KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
The heat of the sun reaches the earth through
A.
radiation
B.
convection
C.
conduction
D.
both radiation and conduction
E.
both radiation and convection
Answer: A
2.
Which of the following organisms is an ecto-parasite of animals?
A.
Fleas
B.
Tapeworm
C.
Liver fluke
D.
Roundworm
Answer: A
Ectoparasite: parasites that live on the surfaces of host organisms or in the skin and do not invade the inner body
Examples of ectoparasites
Fleas, head lice and bed bugs
Endoparasite
Endoparasites are parasites which live inside a host and generally inhabit areas such as the gut, lungs, heart and blood vessels.
Examples of endoparasites
Tapeworm, fluke and roundworm
3.
Legumes are generally included in crop rotation because they
A.
are easy to uproot in preparation for the next planting season.
B.
are able to fix atmospheric nitrogen in the soil.
C.
have short life span.
D.
are good cover crops.
E.
have high market value.
Answer: B
4.
Decay is an important biological process because it brings about the
A.
formation of nutrients in living organisms
B.
manufacture of cells of living organisms
C.
production of oxygen by plants
D.
release of nutrients from dead organisms
E.
release of waste substances from bacteria
Answer: D
5.
Which of the following is a rhizome?
A.
Potato
B.
Ginger
C.
Onion
D.
Cocoyam
E.
Cassava
Answer: B
6.
Brass is an alloy of copper and
A.
aluminium.
B.
carbon.
C.
iron.
D.
tin.
E.
zinc.
Answer: E
7.
Which of the following particles constitute matter?
I. Atoms
II. Molecules
III. Ions
A.
I only
B.
II only
C.
II and III only
D.
I, II and III
Answer: D
8.
How long does it take the moon to go completely round the earth?
A.
1 day
B.
28 days
C.
30 days
D.
365 days
Answer: B
9.
Which of the following pairs of structures form part of the female reproductive system of humans?
A.
Urethra and uterus
B.
Cervix and uterus
C.
Ureter and uterus
D.
Cervix and ureter
Answer: B
10.
Which of the following is a physical change?
A.
Heating of sugar
B.
Heating of sulphur and iron filing
C.
Boiling of water
D.
Burning of magnesium ribbon
E.
Heating of potassium chlorate
Answer: C
11.
An unripe orange is said to be acidic because it
A.
has low sugar content.
B.
has bitter taste.
C.
turns red litmus paper blue.
D.
turns blue litmus paper red.
Answer: D
Acid turns blue litmus paper red. You can use the acronym BAR to remember which stands for Blue Acid Red where B stands for Blue litmus paper and A stands for Acid and R stands for Red.
Once you know that of the acid when you remember BAR, you can reverse it for the base. For a base or alkaline, red litmus paper turns blue.
12.
Caterpillar is an example of
A.
an animal parasite that feeds on plant host.
B.
a plant parasite that lives on an animal host.
C.
an animal parasite that feeds on animal host.
D.
a plant parasite that grows on plant host.
Answer: A
CATERPILLAR PARASITE
13.
The mole is the S.I unit of
A.
amount of substance.
B.
luminous intensity.
C.
temperature.
D.
mass of substance.
Answer: A
14.
Which of the following is likely to happen when the relative humidity is high?
A.
It is likely to rain
B.
It is likely to be dry
C.
It is likely to be sunny
D.
The day will be hot
E.
It will be windy
Answer: A
15.
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.
16.
An advantage of practicing organic farming is that it
A.
increases soil fertility.
B.
reduces pest infestation.
C.
reduces toxicity levels in plants.
D.
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
17.
The intermediate host of the worm that causes bilharzia is
A.
man.
B.
mosquito.
C.
tsetse fly
D.
water snail
Answer: D
18.
An example of a first class lever is
A.
bottle opener.
B.
crow bar.
C.
wheel barrow.
D.
fishing rod.
Answer: B
First Class Lever
A first-class lever has the fulcrum/pivot in the middle and the load and effort on each side of the fulcrum.
Examples of a first class lever
Pliers, scissors, a crow bar, a claw hammer, a see-saw and a weighing balance.
