KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
The S.I unit for measuring the work done by a force is
A.
J.
B.
K.
C.
N.
D.
W.
Answer: A
2.
Brass is an alloy of
A.
iron and carbon
B.
zinc and copper
C.
iron and copper
D.
copper and tin
Answer: B
3.
The housefly is an agent for the spread of
A.
cholera.
B.
malaria.
C.
measles.
D.
tuberculosis.
Answer: A
4.
A patient has been diagnosed of hypertension. Which of the following readings is most likely the patient's blood pressure?
A.
110/85
B.
120/80
C.
130/85
D.
140/90
Answer: D
Normal blood pressure is generally considered to be less than 120/80 mmHg according to the National Institutes of Health (NIH). Blood pressure readings are expressed as two numbers: systolic (the top number) and diastolic (the bottom number). Systolic pressure measures the force of blood against artery walls when the heart beats, while diastolic pressure measures the force when the heart is at rest between beats.
Hypertension, also known as high blood pressure, is a condition where the force of blood pushing against the artery walls is consistently too high. This can lead to serious health problems if left untreated, such as heart disease, stroke, and kidney disease. High blood pressure is often a silent condition, meaning many people don't experience noticeable symptoms. Hypertension (high blood pressure) is when the pressure in your blood vessels is too high (140/90 mmHg or higher)
5.
Which of the following diseases affects the lungs?
A.
Cholera
B.
Measles
C.
Tetanus
D.
Tuberculosis
E.
Typhoid
Answer: D
6.
Which of the following human activities pollutes the environment?
I. Release of cement dust into the atmosphere
II. Dumping of refuse into water bodies
III. Burning of rubbish
A.
I and II only
B.
II and III only
C.
I and III only
D.
I, II and III
Answer: D
7.
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
8.
Which of the following processes involve a change in the state of matter from liquid to solid?
A.
Evaporation
B.
Freezing
C.
Melting
D.
sublimation
Answer: B
9.
The second stage in the life cycle of a mosquito is the
A.
egg
B.
imago
C.
larva
D.
pupa
Answer: C
10.
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.
11.
Which of the following sources of energy is/are renewable?
I. Wind
II. Coal
III. Crude oil
A.
I only
B.
I and II only
C.
II and III only
D.
I,II and III
Answer: A
Renewable Energy
Renewable energy is defined as energy that is produced by natural resources—such as sunlight, wind, rain, waves, tides, and geothermal heat—that are naturally replenished within a time span of a few years.
A renewable energy source means energy that is sustainable - something that can't run out, or is endless, like the sun.
Sources of Renewable Energy
1. Solar energy
2. Wind energy
3. Hydro energy
4. Tidal energy
5. Geothermal energy
6. Biomass energy
12.
Oxygen in the blood finally reaches the parts of the body through the
A.
arteries.
B.
alveoli.
C.
capillaries.
D.
veins.
Answer: A
13.
Heat is transferred along an iron bar by
A.
absorption.
B.
conduction.
C.
convection.
D.
radiation.
Answer: B
14.
How many states of matter do we have?
A.
2
B.
3
C.
4
D.
5
E.
6
Answer: B
15.
A stick which is partially immersed in water appeared to be bent due to
A.
absorption.
B.
reflection.
C.
refraction.
D.
transmission.
Answer: C
16.
The volume of water in a container rises when a piece of stone is put into the container. The change in the
volume of water is equal to the
A.
mass of the container
B.
mass of the stone
C.
density of the stone
D.
density of the water
E.
volume of the stone
Answer: E
17.
The basic unit of matter is the
A.
atom.
B.
compound.
C.
element.
D.
electron.
E.
ion.
Answer: A
An atom is defined as the smallest unit of matter indivisible by chemical means.
18.
Blood in the urine is a symptom of
A.
bilharzia.
B.
cholera.
C.
gonorrhoe.
D.
typhoid
Answer: A
19.
