KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
An electric bulb is rated 0.5 A, 120 V. Determine the power produced when the bulb is turned on.
A.
60 kW
B.
60 W
C.
30 kW
D.
30 W
Answer: B
Electric Power Formula
Power = Current(I) x Potential Difference/Voltage(V)
P = IV
Current (I) = 0.5 A =
Potential Difference/Voltage(V) = 120V
Power = x 120 W = 60 W
2.
The embryo of a mammal develops from
A.
eggs fertilized inside the body.
B.
eggs fertilized outside the body.
C.
self fertilized eggs.
D.
only female sex cells.
Answer: A
3.
Which of the following is a rhizome?
A.
Potato
B.
Ginger
C.
Onion
D.
Cocoyam
E.
Cassava
Answer: B
4.
Which of the following liquids would turn blue litmus paper red?
A.
Vinegar
B.
Water
C.
Ammonia solution
D.
Bicarbonate solution
Answer: A
5.
An entrepreneur's decision as to what to produce is a/an
A.
co-ordinating function
B.
organizing function
C.
planning function
D.
supervising function
Answer: C
6.
When the brakes of a bicycle in motion are applied for a long time the wheels become hot. This is because of a change of energy from
A.
kinetic energy to potential energy.
B.
potential energy to kinetic energy.
C.
potential energy to heat energy.
D.
kinetic energy to heat energy.
Answer: B
Kinetic energy is the energy a body possesses by virtue of being in motion
Potential energy is the energy a body possesses by virtue of its position relative to other objects.
Heat is the transfer of energy from a high-temperature body to a lower-temperature one.
7.
A substance of mass 10 kg has a density of 2.0 kgm-3. Calculate its volume.
A.
0.2 m3
B.
5.0 m3
C.
10.0 m3
D.
20.0 m3
Answer: B
Density =
Density x Volume = Mass
Dividing both sides by Density
Volume =
Volume =
Volume = 5 m3
8.
The importance of fuse in an electrical circuit is to
A.
regulate the voltage.
B.
prevent damage to electrical appliances.
C.
alter the flow of current in the circuit.
D.
minimize the use of current.
Answer: B
9.
Which of the following statements about bush fires is/are true?
I. They cause air pollution
II. They deplete vegetation cover
III. They contribute to global warming
A.
I only
B.
II only
C.
II and III only
D.
I, II and III
Answer: D
10.
A load of 10 N is moved through a distance of 2 m. Calculate the work done.
A.
5 J
B.
10 J
C.
20 J
D.
50 J
Answer: C
Work done = Force x Distance
Force = 10 N
Distance = 2 m
Work done = 10 N x 2 m
Work done = 20 J
11.
Which of the following animals reproduces without mating?
A.
Toad
B.
Lizard
C.
Dog
D.
Man
E.
Amoeba
Answer: E
12.
Steel is an alloy of
A.
Iron and Carbon
B.
Zinc and Copper
C.
Tin and Copper
D.
Iron and Zinc
E.
Carbon and Zinc
Answer: A
13.
Gold is usually used to make jewellery because it is
A.
precious.
B.
expensive.
C.
less reactive with air.
D.
a good conductor of heat.
Answer: C
14.
Which of the following practices in the home can prevent disease infection?
A.
Covering one's food
B.
Drinking unclean water
C.
Keeping one's surrounding untidy
D.
Sharing towels and sponges
Answer: A
15.
The SI unit that is derived is
A.
kg.
B.
k.
C.
Pa.
D.
s.
Answer: C
Derived unit is a unit obtained from the base/fundamental unit. Pa is a unit for pressure which is obtained from kg⋅m−1⋅s−2
16.
Caterpillar is an example of
A.
an animal parasite that feeds on plant host.
B.
a plant parasite that lives on an animal host.
C.
an animal parasite that feeds on animal host.
D.
a plant parasite that grows on plant host.
Answer: A
CATERPILLAR PARASITE
17.
The study of the soil profile of an area helps the farmer to
A.
control weed growth
B.
determine the soil temperature
C.
determine the types of crop to grow
D.
know the pesticides to use
Answer: C
18.
