KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Which of the following electrical appliances can convert electrical energy to heat energy?
I. Electric iron
II. Kettle
III. Water heater
A.
I, II and III
B.
I and III only
C.
II and III only
D.
I and II only
Answer: A
2.
The male sperms fertilize the female eggs to form the
A.
embryo
B.
ovary
C.
ovum
D.
placenta
E.
uterus
Answer: A
3.
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
4.
Landrace is a breed of
A.
cattle.
B.
goats.
C.
pigs.
D.
sheep.
Answer: C
5.
The density of a substance is 2.5 gcm-3. Calculate the volume of the substance if its mass is 25.0 g.
A.
0.1 cm3
B.
10.0 cm3
C.
22.5 cm3
D.
27.5 cm3
E.
62.5 cm3
Answer: B
Density =
Density x Volume = Mass
Divide both sides by density to make volume the subject.
Volume =
Volume =
Volume = 10 cm3
6.
Which of the following is an excretory organ?
A.
Anus
B.
Eye
C.
Heart
D.
Skin
E.
Pancreas
Answer: D
7.
When oil and water are shaken together they form a mixture called
A.
a solution.
B.
an emulsion.
C.
a solute.
D.
a solvent.
E.
a suspension.
Answer: B
An emulsion is defined as a mixture of two liquids which do not combine.
8.
The attracting power of magnets is greatest at the
A.
centre.
B.
edges.
C.
poles.
D.
sides.
E.
surface.
Answer: C
9.
The diagram below is an illustration of a transistor.
The arrow shows the direction of:
A.
electron movement.
B.
hole movement.
C.
electron and hole movement.
D.
negative charge movement.
Answer: A
The arrow in the symbol indicates the direction of flow of conventional current (electron movement)
10.
Which of the following is the organic part of the soil?
A.
Mineral salts
B.
Water
C.
Rock particles
D.
Air
E.
Humus
Answer: E
11.
To stop the spread of a disease caused by a dirty environment, one must
A.
eat healthy diet.
B.
ensure regular exercise.
C.
avoid alcohol.
D.
practice personal hygiene.
Answer: D
12.
Atmospheric pressure is measured with
A.
an anemometer
B.
a thermometer
C.
a galvanometer
D.
a barometer
E.
a voltmeter
Answer: D
13.
Which of the following statements about the negative use of Science and Technology is correct? It
A.
promotes good health.
B.
promotes easy communication.
C.
enable humans to use less energy in working.
D.
creates things that are dangerous to the environment.
Answer: D
14.
The energy for lighting a torchlight bulb comes from the
A.
bulb
B.
cell
C.
filament
D.
glass
E.
switch
Answer: B
15.
Why is it bad to throw faeces into rivers? Because
A.
Other people collect drinking water from them
B.
It changes the colour of the river
C.
It causes hardness of the water
D.
The faeces cannot dissolve in the water
E.
The river banks will be dirty
Answer: A
16.
The female part of a flower is called the
A.
filament.
B.
petal.
C.
pollen grain.
D.
sepal.
E.
Style.
Answer: E
17.
Which of the following is a liquid?
A.
Iron
B.
Mercury
C.
Brass
D.
Gold
E.
Aluminium
Answer: B
18.
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
19.
Which of the following statement(s) about pressure in fluids is/are correct? Pressure
I. decreases with depth
II. increases with depth
III. does not depend on the area
A.
I only
B.
II only
C.
I and II only
D.
II and III only
Answer: B
The pressure in a liquid is different at different depths. Pressure increases as the depth increases. The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions. For example, the pressure acting on a dam at the bottom of a reservoir is greater than the pressure acting near the top. This is why dam walls are usually wedge-shaped. The greater pressure at the bottom would give a greater ‘force per unit area’ on the wall.
20.
Elements that could easily lose electrons to form cations are
A.
metals.
B.
non-metals.
C.
semi-metals.
D.
noble gases.
Answer: A
21.
The edible part of the mango fruit is called
A.
endocarp
B.
drupe
C.
fibre
D.
mesocarp
E.
epicarp
Answer: D
22.
Water contains two elements, hydrogen and oxygen, in the ratio of
A.
1:2
B.
1:3
C.
2:1
D.
3:1
Answer: C
H2O = Water
23.
Which of the following pairs of energy sources is environmentally friendly?
A.
Coal and thermal energy
B.
Wind and biogas
C.
Wind and coal
D.
Biogas and thermal energy
Answer: B
Renewable energy sources are environmentally friendly.
24.
The shoot system of a flowering plant develops from the
A.
radicle.
B.
plumule.
C.
cotyledon.
D.
endosperm.
Answer: B
A shoot or seedling originates from the plumule of the seed’s embryo.
25.
A patient who coughs and spits out blood may be suffering from
A.
asthma
B.
pneumonia
C.
measles
D.
tuberculosis
E.
influenza
Answer: D
26.
Which of the following elements is a liquid at room temperature.
A.
Carbon.
B.
Mercury.
C.
