KUULCHAT
SCIENCE MOCK
1.
An advantage of practicing organic farming is that it
increases soil fertility.
reduces pest infestation.
reduces toxicity levels in plants.
increases resistance to plant disease.
Answer: D
Organic Farming
Organic farming can be defined as an agricultural process that uses biological fertilizers and pest control acquired from animal or plant waste.
Advantages of organic farming
1. It creates higher natural levels of resistance to pests and disease
2. This farming process supports a healthier soil and supports pollinators.
3. There are no worries about genetically modified foods with organic farms
4. The working environment for organic farmers is healthier
5. Organic farmers can often create their own fertilizers at their farming location
2.
The efficiency of a machine is always less than 100% because part of the energy input is used to
stop the machine after working.
perform useful work of the load.
overcome friction.
lift the machine up.
Answer: C
3.
Which of the following statements about a transistor is correct?
It can be used to amplify current.
It is similar to three diodes.
It consists of two leads only.
It has three junctions.
Answer: A
4.
When living organisms die, the mineral salts in their bodies become available to the soil through the process of
evaporation
sedimentation
defecation
decay
Answer: D
5.
Which of the following statements about the negative use of Science and Technology is correct? It
promotes good health.
promotes easy communication.
enable humans to use less energy in working.
creates things that are dangerous to the environment.
Answer: D
6.
The blood vessel that carries oxygenated blood from the lungs to the heart is unknown as
pulmonary artery.
pulmonary vein.
vena cana.
aorta.
Answer: B
7.
Which of the following farm animals is/are housed in a hutch?
I. Goats
II. Pigs
III. Rabbits
I only
III only
I and II only
II and III only
Answer: B
8.
When a person jumps up, he/she is able to come down because of the
pull of the earth's gravitational force.
pull of the earth's magnetic force.
resistance of the earth's atmosphere to the upward motion.
pressure of the earth's atmosphere on the person.
Answer: A
9.
The central nervous system is made up of the
brain and nerves.
brain and spinal cord.
veins and nerves.
skull and spine.
Answer: B
10.
Heat from the sun by
I. Conduction
II. Convention
III. Radiation
I only
II only
III only
I, II and III
Answer: C
Radiation: is the transfer of heat energy through space by electromagnetic radiation.
Conduction: is the transfer of heat energy from one substance to another or within a substance
Convection: is the transfer of heat energy in a fluid.
11.
Casual and loose sex life can result in the spread of
AIDS.
cholera.
poliomyelitis.
malaria.
tuberculosis.
Answer: A
12.
The brain and the spinal cord are part of the
digestive system
circulatory system
respiratory system
nervous system
Answer: D
13.
A stick which is partially immersed in water appeared to be bent due to
absorption.
reflection.
refraction.
transmission.
Answer: C
14.
Which of the following products is not excreted by the skin?
Water
Sweat
Urea
Common salt
Answer: E
15.
A substance of mass 10 kg has a density of 2.0 kgm-3. Calculate its volume.
0.2 m3
5.0 m3
10.0 m3
20.0 m3
Answer: B
Density =
Density x Volume = Mass
Dividing both sides by Density
Volume =
Volume =
Volume = 5 m3
16.
An example of a mixture is
sodium sulphate.
hydrogen chloride.
ammonia.
salt solution
Answer: D
Only salt solution is a mixture (mixture of salt and water). The rest are all compounds.
17.
The property of a rock that makes it different from water is that it has
fixed volume.
fixed shape.
density.
mass
Answer: B
A rock is a solid and water is a liquid. A rock will therefore have the properties of solid.
Matter
Matter is anything that takes up space and can be weighed. In other words, matter has volume and mass.
States of matter and their properties
Solids – relatively rigid, definite volume and shape. In a solid, the atoms and molecules are attached to each other. They vibrate in place but don’t move around.
Liquids – definite volume but able to change shape by flowing. In a liquid, the atoms and molecules are loosely bonded. They move around but stay close together.
Gases – no definite volume or shape. The atoms and molecules move freely and spread apart from one another.
Plasma is sometimes referred to as a fourth state of matter. While it’s similar to a gas the electrons are free in a cloud rather than attached to individual atoms.
