KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Digestion of fats and oils in humans starts in the
A.
colon.
B.
gullet.
C.
mouth.
D.
duodenum.
Answer: D
2.
Which of the following practices encourages soil erosion?
A.
Planting trees on bare soil
B.
Clearing trees and slopes
C.
Planting grasses along slopes
D.
Ploughing across slopes
E.
Preventing bush fires
Answer: B
3.
Which of the folloeing substances are carried by the blood?
I. Nutrients
II. Urine
III. Oxygen
IV. Carbon dioxide
A.
II and III only
B.
I, II and IV only
C.
I and III only
D.
I, III and IV only
Answer: D
4.
The gas produced when glucose is oxidized during aerobic respiration is
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Carbon dioxide
Answer: D
5.
Which of the following living organisms is not a reptile?
A.
Lizard
B.
Tortoise
C.
Frog
D.
Snake
E.
Crocodile
Answer: C
6.
The instrument used to measure current in an electric circuit is the
A.
ammeter.
B.
photometer.
C.
thermometer.
D.
voltmeter.
Answer: A
7.
A fruit in which the pappus has been modified into a parachute structure is dispersed by
A.
explosion
B.
mammals
C.
water
D.
wind
Answer: D
The slightest gust of wind catches the elaborate crown of plumose hairs, raising and propelling the seed into the air like a parachute. The pappus is persistent ant and hence found attached to even small, single seeded fruits. It acts like a parachute that allows the wind carry them to great distances.
8.
Chlorine gas is passed through water during filtration to
A.
kill germs.
B.
cause suspended particles to settle.
C.
soften the water.
D.
give taste to the water.
Answer: A
9.
Which of the following metals is an alloy?
A.
Aluminium
B.
Brass
C.
Copper
D.
Iron
E.
Zinc
Answer: B
10.
Soil depletion is not caused by
A.
erosion.
B.
afforestation.
C.
leaching.
D.
illegal mining.
Answer: B
Afforestation is the process of introducing trees and tree seedlings to an area that has previously not been forested. Afforestation can be done through tree planting and seeding, naturally or artificially.
11.
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
12.
Steam changes to liquid by a process called
A.
evaporation.
B.
condensation.
C.
melting.
D.
boiling.
Answer: B
13.
An example of a derived quantity is
A.
length
B.
mass
C.
temperature
D.
volume
Answer: D
14.
A lunar eclipse may occur when the
A.
moon is between the earth and the sun.
B.
sun is between the earth and the moon.
C.
earth is between the sun and the moon.
D.
moon is positioned far away from the earth.
Answer: C
Eclipse
The earth, along with the other planets, revolves around the sun in its orbit. In turn, the moon revolves around the earth in the moon’s orbit. There comes a time when the three heavenly bodies get aligned in the same straight line. This is when an eclipse occurs. It is defined as an astronomical phenomenon that occurs when one spatial object comes within the shadow of another spatial object. This obstructs the observer from seeing one of them in space. On earth, we witness two types of eclipses: solar and lunar.
Solar Eclipse
Also known as the eclipse of the sun, it occurs when the moon comes in between the sun and the earth. As a result, the moon blocks the light of the sun from reaching the earth's surface and casts a shadow on it. This occurs in a new moon phase.
Lunar Eclipse
Also known as the eclipse of the moon, it occurs when the earth comes in between the sun and the moon. As a result, the earth blocks the light of the sun from reaching the moon’s surface and casts its shadow on the moon. It occurs on a full moon day.
15.
Which of the following practices is not a principle of crop rotation?
A.
Legumes should be added to the rotation programme.
B.
Deep rooted crops should be followed by shallow rooted crops.
C.
Crops that are closely related should follow each other.
D.
Fallow period should be allowed during the time of rotation.
Answer: C
16.
The proper way of maintaining soil structure and fertility is termed as soil
A.
conservation
B.
depletion
C.
profile
D.
erosion
Answer: A
17.