Which of these is not a sense organ?
A.
Eye
B.
Ear
C.
Nose
D.
Skin
E.
Heart
Answer: E
19.
Which of the following is a function of prop roots? They
A.
Store starch in the swollen branch roots
B.
Take in air for respiration
C.
Hold the plant more firmly in the soil
D.
Develop into storage roots
E.
Develop into fibrous roots
Answer: C
20.
The term leaching in soils refers to .....
A.
accumulation of organic matter
B.
decomposition of plant material
C.
fixation of nitrogen
D.
removal of soil nutrients by water
Answer: D
21.
Which of the following organisms causes bilharziasis?
A.
Blood fluke
B.
Bloodworm
C.
Liver fluke
D.
Roundworm
E.
Tapeworm
Answer: A
22.
Which of the following gases helps in rusting?
A.
Carbon dioxide
B.
Hydrogen
C.
Oxygen
D.
Nitrogen
Answer: C
The rusting of iron (Fe) is shown by the chemical equation below:
4Fe + 3O2 + 6H2O → 4Fe(OH)3
23.
Which of the following is true about a first class lever?
A.
The load is between the effort and the pivot
B.
The pivot is between the effort and the load
C.
The effort is between the pivot and the load
D.
The load is on the pivot
E.
There is no pivot
Answer: B
24.
Which of the following bodies are natural sources of light?
I. Moon
II. Sun
III. Firefly
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: C
Moon doesn't have its own light and it either reflects or refracts the light of the sun. Hence it can be said that the moon is not the natural source of light.
25.
Plants with thorns are not usually eaten by animals. The thorns therefore
A.
assist the plants to grow
B.
make the plant strong
C.
render the plant poisonous
D.
protect the plant
E.
make the plant unattractive
Answer: D
26.
Which of the following substances is not a constituent of a balanced diet?
A.
Carbohydrate
B.
Protein
C.
Table salt
D.
Vitamins
Answer: C
27.
The outer ear consists of the
A.
ossicles and eardrum.
B.
cochlea and pinna.
C.
ossicles and cochlea.
D.
pinna and eardrum.
Answer: D
28.
In electronic circuits, LEDs are used to indicate the absence or presence of
A.
emitter and collector
B.
electric current
C.
p-n junction
D.
voltage source
Answer: B
29.
Canned foods and drinks have expiry dates on them. The hazard involved in taking an expired drink is
A.
food poisoning.
B.
impaired hearing.
C.
poor circulation of blood.
D.
suffocation.
Answer: A
30.
Non-reactive metals are preferred in making ornaments and jewellery because they
A.
are attractive.
B.
do not react with atmospheric oxygen.
C.
do not retain their luster.
D.
are corrosive.
Answer: B
31.
An object is placed 20 cm in front of a plane mirror. The distance between the object and the image is
A.
20 cm.
B.
40 cm.
C.
60 cm.
D.
80 cm.
Answer: B
Characteristics of image formed by a plane mirror
1. The image formed by a plane mirror is virtual and erect.
2. The image formed by a plane mirror is of the same size as the object.
3. The image is formed behind the mirror and the distance of the image from the mirror is equal to the distance of the object from the mirror.
Distance between the object and the image = Object distance + image distance
Distance between the object and the image = 20 cm + 20 cm = 40 cm
32.
Which of the following organisms is a parasite on plants?
A.
Bee
B.
Butterfly
C.
Capsid
D.
Red ant
E.
Tick
Answer: C
33.
One of the properties of acids is that they
A.
turn wet blue litmus paper red.
B.
have no effect on blue litmus paper.
C.
turn wet red litmus paper blue.
D.
are neutral to litmus paper.
Answer: A
Testing for acid
Blue litmus paper will turn red in acid solutions and red litmus blue in base solutions.
34.
Which of the following is the percentage composition of oxygen in the air?
A.
0.03
B.
1
C.
21
D.
78
E.
98
Answer: C
35.