Second Class Lever
In second class levers the load is between the effort (force) and the fulcrum. A common example is a wheelbarrow where the effort moves a large distance to lift a heavy load, with the axle and wheel as the fulcrum.
Nutcrackers are also an example of a second class lever.
Third Class Lever
With third class levers the effort is between the load and the fulcrum, for example in barbecue tongs. Other examples of third class levers are a broom, a fishing rod, etc.
19.
Which of the following items converts chemical energy to electrical energy?
A.
Dry cell
B.
Electric bulb
C.
Loudspeaker
D.
Microphone
Answer: A
20.
A book is at rest on a table. The net force acting on the book could be described as one that
A.
is balanced.
B.
is unbalanced.
C.
is due to friction.
D.
obeys Newton's second law.
Answer: A
The forces (net forces) on the book are balanced because the gravity pulling down on the book is equal to the upward force applied by the table.
21.
Which of the following statements about the solar system is true? The
A.
sun moves round the earth
B.
planets move round the sun
C.
planets move round the moon
D.
sun moves in its orbit
E.
sun moves round the moon
Answer: B
22.
The paired fins in fishes are used for
A.
protection and diving
B.
diving and balancing
C.
balancing and control
D.
steering and diving
E.
balancing and steering
Answer: E
23.
Which of the following gases is involved in the process of rusting?
A.
H2
B.
Co2
C.
O2
D.
N2
Answer: C
The conditions necessary for rusting are water (moisture) and oxygen.
24.
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
25.
The chemical symbol of potassium is
A.
K.
B.
N.
C.
P.
D.
S.
Answer: A
26.
Which of the following statements distinguishes arteries from veins?
A.
Arteries have relatively narrow lumen while veins have relatively wide lumen.
B.
Arteries transport blood to the heart while veins carry blood away from the heart.
C.
Arteries carry deoxygenated blood while veins carry oxygenated blood.
D.
Arteries have valves while veins do not have valves.
Answer: A
27.
Which of the following illustrations shows the correct direction of the lines of force around a bar magnet?
A.
B.
C.
D.
Answer: B
The direction of magnetic lines of force of a bar magnet is from north to south pole outside the magnet as shown in figure below.
28.
The main waste products formed in plants are
A.
water, carbon dioxide and urea
B.
water, carbon dioxide and oxygen
C.
water, carbon dioxide and mineral salts
D.
water, ammonium compounds and oxygen
E.
water, ammonium compounds and carbon dioxide
Answer: D
29.
A reflex action involves the
A.
brain and muscles.
B.
brain and nerves.
C.
spinal cord and muscles.
D.
spinal cord and nerves.
Answer: D
30.
Determine the potential energy of a block of mass 2 kg placed on a building 10 m tall. [g = 10 ms-2]
A.
20 J
B.
50 J
C.
100 J
D.
200 J
Answer: D
Potential energy = mass x acceleration due to gravity x height
P.E = mgh
P.E = 2 x 10 x 10 J = 200 J
31.
The by-product of photosynthesis is
A.
carbon dioxide.
B.
starch.
C.
oxygen.
D.
water.
Answer: C
Equation of photosynthesis
6CO2 + 6H2O → C6H12O6 + 6O2.
This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.
32.
A substance of mass 10 kg has a density of 2.0 kgm-3. Calculate its volume.
A.
0.2 m3
B.
5.0 m3
C.
10.0 m3
D.
20.0 m3
Answer: B
Density =
Density x Volume = Mass
Dividing both sides by Density
Volume =
Volume =
Volume = 5 m3
33.
Which of the following statements about clayey soil is not true? It
A.
swells when dry and shrinks when wet.
B.
has high water retention.
C.
is difficult to plough when dry
D.
is compact when dry.
Answer: A
Clayey soil rather swells when wet and shrinks when dry
34.
Which of the following leaves are sensitive to touch?
A.
Cassava leaves
B.
Mimosa leaves
C.
Orange leaves
D.
Palm leaves
E.
Tomato leaves
Answer: B
35.
Which of the following particles can be found in the nucleus of an atom?
A.
Electrons and protons
B.
Electrons and shells
C.
Neutrons and electrons
D.