The process of removing unproductive poultry birds from a flock is referred to as
A.
candling
B.
culling
C.
dehorning
D.
drenching
Answer: B
18.
An example of a mixture is
A.
sodium sulphate.
B.
hydrogen chloride.
C.
ammonia.
D.
salt solution
Answer: D
Only salt solution is a mixture (mixture of salt and water). The rest are all compounds.
19.
Which of the following is a liquid?
A.
Iron
B.
Mercury
C.
Brass
D.
Gold
E.
Aluminium
Answer: B
20.
The anemometer is an instrument used in determining
A.
amount of rainfall.
B.
speed of wind.
C.
relative humidity.
D.
intensity of light.
Answer: B
21.
Which of the following processes can occur at all temperatures?
A.
Boiling
B.
Evaporation
C.
Melting
D.
Sublimation
Answer: B
22.
Ice is able to float on water because the ice is
A.
colder than water.
B.
denser than water.
C.
has a greater mass for the same volume of water.
D.
has a greater volume for the same mass of water.
Answer: D
23.
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
24.
One of the characteristics of wind pollinated flowers is that they
A.
are large and conspicuous.
B.
are usually scented.
C.
have nectar.
D.
have feathery stigma.
Answer: D
25.
Which of the following processes could be used to preserve fish for a long time?
A.
Boiling only
B.
Salting only
C.
Sun drying only
D.
Boiling and sun drying
E.
Salting and sun drying
Answer: E
26.
The solid component found on the filter paper and the liquid component that flows into a container during filtration are respectively called
A.
filtrate and residue.
B.
condensate and residue.
C.
residue and filtrate.
D.
residue and condensate
Answer: C
The solid that remains on the filter paper is called the residue, and the liquid that passes through the filter paper is called the filtrate
27.
The most sensitive region of the eye to light rays is the
A.
retina
B.
pupil
C.
cornea
D.
iris
E.
lens
Answer: A
28.
A body has a density of 30gcm-3 and a volume of 6cm3. Determine the mass of the body.
A.
180.0g
B.
24.0g
C.
5.0g
D.
0.2g
Answer: A
29.
There are thick forests in some parts of the world because the climate there is
A.
Warm and dry
B.
Cool and dry
C.
Hot and dry
D.
Cool and wet
E.
Hot and wet
Answer: E
30.
In electrical circuits, the component that protects appliances against high currents is the
A.
capacitor.
B.
fuse.
C.
resistor.
D.
switch.
Answer: B
31.
Which of these is not a characteristic of all living things?
A.
Transpiration
B.
Growth
C.
Reproduction
D.
Feeding
E.
Respiration
Answer: A
32.
A clear solution of sugar was cooled from 100oC to 25oC. Some solid sugar was seen to have formed out of the solution after the cooling. This shows that sugar
A.
does not dissolve in cold water.
B.
does not dissolve in hot water.
C.
dissolves more in hot water than in cold water.
D.
dissolves more in cold water than in hot water.
Answer: C
33.
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.
34.
Which of the following examples of fertilizers improves soil texture?
A.
Compost
B.
N.P.K.
C.
Sulphate of ammonia
D.
Urea
Answer: A
35.
Animals depend on plants for food because
A.
animals do not need to drink water.
B.
only plants can make their food from simple substances.
C.
only plant food can satisfy animals.
D.
plants are available everywhere.
Answer: B
36.
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
37.
Leguminous crops may often be cultivated to add
A.
carbon to the soil.
B.
nitrogen to the soil.
C.
protein to the soil.
D.
potassium to the soil.
Answer: B
38.
An atom of an element is represented as 1225 X. What is the respective number of neutrons and protons in the atom?
A.
12 and 13
B.
12 and 25
C.
13 and 12
D.
25 and 12
Answer: C
The superscript represents the mass number which is made up of neutrons and protons
The value of the superscript is 25.
