KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Soluble digested food substances enter the blood of the human body by a process called
A.
absorption.
B.
egestion.
C.
excretion.
D.
ingestion.
Answer: A
2.
Which of the following processes should be carried out first when separating a mixture of sand and common salt?
A.
crystallization of the salt
B.
dissolution of the salt
C.
distillation of the solvent
D.
filtration of the mixture
E.
sublimation of the solute
Answer: B
3.
A group of stars form
A.
The universe
B.
The atmosphere
C.
The solar system
D.
The planetary system
E.
A galaxy
Answer: E
4.
The process used to separate a mixture of iron filings and sulphur is
A.
magnetic attraction
B.
sublimation
C.
distillation
D.
evaporation
Answer: A
By magnetization we can separate sulfur and iron fillings. Take a magnet near to the mixture it will attract iron fillings and the remaining thing will be sulfur.
5.
The type of lever shown above is a
A.
first class lever.
B.
second class lever.
C.
third class lever.
D.
combination of first and second class levers.
Answer: C
First class → Pivot/Fulcrum at the middle
Second class → Load at the middle
Third class → Effort at the middle
In summary PLE which is the last three letters of PEOPLE if you may forget in an examination.
6.
Canned foods and drinks have expiry dates on them. The hazard involved in taking an expired drink is
A.
food poisoning.
B.
impaired hearing.
C.
poor circulation of blood.
D.
suffocation.
Answer: A
7.
The process by which water vapour moves through the stomata of leaves into the atmosphere is known as
A.
absorption.
B.
diffusion.
C.
osmosis.
D.
transpiration.
Answer: D
8.
The following processes are chemical changes except
A.
crumpling of paper.
B.
burning of wood.
C.
mixing of an acid and a base.
D.
rusting of iron.
Answer: A
For chemical change, new substances are formed and the process is mostly irreversible.
Only crumpling of paper is physical change since no substance is formed. Crumpled paper is still paper.
9.
The portion of air which is used in burning is
A.
nitrogen
B.
water vapour
C.
oxygen
D.
carbon dioxide
E.
inert gas
Answer: C
10.
The Central Nervous System consists of
A.
the brain and the spinal cord
B.
the brain and the ears
C.
the spinal cord and eyes
D.
the brain, eyes and ears
E.
eyes, ears, skin and spinal cord
Answer: A
11.
Benedict's solution was added to a mixture in a test tube and it turned brick red when heated. The mixture is likely to contain
A.
glucose.
B.
oil.
C.
protein.
D.
vitamin
Answer: A
Benedict Solution Test
Benedict’s test is a chemical test that can be used to check for the presence of reducing sugars such as glucose in a given analyte.
When there is a presence of a reducing sugar, the mixture turns brick red.
12.
A poultry farmer observed that the layers were producing thin-shelled eggs.
Use this information to answer the question below
What ingredient could be added to the feed to correct the defect?
A.
Maize
B.
Soya bean meal
C.
Cowpea
D.
Oyster shell meal
Answer: D
The defect is mostly caused by deficiency of calcium and can be corrected by feeding the layers with meal containing calcium.
13.
Which of the following organisms is a parasite on plants?
A.
Bee
B.
Butterfly
C.
Capsid
D.
Red ant
E.
Tick
Answer: C
14.
One way of ensuring that organisms are not endangered is to
A.
allow them to be hunted.
B.
allow their predators to outnumber them.
C.
protect their habitats.
D.
pollute their habitats.
Answer: C
15.
The type of cloud that gives rain is
A.
cumulus.
B.
cirrus.
C.
nimbus.
D.
stratus.
Answer: D
16.
Which of the following controls the amount of light that enters the eyes?
A.
The cornea
B.
The iris
C.
The lens
D.
The pupil
E.
The retina
Answer: B
17.
A piece of stone sinks in water because
A.
its density is the same as that of water
B.
it is able to displace its own weight of water
C.
its density is less than that of water
D.
its density is greater than that of water
E.
the water contains air which allows the stone to sink
Answer: D
18.
The human male sex cell that takes part in reproduction is the
A.
penis
B.
scrotum
C.
sperm
D.
testis
Answer: C
19.
Which of the following energy changes takes place in ringing bell?
A.
Potential to kinetic
B.
Potential to sound
C.
Mechanical to sound
D.
Sound to light
Answer: C
The mechanical energy is used to vibrate the metallic body of the ring-bell. When the bell vibrates, it produces sound energy.
20.
Which of the following nutrients is need by plants in small quantities?
A.
Calcium
B.
Iron
C.
Potassium
D.
Magnesium
Answer: B
21.
Which of the following life processes leads to the release of energy?
A.
Absorption of food
B.
Digestion of food
C.
Photosynthesis
D.
Respiration
Answer: D
Respiration is the biochemical process in which the cells of an organism obtain energy by combining oxygen and glucose, resulting in the release of carbon dioxide, water, and ATP (the currency of energy in cells)
22.