18.
Animals that live in grasslands include
lions and giraffes
monkeys and tigers
antelopes and hares
woodpeckers and baboons
Answer: C
19.
The function of the white blood cells in humans is to
produce haemoglobin.
ensure blood clot during an injury.
produce antibodies to engulf disease-causing organisms.
produce digestive enzymes.
Answer: C
White blood cells produce antibodies to fight the infection and help with other immune responses.
20.
Which of the following activities is a reflex action?
Eating
Fighting
Learning
Sneezing
Writing
Answer: D
Reflex action is a sudden and involuntary response to stimuli. It helps organisms to quickly adapt to an adverse circumstance that could have the potential to cause bodily harm or even death. Pulling our hands away immediately after touching a hot or cold object is a classic example of a reflex action.
21.
Which of the following processes can be used to obtain local gin from palm wine?
Evaporation
Condensation
Distillation
Filtration
Answer: C
22.
Urinating in rivers is a common manner of spreading diseases such as
cholera
bilharzia
malaria
measles
Answer: B
23.
Which of the following soil type has the highest capillarity?
Clay
Loam
Sand
Silt
Answer: A
One of the problems with clay soil is its slow permeability resulting in a very large water-holding capacity. Because the soil particles are small and close together, it takes water much longer to move through clay soil than it does with other soil types. Clay particles then absorb this water, expanding as they do so and further slowing the flow of water through the soil. This not only prevents water from penetrating deep into the soil but can also damage plant roots as the soil particles expand.
24.
Sperms produced by the testes in humans are temporarily stored in the
epididymis.
prostate gland.
seminal vesicles.
sperm duct.
Answer: A
25.
The process whereby soil is formed by the breakdown of rocks is called
composting.
erosion.
leaching.
weathering.
Answer: D
26.
Which of the following organs is the center of the Central Nervous System?
Kidney
Liver
Heart
Brain
Answer: D
27.
Which of the following substances is a mixture?
Sodium chloride
Sulphur dioxide
Sugar solution
Carbon dioxide
Answer: C
28.
The S.I unit for density is
ms-1
ms-2
kg m-3
m3kg-1
Answer: C
29.
Which of the following changes does not occur in a girl at the age of puberty?
The breasts develop
The hips widen
Menstruation
The teeth becomes whiter
Answer: D
30.
The following substances are mixtures except
air.
carbon dioxide.
salt solution.
smoke.
Answer: B
Carbon dioxide is a compound with the chemical formula CO2.
31.
The lion is a typical example of
a pet
a carnivore
an omnivore
a herbivore
Answer: B
32.
An example of a derived quantity is
length
mass
temperature
volume
Answer: D
33.
In which of the following vegetation of Ghana does millet and sorghum grow well?
Costal savannah
Forest zone
Guinea savannah
Transition zone
Answer: C
34.
The organ in the human body which is responsible for the removal of urea is the
heart.
kidney.
lung.
liver.
bladder.
Answer: B
35.
Which of the following diseases is caused by a fungus?
Typhoid
Leprosy
Ringworm
Measles
Answer: C
36.
A metal block has a mass of 0.1kg. Calculate its volume if the density is 1.0 kgm-3.
0.01 m3
0.10 m3
1.00 m3
10.00 m3
Answer: B
Density =
Density x Volume = Mass
Dividing both sides by Density
Volume =
Volume =
Volume = 0.1 m3
37.
Which of the following substances are major components of human blood?
I. Hormones
II. Platelets
III. Plasma
IV. White blood cells
I and II only
II and III only
III and IV only
II, III and IV only
Answer: D
The four major components of human blood are plasma, red blood cells, white blood cells, and platelets. These components work together to transport oxygen and nutrients, fight infection, and help with blood clotting.
Plasma
The liquid component of blood, making up about 55% of its volume. It's primarily water, but also contains proteins, salts, nutrients, and waste products.
Red Blood Cells (Erythrocytes)
Responsible for carrying oxygen from the lungs to the rest of the body. They contain hemoglobin, a protein that binds to oxygen.
White Blood Cells (Leukocytes)
Part of the body's immune system, fighting off infections and diseases. There are different types of white blood cells, including lymphocytes, monocytes, and granulocytes.