Neutrons and protons
E.
Shells and neutrons
Answer: D
36.
The fusion of the male and female gametes is known as:
A.
copulation
B.
evolution
C.
fertilization
D.
ovulation
E.
reproduction
Answer: C
37.
Which of the following substances is a salt?
A.
H2SO4
B.
NaOH
C.
HCl
D.
CaCl2
Answer: D
38.
An omnivore is an animal that feeds on
A.
raw food.
B.
fresh foods.
C.
cooked foods.
D.
all kinds of food.
Answer: D
39.
The greatest danger faced by mammals living on land is
A.
becoming too cold.
B.
becoming too hot.
C.
losing water through evaporation.
D.
gaining too much water through absorption.
Answer: C
40.
When the testa of a soaked bean is removed, the seed is seen to be made up of mainly
A.
micropyles
B.
hilum
C.
radicle
D.
embryo
E.
cotyledons
Answer: E
THEORY QUESTIONS
1.
(a)
(i)
State the difference between an opaque object and a translucent object
(ii)
Give one example each of an opaque and a translucent material.
(b)
(i)
What is the importance of seed dispersal?
(ii)
Name two types of fruits and state their mode of dispersal.
(c)
(i)
What is recycling?
(ii)
Give two advantages of recycling of materials.
(iii)
List three recycled products in Ghana.
(a)
(i)
Differences between an opaque object and a translucent object
| Opaque object | Translucent object |
| Does not allow light to pass through it | Allows some amount of the incident light to pass through it but one cannot see through it |
| Reflects or absorbs all the incident light without transmitting any | Partly absorbs and reflects some of the incident light and transmits the rest |
(ii)
Examples of opaque objects
1. Mirror
2. Wood
3. Metal
4. Wall
5. Human body
Examples of translucent objects
1. Frosted glass
2. Cloth
3. Water
4. Patchment
5. Oil
6. Kerosene spot on paper
7. Lamp shade/cloth/paper
(b)
(i)
Importance of seed dispersal
1. It prevents overcrowding of plants/prevents competition among plants for food and sunlight
2. It introduces/spreads plants to new areas
3. It minimizes the spreading of diseases among plants
(ii)
Types of fruits and their mode of dispersal
| Fruit | Mode of dispersal |
| Mango | Man/animal |
| Silk cotton | Wind |
| Coconut | Water |
| Flamboyant/beans/okro/legume | Man/animal |
| Crotalaria/pride of Barbados | Explosive/self |
(c)
(i)
Recycling is the production of new products from used/waste materials
OR
Recycling is the conversion of waste materials into useful products.
(ii)
Advantages of recycling of materials
1. It reduces waste in the environment/helps to control pollution
2. It conserves resources
3. It helps to generate income/employment
4. It helps in generation/conversion of energy
(iii)
Recycled products in Ghana
1. Polythene bags
2. Slippers
3. Paper
4. Tissue paper
5. Particle boards
6. Cooking pots
7. Iron rods
8. Rubbers
9. Biogas
2.
(a)
In an experiment, an iron bar is magnetized by dragging a magnet over the surface of the bar from end A to end B several times as shown in the diagram below.
(i)
Mention the method of magnetization.
(ii)
Give the polarity of the ends A and B of the bar after the magnetization.
(iii)
How will you test that the bar AB is a magnet?
(iv)
Indicate how you will test for the poles of A and B of the bar.
(v)
Give one precaution that should be taken during the magnetization process.
(vi)
Name one other method of magnetization.
(b)
The set-up below is used to prepare gases in the laboratory.
(i)
Give the names of the parts labelled I, II, III and IV.
(ii)
Write down the two names of the method of gas collection.
(iii)
Explain how the gas collects over the water.
(iv)
Name two gases that can be prepared using the set-up.
(c)
The set-up below shows air being breathed out through the mouth into test-tube containing lime water.
(i)
Why does the lime water turn milky?
(ii)
Identify the milky substance produced.
(iii)
Write a balanced chemical equation for the reaction.
(iv)
Name two other substances present in breathed-out air.
(v)
What is the aim of the experiment?
