KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
The smallest planet known in the solar system is
A.
Earth
B.
Jupiter
C.
Mars
D.
Mercury
E.
Venus
Answer: D
2.
One advantage of soft water over hard water is that soft water
A.
Has a pleasant taste
B.
Can prevent heart diseases
C.
Does not waste soap
D.
Forms scales in kettle
Answer: C
3.
The human male sex cell that takes part in reproduction is the
A.
penis
B.
scrotum
C.
sperm
D.
testis
Answer: C
4.
An atom that has lost one or more electron(s) is called
A.
a molecule.
B.
a proton.
C.
am ion.
D.
a negative particle.
Answer: C
5.
The volume of a metal ball was determined by dropping it into a measuring cylinder containing 20 cm3 of water and the water level rose to 35 cm3. If the mass of the ball is 35 g, calculate its density.
A.
1.0 g cm-3
B.
1.6 g cm-3
C.
1.8 g cm-3
D.
2.3 g cm-3
Answer: D
Density =
Volume = Final Volume - Initial Volume
Volume = 35 cm3 - 20 cm3
Volume = 15 cm3
Mass = 35 g
Density =
Density = 2.33 g cm-3
6.
The amount of light that enters the eye is reduced by the size of the
A.
lens.
B.
iris.
C.
pupil.
D.
retina.
Answer: B
7.
Which of the following takes the shape of its container?
A.
Chalk
B.
Charcoal
C.
Paper
D.
Petrol
E.
Stone
Answer: D
8.
A hunter experiences a backward force upon firing a gun. Which of the Newton's laws of motion is demonstrated in the situation?
A.
First law
B.
Second law
C.
Third law
D.
Law of inertia
Answer: C
Newton's third law states that for every action (force) in nature there is an equal and opposite reaction. If object A exerts a force on object B, object B also exerts an equal and opposite force on object A.
When a bullet is fired from a gun, the gun exerts a force on the bullet in the forward direction. This is the action force. The bullet also exerts an equal force on the gun in the backward direction. This is the reaction force.
9.
A rod appears bent when immersed in water. What property of light is demonstrated?
A.
Refraction
B.
Reflection
C.
Dispersion
D.
Rectilinear propagation
Answer: A
10.
The mineral salts in dead organisms become available to the soil through
A.
Decomposition
B.
Diffusion
C.
Fermentation
D.
Leaching
E.
Manuring
Answer: A
11.
The figure below is a diagram of a fish.
Use it to answer the question below.
The part labelled V is used for
A.
balancing.
B.
steering.
C.
surfacing.
D.
paddling.
Answer: B
12.
Water that forms lather readily with soap is said to be
A.
clean.
B.
hard.
C.
soapy.
D.
soft.
Answer: D
13.
Starch is digested and absorbed into the blood as
A.
soluble starch
B.
water
C.
glucose
D.
fat
E.
sucrose
Answer: C
14.
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.
15.
Which of the following sources of light is natural?
A.
Filament bulb
B.
Fluorescent tube
C.
Glow worm
D.
Fire cracker
Answer: C
16.
A fertilised ovum is known as
A.
a gamete
B.
a zygote
C.
oocyte
D.
an ovary
E.
a foetus
Answer: B
17.
The change in the volume of water when a piece of stone is dropped into it is equal to the
A.
density of the stone.
B.
mass of the stone.
C.
volume of the stone.
D.
weight of the stone.
Answer: C
18.
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
19.
Which of these is not a sense organ?
A.
Eye
B.
Ear
C.
Nose
D.
Skin
E.
Heart
Answer: E
20.
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.
21.
Spectacles with converging lenses are used by people suffering from
A.
cataract.
B.
glaucoma.
C.
headache.
D.
long-sightedness.
E.
short-sightedness.
Answer: D
22.
Which of the following waste disposal practices is best for plastic disposal?
A.
Burning
B.
Composting
C.
Incineration
D.
Recycling
Answer: D
23.
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.
24.
Which of the following substances is a compound?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Sulphur
E.
Water
Answer: E
Compounds are made up of two or more different elements. All the options except water are elements/atoms.
The chemical formula of water is H2O which is made up of hydrogen and oxygen atoms (Two different elements).
25.
The function of the platelets in the circulatory system of humans is to
A.
Transport oxygen
B.
Transport carbon dioxide
C.
Clot of blood
D.
Defend the blood
Answer: C
26.
The best way of protecting oneself from high blood pressure is to
A.
consume alcoholic drinks.
B.
eat high carbohydrate diet.
C.
engage in smoking.
D.
exercise regularly.
Answer: D
27.
Which of the following organs are connected by the ureter?
A.
Liver and kidney
B.