Which of the following chemical equations is the correct representation of the preparation of carbon dioxide?
A.
CaCO3 + 2HCl → CaO + Cl2 + H2 + CO2
B.
CaCO3 + 2HCl → CaCl2 + H2CO3
C.
CaCO3 + 2HCl → CaO + Cl2 + H2O + CO
D.
CaCO3 + 2HCl → CaCl2 + H2 + CO2
E.
CaCO3 + 2HCl → CaCl2 + H2O + CO2
Answer: E
36.
By the end of digestion, lean meat is turned into
A.
amino acids
B.
fatty acids
C.
glycerol
D.
glucose
E.
sugar
Answer: A
37.
The type of cloud found closest to the earth's surface is
A.
cirrus.
B.
cumulus.
C.
stratus.
D.
stratocumulus
Answer: C
38.
Farmers do not plant the stems of maize because the stems
A.
do not have buds.
B.
are difficult to obtain.
C.
dry up too quickly.
D.
do not contain food.
Answer: A
39.
Dissolved mineral salts from the soil enter the plant by the process of
A.
phototropism
B.
transpiration
C.
diffusion
D.
osmosis
E.
ingestion
Answer: C
40.
The structure which helps a fish to breath under water is the
A.
gill.
B.
air sac.
C.
operculum.
D.
mouth.
Answer: A
THEORY QUESTIONS
1.
a)
In an experiment the surfaces of three iron nails were cleaned dry and placed in three separate test tubes A, B and C as shown in the diagram.
Study the diagram carefully and answer the questions that follow.
After three days the nail in the test tube A was found to have rusted while the nail in test tubes B and C did not rust.
i)
Suggest an aim for the experiment.
ii)
Why was the water in test tube B boiled?
iii)
State the function of the oil on top of the water in test tube B.
iv)
What is the purpose of the calcium chloride in test tube C?
v)
Why did the nail in test tube A rust?
vi)
Why did the nail in test tube
α)
B not rusted?
β)
C not rusted?
vii)
From the experiment, explain why oil is applied on the surface of a metal to prevent rusting.
b)
In an experiment, the following activities were carried out on two green leaves A and B.Leaf A was taken from a plant placed in the sunlight for some time while leaf B was taken from a plant placed in a dark cupboard for 24 hours.
Activity
I. Leaves dipped in boiling water for 1 minute;
II. Leaves dipped in warm alcohol;
III. Leaves washed in cold water;
IV. Leaves dipped in iodine solution.
After dipping in the iodine solution, it was observed that leaf A changed colour.
Study the activities carefully and answer the questions that follow.
i)
Suggest an aim for the experiment.
ii)
Explain briefly why each of the following activities were carried out:
(α) I;
(β) II;
(γ) III.
iii)
State the colour change of leaf A.
iv)
Explain why leaf A changed colour?
v)
Why is it necessary to de-starch the plant before starting the experiment?
vi)
From the above experiment, what conclusion(s) can be drawn.
c)
You are provided with two dry soil samples A and B, a measuring cylinder, beakers, funnels, filter paper, beam balance, stop watch and water. With the aid of a labelled diagram, describe an experiment to find out which of the two soil samples can hold more water.
d)
The diagram below is an illustration of an experiment that was carried out. In the experiment three pins 1, 2 and 3 were fixed with candle wax onto a metal bar and one end of the bar was heated by means of boiling water. A, B and C are thermometers inserted in holes along the bar to measure the temperature at the various points.
