KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Which of the following animals can live both in water and on land?
A.
Mouse
B.
Rat
C.
Frog
D.
Grasscutter
E.
Mud fish
Answer: C
2.
The reaction between hydrochloric acid and sodium hydroxide produces
A.
sodium oxide only.
B.
sodium chloride only.
C.
sodium oxide and water.
D.
sodium chloride and water.
Answer: D
3.
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
4.
Which of the following diseases can be caused by a housefly?
A.
Dysentery
B.
Elephantiasis
C.
Scabies
D.
Sleeping sickness
Answer: A
5.
One best way of making water safe for drinking is by
A.
adding washing soda.
B.
filtering.
C.
adding common salt.
D.
boiling.
Answer: D
6.
A patient with symptoms of diarrhoea and vomiting may be suffering from
A.
cholera.
B.
dysentery.
C.
influenza.
D.
tuberculosis.
Answer: A
7.
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
8.
Which of the following diseases is spread by a mosquito?
A.
Blindness
B.
Cholera
C.
Dysentery
D.
Elephantiasis
Answer: D
9.
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
10.
Which of the following pairs of diseases can be spread easily when food is exposed to houseflies?
A.
Cholera and Guinea Worm
B.
Dysentery and Malaria
C.
Dysentery and Guinea Worm
D.
Malaria and tuberculosis
E.
Dysentery and cholera
Answer: E
11.
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
12.
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
13.
Salt could be obtained from sea water by
A.
boiling
B.
condensation
C.
decantation
D.
distillation
E.
evaporation
Answer: E
14.
Am example of soil micro-nutrients is
A.
copper.
B.
calcium.
C.
phosphorus.
D.
potassium.
Answer: A
15.
A beak and claws are protective structures of a
A.
crab.
B.
hawk.
C.
lion.
D.
snake.
Answer: B
16.
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%
17.
The main reason why food is processed is to make it
A.
taste better.
B.
preservable for a longer period.
C.
possible to eat without cooking.
D.
richer in nutrients.
Answer: B
18.
Which of the following substances are carried by the blood?
I. Hormones
II. Urine
III. Oxygen
IV. Carbon dioxide
A.
I and III only
B.
II and III only
C.
I, II and IV only
D.
I, III and IV only
Answer: D
19.
Which of the following activities are involved in the rearing of tilapia?
I. Feeding of fish
II. Pond stocking
III. Pest control
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: A
20.
The best method for checking erosion on a slope is
A.
cover cropping.
B.
mixed cropping.
C.
contour ploughing.
D.
mulching.
Answer: C
21.
A smaller heavenly body, which orbits a bigger one could be described as a
A.
comet.
B.
meteor.
C.
moon.
D.
sun.
Answer: C
22.
Which of the following pairs of organs are part of the central nervous system?
A.
Spinal cord and the eyes
B.
Brain and spinal cord
C.
Brain and the ears
D.
Eyes and the ears
E.
Eyes and brain
Answer: B
23.
Arteries are blood vessels which carry
A.
blood to the heart.
B.
carbon dioxide to the air.
C.
blood away from the art.
D.
oxygen to the lungs.
Answer: C
24.
The farming system which involves the growing of one type of crop on the same piece of land every season is known as
A.
mixed cropping.
B.
mixed farming.
C.
monocropping.
D.
monoculture.
Answer: C
Difference between monocropping and monoculture
Monocropping involves continuously planting the same crop for multiple seasons, while monoculture is planting a field with a single crop for a season. An organic farm may choose to grow only squash plants in one field—this is monoculture. But next season, they instead plant only kale in that same field.
25.
One advantage of friction is that it
A.
enables cutting tools to be sharpened.
B.
increases the efficiency of machines.
C.
produces a lot of heat in machines.
D.
wears off the sole of shoes.
Answer: A
26.
Which of the following types of water would be most contaminated by waste substances?
A.
Rain water
B.
Stream water
C.
Borehole water
D.
Pipe borne water
Answer: B
27.
The linear sequence of living things feeding and being fed on is called
A.
linear feeding
B.
food chain
C.
photosynthesis
D.
nutrition
E.
transpiration
Answer: B
28.