Platelets (Thrombocytes)
Small cell fragments that help with blood clotting, preventing excessive bleeding when blood vessels are damaged.
38.
Oxygen from the air is able to get into the blood by
capillarity.
diffusion.
osmosis.
suction.
Answer: B
The oxygen in inhaled air passes across the thin lining of the air sacs and into the blood vessels. This is known as diffusion. The oxygen in the blood is then carried around the body in the bloodstream, reaching every cell.
39.
The parasite that is found on dogs is
capsid.
guinea worm.
plasmodium.
tapeworm.
Tick.
Answer: E
40.
Which of the following organisms attacks crops in storage?
Crickets
Grasshoppers
Millipedes
Weevils
Answer: D
A storage pest is an insect or other animal that damages or destroys stored food or other stored valuable organic matter.
Grain borers, weevils and Angoumois grain moths are able to feed on whole, healthy grains, they are considered storage pests
a)
i)
What is a deficiency disease?
ii)
Give two deficiency diseases and their causes.
b)
i)
State the importance of excretion in living organisms.
ii)
Name two excretory organs of the human body and the substances they excrete.
c)
i)
Explain why gases are more compressible than solids.
ii)
Give two areas where the compressible nature of a gas is applied
d)
A piece of stone is dropped from a height to the ground.
State the energies possessed by the stone
i)
just before it was released from the maximum point;
ii)
midway between the fall;
ii)
just before it hit the ground.
a)
i)
Deficiency disease is a condition/disorder caused by the absence/lack/inadequate supply/inadequate intake of a particular nutrient/food substance.
ii)
Deficiency diseases associated with diet and their causes
| Disease | Cause |
| Rickets | Lack of vitamin D/calcium |
| Kwashiorkor | Lack of protein |
| Goitre | Lack of iodine |
| Night blindness | Lack of vitamin A |
| Scurvy | Lack of vitamin C (ascorbic acid) |
| Beriberi | Lack of vitamin B1 |
| Dermatitis | Lack of vitamin B2 |
| Pellagra | Lack of vitamin B3 |
| Marasmus | Lack of protein and carbohydrates |
| Anaemia | Lack of iron/folic acid |
| Prolonged bleeding | Lack of vitamin K |
| Infertility | Lack of vitamin E |
b)
i)
Importance of excretion in living organisms
1. If metabolic waste substances/products were not removed, they would be injurious/poisonous to the body
2. It removes waste products from the body
ii)
| Excretory organs | Excretory products |
| Skin | Sweat |
| Kidney | Urine |
| Lungs | Carbon dioxide, water vapour |
| Liver | Bile pigments/cholesterol |
c)
i)
Why gases are more compressible than solids
The particles/molecules of gases are far apart whereas in solids they are more compact.
ii)
Areas where the compressible nature of a gas is applied
1. Pumping of lorry tyres/football
2. Putting gas in bottled minerals
3. Blowing of balloons
4. Putting gas in bottles/gas cylinders
d)
i)
Potential energy
ii)
Potential energy and Kinetic energy
ii)
Kinetic energy
(a)
(i)
What is debeaking?
(ii)
Give two reasons why debeaking in poultry birds is important.
(b)
(i)
A steel needle carefully placed on the surface of water floats. What type of force made the steel needle to float?
(ii)
Name three substances that could be added to the water to make the steel needle to sink.
(c)
(i)
Explain why gold is preferred to iron in the making of jewelleries.
(ii)
State one way of preventing rusting.
(d)
(i)
State two elements of climate.
(ii)
Name the equipment used to measure each of the elements stated in (i) above.
(a)
(i)
Debeaking is the partial removal/trimming of the beak of poultry/domestic bird.