Study the diagram carefully and answer the questions that follow.
i)
Suggest an aim for the experiment.
ii)
What is the temperature of the boiling water?
iii)
State the observation that would be made about the pins 1, 2 and 3.
iv)
State the observation that would be made about the temperatures recorded by the thermometers A, B and C.
v)
State how heat from the sun is transmitted to the earth.
a)
i)
Aim of experiment
Experiment to prove that both air and water are necessary for rusting of iron or experiment to determine the conditions necessary for the rusting of iron.
ii)
Reason for boiling the water in test tube B
To remove dissolved air.
iii)
Function of oil on top of the water in test tube B
The oil prevents the entering of air into the water.
iv)
Purpose of calcium chloride in test tube C
To remove or absorb all the moisture/water vapour present in the air in test tube C.
v)
Reason why the nail in test tube A rusted
Because of the presence of air and water.
vi)
α)
Reason why the nail in test tube B did not rust
Because of the absence of air (Only water was present)
β)
Reason why the nail in test tube C did not rust
Because of the absence of water (Only air was present / air is dry)
vii)
Reason why oil is applied to surface of metal to prevent rusting
It prevent air/moisture from coming into contact with the metal
b)
i)
To prove that sunlight is necessary/important for photosynthesis.
ii)
Reasons for Activity I, II and III
I → To kill cells/stop photosynthesis process.
II → To remove green pigment/chlorophy.
III → To wash off the alcohol/soften the leaf.
iii)
Color change of leaf A
Turned blue-black
iv)
Reason for colour change
Present of starch/starch produced
v)
Reason for de-starching plant
To remove the existing starch from the leaves before the experiment otherwise both leaves would show the presence of starch or the will be no control experiment.
vi)
Conclusion
It can be concluded that sunlight is necessary for the process of photosynthesis.
c)
Experiment to find out which soil sample holds more water
1. The same mass of samples A and B are weighed with a beam balance.
2. Each samples is poured into a separate funnel fitted with a filter paper and placed over a beaker.
3. The same volume of water is measured using the measuring cylinder and poured on each of the soil samples.
4. The water is allowed to drain out completely from each set-up.
5. The soil sample in the set-up with the least drained-out water is the one that can hold more water.
6. The soil sample in the set-up with the most drained-out water is the one that cannot hold more water.
d)
i)
Aim of the experiment
To show that heat (energy) is transferred through metals/solids by conduction
ii)
Temperature of boiling water
100oC
iii)
The pins fall off as the wax melt.
iv)
A will have the highest temperature followed by B and C is the least (Temperature A > Temperature B > Temperature C)
v)
How heat is transmitted from the sun to earth
Heat is transmitted from the sun to the earth through radiation
2.
a)
State one function each of the following parts of the human reproductive system:
i)
Penis;
ii)
Ovary;
iii)
Oviduct;
iv)
Testis;
v)
Uterus;
b)
i)
What is electrical conductor?
ii)
List two substances which are insulators.
c)
State three ways of maintaining soil fertility.
d)
Write word equation for each of the following chemical reactions:
i)
Oxygen and hydrogens;
ii)
Nitrogen and hydrogen;
iii)
Sodium and chlorine.
a)
Functions of the parts of the human reproductive system
i)
Penis
It is used to introduce/discharge sperms into the vagina.
ii)
Ovary
It produces female gametes/sex cells/ova/hormones.
iii)
Oviduct
It is a place where fertilization occurs/passage for the egg released from the ovary to the uterus.
iv)
Testis
Produces sperms/male gametes/sex cells/hormones.
v)
Uterus
Site for implantation/attachment of embryo.
b)
i)
Electrical conductor is any material that will allow electric current through it.
ii)
Insulators
1. Wood
2. Plastic
3. Rubber
4. Mica
5. Porcelain
6. Glass
c)
Ways of maintaining soil fertility
1. Cover cropping
2. Crop rotation
3. Addition of manure/fertilizer/compost
4. Mulching
5. Mixed farming
6. Tillage to improve aeration
7. Bush fallowing
8. Irrigation
9. Alley cropping
d)
Chemical reactions
i)
Oxygen and hydrogens
Hydrogen + Oxygen → Water
OR
Hydrogen + Oxygen → Hydrogen Peroxide
ii)
Nitrogen and hydrogen
Nitrogen + Hydrogen → Ammonia
iii)
Sodium and chlorine
Sodium + Chlorine → Sodium chloride
3.
(a)
Define the following terms and give an example each
(i)
Herbivore
(ii)
Carnivore
(iii)
Omnivore
(b)
Two dry cells connected in parallel are in turn connected in series with a bulb and switch.
