources each of
(i)
natural light;
(ii)
artificial light.
(c)
State three ways in which soil texture is important in crop production.
(d)
Write down the systematic name of each of the following chemical compounds:
(i)
FeS;
(ii)
CO;
(iii)
Cu2O;
(iv)
NaOH.
(a)
(i)
Indiscriminate sex is the act of having sexual intercourse with any person or having many/multiple/different sexual partners.
(ii)
Reasons why teenagers indulge in indiscriminate sex
1. Peer pressure
2. Lack of parental guidance
3. Poor financial status of parents/poor homes
4. Lack of sex education
5. Weak morals/exposure to pornographic material
(b)
(i)
Sources of natural light
1. Sun
2. Fireflies
3. Stars
4. Lightening
5. Glow worm
6. Volcano
Note: the moon is not a source of natural light
(ii)
Sources of artificial light
1. Heated filament/electric bulb
2. Firecrackers
3. Torchlight/flashlight
4. Buring charcoal
5. Lantern
6. Satellite
7. Wood fire
8. Lamp
(c)
Ways in which soil texture is important in crop production
1. It helps the farmer to know the type of farming method to use
2. It has an effect on water and air relationship
3. It influences the soil temperature
4. It influences the water holding capacities of the soil
5. Knowledge of soil texture is important in determining soil management practices to adopt
6. It helps the farmer to know the type of crop to plant
(d)
Systematic name of chemical compounds:
(i)
FeS → Iron (II) sulphide
(ii)
CO → Carbon (II) oxide
(iii)
Cu2O → Copper (I) oxide
(iv)
NaOH → Sodium hydroxide
5.
(a)
Draw and label a diagram to show how the eclipse of the sun is formed.
(b)
(i)
What is a lever?
(ii)
Classify the following as first class lever, second class lever or third class lever by copying and completing the table below:
Beam balance, crowbar, wheel barrow, a pair of scissors, claw hammer, sugar tong, human fore-arm and bottle opener
| First class lever | Second class lever | Third class lever |
(c)
(i)
What is pollination?
(ii)
Give two agents of pollination.
(d)
Name three excretory organs and the products they excrete.
(e)
(i)
What is an alloy?
(ii)
What are the compositions of each of the following alloys?
Bronze, Brass, Steel and Duralumin
(f)
Sodium chloride is prepared by the reaction between dilute hydrochloric acid and sodium hydroxide solution. Write down the equation for this reaction.
(a)
(b)
(i)
A lever is a simple machine which consists of a rigid bar/rod free to turn about a fixed turning point called the fulcrum/pivot.
(ii)
| First class lever | Second class lever | Third class lever |
|
Crowbar
|
Wheel barrow
|
Sugar tong
|
(c)
(i)
Pollination is the transfer of pollen grains from the anther of a flower to the stigma of the flower or another flower of the same species.
(ii)
Agents of pollination
1. Wind
2. Animal (Birds, Bats, Man)
3. Insect
4. Water/Rain
(d)
| Excretory Organs | Excretory Products |
| Skin | Sweat/water and salt/water and urea |
| Kidney | Urine/urea/water and salt |
| Lungs | Carbon dioxide/water vapour |
| Liver | Bile pigments |
(e)
(i)
An alloy is a uniform/homogeneous mixture of a metal and another metal or a non-metal.
(ii)
Compositions of alloys
Bronze → Copper and Tin
Brass → Copper and Zin
Steel → Iron and Carbon
Duralumin → Aluminium, Magnesium, Copper and Manganese
(f)
NaOH + HCl → NaCl + H2O
6.
(a)
In an experiment, a pupil took two empty Milo tins and made holes in their sides as shown in the diagram above. The pupil then filled the Milo tins with water.
(i)
Draw and label the diagrams to show what the pupil will observe in set-up A and set-up B.
(ii)
Explain the observations in set-up A and set-up B.
(iii)
What is the aim of set-up A?
(iv)
What is the aim of set-up B?
(b)
In an experiment, equal volumes of dilute hydrochloric acid (Solution A) and dilute sodium hydroxide (Solution B) are mixed together to form solution C.
(i)
What is the volume of solution C?
(ii)
Red litmus paper and blue litmus paper are dipped in turns into solutions A, B and C.
State the observations you will make in all six cases.
(iii)
Give the name of the reaction that took place between solution A and solution B.
(iv)
Identify solution C
(v)
State what will happen when solution C is heated.
(c)
The table below gives the steps that were followed in an experiment to test for starch in a green leaf freshly taken from a tree.
| Stages in the test for starch |
|
I. Leaf is put into boiling water for 1 minute II. Leaf is dipped in alcohol warmed in a hot water bath III. Leaf is washed in cold water IV. Leaf is dipped into iodine solution |
(i)
State the reason for carrying out each of the activities in stages I, II and III.
(ii)
What happens when the leaf is dipped in iodine solution?
(iii)
Give the colour changes of the leaf from the beginning of the experiment to the end of the experiment.
(iv)
Why is the alcohol warmed indirectly in a water bath?
(vi)
Explain what will be observed if the test is carried out on a leaf taken from a plant kept in a dark room for 1 day
(a)
(i)
(ii)
Observations in set-up A
The pressure of the water coming out of the lower hole is higher than the one at the top.
Observations in set-up B
The pressures of the water coming out of the holes are the same because they are at the same level.
(iii)
The aim of set-up A is to show that pressure increases with depth in a liquid.
(iv)
The aim of set-up B is to show that pressure at the same point/level in a liquid is the same.
(b)
(i)
The volume of solution C = Volume of solution A + Volume of solution B
The volume of solution C = 20 cc + 20 cc
The volume of solution C = 40 cc
(ii)
| Solution | Red Litmus | Blue Litmus |
| Solution A | No change in colour/remains red | Turns red |
| Solution B | Turns blue | No change in colour/remains blue |
| Solution C | No change in colour/remains red | No change in colour/remains blue |
(iii)
Neutralization reaction
(iv)
Sodium chloride solution/NaCl solution/salt solution/brine
(v)
The water evaporates leaving solid sodium chloride/NaCl
OR
Solid sodium chloride/NaCl/common salt is formed
OR
Solution becomes concentrated
(c)
(i)
I → to stop further starch formation/stop photosynthesis process/kill the cells
II → to remove the green pigment/to decolourize the leaf/to remove chlorophyll
III → to soften the leaf
(ii)
Leaf turns blue black
(iii)
Green → colourless/white → blue black
(iv)
The alcohol will catch fire when heated over naked fire.
(vi)
No blue black colour will be seen/colour of iodine will be seen because starch is absent.