The grouping together of many stars is known as
A.
comet.
B.
astronomy.
C.
solar-system.
D.
galaxy.
Answer: D
29.
Insects can walk on the surface of water because of
A.
diffusion
B.
capillarity
C.
viscosity
D.
friction
E.
surface tension
Answer: E
30.
The farming practice which would improve soil fertility is
A.
clean weeding.
B.
crop rotation.
C.
continuous cropping.
D.
mono cropping.
Answer: B
Importance of crop rotation
1. Increases soil fertility/Adds nitrogen to soil
2. Enhances soil structure
3. Prevents soil erosion
4. Improves soil nutrients and nutrient uptake regulation
5. Controls the spread of pests and diseases
6. Controls weed easily
7. There is effective use of the land
8. Harvest of different types of crops on the same piece of land
31.
Chinchilla is a breed of
A.
goats.
B.
pigs.
C.
rabbits.
D.
sheep.
Answer: C
32.
The process of increasing the strength of a signal using a transistor is known as
A.
amplification.
B.
biasing.
C.
doping.
D.
switching.
Answer: A
33.
The type of energy obtained when an electric bulb is connected to a batter is
A.
chemical energy.
B.
electrical energy.
C.
light energy.
D.
magnetic energy.
Answer: C
34.
An atom has 5 protons and 5 neutrons in its nucleus. How many electrons are present in the atom?
A.
1
B.
2
C.
5
D.
9
E.
10
Answer: C
In a neutral atom, the number of protons is equal to the number of electrons.
35.
The S.I unit for density is
A.
ms-1
B.
ms-2
C.
kg m-3
D.
m3kg-1
Answer: C
36.
Which of the following types of soil allows the fastest rate of drainage?
A.
Clayey soil
B.
Loamy soil
C.
Black soil
D.
Sandy soil
E.
Humus
Answer: D
37.
An example of a parasite which lives in the intestine of an animal is
A.
guinea worm.
B.
jigger.
C.
plasmodium.
D.
tapeworm.
Answer: D
Tapeworm
Tapeworms (taeniasis) are a type of parasite that live in the intestines of animals.
Humans can become infected by eating or drinking tapeworm eggs or larvae (immature tapeworms) in contaminated meat or water.
38.
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.
39.
The part of the plant where pollination occurs is the
A.
flowers.
B.
leaves.
C.
roots.
D.
stems.
Answer: A
40.
A torchlight derives its energy from
A.
petrol
B.
kerosene
C.
a magnet
D.
gas oil
E.
a dry cell
Answer: E
THEORY QUESTIONS
1.
(a)
State four ways by which plants are able to protect themselves against animals.
(b)
(i)
Define pollination.
(ii)
List four features of insect pollinated flowers.
(c)
An atom has three protons and three neutrons.
(i)
How many electrons are there in this atom?
(ii)
Draw a labeled diagram to show the arrangement of all the particles in the atom.
(d)
A body of mass 12.0 kg is placed on an orange tree 20.0 m above the ground
(i)
Calculate its potential energy with respect to the ground
(ii)
If the body is released from this height, what will be its kinetic energy just before it hits the ground.
[g = 10 ms-2]
(a)
Ways by which plants protect themselves against animals
1. Secretion of unpleasant liquids which make them distasteful
2. Possession of poisonous parts which cause pain/itching/death/swelling on contact
3. Possession of spines/thorns/irritating hairs which cause pain/irritation on contact
4. Possession of sticky substances which stick in the mouth of animals which try to feed on them
5. Possession/production of unpleasant smell/scent which drives off animals which try to feed on them
(b)
(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)
Features of insect pollinated flowers
1. Petals are large
2. Petals are brightly coloured
3. The flower is usually scented
4. The flower has nectar
5. Stigma is inside the flower
6. Stigma is compact and sticky
7. Pollen grains produced per anther are few
8. Pollen grains are sticky, large, rough and heavy
9. Filaments are short and stout
(c)
(i)
Number of protons = 3
Number of neutrons = 3
Number of electrons = Number of protons
Number of electrons = 3
(ii)
(d)
(i)
Potential energy = Mass (m) x Acceleration due to gravity (g) x Height (h)
Mass = 12.0 kg
Acceleration due to gravity (g) = 10 ms-2
Height = 20 m
Potential energy = 12.0 kg x 10 ms-2 x 20 m
Potential energy = 2400 J
(ii)
Before the body just hit the ground, the potential energy is converted to kinetic energy
∴ Kinetic energy = Potential energy
Kinetic energy = 2400 J
2.
