KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Which of the following diseases results from malnutrition?
A.
Scurvy
B.
Measles
C.
Malaria
D.
Gonorrhoea
Answer: A
Malnutrition
Malnutrition is a condition that occurs when one is not obtaining enough nutrients.
A condition which occurs when there is a deficiency of certain vital nutrients in a person's diet
Some deficiency diseases and their causes
| Disease | Cause |
| Rickets | Lack of vitamin D or calcium |
| Kwashiorkor | Lack of proteins |
| Goitre | Lack of iodine |
| Night blindness | Lack of vitamin A |
| Scurvy | Lack of vitamin C (ascorbic acid) |
| Pellagra | Lack of vitamin B3 |
| Beriberi | Lack of vitamin B1 |
| Dermatitis | Lack of vitamin B2 |
| Marasmus | Lack of protein and carbohydrates |
| Anaemia | Lack of iron or folic acid |
| Prolonged bleeding | Lack of vitamin K |
2.
Which of the following bodies is a satellite of the earth?
A.
Mars
B.
Sun
C.
Venus
D.
Moon
E.
Mercury
Answer: D
3.
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
4.
Which of the following substances is a compound?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Water
Answer: D
5.
A car battery produces electrical energy from
A.
Chemical energy
B.
Sound energy
C.
Kinetic energy
D.
Heat energy
E.
Potential energy
Answer: A
6.
Which of the following statements about a force are true?
I. It causes moving objects to stop
II. It causes stationary objects to move
III. It can change the direction of motion
IV. It can change the shape of an object
A.
I and II only
B.
III and IV only
C.
I, II and III only
D.
I, II, III and IV
Answer: D
7.
The gas produced when dilute hydrochloric acid is added to calcium carbonate is
A.
ammonia.
B.
carbon dioxide.
C.
chlorine.
D.
hydrogen.
E.
oxygen.
Answer: B
Chemical Equation
CaCO3(s) + 2HCl(aq) → CaCl2 (s) + H2O(aq) + CO2(g)
CO2(g) = Carbon dioxide
8.
Energy is measured in
A.
Kelvin
B.
Joules
C.
Watts
D.
Metres
E.
Amperes
Answer: B
9.
Sodium hydroxide is an example of a base because it
A.
has sour taste.
B.
has a pH less than 7.
C.
turns wet blue litmus paper red.
D.
turns wet red litmus paper blue.
Answer: D
10.
The part of the soil that is most important for the growth of plants is
A.
clay.
B.
humus.
C.
sand.
D.
silt.
Answer: B
Humus
Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up. This material is called leaf litter. When animals die, their remains add to the litter.
It is a kind of soil organic matter. It is rich in nutrients and retains moisture in the soil.
11.
Global warming is caused by the
A.
circulation of oxygen in the atmosphere.
B.
excessive release of carbon dioxide into the atmosphere.
C.
release of hydrogen into the atmosphere.
D.
circulation of nitrogen in the atmosphere.
Answer: B
12.
The farming system that makes the most effective use of land is
A.
crop rotation.
B.
land rotation.
C.
mixed cropping.
D.
mixed farming.
Answer: D
13.
Which of the following features in plants are used for defence?
A.
Buds
B.
Leaf spines
C.
Pitchers
D.
Roots
E.
Tendrils
Answer: B
14.
The amount of water vapour in the atmosphere is called
A.
fog.
B.
humidity.
C.
rain.
D.
temperature.
Answer: B
15.
About 55% of blood is made up of the plasma while the remaining 45% is made up of
A.
Cells
B.
Cochlea
C.
Iris
D.
Retina
E.
Trachea
Answer: A
16.
The ability of birds to fly depends on
A.
Their hollow hones only
B.
Their flight feathers only
C.
Their feathers covering their bodies
D.
Their hollow bones and flight feathers
E.
Their light bodies only
Answer: D
17.
The physical arrangement of soil particles into aggregate is termed
A.
soil porosity
B.
soil profile
C.
soil structure
D.
soil texture
Answer: B
18.
Which of the following apparatus is not required in the process of distillation in the laboratory?
A.
Condenser
B.
Evaporating dish
C.
Bunsen burner
D.
Round bottom flask
Answer: B
19.
The blackpod disease which attacks cocoa pods is caused by
A.
virus
B.
bacterium
C.
plasmodium
D.
fungus
E.
protozoa
Answer: D
20.
Grasshopper management is crucial because of all the following reasons except
A.
damage to crops.
B.
incomplete metamorphosis.
C.
ecosystem disruption.
D.
livestock harm.
Answer: C
21.