The chief source of energy in the world today is
A.
coal
B.
crude oil
C.
natural gas
D.
uranium
E.
water
Answer: B
20.
A capacitor is connected in a series circuit with LED, a battery and a switch. When the circuit is closed, the LED
A.
comes on and stays on.
B.
flashes and goes off.
C.
does not come on.
D.
flashes and stays on.
Answer: B
The bulb will light up for an instant when the capacitor starts charging. Initially when key is closed, the capacitor acts as short-circuit, so bulb will light up. But finally the capacitor becomes fully charged, so it will act as open circuit, so bulb will not glow.
21.
Power is defined as the
A.
ability to do work
B.
amount of energy
C.
rate of distance covered
D.
rate of doing work
E.
ease of moving a heavy object
Answer: D
22.
During athletics, a boy slipped on a banana peel on the ground and fell. This is because
A.
There was no friction
B.
The ground was hard
C.
The banana peel was soft
D.
The ground was sandy
E.
The frictional force was too great
Answer: A
23.
One characteristics which is not common to all living things is the ability to
A.
grow.
B.
move about.
C.
respire.
D.
respond to stimuli.
Answer: B
24.
A safety device which opens an electric circuit to prevent too much current from passing through the circuit is the
A.
earth wire.
B.
lightning conductor.
C.
fuse.
D.
switch.
Answer: C
25.
Young rabbits are called
A.
bunnies
B.
cubs
C.
fingerlings
D.
kids
Answer: A
26.
A suitable instrument that could be used to measure the internal diameter of a bamboo flute is
A.
beam balance.
B.
metre fule.
C.
surveyor's tape.
D.
vernier callipers.
Answer: D
27.
The person who studies the weather is
A.
a pilot
B.
a physician
C.
an astronaut
D.
an astrologer
E.
meteorologist
Answer: E
28.
Which of the following is not a way of preventing soil erosion?
A.
Planting trees on bare soil.
B.
Clearing trees along slopes
C.
Planting grasses along slopes
D.
Ploughing across slopes
E.
Preventing bush fire
Answer: B
29.
Which of the following methods of treating water makes it soft?
A.
Addition of alum
B.
Addition of sodium carbonate
C.
Chlorination
D.
Filtration
Answer: B
30.
Which of the following effects is not a result of illegal connection of electricity?
It can
A.
lead to fire outbreak
B.
lead to frequent power cut-off
C.
increase the flow of current in the supply chain
D.
cause damage to electrical appliance
Answer: C
31.
Which of the following human activities maintains the carbon cycle?
A.
Bush burning
B.
Felling of trees
C.
Release of fumes from factories
D.
Replanting of trees felled as timber
Answer: D
32.
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
33.
The instrument used to measure temperature is the
A.
ammeter.
B.
barometer.
C.
manometer.
D.
thermometer.
Answer: D
34.
Chinchilla is a breed of
A.
goats.
B.
pigs.
C.
rabbits.
D.
sheep.
Answer: C
35.
The shedding of leaves by plants during the dry season protects them against
A.
bush fire
B.
cold weather
C.
plant-eating animals
D.
heat loss
E.
water loss
Answer: E
36.
Heat travels through vacuum by
A.
conduction.
B.
convection.
C.
radiation.
D.
convection and radiation.
Answer: C
Conduction → heat transfer in solid
Convection → heat transfer in fluid
Radiation → heat transfer through vacuum
37.
How long does it take the moon to go completely round the earth?
A.
1 day
B.
28 days
C.
30 days
D.
365 days
Answer: B
38.
In mammals, sperms are produced in the
A.
testis
B.
ureter
C.
penis
D.
urethra
E.
ovary
Answer: A
39.
The portion of air which acts as a solvent is
A.
oxygen.
B.
carbon (IV) oxide.
C.
nitrogen.
D.
an inert gas.
Answer: C
Since the concentration of nitrogen (N2) is maximum in air (78%). Hence, the solvent is Nitrogen gas and other gases like Oxygen and other gases act as solute.