(a)
(i)
Explain heredity
(ii)
Give two examples of heredity characters.
(b)
Explain whether each of the following processes is a chemical change or a physical change:
(i)
Rusting;
(ii)
Burning;
(iii)
Filtration;
(iv)
Expansion of copper.
(c)
(i)
What is a simple machine?
(ii)
Name two types of simple machines.
(iii)
Explain why the efficiency of a machine cannot be equal to 100%.
(a)
(i)
Heredity is the process in which offsprings acquire characteristics from their parents through the genes they receive from them.
(ii)
Examples of heredity characters
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
13. Sex
(b)
Chemical change and physical change:
(i)
Rusting
Chemical change because a new substance (rust) different from iron is formed.
(ii)
Burning
Chemical change because the ash cannot be turned back easily into the original material.
(iii)
Filtration
Physical change because the components can be gotten easily.
(iv)
Expansion of copper
Physical change because the original shape of the copper can be gotten easily.
(c)
(i)
Simple machine is a device that can be used to make work easier or faster.
OR
Simple machine is a device on which a force/an effort is applied at one point to overcome another force/load at another point.
OR
Simple machine is a device which enables a small force (effort) to overcome a large force (load).
(ii)
Types of simple machines
1. Levers
2. Inclined plane
3. Pulley
4. Wheel and axle
5. Screw
6. Wedge
7. Gears
(iii)
Why the efficiency of a machine cannot be equal to 100%
Part of the work put in the machine to overcome the load is used to overcome friction/weight of machine parts/force of gravity/air resistance so that the work output is always less than the work input.
3.
(a)
Copy the table below and write the usual host of each of the parasites given in the spaces provided.
| Parasite | Host |
| Plasmodium | |
| Capsids | |
| Tapeworm | |
| Dodder |
(b)
(i)
Name three classes of food
(ii)
For each of the following food substances, give the major class of food to which it belongs:
Starch, milk, margarine, sugar
(c)
Write the chemical formula for each of the following compounds:
(i)
calcium hydroxide
(ii)
zinc chloride [zinc (II) chloride]
(iii)
sodium nitrate [sodium trioxonitrate (V)]
(iv)
calcium carbonate [calcium trioxocarbonate (IV)]
(v)
potassium sulphate [potassium tetraoxosulphate (VI)]
(d)
(i)
Define the term viscosity
(ii)
Describe an experiment you performed to compare the viscosities of two liquids A and B.
(a)
| Parasite | Host |
| Plasmodium | Man |
| Capsids | Cocoa plant |
| Tapeworm |
1. Cow
|
| Dodder | Milk bush |
(b)
(i)
Classes of food
1. Carbohydrates
2. Proteins
3. Fats and oils
4. Vitamins
5. Mineral salts
6. Water
(ii)
Starch → Carbohydrate
Milk → Protein
Margarine → Fat and oil
Sugar → Carbohydrate
(c)
(i)
calcium hydroxide → Ca(OH)2
(ii)
zinc chloride [zinc (II) chloride] → ZnCl2
(iii)
sodium nitrate [sodium trioxonitrate (V)] → NaNO3
(iv)
calcium carbonate [calcium trioxocarbonate (IV)] → CaCO3
(v)
potassium sulphate [potassium tetraoxosulphate (VI)] → K2SO4
(d)
(i)
Viscosity is defined as the internal force that opposes the movement of liquid molecules.
(ii)
An experiment to compare the viscosities of two liquids A and B
1. Liquid A and B are both poured into two separate identical measuring cylinders to the same level
2. Two identical metal balls are dropped into each of the measuring cylinders and the time taken for each ball to reach the bottom/base of the cylinders of liquids A and B are recorded
3. The liquid in which the metal ball took a longer time to reach the base/bottom of the measuring cylinder is more viscous
4.