All the following substances are mixtures except
A.
ink
B.
blood
C.
air
D.
palm wine
E.
carbon dioxide
Answer: E
22.
The gas usually used in fire extinguishers is
A.
carbon dioxide.
B.
carbon monoxide.
C.
hydrogen.
D.
oxygen.
Answer: A
Why carbon dioxide is used as fire extinguisher
Carbon dioxide (CO2) is not a supporter of combustion (combustion is an exothermic process that involves the formation of heat and light ).
Fire is caused by the three elements i.e. fuel, oxygen, and heat. If one of the three elements is removed fire will stop.Carbon dioxide removes one element, i.e oxygen.
(CO2), being heavier than oxygen, covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled.
23.
The by-products of respiration are
A.
carbon dioxide and heat
B.
carbon dioxide and water
C.
oxygen and heat
D.
oxygen and water
Answer: B
24.
A simple way of maintaining the efficiency of a machine is by
A.
oiling its parts.
B.
fitting new parts on the machine.
C.
making sure it is always working.
D.
making sure it works at low speed.
Answer: A
Friction reduces the efficiency of the machine as part of the work input is used to overcome friction. Oiling the parts reduces the friction thereby increasing the efficiency of the machine.
25.
The figure below shows a simple electric circuit.
Use it to answer the question below.
The purpose of the component labelled IV is to
A.
supply energy to the circuit.
B.
measure the voltage of the battery.
C.
prevent too much current from flowing.
D.
close the circuit.
Answer: C
26.
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.
27.
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
28.
The food nutrient which ensures good health in farm animals is
A.
carbohydrates.
B.
minerals.
C.
proteins.
D.
vitamins.
Answer: D
29.
Which of the following is a plant parasite?
A.
Capsid
B.
Caterpillar
C.
Dodder
D.
Louse
E.
Nematode
Answer: C
30.
Which of the following substances can be used as an electrical insulator?
A.
Copper
B.
Graphite
C.
Plastic
D.
Zinc
Answer: C
Materials like glass and plastic are poor electrical conductors, and are called insulators. They are used to stop electricity from flowing where it is not needed or where it can be dangerous, such as through our bodies. Cables are wires covered in plastic so we can handle them safely.
31.
When mango is falling from a tree, its potential energy is changed to
A.
sound energy.
B.
heat energy.
C.
kinetic energy.
D.
chemical energy.
Answer: C
Kinetic energy is the energy which a body possesses by virtue of being in motion.
32.
The atom of an element has 4 protons and 5 neutrons in its nucleus. How many shells are occupied in the atom?
A.
1
B.
2
C.
3
D.
4
E.
5
Answer: B
The number of protons equals the number of electrons in a neutral atom.
Since there are 4 protons, the number of electrons is also 4
The first shell of an atom takes a maximum of 2 electrons and the subsequent shells take maximum of 8 electrons
For 4 electrons, the first shell will take 2 electrons and the second shell will take the remaining 2 electrons.
Hence the atom has 2 shells.
33.
Digestion of fats and oils in humans starts in the
A.
colon.
B.
gullet.
C.
mouth.
D.
duodenum.
Answer: D
34.
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
35.
The following effects are as a result of soil erosion except
A.
increase in bushfires.
B.
weakening support of plants.
C.
loss of important minerals to plants.
D.
weakening of support of buildings.
Answer: A
36.
Which of the following food items produces amino acids as end-product of digestion?
A.
Cabbage
B.
Fish
C.
Margarine
D.
Rice
Answer: B
37.
The disease in humans which is associated with insufficient intake of calcium is
A.
goiter.
B.
kwashiorkor.
C.
rickets.
D.
scurvy.
Answer: C
38.
Plants lose water through a process called
A.
photosynthesis
B.
fertilization
C.
transpiration
D.
respiration
E.
evaporation
Answer: C
39.
In which of the following situations is work not done? When a
A.
truck moves
B.
wheelbarrow is pushed
C.
fruit falls from a tree
D.
football is kicked
E.
book lies on a table
Answer: E
Work = Force x Distance
If there is no movement (distance = 0), work is also 0.
Thus when distance = 0,
Work done = Force x 0 = 0 J
40.
Which of the following environmental factors increases sweating in humans?
A.
Low temperature
B.
Low pressure
C.
High pressure
D.
High temperature
E.
High humidity
Answer: D
THEORY QUESTIONS
1.
(a)
(i)
Define density of a substance
(ii)
Explain how the density of a stone could be determined
(b)
A box with a volume of 1000 m3 is filled with sand to the brim. If the density of sand is 2 kgm-3, calculate the mass of sand in the box.
