KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Which of the following is a rhizome?
A.
Potato
B.
Ginger
C.
Onion
D.
Cocoyam
E.
Cassava
Answer: B
2.
Which of the following heavenly bodies is a star?
A.
Jupitar
B.
Moon
C.
Sun
D.
Venus
Answer: C
3.
The eclipse of the moon occurs when the
A.
moon and the sun are in a straight line
B.
earth and the sun are in a straight line
C.
sun is between the earth and the moon
D.
earth is between the sun and the moon
E.
moon comes between the sun and the earth
Answer: D
4.
The law of conservation of energy states that energy can
A.
be created but not transformed
B.
be destroyed but not transformed
C.
neither be created nor transformed
D.
not be created but can be transformed
E.
neither be created nor destroyed, but only be transformed
Answer: E
5.
The efficiency of a machine is always less than 100% because part of the energy input is used to
A.
stop the machine after working.
B.
perform useful work of the load.
C.
overcome friction.
D.
lift the machine up.
Answer: C
6.
A student who complained of stomach upset was given first aid with Mg(OH)2 boldly written on it. What could be the common name of the first aid the student was given?
A.
Milk of aluminium
B.
Milk of magnesia
C.
Trisilicate
D.
Martins liver salt
Answer: B
7.
The largest component of sweat is
A.
glucose
B.
oil
C.
salt
D.
urea
E.
water
Answer: E
8.
The farm animal which has crop as part of its digestive system is the
A.
fowl.
B.
goat.
C.
pig.
D.
sheep.
Answer: A
9.
Which of the following chemical equations is balanced?
A.
N2+H2→NH3
B.
N2+3H2→NH3
C.
N2+H2→2NH3
D.
N2+3H2→2NH3
Answer: D
10.
Which of the following energy sources is/are environmentally friendly?
I. Wind
II. Hydro
III. Biomass
A.
I only
B.
II only
C.
I and II only
D.
I, II and III
Answer: D
11.
The force which pulls all objects towards the centre of the earth is the
A.
frictional force.
B.
electrostatic force.
C.
gravitational force.
D.
rotational force.
Answer: C
12.
The fusion of an egg cell with sperm forms
A.
an ovum.
B.
an embryo.
C.
a zygote.
D.
an ovary.
E.
a placenta.
Answer: C
13.
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
14.
Hydrogen is represented by the chemical symbol H2. This symbol represents
A.
two molecules of hydrogen.
B.
two atoms of hydrogen.
C.
two elements of hydrogen.
D.
two ions of hydrogen.
Answer: B
15.
Which of the following practices is not a principle of crop rotation?
A.
Legumes should be added to the rotation programme.
B.
Deep rooted crops should be followed by shallow rooted crops.
C.
Crops that are closely related should follow each other.
D.
Fallow period should be allowed during the time of rotation.
Answer: C
16.
Which of the following form part of the alimentary canal?
I. Colon
II. Gullet
III. Liver
IV. Pancreas
A.
I and II only
B.
I and IV only
C.
II and III only
D.
II and IV only
E.
I, II and III only
Answer: A
17.
Disposal of sewage into a river which supplies water for domestic use may lead to an outbreak of
A.
malaria
B.
cholera
C.
guinea worm
D.
river blindness
E.
tuberculosis
Answer: B
18.
The first step in the digestion of fats in the body is that
A.
bile breaks down the fat in the gall bladder.
B.
bile breaks down the fat in the duodenum.
C.
lipase breaks down the fat in the pancreas.
D.
lipase breaks down the fat in the ileum.
Answer: B
19.
The central nervous system is made up of the
A.
brain and nerves.
B.
brain and spinal cord.
C.
veins and nerves.
D.
skull and spine.
Answer: B
20.
Which of the following food items produces amino acids as end-product of digestion?
A.
Cabbage
B.
Fish
C.
Margarine
D.
Rice
Answer: B
21.
Combination of science, technology and innovation is needed in Ghana because it
A.
equips students to travel abroad and work.
B.
makes students develop interest in science, technology and innovation.
C.
makes students understand their environment better.
D.
promotes national development.
Answer: D
22.
The combining power of an element is called
A.
ion
B.
electron
C.
atom
D.
valency
E.
proton
Answer: D
23.
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
24.
Photosynthesis in plants requires chlorophyll, sunlight, water and
A.
oxygen
B.
carbon dioxide
C.
steam
D.
hydrogen
E.
nitrogen
Answer: B
25.
A stick which is partially immersed in water appeared to be bent due to
A.
absorption.
B.
reflection.
C.
refraction.
D.
transmission.
Answer: C
26.
Which of the following statements about the properties of water are correct? It
I. is colourless and tasteless
II. is neutral to litmus paper
III. turns red litmus paper blue
IV. is a universal solvent
A.
I and II only
B.
I and III only
C.
I, II and IV only
D.
I, III and IV only
Answer: C
27.
What is the name of the final product of protein digestion?
A.
Glucose
B.
Fatty acid
C.