Silver.
D.
Sulphur.
Answer: B
27.
The planet in our solar system which has the largest orbit is
A.
Jupiter.
B.
Mars.
C.
Pluto.
D.
Venus.
Answer: C
28.
Transplanting of seedlings is usually done in the evening because
A.
darkness promotes rapid growth
B.
pest attack is minimal.
C.
transpiration is minimal.
D.
seedlings require less nutrients.
Answer: C
29.
The instrument used to measure atmospheric pressure is called
A.
a thermometer.
B.
a force meter.
C.
a barometer.
D.
an anemometer.
Answer: C
30.
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
31.
The farming system that makes effective use of available soil nutrients in a growing season is
A.
crop rotation.
B.
land rotation.
C.
mixed cropping.
D.
mixed farming.
Answer: A
32.
Which of the following substances is used to purify water for town supply?
A.
Alcohol
B.
Carbon dioxide
C.
Chlorine
D.
Nitrogen
E.
Sulphur
Answer: C
33.
The digestion of carbohydrates starts in the
A.
mouth
B.
throat
C.
stomach
D.
duodenum
E.
ileum
Answer: A
34.
Which of the following chemical compounds is used in removing hardness in water?
A.
NaCl
B.
NaOH
C.
Na2CO3
D.
NaHCO3
Answer: C
35.
When living organisms die, the mineral salts in their bodies become available to the soil through the process of
A.
evaporation
B.
sedimentation
C.
defecation
D.
decay
E.
osmosis
Answer: D
36.
A man applied a force of 50 N to push a wheelbarrow through a distance of 6 m. Calculate the work done.
A.
300 J
B.
56 J
C.
44 J
D.
30 J
Answer: A
Work done = Force x Distance
Force = 50 N
Distance = 6 m
Work done = 50 x 6 = 300 J
37.
When gases are heated they
A.
melt.
B.
sublime.
C.
decrease in volume.
D.
decrease in intermolecular forces
Answer: D
When a particle is heated
The intermolecular forces are the attractions between the molecules when temperature increases it develops more distance between molecules and because of this attraction decreases, resulting intermolecular force decreases.
Intermolecular forces decreases on heating as the particles gain energy and start vibrating.
The intermolecular space between particles increases and they overcome the intermolecular forces.
Hence, the intermolecular forces decrease on heating because kinetic energy increases and space between particles increases.
38.
A patient with symptoms of diarrhoea and vomiting may be suffering from
A.
cholera.
B.
dysentery.
C.
influenza.
D.
tuberculosis.
Answer: A
39.
The fixed point of a lever at which turning takes place is the
A.
pivot
B.
effort
C.
load
D.
handle
E.
machine
Answer: A
40.
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
THEORY QUESTIONS
1.
a)
i)
State two differences between an ecosystem and a habitat.
ii)
What is meant by the term blood?
b)
Explain why it is difficult to separate iron and sulphur mixture after strong heating.
c)
Draw and label a diagram of a ray of light which makes an angle of 350 with the surface of a plane mirror.
d)
State two
i)
advantages of a land rotation.
ii)
disadvantages of land rotation.
a)
i)
| Ecosystem | Habitat |
| Larger | Smaller |
| Larger number of species | Smaller number of species |
| Involves different species | Involves a specific species |
ii)
Blood is a body fluid that transports oxygen and nutrients to the cells and carries away carbon dioxide and other waste products.
b)
Reasons why iron and suphur cannot be separated when heated
After heating, a chemical change occurs and the two substances are chemically combined (compound formed) and no longer a mixture
c)
Angle of incidence = Angle of reflection
Angle of incidence + 35o = 90o
Angle of incidence = 90o - 35o
Angle of incidence = 55o
Since angle of incidence = Angle of reflection
Angle of reflection = 55o
d)
i)
Advantages of land rotation
1. It helps check the spread of diseases
2. Land regains lost nutrients after the fallow period
3. Checks spread of pests
ii)
Disadvantages of land rotation
1. Does not encourage large scale farming
2. Virgin forest is destroyed
3. Needs a lot of time and work/ not easy to practice
4. Land is not fully utilized
5. Not suitable for areas where land is scarce
6. Encourages soil erosion
2.
(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
3.
(a)
(i)
What is refraction of light?
(ii)
Sketch a diagram to show the path of a light ray when it travels from air to glass.
(b)
Explain why it is difficult to separate iron and sulphur mixture after strong heating.
(c)
(i)
Give two examples of digestive enzymes produced in humans.
(ii)
For each of the enzymes given in (i), name the part of the human body where the enzyme is produced.
(d)
List four methods of applying fertilizers to crops.
(a)
(i)
Refraction of light is the bending/change in direction/change in velocity of light as it travels from one medium to another.
(ii)
(b)
Why it is difficult to separate iron and sulphur mixture after strong heating
It leads to a chemical change resulting in the formation of a compound (iron sulphide)/a compound is formed.