(a)
(i)
Single stroke/single touch
(ii)
A → South pole
B → North pole
(iii)
How to test that the bar AB is a magnet
1. The bar suspended horizontally at its midpoint will be in the North-South direction when at rest
2. Suspend AB freely at its midpoint. One pole of a known magnet brought at a time to the ends A and B will show both attraction and repulsion for both ends
3. The bar AB is brought close to a plotting compass. The compass shows deflection
4. Dip the ends A and B of the bar into iron filings. Iron filings will cling to the poles/magnetic substances are attracted by both ends of the bar
(iv)
How to test for the poles of A and B of the bar
1. South pole of a magnet is brought towards end A of the bar and there is repulsion between them
2. A north pole of a magnet is brought towards end B of the bar and there is repulsion between them
(v)
Precautions that should be taken during the magnetization process
1. The magnet should be drawn along the bar AB in only one direction
2. The magnet should be lifted way off the bar AB at the end of each stroke
(vi)
Other methods of magnetization
1. Divided touch/double touch/double stroke
2. Electrical method/electromagnetisation
3. Induction
4. Hammering
(b)
(i)
I → Thistle funnel
II → Delivery tube
III → Flat-bottom flask
IV → Gas jar
(ii)
1. Upward delivery
2. Downward displacement (of water)
(iii)
The gas exerts pressure on the water and pushes it down
(iv)
1. Hydrogen
2. Oxygen
3. Carbon dioxide/Carbon (IV) oxide
(c)
(i)
Lime water turns milky due to the presence of carbon dioxide in the expired air.
(ii)
Calcium carbonate/CaCo3/Calcium trioxocarbonate (IV)
(iii)
Ca(OH)2 + CO2 → CaCo3 + H2O
(iv)
Other substances present in breathed-out air
1. Water vapour/water
2. Nitrogen
3. Rare gases
4. Oxygen (unused)
(v)
To show that carbon dioxide is a by-product of respiration
OR
To show that carbon dioxide is present in expired air/breathed out
3.
(a)
(i)
What is hardness of water?
(ii)
Give one example each of a natural source of water that is:
(α)
hard water;
(β)
soft water;
(b)
What is the end-product of the digestion of each of the following?
(i)
Meat;
(ii)
Cassava;
(iii)
Palm-oil;
(c)
Give one effect of each of the following factors considered in vegetable crop production:
(i)
soil type;
(ii)
nearness to market;
(iii)
nearness to source of water;
(d)
(i)
Explain briefly why an eclipse occurs.
(ii)
Name the two types of eclipse
(a)
(i)
Is the case with which water can lather with soap or the amount of dissolved Ca/Mg/Fe(II) ion in water.
(ii)
Natural sources of hard and soft water
(α)
Hard water
1. Sea water
2. Occean
3. Lagoon water
4. Well water
5. Ground water
6. Canal water
(β)
Soft water
1. River
2. Pond
3. Rain
4. Snow
5. Dew
6. Lake
(b)
End-product of the digestion
(i)
Meat (Protein) = Amino acids
(ii)
Cassava (Carbohydrate) = Glucose
(iii)
Palm-oil (Fat & Oil) = Faty acids/glycerol
(c)
Effect of factors considered in vegetable crop production
(i)
Soil type
1. Helps the farmer to know what type of vegetable to grow
2. To enhance yield of crops
3. To ensure adequate retention of water
4. To ensure adequate growth of crops
(ii)
Nearness to market
1. To avoid rotting of crop through long distance travels
2. For easy sale of vegetable crops
3. For easy purchase of farm inputs
(iii)
Nearness to source
1. For easy irrigation (supply of water to the crops)
2. To dilute pesticides for spraying
3. To process crops through washing
4. To apply fertilizer in solution to crops
(d)
(i)
Why an eclipse occurs
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.
Thus eclipse occurs when light from the sun is blocked by an opaque object to produce a shadow
(ii)
Types of eclipse
1. Solar or eclipse of the sun
2. Lunar or eclipse of the moon
4.