Amino acid
D.
Glycerol
E.
Sucrose
Answer: C
28.
Which of the following type of teeth is used by mammals to tear food material?
A.
Canines
B.
Incisors
C.
Molars
D.
Premolars
Answer: A
29.
Fertilisation in humans usually occurs in the
A.
ovary.
B.
uterus.
C.
vagina.
D.
fallopian tube.
Answer: D
30.
The part of air which supports burning is
A.
nitrogen
B.
inert gas
C.
water vapour
D.
oxygen
E.
carbon dioxide
Answer: D
31.
There are thick forests in part of the world where the climate is
A.
Hot and wet
B.
cool and wet
C.
hot and dry
D.
cool and dry
E.
warm and dry
Answer: B
32.
The method of preserving food by drying is similar to salting because in both cases germs are
A.
deprived of the air needed for growth.
B.
deprived of the water needed for growth.
C.
destroyed at high temperatures.
D.
destroyed at low temperatures.
Answer: B
33.
Which of the following practices encourages soil erosion?
A.
Planting cover crops
B.
Mulching
C.
Contour ridging
D.
Crop rotation
E.
Ploughing along the slope
Answer: E
34.
Which of the following substances is capable of neutralizing an acid?
A.
Vinegar
B.
Water
C.
Sodium chloride
D.
Sodium hydroxide
Answer: D
35.
The sun and the planets form the
A.
atmosphere.
B.
constellation.
C.
milky way.
D.
solar system.
E.
universe.
Answer: D
36.
The function of the lungs is to
A.
maintain a constant amount of water in the body.
B.
absorb oxygen from the blood.
C.
absorb carbon dioxide from the blood.
D.
maintain the temperature of the body constant.
Answer: C
How the lungs work
Every cell in your body needs oxygen to live. The air we breathe contains oxygen and other gases. The respiratory system's main job is to move fresh air into your body while removing waste gases.
Once in the lungs, oxygen is moved into the bloodstream and carried through your body. At each cell in your body, oxygen is exchanged for a waste gas called carbon dioxide. Your bloodstream then carries this waste gas back to the lungs where it is removed from the bloodstream and then exhaled. Your lungs and respiratory system automatically perform this vital process, called gas exchange.
37.
In which of the following structures in a living cell is cellulose found?
A.
Chloroplast.
B.
Mitochondrion.
C.
Cell membrane.
D.
Cell wall.
Answer: D
38.
The food nutrient which ensures good health in farm animals is
A.
carbohydrates.
B.
minerals.
C.
proteins.
D.
vitamins.
Answer: D
39.
Which of the following statements about the state of matter is correct?
A.
Molecules in a solid are disorderly arranged.
B.
Solids are highly compressible.
C.
Liquids have definite form and volume.
D.
Molecules in a gas move faster than those in a liquid.
Answer: D
40.
The instrument used to measure current in an electric circuit is the
A.
ammeter.
B.
anemometer.
C.
barometer.
D.
thermometer.
E.
voltmeter
Answer: A
Ammeter: Current
Anemometer: Wind speed
Barometer: Atmospheric pressure
Thermometer: Temperature
Voltmeter: Voltage/Potential Difference
THEORY QUESTIONS
1.
(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
2.
(a)
(i)
What is indiscriminate sex?
(ii)
Give two reasons why teenagers indulge in indiscriminate sex.
(b)
Name two sources each of
(i)
natural light;
(ii)
artificial light.
(c)
State three ways in which soil texture is important in crop production.
(d)
Write down the systematic name of each of the following chemical compounds:
(i)
FeS;
(ii)
CO;
(iii)
Cu2O;
(iv)
NaOH.
(a)
(i)
Indiscriminate sex is the act of having sexual intercourse with any person or having many/multiple/different sexual partners.
(ii)
Reasons why teenagers indulge in indiscriminate sex
1. Peer pressure
2. Lack of parental guidance
3. Poor financial status of parents/poor homes
4. Lack of sex education
5. Weak morals/exposure to pornographic material
(b)
(i)
Sources of natural light
1. Sun
2. Fireflies
3. Stars
4. Lightening
5. Glow worm
6. Volcano
Note: the moon is not a source of natural light
(ii)
Sources of artificial light
1. Heated filament/electric bulb
2. Firecrackers
3. Torchlight/flashlight
4. Buring charcoal
5. Lantern
6. Satellite
7. Wood fire
8. Lamp
(c)
Ways in which soil texture is important in crop production
1. It helps the farmer to know the type of farming method to use
2. It has an effect on water and air relationship
3. It influences the soil temperature
4. It influences the water holding capacities of the soil
5. Knowledge of soil texture is important in determining soil management practices to adopt
6. It helps the farmer to know the type of crop to plant
(d)
Systematic name of chemical compounds:
(i)
FeS → Iron (II) sulphide
(ii)
CO → Carbon (II) oxide
(iii)
Cu2O → Copper (I) oxide
(iv)
NaOH → Sodium hydroxide
3.
a)
i)
What is digestion?