Number of protons + Number of neutrons = 25
The subscript represents the atomic number which is the number of electrons in a neutral atom. In a neutral atom, the number of electrons is equal to the number of protons.
Atomic number = 12
Atomic number = Number of electrons
Number of electrons = Number of protons
Number of electrons = 12
Number of protons = 12
Protons + Neutrons = 25
12 + Neutrons = 25
Neutrons = 25 - 12
Neutrons = 13
13 neutrons and 12 protons
39.
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 crops to grow.
D.
know the pesticides to use.
Answer: C
40.
The type of energy stored in food is referred to as
A.
chemical energy.
B.
electrical energy.
C.
heat energy.
D.
kinetic energy.
E.
light energy.
Answer: A
THEORY QUESTIONS
1.
(a)
(i)
Explain the term electromagnetism.
(ii)
Given a nail, insulated wire, key (or switch) and a battery, show by means of a circuit diagram how the nail can be magnetized.
(b)
List three symptoms of malaria.
(c)
State three ways of keeping the environment clean.
(d)
Write down the names of the new substances formed when the following compounds react:
(i)
Ammonia and dilute hydrochloric acid;
(ii)
Sodium hydroxide and dilute hydrochloric acid;
(iii)
Calcium carbonate and dilute hydrochloric acid.
(a)
(i)
Electromagnetism is the production of a magnet by the use of electric current.
(ii)
(b)
Symptoms of malaria
1. High body temperature
2. Sweating
3. Headache
4. Nausea and vomiting
5. Loss of appetite
(c)
Ways of keeping the environment clean
1. Weed surroundings regularly
2. Rubbish should be burnt regularly
3. Gutters should be kept clean
4. Proper disposal of refuse/sewage
(d)
New substances formed when the following compounds react:
(i)
Reaction: NH3 + HCl → NH4Cl
New substances formed: Ammonium chloride (NH4Cl)
(ii)
Reaction: NaOH + HCl → NaCl + H2O
New substances formed: Sodium chloride (NaCl) and water (H2O)
(iii)
Reaction: CaCO3 + 2HCl → CaCl2 + CO2 + H2O
New substances formed: Calcium chloride (CaCl2), carbon dioxide/Carbon (IV) oxide (CO2) and water (H2O)
2.
(a)
In each of the activities listed below state whether the changes that occur are physical or chemical. Explain your answers.
(i)
An egg is boiled for five minutes
(ii)
A piece of bread is chewed in the mouth for two minutes
(iii)
A piece of meat is chewed in the mouth for two minutes
(iv)
A piece of wood is burnt to ashes
(b)
Define each of the following
(i)
A machine
(ii)
Mechanical advantage of a machine
(iii)
Velocity ratio of a machine
(c)
A system of levers is used to overcome a resistance of 3,000 N when an effort of 150 N is applied to it. Calculate the mechanical advantage of the system.
(d)
(i)
List three general causes of diseases
(ii)
State four ways by which diseases can be prevented.
(a)
| # | Activity | Type of change | Reason |
| i) | An egg is boiled for five minutes | Physical change | No new substance is formed. However, the change is irreversible |
| ii) | A piece of bread is chewed in the mouth for two minutes | Chemical change |
New substance (maltose) is formed and the change is irreversible
Note: digestion of bread (carbohydrate) starts in the mouth |
| iii) | A piece of meat is chewed in the mouth for two minutes | Physical change |
No new substance is formed
Note: digestion of meat (protein) does not start in the mouth but rather the stomach |
| iv) | A piece of wood is burnt to ashes | Chemical change | New substance is formed and the change is irreversible |
(b)
(i)
A machine is a device that makes work easier or faster
OR
A machine machine is a device which enables a small force (effort) to overcome a large force (load).