40.
All the following are solids except
A.
aluminium
B.
lead
C.
silver
D.
potassium
E.
mercury
Answer: E
THEORY QUESTIONS
1.
a)
i)
What is a hormone?
ii)
Copy and complete the following table.
| Name of hormone | Organ secreting hormone | Function of hormone |
| Adrenalin | ||
| Thyroxin | ||
| Insulin |
b)
Ammonia gas is prepared in the laboratory by heating ammonium chloride and calcium hydroxide.
i)
Write a balanced equation for the reaction.
ii)
How is ammonia gas tested in the laboratory?
iii)
State one use of ammonia.
c)
i)
Name four types of forces.
ii)
A boy used a catapult to kill a bird which was on a tree and it fell to the ground.
Give two forces involved in this process.
a)
i)
Hormones are chemical substances produced by special endocrine/ductless glands in the body to enable certain organs function properly.
ii)
| Name of hormone | Organ secreting hormone | Function of hormone |
| Adrenalin | Adrenal gland | Prepares the body for fear/flight/fright emergency/fight/defense |
| Thyroxin | Thyroid gland | Body metabolism/growth |
| Insulin | Pancreas/Islets of Langerhans | Regulates body sugar level/blood sugar level |
b)
i)
2NH4Cl + Ca(OH)2 → CaCl2 + 2NH3(g) + 2H2O
ii)
How to test for ammonia gas
1. Ammonia turns moist red litmus paper blue
2. Ammonia produces white fumes when it reacts with concentrated hydrochloric acid (HCl)
iii)
Uses of ammonia
1. For preparation of ammonium nitrate/fertilizers
2. Used in the textile industry
3. Used as a laboratory reagent
c)
i)
Types of forces
1. Force of gravity
2. Weight
3. Magnetic force
4. Electrostatic force
5. Frictional force
6. Centripetal force
7. Viscous force
8. Tensional/Elastic force
9. Adhesion
10. Cohesion
11. Centrifugal force
ii)
1. Tensional/Elastic force
2. Force of gravity
3. Frictional force
2.
a)
The diagram below are illustrations of two cells labelled A and B
Study the diagram carefully and answer the questions that follow.
i)
Name each of the parts labelled I, II, III and IV.
ii)
Which of the parts named in (a)(i) is the same as the parts labelled VI and IX in cell B?
iii)
Which of the cells is a plant cell?
iv)
Give two reasons for the answer given in (a)(iii).
v)
Tabulate two differences between the parts labelled I and V.
b)
The diagram below is an illustration of an experiment carried out in the laboratory.
Study the diagram carefully and answer the questions that follow.
i)
Read and record the:
(α) mass of irregular object (M) in I
(β) Volume of water (V1) in II
(γ) Volume of water (V2) in III
ii)
Determine the volume of the irregular object.
iii)
Calculate the density of the irregular object.
iv)
Name the instrument that could be used to measure the mass of an irregular object.
v)
State one precaution to be taken in performing the experiment.
c)
The following activities were performed in the laboratory by groups of pupils.
Study the activities and answer the questions that follow.
i) Camphor was heated.
ii) Wood was burnt.
iii) Iron nails were heated strongly.
iv) Sodium chloride was dissolved in water.
i)
Which of the following activities are:
(α) chemical processes;
(β) physical processes.
ii)
Give two reasons why the activities listed in:
(α) (i)(α) are chemical processes;
(β) (i)(β) are physical processes.
iii)
Give two examples of physical change that take place in your environment.
d)
A farmer cultivated soya bean, yam and maize on a farm in a rotational programme as illustrated below.