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
23.
The outer ear is also referred to as
A.
cochlea
B.
tympanum
C.
pinna
D.
incus
E.
malleus
Answer: C
24.
A mixture of alcohol and water can best be separated by
A.
filtration.
B.
condensation.
C.
distillation.
D.
evaporation.
Answer: C
Distillation is the process of separating the components of a liquid mixture through selective evaporation and condensation. The basis of separation is the difference in the vapor pressures (volatilities) of the respective components.
25.
An omnivore is an animal that feeds on
A.
raw food.
B.
fresh foods.
C.
cooked foods.
D.
all kinds of food.
Answer: D
26.
One function of engine oil in the engine of a tractor is to
A.
warm the engine.
B.
enhance air intake.
C.
ensure proper mixing of fuel.
D.
lubricate the engine parts.
Answer: D
27.
A magnet can attract all these substances except
A.
drawing pins.
B.
glass.
C.
steel.
D.
iron nails.
Answer: B
28.
Which of the following activities illustrates distillation?
A.
Preparation of soup
B.
Preparation of akpeteshie
C.
Tapping of palm wine
D.
Preparation of starch
E.
Freezing of water
Answer: B
29.
Which of the following processes is a physical change?
A.
Rusting of iron.
B.
Burning of wood.
C.
Formation of water from hydrogen and oxygen.
D.
Solidification of water into ice.
Answer: D
For a physical change, no new substance is formed. All the options except the "solidification of water into ice" are chemical changes since new substances are formed. Rusting of iron form oxidized iron, burning of wood forms ashes, chemical reaction of hydrogen and oxygen forms water.
In chemical change too, the process is not reversible but a physical change is reversible. For the solidification of water into ice, the ice could be melt back to water.
30.
Which of the following is used to measure the potential difference across a resistor in an electrical circuit?
A.
A galvanometer
B.
A rheostat
C.
A meter bridge
D.
A voltmeter
E.
An ammeter
Answer: D
31.
Which of the following sets of devices operate on the principle of magnetism?
A.
Loudspeakers, compass, alarms
B.
Loudspeakers, alarms, LCD TV
C.
Compass, loudspeakers, LCD TV
D.
Compass, loudspeakers, LCD TV
Answer: A
32.
Which of the following associations between two organisms is always beneficial to both?
A.
Commensalism
B.
Mutualism
C.
Saprophytism
D.
Symbiosis
Answer: B
33.
Which of the following animal parasites could be controlled by hand picking?
A.
Liver fluke
B.
Tapeworm
C.
Tick
D.
Roundworm
Answer: C
34.
When testing for proteins in a food substance using Fehling's solution, the expected colour change is
A.
blue.
B.
purple.
C.
blue-black.
D.
brick-red.
Answer: D
35.
A drawing of magnetic line of force provides information on the
A.
source of the field.
B.
type of magnet.
C.
strength of the field.
D.
length of the magnet.
Answer: A
36.
Calculate the work done when a weight of 20.0 N is lifted vertically through a distance of 10.0 cm
A.
2000.0 J
B.
200.0 J
C.
20.0 J
D.
2.0 J
E.
0.2 J
Answer: D
Work done = Force x Distance
Force = 20.0 N
Distance = 10.0 cm
The S.I unit of distance is metre. Hence convert the 10.0 cm to metre by dividing by 100
10 cm = m
Work done = 20 N x m = 2 J
Notes:
1. 20 divides itself 1 time and 100, 5 times
2. 5 divides itself 1 time and 10, 2 times
37.
For healthy growth, the food we eat must contain
A.
fat, oils and proteins
B.
important nutrients in the right proportions
C.
a good proportion of carbohydrates and proteins
D.
mineral salts, vitamins and water
E.
mineral salts in right proportion
Answer: B
38.
All of the following promote Primary Health except
A.
keeping the surroundings clean
B.
effective disposal of waste
C.
personal hygiene
D.
balanced diet
E.
bleaching the skin
Answer: E
39.
Oxygen is made available to all cells of the human body by the
A.
plasma.
B.
platelets.
C.
white blood cells.
D.
red blood cells.
Answer: D
40.
An example of a crop that reduces the fertility of the soil rapidly is
A.
Beans
B.
Legumes
C.
Groundnuts
D.
Cassava
E.
Plantain
Answer: D
THEORY QUESTIONS
1.
(a)
For each of the following diseases, name the causative organism and one method of prevention.
(i)
Cholera
(ii)
Bilharzia
(iii)
Malaria
(iv)
Tuberculosis
(b)
Show how you would separate each of the following mixtures:
(i)
Common salt and sand
(ii)
Muddy water
(c)
Explain why the planet and their moons move around the sun but they do not clash.
(d)
Give two uses of the sun's energy in everyday life.