(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
5.
a)
State three functions of the female reproductive system in humans
b)
i)
What is the role of a capacitor in a circuit.
ii)
Give two examples of a compound machine
c)
i)
What is Integrated Pest Management?
ii)
State two advantages of practicing integrated pest management.
d)
i)
State two classes of mixtures.
ii)
Classify each of the following substances under the classes stated in (i)
(α) bronze;
(β) when perfume is sprayed into the air.
a)
Functions of the female reproductive system in humans
1. Produces female sex cells/eggs/ova
2. Produces the female hormones
3. Houses the embryo
4. Site for fertilization of eggs
5. Site for implantation of fertilized eggs/zygote
b)
i)
Roles of capacity in a circuit
1. Used to maintain a power supply when the device is unplunged and without a battery for a short time
2. Store electric energy/charges when they are connected to a charging circuit
3. To smooth current fluctuation for signal/control circuit
ii)
Examples of a compound/complex machine
1. Sewing machine
2. Mower
3. Tractor
4. Car
5. Mist blower
c)
i)
Integrated Pest Management
It involves the combination of all known methods of pest control to check pests
OR
Is a combination of biological chemical, cultural and physical methods to combat pests
ii)
Advantages of Integrated Pest Management
1. Less toxic residues in crops or food
2. Less expensive or easier or faster
3. More effective or destroy pests easier or faster
4. Less harmful to the environment
d)
i)
Classes of mixtures (I)
Homogenous and heterogenous
Classes of mixtures (II)
Solution, suspension and colloid
Classes of mixtures (III)
Solid - Solid, Solid - Liquid, Liquid - Liquid and Liquid - Gas
ii)
α) Bronze → Homogenous or Solution or Solid - Solid
β) Perfume sprayed into the air → Heterogenous or Suspension or Liquid - Gas
6.
(a)
(i)
Explain the term friction
(ii)
Give two methods of reducing friction
(iii)
A rigid bar is used to lift a stone
α)
Draw a diagram showing the effort, pivot and load positions
β)
If the length of the bar is 100 cm and the pivot is placed 80 cm from the effort, calculate the load distance
(b)
(i)
Explain the term excretion
(ii)
State the organs in human beings which excrete the following waste products:
α)
Sweat
β)
Carbon dioxide
γ)
Urine
(c)
(i)
What is a food chain?
(ii)
Draw a food chain using the following organisms:
Hawk, cassava leaf, lizard and grasshopper
(d)
State three conditions necessary for the germination of seed.
(e)
(i)
Name two diseases which can be transmitted sexually
(ii)
Give two features which can be passed on from parents to children
(a)
(i)
Friction is the force that opposes the relative (sliding) motion between two surfaces in contact with one another.
(ii)
Methods of reducing friction
1. Lubrication
2. Using ball bearings
3. Greasing
4. Polishing the surfaces to make them smooth
(iii)
α)
β)
Effort distance + Load distance = Length of bar
Length of bar = 100 cm
Effort distance = 80 cm
80 cm + Load distance = 100 cm
Load distance = 100 cm - 80 cm
Load distance = 20 cm
(b)
(i)
Excretion is the process of removing metabolic waste/substances from the body of a living organism.
(ii)
| # | Waste substances | Organs |
| α) | Sweat | Skin |
| β) | Carbon dioxide | Lungs |
| γ) | Urine | Kidneys |
(c)
(i)
A food chain is the linear sequence of feeding relationship that shows the transfer of energy from one organism to another through feeding and being fed on by another.
(ii)
Cassava leaf → grasshopper → lizard → hawk
(d)
Conditions necessary for the germination of seed
1. Nature of seed coat
2. Water/moisture
3. Air/Oxygen
4. Suitable/optimum temperature/warmth
5. Viability of the seed
6. Enzymes
7. Sunlight/light
8. Dormancy period
(e)
(i)
Diseases which can be transmitted sexually
1. Gonorrhea
2. AIDS (Acquired Immune Deficiency Syndrome)
3. Syphilis
(ii)
Features which can be passed on from parents to children
1. Weight
2. Intelligence
3. Colour of the skin
4. Ability to roll the tongue
5. Temperature
6. Height/stature of an individual
7. Colour of eyes
8. Colour of hair
9. Blood group
10. Shape of face/nose/head/eye
11. Haemophilia
12. Albinism
13. Sex