(ii)
Mechanical advantage of a machine is the ratio of the load to the effort needed to raise the load
OR
Mechanical advantage (M.A) =
(iii)
Velocity ratio of a machine is the ratio of the distance moved by the effort to the distance moved by the load
OR
Velocity ratio (V.R) =
(c)
Mechanical advantage (M.A) =
Load = 3000 N
Effort = 150 N
Mechanical advantage (M.A) = = 20
Note: mechanical advantage and velocity ratio have no units.
(d)
(i)
General causes of diseases
1. Consequences of malnutrition
2. Vitamin or mineral salts deficiency
3. Air or water pollution
4. Chemical/food poisoning
5. Defects resulting from injuries
6. Poor sanitation
7. Poor personal hygiene
8. Not covering food properly
9. Pouring faeces or going to nature's call around
10. Throwing empty tins/cans about
11. Drinking bad/untreated water
(ii)
Ways by which diseases can be prevented
1. Washing hands before eating
2. Washing hands with soap after visiting toilet
3. Observing personal hygiene
4. Proper disposal of refuse/sewage
5. Keeping the environment clean
6. Drinking safe/treated water
7. Vaccination/immunization against diseases
8. Exercising the body
3.
a)
i)
What is soil erosion?
ii)
Give two types of soil erosion.
b)
Write the name and chemical formula of the compounds formed when the following elements combine:
i)
zinc and oxygen
ii)
calcium and chlorine
c)
i)
Distinguish between heat and temperature.
ii)
Draw and label the mercury-in-glass thermometer.
iii)
What mode of heat transfer is involved in the use of a thermometer?
a)
i)
Soil erosion is the removal/washing away of soil particles/topsoil by running water or rain or wind.
ii)
Types of soil erosion
1. Gully
2. Rill
3. Sheet
4. Splash
b)
i)
zinc and oxygen → Zinc oxide (ZnO)
ii)
calcium and chlorine → Calcium chloride (CaCl2)
c)
i)
Differences between heat and temperature
| Heat | Temperature |
| Is the energy which causes rise in temperature of bodies | Is the degree of hotness or coldness of a body |
| Measured in joules | Measured in kelvin (K) or degree celcius (oC) |
ii)
iii)
Conduction
4.
(a)
(i)
List the various planets of the solar system in the order they occur starting with the planet nearest the sun
(ii)
State one difference between the eclipse of the sun and the eclipse of the moon.
(b)
(i)
Define the term force
(ii)
State three types of force
(iii)
A box is pulled by a force of 20 N through a distance of 8 m along a smooth floor.
Calculate the work done by the force.
(c)
Draw simple electrical circuits showing the following arrangements:
(i)
A switch and a light bulb in series with two dry cells in series
(ii)
A switch and a light bulb in series with two dry cells in parallel
(d)
Name two diseases that can be controlled by immunization
(a)
(i)
List of planets of the solar system in the order they occur starting with the planet nearest the sun
1. Mercury
2. Venus
3. Earth
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune
9. Pluto
Note: you can use the below mnemonics to remember the nine planets.
My (Mercury) Very (Venus) Eyes (Earth) May (Mars) Just (Jupiter) See (Saturn) Under (Uranus) Nine (Neptune) Planets (Pluto)
(ii)
Difference between the eclipse of the sun and the eclipse of the moon
Eclipse of the sun occurs when the moon in its orbit comes between the sun and the earth such that all three are in a straight line while during the eclipse of the moon, the earth is between the sun and the moon such that all three are in a straight line.
(b)
(i)
A force is that which changes a body's state of rest or uniform motion in a straight line
OR
A force is a pull or a push on an object.
(ii)
Types of force
1. Gravitational force/Force of gravity
2. Magnetic force
3. Electrostatic force
4. Centripetal force
5. Centrifugal force
6. Tension
7. Thrust
8. Weight
9. Cohesive force
10. Adhesive force
11. Surface Tension
12. Frictional force
(iii)
Work done = Force x Distance
Force = 20 N
Distance = 8 m
Work done = 20 N x 8 m
Work done = 160 J
(c)
(i)
(ii)
(d)
Diseases that can be controlled by immunization
1. Tuberculosis
2. Measles
3. Poliomyelitis
4. Whooping cough
5. Diphtheria
6. Tetanus
7. Yellow fever
8. Cholera
5.