(a)
| Disease | Causative Organism | Prevention |
| Cholera | Vibrio Cholerae |
1. Drinking of pure/boiled water
|
| Bilharzia | Schistosoma |
1. Keeping the surroundings clean
|
| Malaria | Plasmodium |
1. Using mosquito nets
|
| Tuberculosis | Tuberculo Bacillus |
1. Avoiding over crowding
|
(b)
(i)
Separation of common salt and sand
1. Dissolve the common salt by adding water to the mixture in a beaker
2. Stir the mixture
3. Filter the sand from the salt solution using filter paper in a funnel
4. Using a Bunsen burner, heat the salt solution to retrieve the salt in an evaporating dish
(ii)
Separation of muddy water
1. Fold a filter paper into a funnel
2. Pour the muddy water into the funnel and filter
3. The water is then collected by a beaker and sand is left on the filter paper
(c)
Why the planet and their moons move around the sun but they do not clash
The gravitational force of attraction of the sun on the planets and their moons provides the centripetal force that keeps the planets and their moons moving in their respective orbits around the sun without clashing
(d)
Uses of the sun's energy in everyday life
1. It provides energy for photosynthesis in plants
2. It generates energy for solar panels
3. It is a source of light
4. It helps the skin produce vitamin D as it shines on the skin
5. It is used for drying clothes
2.
(a)
(i)
What is the difference between self-pollination and cross-pollination?
(ii)
Name two agents of cross-pollination.
(b)
A ray of light strikes the surface of a plane mirror at an oblique angle.
Draw a ray diagram to show each of the following:
(i)
the normal
(ii)
the incident ray
(iii)
the reflected ray
(iv)
the angle of incidence
(v)
the angle of reflection
(c)
Give one property of the image formed by a plane mirror.
(d)
(i)
Carbon dioxide is prepared in the laboratory by pouring some dilute hydrochloric acid on calcium carbonate. Give a balanced equation for this reaction.
(ii)
How would you test for carbon dioxide?
(iii)
Give one use of carbon dioxide.
(a)
(i)
Difference between self-pollination and cross-pollination
Self-pollination is the transfer of pollen grains from the anther of a flower to the stigma of the same flower whereas cross-pollination is the transfer of pollen grains from the anther of a flower to the stigma of another flower on another plant of the same species.
(ii)
Agents of cross-pollination
1. Bees
2. Birds
3. Bats
4. Insects
5. Wind
6. Water/rain
7. Man
(b)
(c)
Properties of the 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
(d)
(i)
CaCO3 + 2HCl → CaCl2 + H2O + CO2
(ii)
How to test for carbon dioxide
1. Pass the gas through limewater
2. The colourless limewater turns milky/chalky when there is the presence of carbon dioxide
(iii)
Uses of carbon dioxide
1. Used in fruit preservation
2. Used in the manufacturing of soft drinks
3. Used as fire extinguisher
4. Used as refrigerant
3.
(a)
(i)
Name the process by which green plants manufacture their food.
(ii)
State three factors necessary for this process to take place.
(b)
(i)
Mention the device which could be used to carry a heavy body onto a truck.
(ii)
Name four simple levers used in everyday life.
(iii)
Draw a lever and label the pivot, effort and load on it
(c)
(i)
Using any ammonium compound, describe the general preparation of ammonia gas.
(Diagram of apparatus is not required)
(ii)
Write the chemical equation for the preparation
(a)
(i)
The process by which green plants manufacture their food is called photosynthesis
(ii)
Factors necessary for photosynthesis
1. Chlorophyll/green matter in the leaf
2. Sunlight/light
3. Water (H2O)
4. Mineral salts
5. Carbon dioxide/Carbon (IV) oxide/ (CO2)
6. Suitable temperature
(b)
(i)
Devices that could be used to carry a heavy body onto a truck
1. Inclined plane
2. Pulley
3. Crane
4. Lifting magnets/Electromagnet
5. Forklift
(ii)
Simple levers used in everyday life
1. Wheel barrow
2. Can opener
3. A pair of scissors
4. Nutcrackers
5. Forceps
6. Sugar tong
7. Bottle opener
8. Crowbar
9. Claw hammer
10. A pair of pliers
11. Knife
12. Paper cutter
13. A pair of pincers
14. See saw
(iii)
Note: any of the above diagrams represents labelled lever.
(c)
(i)
General preparation of ammonia gas
1. Ammonia gas can be prepared by heating powdered ammonium chloride and sodium hydroxide/calcium hydroxide
2. The ammonia gas produced is dried by passing it through calcium oxide
(ii)
Chemical equation for the preparation of ammonia gas
NH4Cl + NaOH → NaCl + H2O + NH3
OR
2NH4Cl + Ca(OH)2 → CaCl2 + 2H2O + 2NH3
4.
(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
5.
(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
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.