(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
5.
(a)
(i)
What is pollution?
(ii)
Name two types of pollution. For each type, give one pollutant and its source.
(b)
(i)
Explain the term vegetative reproduction.
(ii)
Give any two examples of plants that reproduce vegetatively.
(c)
(i)
List the parts of an atom and show the electrical charges of each of the parts.
(ii)
Explain the term work.
(iii)
Distinguish between heat and temperature and give their units.
(a)
(i)
Pollution is the release of toxic/harmful/poisonous substances into the environment.
(ii)
Types of pollution
| Types of pollution | Pollutant | Source |
| Water pollution | Untreated waste discharged into water | Industries |
| Air pollution | Carbon monoxide
Smoke |
Car exhaust |
| Land pollution | Scrap metal containers
Bottles |
Industries
Homes |
(b)
(i)
Vegetative reproduction is a form of reproduction whereby plants produce young ones from growing parts/buds of the parent plant.
(ii)
Examples of plants that reproduce vegetatively
1. Potato
2. Yam
3. Cocoyam
4. Canna lily
5. Onion
6. Plantain
7. Banana
8. Ginger
9. Pineapple
10. Bryophyllum
11. Sugar cane
12. Cassava
13. Fern
14. Elephant grass
15. Tiger nuts
16. Garlic
(c)
(i)
Parts of an atom and their electrical charges
| Part | Charge |
| Proton | + |
| Electron | -1 |
| Neutron | 0 |
(ii)
Work is said to be done when the point of application of a force moves an object through a distance in the direction of the force.
OR
Work is said to be done when a force moves a body through a distance in the direction of the force.
OR
Work is the product of force and the distance moved in the direction of the force.
OR
Work = Force x distance moved in the direction of the force
(iii)
Differences between heat and temperature
Heat is the energy which causes rise in temperature of bodies while temperature is the degree of hotness or coldness of a body.
The unit of heat is joules and temperature is kelvin or degree celsius
6.
(a)
(i)
Name the two elements that combine to form water.
(ii)
Write a balanced chemical equation to show how the water is formed from the named elements.
(b)
State two ways of maintaining a balance in an ecosystem.
(c)
(i)
What is a fertile soil?
(ii)
State two factors that cause loss of soil fertility.
(d)
Classify the following items as magnetic or non-magnetic substance: wood, steel blade, rubber and glass jar.
(a)
(i)
Elements that combine to form water
1. Hydrogen
2. Oxygen
(ii)
2H2 + O2 → 2H2O
OR
H2 + O2 → H2O
(b)
Ways of maintaining a balance in an ecosystem
1. Avoid overgrazing
2. Pollution of environment must be avoided
3. Avoid deforestation or re-planting of trees/aforestation
4. Indiscriminate hunting of animals should be avoided
5. Farmers should be educated and closely monitored on the use of agro-chemicals
6. Fishermen should use right fishing net for fishing
7. Encroaching on wetlands or forests by people should be avoided
8. Mining activities should be modernized to avoid destruction habitat for organisms
9. Avoid bush burning
(c)
(i)
Fertile soil is a soil that has essential nutrients to support the growth/development of crops.
OR
Fertile soil is a soil that has an abundance of plant nutrients/minerals orgamic matter to support plant growth.
OR
Fertile soil is a soil which contains all the major nutrients for basic plant nutrition as well as others to support plant growth.
OR
Fertile soil is a soil which is able to provide all essential plant nutrients in available forms and in a suitable balance to support plant growth.
(ii)
Factors that cause loss of soil fertility
1. Soil erosion
2. Leaching
3. Bush burning
4. Continuous cropping or monoculture
5. Deforestation
6. Overgrazing
7. Illegal mining
8. Soil acidification/salinization/alkanization
9. Inefficient soil management practices
10. Soil pollution/indiscriminate use of agro-chemicals
(d)
Classification of items as magnetic or non-magnetic substance
Wood → Non-magnetic
Steel blade → Magnetic
Rubber → Non-magnetic
Glass jar → Non-magnetic