(c)
Copy and complete the table below:
| Parasite | Disease | Prevention |
| Vibrio cholerae | Cholera | Eating hot food |
| Plasmodium | (i) | (ii) |
| Louse | (iii) | Personal Hygiene |
| (iv) | Ringworm | (v) |
(d)
Name the method which could be used to separate each of the following mixtures into their components:
(i)
Alcohol and water
(ii)
Salt and water
(iii)
Powdered charcoal and iron filings
(iv)
Powdered chalk and water
(a)
(i)
Density is the mass per unit volume of a substance
OR
Density =
(ii)
Determination of the density of stone
1. Measure/weigh the mass of stone by means of a beam/chemical balance as M g
2. Fill a large measuring cylinder with water to a suitable level and record the volume as V1 cm3
3. Tie the stone with thread and gently lower it into the water in the measuring cylinder and record the new volume as V2 cm3
The density of the stone is then calculated as follows:
Volume of stone = V2 cm3 - V1 cm3
Mass of stone = M g
Density =
Density of the stone =
(b)
Density =
Density x Volume = Mass
∴ Mass = Density x Volume
Density = 2 kgm-3
Volume = 1000 m3
Mass = 2 kgm-3 x 1000 m3
Mass = 2000 kg
(c)
Parasite |
Disease |
Prevention |
Vibrio cholerae |
Cholera |
Eating hot food |
Plasmodium |
(i) Malaria |
(ii) 1. Sleeping in mosquito nets
|
Louse |
(iii) Typhus |
Personal Hygiene |
|
(iv) Fungus |
Ringworm |
(v) 1. Avoid sharing comb and towel
|
(d)
Methods of separation:
(i)
Alcohol and water → Distillation/fractional distillation
(ii)
Salt and water → Distillation/Evaporation and condensation
(iii)
Powdered charcoal and iron filings → Use of magnet
(iv)
Powdered chalk and water → Filtration/decantation
2.
(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
3.
(a)
The diagrams below are illustrations of an experiment to demonstrate a biological principle.
Study the diagrams carefully and answer the questions that follow.
(i)
Name the parts labelled I and II.
(ii)
State two differences between the set-ups A and B.
(iii)
What is the role played by the part labelled I in the experiment?
(iv)
Name the biological principle being demonstrated in this experiment.
(v)
State one way in which plants benefits from the principle named in (iv).
(vi)
State one way in which animals benefit from the principle named in (iv).
(b)
In an experiment to investigate the reactivity of zinc, a piece of the metal was dropped into a test tube containing dilute hydrochloric acid. The experiment set-up is illustrated below.
Study the set-up carefully and answer the questions that follow.
(i)
Write a balanced chemical equation for the reaction that occurred in the experiment.
(ii)
Name the gas evolved.
(iii)
List two metals which can react in a similar way as the zinc.
(iv)
List two metals which cannot react in a similar way as the zinc.
(v)
Name two glass apparatus which could have been used instead of the test tube.
(c)
The diagram below is an illustration of a thermos flask.
Study the diagram carefully and answer the questions that follow.
(i)
Name the parts labelled I, II, III, IV and V.
(ii)
How does the device minimize heat loss or gain through
(α)
conduction?
(β)
convection?
(γ)
radiation?
(iii)
State one use of the thermos flask.
(d)
The diagrams below illustrate an experimental set-up on a physical property of soil using three soil types X, Y and Z.
Study the set-up carefully and answer the questions that follow:
(i)
Name the parts of the set-up labelled I, II, III and IV.
(ii)
Which of the three soil types has the
(α)
highest water holding capacity?
(β)
least water holding capacity?
(iii)
Name each of the three soil types X, Y and Z.
(iv)
Suggest a suitable title for the experiment.
(a)
(i)
I → Fresh yam cup/peeled yam/yam
II → Beaker
(ii)
Differences between the set-ups A and B
1. The volume/level of solution B is greater/higher than the volume/level of solution in A.
2. The volume/level of water in B is greater/higher than the volume/level of water in A.
(iii)
Role played by the part labelled I (fresh yam cup) in the experiment
It acts as a semi-permeable membrane /it allows water molecules to pass through
(iv)
The biological principle demonstrated in the experiment is Osmosis.