Study the diagram carefully and answer the questions that follow.
i)
Copy and complete the table.
ii)
List three principles to consider when planning this rotational programme.
iii)
Give two reasons for selecting the crop named for V in plot 1 year 3.
iv)
State one advantage of practising this farming system.
a)
(i) I = cell/plasma membrane, II = cytoplasm, III = nucleus , IV = vacuole
(ii) I is the same as VI (Cell membrane) and IV is the same as IX (Vacuole)
(iii) Diagram B
iv)
Reasons
1. Presence of large/ single vacuole (IX)
2. Presence of cell wall (V)
3. Rectangular shape
4. Nucleus pushed to the side/periphery
5. Cytoplasm pushed to the side
v)
Differences between parts labelled I (Cell Membrane) and V (Cell Wall)
| I (Cell Membrane) | V (Cell Wall) |
| Present in all types of cells, in humans, animals, plants, bacteria, etc. | Present only in plants and in some fungi, bacteria, algae. |
| Semi-permeable | Completely or fully permeable |
| Flexible | Thick and rigid |
| Made up of proteins and lipids | Made up of cellulose |
b)
i)
(α) mass of irregular object (M) in I = 40 g
(β) Volume of water (V1) in II = 40 cm3
(γ) Volume of water (V2) in III = 60 cm3
ii)
Volume of the irregular object = 60 cm3 - 40 cm3 = 20 cm3
iii)
Density
Density =
Density = = 2 g/cm3 or 2 gcm-3
iv)
Instruments for measuring mass of an irregular object
1. Beam balance
2. Top pan balance
3. Electronic balance
iv)
Precautions to be taken in performing the experiment
1. The object should be lowered gently into the water in the cylinder
2. Volume of the liquid should be read from the base of the meniscus or at the eye level
3. The measuring cylinder should be placed on a flat surface
c)
i)
(α) chemical processes
II and III
(β) physical processes
I and IV
ii)
(α) Why chemical processes
1. The initial/original substance cannot be gotten back easily/irreversible
2. New substance formed
3. Change in mass
4. Accompanied by appreciable heat change
(β) Why physical processes
1. The initial/original substance can be gotten back easily/reversible
2. No new substance formed
3. No change in mass
4. Not accompanied by appreciable heat change
iii)
Examples of physical change
1. Expansion of metal on heating
2. dissolving sugar or salt in Water
3. Boiling of water
4. Melting of ice
5. Breaking/crushing of any Object
d)
i)
| Year\Plot | 1 | 2 | 3 |
| 1 | maize | soyabean | yam |
| 2 | yam | maize | soyabean |
| 3 | soyabean | yam | maize |
ii)
Principles to consider when planning for rotational programme
1. Deep rooted crops should be followed by shallow rooted crops
2. Crops of the same family/class should not follow each other
3. Crops that use the same soil nutrients should not follow each other
4. Leguminous crops should be included in the cycle
5. A fallow period may be included in the crop rotation programme
6. Crops which attract the same diseases and pests should not follow each other
iii)
Reasons for selecting the crop named V (Soyabean)
1. Soyabean is a legume and therefore builds up soil fertility
2. Yam is a deep rooted crop and should be followed by soyabean which is a shallow rooted crop
3. Yam is a heavy feeder and must have taken good part of the nutrients
4. Yam and soyabean belong different classes of crops and therefore not likely to attract the same pests and diseases
5. Improves soil structure
iv)
Advantages of crop rotation
1. Increases soil fertility
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
3.
(a)
State two examples of a
(i)
carnivore;
(ii)
herbivore.
(b)
What is the difference between egestion and excretion?
(c)
Explain briefly why
(i)
gold is used to make necklaces and earrings.
(ii)
steel is used instead of iron to make car bodies
(d)
(i)
What is surface tension?
(ii)
Explain why the surface of water in a container is not flat but curved.
(a)
(i)
Examples of carnivores
1. Tiger
2. Lion
3. Cat
4. Wolf
5. Leopard
6. Hyena
7. Polar Bear
8. Cheetah
9. Giant Panda
10. Felidae
11. Sharks
12. Venus Fly Traps
13. Dog
14. Crocodile
(ii)
Examples of herbivores
1. Elephant
2. Sheep
3. Goat
4. Deer
5. Antelope
6. Cow
7. Grasscutter
8. Pandas
9. Gorillas
10. Elk
11. Zebras
12. Grasshopper
13. Buffalo
14. Rabbit
(b)
Difference between egestion and excretion
Egestion is the removal of undigested food substances from the body while excretion is the removal of metabolic wastes/substances.