(ii)
Reasons why debeaking in poultry birds is important
1. To prevent vent pecking
2. To check feather pecking/plucking
3. To reduce wastage of feed
4. To check egg eating
5. To check cannibalism
(b)
(i)
Surface tension
(ii)
Substances to reduce surface tension
1. Kerosene
2. Oil
3. Soap/detergent
4. Diesel
5. Petrol
(c)
(i)
Why gold is preferred to iron in the making of jewelleries
Gold does not corrode/rust/react with water and oxygen/air/moisture and therefore maintains/keeps its nature/colour/lustre
(ii)
Ways of preventing rusting
1. Greasing/oiling/lubricating
2. Painting
3. Electroplating
4. Galvanizing
5. Alloying
6. Tin plating
7. Plastic coating
8. Sacrificial protection/cathodic protection
(d)
| i | Elements of climate | ii | Equipment used for measurement |
| Temperature | Thermometer | ||
| Rainfall | Rain gauge | ||
| Humidity | Hygrometer | ||
| Wind direction | Wind vane | ||
| Wind speed | Anemometer | ||
| Intensity of light/sunlight | Photometer/Light meter | ||
| Atmospheric pressure | Barometer | ||
(a)
State two important components each of the soils that helps:
(i)
Crops to grow well;
(ii)
To maintain good soil structure.
(b)
(i)
Explain how energy in a windmill is obtained
(ii)
State one source of renewable energy.
(c)
(i)
Explain why steel is preferred to iron in building construction.
(ii)
State two ways of preventing rusting.
(d)
State three ways of preventing indigestion.
(a)
Important components of the soils that helps
(i)
Crops to grow well
1. Nutrients/humus
2. Air/living organisms
3. Water
(ii)
To maintain good soil structure
1. Soil particles
2. Organic matter/humus
3. Living organisms
(b)
(i)
How energy in a windmill is obtained
When the wind blows, the windmill turns the propeller-like blades of a turbine around a rotor, which spins a generator, which creates electricity (energy).
(ii)
Sources of renewable energy
1. Sun
2. Wind
3. Water/hydropower
4. Biomass
5. Tides
6. Geothermal source/heat from the ground
(c)
(i)
Why steel is preferred to iron in building construction
Steel is preferred to iron because it has higher resistance to corrosion (rusting) than steel and has a high tensile strength
(ii)
Ways of preventing rusting
1. Painting
2. Plating or galvanizing
3. Alloying
4. Greasing or oiling
5. Keeping metal at dry place
6. Cathodic protection
(d)
Ways of preventing indigestion
1. Avoid eating late
2. Avoid eating acidic foods
3. Avoid sleeping immediately after meal
4. Chewing food properly
5. Avoid spicy food
6. Avoid eating at regular intervals
7. Avoid eating too much food at a time/eat small food at a time
8. Limit food or drinks that contain caffeine
9. Quit smoking
10. Drink beverages after meal and not during meals
(a)
List in the correct order, the organs through which food passes from the mouth to the anus.
(b)
State the components of a balanced ration for feeding poultry.
(c)
Predict the products formed when:
(i)
magnesium solution reacts with dilute hydrochloric acid;
(ii)
potassium reacts with water.
(d)
(i)
State two effects of heat on a substance.
(ii)
Potassium permangante crystals are dropped into a beaker of water and warmed:
(α)
State what would be observed;
(β)
State the phenomenon demonstrated in (α).
(a)
Order of food passes from the mouth to the anus
Mouth → oesophagus → stomach → small intestine → large intestine → anus
(b)
Components of a balanced ration
1. Carbohydrates
2. Protein
3. Fats and oil
4. Minerals
5. Vitamins
6. Water
(c)
Products formed
(i)
Magnesium chloride and hydrogen/MgCl2 and H2
Illustration
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
(ii)
Potassium hydroxide and hydrogen/KOH and H2
Illustration
2K(s) + 2H2O → 2KOH(aq) + H2(g)
(d)
(i)
Effects of heat on a substance
1. Change of state/melts/vapourises
2. Expansion/contraction/change in shape
3. Increasing temperature/decreasing temperature
4. Increase in pressure
(ii)
Potassium permangante crystals dropped into a beaker of water and warmed:
(α)
Warmed coloured water moves from the bottom of the beaker upwards
The solution turns to purple in color because of a process called diffusion.
Diffusion is the movement of molecules or atoms from high concentrated region to low concentrated region.
(β)
Phenomenon demonstrated
Heat transfer by convection/ Diffusion
(a)
(i)
Define the terms humidity and wind
(ii)
Name the instruments used to measure humidity and the speed of wind
(b)
(i)
What is a galaxy?