(v)
Ways in which plants benefits from osmosis
1. Water absorption by root hairs
2. Movement of water from cell to cell within the plant
(vi)
Ways in which animals benefit from Osmosis
1. Selective absorption of water in the kidney
2. Re-absorption of water in the large intestine
(b)
(i)
Zn + 2HCl → ZnCl2 + H2
(ii)
Hydrogen gas
(iii)
Metals which can react in a similar way as zinc
1. Potassium
2. Calcium
3. Sodium
4. Magnesium
5. Iron
6. Tin
7. Aluminium
8. Lithium
(iv)
Metals which cannot react in a similar way as the zinc
1. Copper
2. Gold
3. Silver
4. Mercury
5. Platinum
6. Lead
(v)
Glass apparatus which could have been used instead of the test tube
1. Conical flash
2. Beaker
3. Flat bottomed flask/round bottomed flask
4. Boiling tube
5. Measuring cylinder
(c)
(i)
I → Cork/plastic stopper
II → Double wall/silvered glass container
III → Vacuum
IV → Cork support
V → Vacuum seal
(ii)
(α)
How the thermos flask minimize heat loss or gain through conduction
1. Presence of cork
2. Absence of medium/Presence of vacuum
(β)
How the thermos flask minimize heat loss or gain through convection
Absence of medium/Presence of vacuum
(γ)
How the thermos flask minimize heat loss or gain through radiation
The shiny/silvered surfaces of the double wall of thermos flask prevents heat loss/gain by radiation.
(iii)
Uses of the thermos flask
1. It is used to keep cold or hot substances
2. It is used to keep substances at a specific temperature
(d)
(i)
I → Funnel
II → Cotton wool
III → Measuring/graduated cylinder
IV → Water/filtrate
(ii)
(α)
highest water holding capacity → Soil sample Z
(β)
least water holding capacity → Soil sample X
(iii)
Names of the three soil types
X → Sandy soil
Y → Loamy soil
Z → Clayey soil
(iv)
An experiment to demonstrate the water holding/porosity of the soil
4.
(a)
(i)
Mention the three states of matter.
(ii)
State the two methods by which one state can be converted to another.
(b)
A bag of cement is pulled along a smooth horizontal floor with a horizontal force of 1000 N.
If the work done is 100,000 J, calculate the distance through which the bag is pulled.
(c)
(i)
Draw the side view of a bony fish and label the parts.
(ii)
Explain how the fish takes in oxygen.
(iii)
For each of the following animals name two parts which help it to live in its environment
α)
Bird
β)
Fish
(a)
(i)
The three states of matter
Solid, liquid and gas.
(ii)
Methods by which one state can be converted to another
1. Melting
2. Boiling
3. Evaporation
4. Freezing
5. Condensation
6. Sublimation
(b)
Work done = Force x Distance
Work done = 100000 J
Force = 1000 N
100000 J = 1000 N x Distance
Divide both sides by 1000 N
Distance = = 100 m
(c)
(i)
Labelled parts of the side view of a body fish
(ii)
How the fish takes in oxygen
1. Water enters the mouth and passes over the gills
2. The blood in the gills absorbs the oxygen dissolved in the water
(iii)
α)
Parts of the bird which help it to live in its environment
1. Wings
2. Feet
3. Feathers
4. Air sacs
5. Beak
6. Hollow bones
7. Tail
β)
Parts of the fish which help it to live in its environment
1. Fins
2. Gills
3. Scales
4. Lateral line
5. Tail
6. Mouth
7. Swim bladder
5.
a)
An atom Y has atomic number 12. It loses two electrons in order to be stable.
i)
State the proton number of the atom before it loses electrons.
ii)
State the electron number of the atom:
α)
before it loses electrons.
β)
after losing electrons.
iii)
Name the type of ion formed by the atom when it loses two electrons.
b)
Name four farming system in crop production.
c)
i)
What is dispersal of seed?
ii)
State two characteristics of seeds dispersed by wind.
d)
Explain the term forward bias of a p-n junction diode.
a)
i)
In a neutral atom, number of electrons = number of protons
12 electrons = 12 Protons
Proton number = 12
ii)
α)
Electron number before losing 2 electrons
Electron number = 12
β)
Electron number after losing 2 electrons
Electron number = 12 - 2 = 10
iii)
Type of ion formed after losing 2 electrons
Cation/positively charged ion is formed after losing the two electrons
b)
Farming systems in crop production
1. Crop rotation
2. Land rotation
3. Monoculture
4. Mono cropping
5. Mixed cropping
6. Shifting cultivation
7. Mixed farming
8. Organic farming
9. Ecological farming/Eco-farming
c)
i)
Dispersal of seed is a process by which seeds are carried away from the parent plant.
ii)
Characteristics of seed dispersed by wind
1. Seeds are very small
2. They are very light
3. They have hair
4. They have wing-like structures
d)
Forward bias is when the positive terminal of an electric source is connected to the p-type of the diode and the negative terminal of the source is connected to the n-type of the diode resulting in the flow of charges or current.
6.
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