Draw a circuit diagram to illustrate this arrangement.
(c)
List four garden tools
(d)
What property of water causes mosquito larvae to float on it?
(e)
Describe an experiment you prepared to show that some part of air is used in burning.
(a)
(i)
Herbivore is an animal that feeds on plants only
Examples: Goat, rabbit, sheep, deer, cow, elephant, giraffe, horse
(ii)
Carnivore is an animal that feeds on the flesh of other animals only
Examples: Lion, wolf, leopard, hyena, polar bear, cat, cheetah, giant panda, felidae, tiger, sharks, venus fly trap
(iii)
Omnivore is an animal that feeds on both plants and animals
Examples: Man, bears, birds, dog, raccoons, fox, certain insects
(b)
(c)
List of garden tools
1. Cutlass
2. Hoe
3. Rake
4. Axe
5. A pair of secateurs
6. Garden fork/digging fork/foot fork
7. Spade
8. Hand trowel
9. Hand fork
10. Watering can
11. Garden shears
(d)
Surface tension
(e)
An experiment to show that some part of air is used in burning
1. Two candles are lighted simultaneously
2. Glass jar is mounted on one of the candles
3. It is observed that after a while, the candle under the inverted glass jar went off because it was no longer supplied with air whiles the other candle without the inverted glass jar kept on burning
4. It can be concluded that some part of air is used in burning
4.
(a)
List the three particles which make up matter.
(b)
State four hereditary features in humans.
(c)
State the energy transformation that takes place in each of the following activities:
(i)
dry cell in use;
(ii)
solar panel in use;
(iii)
electric stove in use;
(iv)
hammering of a piece of metal.
(d)
State two ways each in which each of the following cultural practices is important in vegetable production:
(i)
staking;
(ii)
pruning.
(a)
The three particles which make up matter
1. Atoms
2. Molecules
3. Ions
(b)
Hereditary features in humans
1. Weight
2. Intelligence
3. Colour of the skin
4. Ability to roll the tongue
5. Temperature
6. Height/stature of an individual
7. Colour of eyes
8. Colour of hair
9. Blood group
10. Shape of face/nose/head/eye
11. Haemophilia
12. Albinism
(c)
Energy transformations
(i)
Dry cell in use
Chemical energy → Electrical energy
(ii)
Solar panel in use
Light energy → Electrical energy
(iii)
Electric stove in use
Electrical energy → Heat energy
(iv)
Hammering of a piece of metal
Chemical → Potential → Kinetic → Heat/Light/Sound
OR
Chemical → Mechanical → Heat/Light/Sound
OR
Chemical → Kinetic → Heat/Light/Sound
(d)
(i)
Ways in which staking is important in vegetable production
1. It supports weak/climbing stems
2. Promotes air circulation
3. Allow for easy penetrating of sunlight
4. Helps to produce clean fruits
5. It helps protects fruits from diseases/pest
6. Cultural practices such as weeding and spraying can easily be carried out
7. It facilitates harvesting
8. It reduces/minimuzes/prevents fruits from diseases/rot
9. Improves fruit quality
10. Supports plants during strong winds
(ii)
Ways in which pruning is important in vegetable production
1. It encourages easy harvesting
2. It improves air circulation in the farm
3. It promotes light penetration
4. It checks the spread of diseases
5. It prevents the spread of pests
6. It promotes the production of bigger fruits
7. It beautifies ornamental plants
8. It aids clearing of weeds
5.
(a)
(i)
Give two differences between a vein and an artery.
(ii)
State two functions of red blood cells.
(iii)
Mention two diseases associated with the circulatory system.
(b)
(i)
Classify the following processes into a physical change and a chemical change:
Cooking of food;
Melting of candle;
Melting of ice;
Rusting of iron;
Dissolution of sugar in water;
Burning of wood into ash.
(ii)
Explain the basis of the classification in (b)(i).
(c)
(i)
State the laws of reflection.