(c)
(i)
Why gold is used to make necklaces and earrings
Gold is non-reactive/does not react with atmospheric oxygen/gases and hence maintains its shiny surface/lustre/colour for a long time.
(ii)
Why steel is used instead of iron to make car bodies
Steel is stronger than iron and does not rust/corrode easily.
(d)
(i)
Surface tension is the propertey of a liquid that makes the surface behave as if it were a stretched elastic skin/membrane.
(ii)
Why the surface of water in a container is not flat but curved
The adhesive force between water molecules and the container is greater than the cohesive forces holding the water molecules together.
4.
(a)
Define the term osmosis
(b)
State two examples of everyday observations which can be explained in terms of capillary action.
(c)
(i)
Name the three processes by which heat can be transferred.
(ii)
Name three appliances which use thermostat.
(d)
(i)
What is a saturated solution?
(ii)
State whether each of the following is a solution, suspension or a colloid:
Clay in water
Sugar in water
Ammonia in water
Powdered chalk in water
Potassium permanganate in water
Soap in water
(a)
Osmosis is the movement of water molecules from a region of lower concentration to a region of higher concentration through a semi-permeable membrane
OR
Osmosis is the movement of water molecules from a dilute solution to a concentrated solution through a semi-permeable membrane.
(b)
Examples of everyday observations which can be explained in terms of 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
(c)
(i)
Processes by which heat can be transferred
1. Conduction
2. Convection
3. Radiation
(ii)
Electrical appliances which use thermostat
1. Electric pressing iron
2. Refrigerator
3. Electric cooker
4. Air conditioner
5. Electric water heater
6. Electric oven
7. Medical and scientific incubator
(d)
(i)
A saturated solution is a solution that will not dissolve any more solute added to it at a given temperature.
(ii)
| Solution | Suspension | Colloid |
|
Sugar in water
|
Clay in water
|
Soap in water |
5.
(a)
(i)
What is neutralization reaction?
(ii)
Write a balanced chemical equation for the reaction between each of the following pairs of substances:
(α)
Sodium metal and dilute hydrochloric acid
(β)
Sodium hydroxide and dilute hydrochloric acid
(b)
Explain weaning as used in animal production.
(c)
(i)
What is a Milky Way?
(ii)
State one use of artificial satellites.
(d)
(i)
What is a habitat?
(ii)
Give two examples of a habitat.
(a)
(i)
Neutralization reaction is a chemical reaction between an acid and a base to form salt and water only.
(ii)
(α)
Reaction between sodium metal and dilute hydrochloric acid
2Na(s) + 2HCl(aq) → 2NaCl(s) + H2(g)
(β)
Reaction between sodium hydroxide and dilute hydrochloric acid
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
(b)
Weaning is the changing of the offspring's diet from breast milk to other kinds of food.
(c)
(i)
Milky Way is the galaxy in which the solar system is located.
OR
Milky Way is the group of planets and stars which the earth belongs to.
(ii)
Uses of artificial satellites
1. For space exploration
2. For communication/broadcasting/telephone call
3. For weather forecasting/collecting information on the weather
4. For scientific research/experimental research/internet
5. For military purposes/spying/espionage
6. To study the universe
7. For map making
8. For navigation/satellite for navigation
(d)
(i)
Habitat is a natural living place of an organism.
OR
Habitat is a place where an organism spends parts/all of its life.
(ii)
Examples of a habitat
1. Aquatic e.g Ponds, streams, lakes, rivers, marine (sea)
2. Terrestrial e.g Forest, Savannah, thicket
3. Arboreal e.g Tree branches, leaves
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.