(a)
(i)
State what happens when photosynthesis occurs in a leaf.
(ii)
What is pollination?
(b)
Explain briefly why the mass of lumpy charcoal remains unchanged when ground into powder but the mass of the same lump changes when heated to burn.
(c)
(i)
What is a physical quantity?
(ii)
State two physical quantities
(d)
State two importance each of:
(i)
light;
(ii)
temperature;
in crop production
(a)
(i)
What happens when photosynthesis occurs in a leaf
Plants take in carbon dioxide (CO2) and water (H2O) from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose. Light is also absorbed by chlorophyll
(ii)
pollination is the transfer of pollen from the anther of a flower to the stigma of the same flower or another flower of the same type
(b)
Grinding lumpy charcoal is a physical change and therefore the components remain unchanged but burning charcoal is a chemical change and some of the components are released into the atmosphere
(c)
(i)
A physical quantity is any physical property of a material or substance that can be quantified, that is, can be measured using numbers
(ii)
1. Mass
2. Force
3. Density
4. Length
5. Temperature
6. Volume
7. Electric current
8. Velocity
9. Time
(d)
(i)
Importance of light in crop production
1. Needed for photosynthesis
2. Affects developments of fruits/growth of vegetative parts of crops
3. Absence of light results in weak stem
(ii)
Importance of temperature in crop production
1. Required for germination
2. Delays ripening of fruits when temperature is low
3. High temperature can cause evaporation from the soil causing water deficit for crops
4. High temperature can scorch the leaves of crops
5. Needed for photosynthesis/growth and development of plants
6.
(a)
Consider the substances listed below: carbon dioxide, gold, bronze, iron, oxygen and ink. From the list, select the substance that:
(i)
supports burning;
(ii)
is used as jewellery;
(iii)
is used for making statues.
(b)
(i)
Name two diseases associated with the circulatory system of humans.
(ii)
State one way of preventing each of the diseases named in (i).
(c)
Give two examples of each of:
(i)
major plant nutrients;
(ii)
minor plant nutrients.
(d)
(i)
State two properties of a good thermometric liquid.
(ii)
Give two examples of a good thermometric liquid.
(a)
(i)
supports burning → Oxygen
(ii)
is used as jewellery → Gold
(iii)
is used for making statues → Bronze
(b)
| Name of disease | Prevention |
| High blood pressure (Hypertension) |
1. Regular exercise
|
| Low blood pressure (Hypotension) |
1. Regular exercise
|
| Piles/Haemorrhoids |
1. Eat a lot of fruits/vegetables
|
| Leukaemia/Blood cancer |
1. Avoid smoking
|
| Varicose vein |
1. Regular exercise
|
| Arteriosclerosis |
1. Regular physical exercise
|
(c)
(i)
Examples of major plant nutrients
1. Nitrogen (N)
2. Phosphorus (P)
3. Calcium (Ca)
4. Magnesium (Mg)
5. Sulphur (S)
6. Potassium (K)
(ii)
Examples of minor plant nutrients
1. Copper (Cu)
2. Iron (Fe)
3. Zinc (Zn)
4. Manganese (Mn)
5. Boron (B)
6. Chlorine (Cl)
7. Cobalt (Co)
8. Molybdenum (Mo)
(d)
(i)
Properties of a good thermometric liquid
1. It does not wet/cling to the glass tube
2. It has a large temperature range within which it remains a liquid
3. It expands and contracts regularly/uniformly
4. It does not vaporize/condense in the tube
5. It is visible/opaque
(ii)
Examples of a good thermometric liquid
1. Mercury
2. Ethanol/Alcohol