ii)
Describe briefly how food is digested in the stomach.
b)
i)
What is meant by eclipse of the sun?
ii)
With the aid of a labelled diagram, distinguish between total eclipse and partial eclipse.
c)
i)
State the difference between a physical change and a chemical change.
ii)
Give one example of each of a physical change and a chemical change.
a)
i)
Digestion is the breaking down of complex or insoluble food substances into simple and absorbable forms in the body of mammals.
ii)
How food is digested in the stomach
1. Slightly alkaline food enters the stomach
2. The walls of the stomach produce/secrete gastric juice which is mixed with the food
3. The gastric juice contains dilute hydrochloric acid and protein digesting enzymes (proteases)
4. The dilute hydrochloric acid provides/creates acidic medium/condition in the stomach
5. The enzymes break down the large protein molecules into simpler units (amino acids)
6. Only protein molecules are digested in the stomach
b)
i)
Eclipse of the sun is the blocking of the light from the sun by the moon from reaching portions/parts of the earth.
OR
Eclipse of the sun occurs when the moon comes between the sun and the earth so that the moon's shadow is cast on the earth.
ii)
Total and partial eclipse
The shadow which the moon casts over the earth has both umbra (total darkness) and penumbra (partial darkness).
People in the direct region of the eclipse observe total darkness/umbra which is the total eclipse.
Those slightly out of the region observe partial darkness/penumbra which is the partial eclipse.
People outside the shadow regions will see the sun as normal.
c)
i)
Differences between a physical change and a chemical change
| Physical Change | Chemical Change |
| No new substance is formed | New substance is formed |
| It is easily reversible | It is irreversible |
| It is not accompanied by great heat change | It is accompanied by great heat change |
| There is no change in mass | There is change in mass |
| Individual components retain their properties | Individual components lose their properties |
ii)
Examples of a physical change
1. Dissolving sugar in water
2. Sand and sugar mixture
3. Sulphur and iron filing mixture
4. Melting of candle
5. Melting of ice
6. Expansion of copper
7. Filtration
8. Freezing of water
9. Grinding of chalk
10. Boiling of an egg for five minutes
11. Chewing of meat in the mouth for two minutes
12. Pounding of boiled cassava and plantain together into fufu
Examples of a chemical change
1. Burning wood
2. Reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl)
3. Rusting of iron
4. Cooking of food
5. Fermentation
6. Chewing of piece of bread in the mouth for two minutes
4.
a)
i)
What is technology?
ii)
State two differences between science and technology.
b)
Draw potassium atom and show the distribution of electrons in its shells.
[K= 19]
c)
What energy transformations take place in each of the following activities?
i)
Using a flashlight battery to produce light in a bulb.
ii)
Using a microphone to address a gathering.
d)
List three components of soil.
a)
i)
Technology is the application of scientific knowledge in a practical way.
OR
Technology is the practical use of scientific discovery/knowledge in industry.
OR
Technology is scientific knowledge which is used to solve problems.
ii)
Differences between Science and Technology
| Science | Technology | |
| 1. | Science is a knowledge-gaining process | Technology is the process of applying knowledge |
| 2. | It requires experimental and logical skills | It requires construction, problem solving, quality assurance, design, testing and decision making |
| 3. | Science produces knowledge that changes gradually over time | Technology produces devices and processes that keep changing rapidly |
b)
c)
i)
Chemical → electical → light
ii)
Sound → electrical → sound
d)
Components of soil
1. Air
2. Water
3. Living organisms/living things
4. Organic matter/humus/decayed plants and animals
5. Inorganic matter
6. Mineral particles/salts/soil particles
5.
(a)
(i)
Name two elements which make the teeth of mammals strong.
(ii)
Name two common diseases of the human teeth.
(b)
State three reasons why sandy soil cannot support effective plant growth.
(c)
An atom has 13 protons and 14 neutrons:
(i)
draw and label the structure of the atom.
(ii)
State its valency.
(d)
(i)
State three ways in which fluid pressure is applied in everyday activities.
(ii)
State one substance that is an insulator.
(a)
(i)
Elements that make the teeth strong
1. Calcium
2. Flourine
3. Phosphorus
(ii)
Common diseases of the human teeth
1. Dental caries/cavity/tooth decay
2. Gum disease/gingivitis/periodontal disease
3. Cancer
4. Plague
(b)
Reasons why sandy soil cannot support effective plant growth
1. Cannot hold enough water/easy for water to filter out
2. Easily eroded
3. Heats up easily/ dries out easily
4. Poor in nutrient content/less fertile
5. Succeptible to leaching
(c)
(i)
(ii)
Valency = 3 (three)
(d)
(i)
Ways in which fluid pressure is applied in everyday activities
1. Water pumps
2. Car brakes
3. Drinking straw
4. Pumping tyre
5. Syringes
6. Siphon
7. Enema
(ii)
Substances that are an insulators
1.Dry wood
2. Air
3. Rubber
4. Plastic
5. Glass
6. Cloth
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