(c)
| Name of enzyme | Part of the human body where it is produced |
| Ptyalin | Salivary gland |
| Amylase | Pancreas/Small intestine |
| Pepsin | Stomach |
| Rennin | Stomach |
| Lipases | Pancreas/Small intestine |
| Trypsin | Small intestine |
(d)
Methods of applying fertilizers to crops
1. Ringing
2. Side placement/side dressing
3. Foliar/aerial application/spraying
4. Inter-raw placement
5. Band placement
6. Drilling
7. Broadcasting
8. Through irrigation water/fertigation
9. Top dressing
4.
a)
i)
What is a magnetic field?
ii)
Name two methods of making magnets.
b)
Explain briefly the term teenage pregnancy.
c)
Write the formula for each of the following compounds:
i)
calcium chloride;
ii)
copper (I) oxide;
iii)
nitrogen (IV) oxide;
iv)
ammonia.
d)
i)
List three physical properties of soil.
ii)
What is the texture of clayey soil?
a)
i)
Magnetic field is a region/area around a magnet/moving electric charge within which the force of magnetism acts/can be felt/experienced
ii)
Methods of making magnets
1. By induction
2. By stroking
3. By the use of electricity
4. By hammering/hitting
b)
Teenage Pregnancy
When a girl under the age of 20 conceives/takes seed or when a female/girl under the age of 20 gets pregnant
c)
i)
calcium chloride → CaCl2
ii)
copper (I) oxide → Cu2O
iii)
nitrogen (IV) oxide → NO2
iv)
ammonia → NH3
d)
i)
Physical properties of soil
1. Texture
2. Structure
3. Temperature
4. Colour
5. Permeability
6. Water
7. Capillarity
8. Organism
9. Drainage
10. Air
11. Strength/consistence
12. Porosity
ii)
Texture of clayey soil
It is smooth/slippery/sticky when wet
5.
(a)
Explain why a tomato plant is likely to wilt if too much fertilizer is applied to it.
(b)
(i)
Give two differences between electrical insulators and electrical conductors.
(ii)
State two effects of illegal electrical connections in the home.
(c)
Explain each of the following terms as used to describe change of state of matter:
(i)
condensation;
(ii)
freezing.
(d)
(i)
State two diseases of the circulatory system in humans.
(ii)
Mention two ways in which each of the diseases you have stated in (d)(i) can be prevented.
(a)
Why a tomato plant is likely to wilt if too much fertilizer is applied to it
Once two solutions of different concentrations come into contact, water molecules will flow from low to higher concentrated solution. Hence application of fertilizer makes the soil solution of higher concentration so water flow out of the plant by osmosis. The tomato plant plasmolyses/loses water and wilt.
Note
Plasmolysis describes a process involving a plant cell losing water content and therefore contracting and shrinking its cytoplasm and plasma membrane away from the inside of its cell wall. This occurs if the solution surrounding a plant cell is hypertonic or has a high concentration of solutes like salt.
(b)
(i)
Differences between electrical insulators and electrical conductors
| Electrical insulators | Electrical conductors |
| Does not conduct electricity | Conducts electricity |
| Has narrow conduction energy band | Has wide conduction energy band |
| There exists a wide forbidden energy gap between valence and conduction band | Has no forbidden energy gap |
| Electrons firmly bound to nucleus | Electrons loosely bound to nucleus |
| There are no free electrons | Has more free electrons |
(ii)
Effects of illegal electrical connections in the home
1. Overload of power supply
2. Drop in voltage of electricity
3. Leads to frequent power cuts
4. Leads to electrocution/electric shock
5. May cause fire outbreak
6. May damage electrical appliances
7. Leads to loss of revenue to government
(c)
(i)
Condensation is the change from the gas state to the liquid state.
(ii)
Freezing is the change from the liquid state to the solid state.
(d)
| Disease of the circulatory system | 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
|
6.
(a)
Explain each of the following observations in nature:
(i)
In the depths of the ocean where it is always dark, there are no green plants.
(ii)
On an island where there are no insects and birds, the pawpaw plant produces only flowers but no fruits
(b)
Describe how soil is formed.
(c)
(i)
State the laws of reflection
(ii)
Draw a labelled diagram to show the reflection of light on a plane mirror
(a)
(i)
In the depths of the ocean where it is always dark, there are no green plants
Light does not get to those depths and therefore photosynthesis cannot occur there.
(ii)
On an island where there are no insects and birds, the pawpaw plant produces only flowers but no fruits
Insects and birds transfer pollen grains for pollination of pawpaw flowers and in their absence fertilization does not occur and there is no fruit formation.
OR
Insects and birds are agents of pollination/transfer pollen grains. In their absence no fertilization and no fruit formation occur.
(b)
How soil is formed
Soil is formed when rocks weather/breakdown to form soil particles. Dead remains of organisms are acted upon by micro-organisms and all mix together.
(c)
(i)
Laws of reflection
1. The incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane
2. The angle of incidence is equal to the angle of reflection
(ii)
A labelled diagram to show the reflection of light on a plane mirror