(ii)
Give one example of galaxy.
(c)
State three methods by which food can be preserved.
(d)
Explain why it is better to wear white clothes than black clothes on a sunny day.
(e)
Write down the names of the new substances formed when the following substances are allowed to react:
(i)
Sodium hydroxide and dilute sulphuric acid
(ii)
Calcium carbonate and dilute hydrochloric acid
(iii)
Ammonia and dilute sulphuric acid
(a)
(i)
Humidity is the amount of water vapour in the atmosphere
Wind is air in motion
OR
Wind is the movement of air
(ii)
Humidity is measured with hygrometer and the speed of wind is measured with anemometer
(b)
(i)
A galaxy is a collection of stars in the universe
(ii)
Milky way galaxy
(c)
Methods by which food can be preserved
1. Drying
2. Smoking
3. Canning
4. Boiling
5. Frying
6. Bottling
7. Freezing
8. Salting
(d)
Why it is better to wear white clothes than black clothes on a sunny day
1. White clothes are good emitters (radiators) and bad absorbers of heat than dark/black clothes
2. Hence white clothes remain relatively cool as compared to dark/black clothes on a sunny day
(e)
Names of the new substances formed when the following substances are allowed to react
(i)
Sodium hydroxide and dilute sulphuric acid
Reaction: 2NaOH + H2SO4 → Na2SO4 + 2H2O
New substances: Sodium sulphate/sodium tetraoxosulphate (VI) and water
(ii)
Calcium carbonate and dilute hydrochloric acid
Reaction: CaCO3 + 2HCl → CaCl2 + CO2 + H2O
New substances: Calcium chloride, carbon dioxide/carbon (IV) oxide and water
(iii)
Ammonia and dilute sulphuric acid
Reaction: 2NH3 + H2SO4 → (NH4)2SO4
New substances: Ammonium sulphate/ammonium tetraoxosulphate (VI)
a)
Define each of the following terms:
i)
alloy
ii)
diffusion
iii)
colloid
b)
Give two examples each of:
i)
alloy
ii)
colloid
c)
i)
What is pollution?
ii)
List two pollutants each of:
α)
air
β)
water
γ)
land
d)
A coconut of weight 50 N hangs 15 m above the ground.
i)
Name the type of energy possessed by the coconut.
ii)
Calculate the value of this energy
a)
i)
An alloy is a uniform/homogenous mixture of two or more metals or a metal and non-metal.
ii)
Diffusion is the process whereby molecules/particles of a liquid/gas move from a region of higher concentration to a region of a lower concentration until they are uniformly spread throughout an occupied space.
iii)
A colloid is a suspension in which the suspended particles are very small in size but bigger than the molecules of the solvent and are permanently suspended/does not settle on standing.
b)
i)
Examples of alloy
1. Bronze
2. Brass
3. Steel
4. Solder
5. Duralumin
6. Cupronickel
ii)
Examples of colloid
1. Emulsion paint
2. Fog
3. Smoke
4. Milk
5. Toothpaste
6. Mist
7. Soap lather
8. Clay in water
9. Chalk in water
10. Gel
11. Aerosols
c)
i)
Pollution is the release of toxic/harmful/poisonous substances into the environment.
ii)
α)
Pollutants of air
1. Smoke
2. Exhaust fumes
3. Dust
4. Carbon monoxide
5. Sulphur (IV) oxide (SO2)
6. Sulphur (VI) oxide (SO3)
β)
Pollutants of water
1. Untreated sewage/waste
2. DDT
3. Fertilizer
4. Detergents
5. Factory wastes
6. Oil spillage/discharge from oil tankers
γ)
Pollutants of land
1. Scrap metals
2. Empty tins
3. Polyethylene bags
4. Bottles
5. Sewage
6. Refuse
7. Mining and quarrying waste
d)
i)
Potential energy
ii)
Potential Energy = Mass (m) x Acceleration due to gravity (g) x Height (h)
Weight = Mass x Acceleration due to gravity
Potential Energy = Weight x Height
Weight = 50 N
Height = 15 m
Potential Energy = 50 N x 15 m = 750 J