(ii)
Draw a ray diagram of light incident at an angle of 40o on the surface of a plane mirror.
(a)
(i)
Differences between a vein and an artery
| Vein | Artery |
| Located close to the surface of the skin | Located deep in the muscles |
| Thin walled | Thick walled |
| Presence of valves | Absence of valves |
| Smaller in size | Bigger in size |
| Blood flows under low pressure/blood flows smoothly | Blood flows under high pressure/flows in pulses |
| Carries blood to the heart | Carries blood away from the heart |
| Carries blood with low oxygen/carries de-oxygenated blood | Carries blood with high oxygen/carries oxygenated blood |
| Has bigger lumen | Has smaller lumen |
| Less elastic wall | More elastic wall |
(ii)
Functions of red blood cells
1. They carry oxygen from lungs to cells
2. They carry carbon dioxide from the cells to lungs
(iii)
Diseases associated with the circulatory system
1. High blood pressure (Hypertension)
2. Low blood pressure (Hypotension)
3. Varicose veins
4. Piles/Haemorrhages
5. Anaemia
6. Leukaemia/blood cancer
7. Arteriosclerosis
8. AIDS
9. Hepatitis
10. Heart failure/Cardiac arrest
11. Sickle cell anaemia
12. Diabetes
13. Stroke
14. Haemophilia
15. Coronary artery disease/Thrombosis
16. Malaria
(b)
(i)
| Physical Change | Chemical Change |
| Melting of candle | Cooking of food |
| Melting of ice | Rusting of iron |
| Dissolution of sugar in water | Burning of wood into ash |
(ii)
Physical and chemical changes
For a physical change,
1. The original substance can be obtained by a reverse process
2. There is no new substance formed
3. No change in mass occurs
4. The individual components retain their properties
5. There is no heat involved
For a chemical change,
1. The original substance cannot be obtained by reversing the process
2. New substances are formed
3. Change in mass occurs
4. Individual components lose their properties
5. There is heat involved
(c)
(i)
Laws of reflection
1. The angle of incidence is equal to the angle of reflection
2. The incident ray, reflected ray and the normal at the point of incidence all lie in the same plane
(ii)
6.
a)
Explain briefly why a tomato plant is likely to wilt if too much fertilizer is applied.
b)
State the dangers involved in each of the following activities in the laboratory:
i)
eating or drinking water in the laboratory;
ii)
walking barefooted;
iii)
washing hands with unknown liquid in a beaker.
c)
A child is found not to be able to see at night.
i)
What deficiency disease may the child be suffering from?
ii)
What food nutrient is the child lacking?
iii)
State three source of food substances that can provide the nutrient that the child lacks.
d)
i)
What is a force?
ii)
Explain briefly why a driver could not stop a car on a slippery section of a road when he applied the brake.
a)
Why tomato plant wilts if too much fertilizer is applied
The solution in the fertilizer become more concentrated than that of the plant when the fertilizer is too much.
Osmosis then occurs (water moves from the plant to the solution in the fertilizer with the higher concentration to equalize the concentration) making the plant to lose water.
b)
i)
Dangers for eating or drinking water in the laboratory
Food/water may be contaminated with poisonous substance which will be harmful to the person when eaten or drank
ii)
Dangers for walking barefooted in the laboratory
A person may be pricked with pieces of broken glasses, pins or slip or get burnt.
iii)
Dangers for washing hands with unknown liquid in a beaker
The liquid may be acidic or corrosive which can cause burns/irritation/injury or harm the person.
c)
i)
Disease for not able to see at night
Night blindness
ii)
Night blindness is caused by difficiency of vitamin A
iii)
Vitamin A food substances
1. Leafy green vegetables such as spinach, orange and yellow vegetables such as carrots or sweet potatoes
2. Tomatoes
3. Mango/Orange/Fruits
4. Beef liver
5. Fish oils
6. Milk
7. Eggs
d)
i)
Force is a push or a pull or that which changes a body's state of rest or uniform motion in a straight line
ii)
Why brake fails on a slippery road
Because there is no friction between the tyres and the road.