Kidney and bladder
C.
Bladder and heart
D.
Intestines and anus
E.
Lungs and bladder
Answer: B
28.
The following soil qualities are important for crop production except
A.
high salinity.
B.
nutrient availability.
C.
oxygen availability.
D.
water-holding capacity.
Answer: A
29.
In plants when the male gamete fuses with the egg, the first structure that is formed is the
A.
embryo.
B.
testa.
C.
fruit.
D.
seed.
E.
zygote.
Answer: E
30.
The mole is the S.I unit of
A.
amount of substance.
B.
luminous intensity.
C.
temperature.
D.
mass of substance.
Answer: A
31.
Which of the following crops is not correctly matched with its group?
A.
Cowpea - cereal crop
B.
Cocoa - beverage crop
C.
Coconut - oil crop
D.
Cocoyam - tuber crop
Answer: A
32.
If a mixture of water and powdered charcoal is allowed to stand for a long time, the charcoal
A.
raises to the top.
B.
settles at the bottom.
C.
dissolves completely in the water.
D.
continues to remain suspended in the water.
Answer: B
33.
A mirror is used to direct sunlight onto the wall of a classroom by
A.
dispersion.
B.
refraction.
C.
reflection.
D.
radiation.
Answer: C
When a ray of light approaches a smooth polished surface and the light ray bounces back, it is called the reflection of light. The incident light ray that land on the surface is reflected off the surface. The ray that bounces back is called the reflected ray.
34.
Soup which is not well-heated gets spoilt when kept for sometime because the
A.
salt in the soup is too small.
B.
water in the soup do not all evaporate.
C.
heat in the soup is not enough to kill all bacteria.
D.
water condenses back into the soup.
Answer: C
35.
Mineral salts in dead organisms are released into the soil by a process called
A.
decomposition.
B.
diffusion.
C.
leaching.
D.
osmosis.
Answer: A
36.
Which of the following changes does not occur in a girl at the age of puberty?
A.
The breasts develop
B.
The hips widen
C.
Menstruation
D.
The teeth becomes whiter
E.
Hair grows in the pubic area
Answer: D
37.
An example of a third class lever is
A.
wheelbarrow.
B.
sugar tongs.
C.
pair of scissors.
D.
crowbar.
Answer: B
38.
An atom of carbon is represented as 612 C. How many neutrons are in the nucleus of the carbon atom?
A.
2
B.
4
C.
6
D.
12
Answer: C
The superscript represents the mass number which is made up of neutrons and protons
The value of the superscript is 12.
Number of protons + Number of neutrons = 12
The subscript represents the atomic number which is the number of electrons in a neutral atom. In a neutral atom, the number of electrons is equal to the number of protons.
Atomic number = 6
Atomic number = Number of electrons
Number of electrons = Number of protons
Number of electrons = 6
Number of protons = 6
Protons + Neutrons = 12
6 + Neutrons = 12
Neutrons = 12 - 6
Neutrons = 6
39.
The three states of matter are
A.
Water, liquid and gas
B.
Earth, liquid and gas
C.
Solid, liquid and air
D.
Gas, earth and water
E.
Gas, liquid and solid
Answer: E
40.
The S.I unit for density is
A.
ms-1
B.
ms-2
C.
kg m-3
D.
m3kg-1
Answer: C
THEORY QUESTIONS
1.
a)
i)
What is a transistor?
ii)
Give two uses of a transistor.
b)
Mention the suitable solvent for each of the following solutes:
i)
grease;
ii)
ink stain;
iii)
starch;
iv)
cube sugar;
v)
oil paint;
vi)
iodine.
c)
i)
What is a respiratory organ?
ii)
Name two structures of the respiratory system of humans.
d)
i)
What is agricultural chain?
ii)
Name two types of agricultural chain.
a)
i)
A transistor is a three terminal (a base, emitter and collector) semiconductor device.
ii)
Uses of a transistor
1. Used as an amplifier
2. Used as a switch
3. Used as a rectifier
4. Used for tuning in radios
5. Used as a voltage/current regulator
b)
i)
Suitable solvents for grease
1. Petrol
2. Kerosene
3. Methylated spirit
ii)
Suitable solvents for ink stain
1. Milk
2. Alcohol
3. Parazone
4. Shaving cream
5. Kerosene
iii)
Suitable solvents for starch
1. Alcohol
2. Acetone
iv)
Suitable solvents for cube sugar
Water
v)
Suitable solvents for oil paint
1. Turpentine
2. Kerosene
3. Petrol
4. Thinner
vi)
Suitable solvents for iodine
1. Ethanol/Alcohol
2. Potassium iodide solution
c)
i)
Respiratory organ is an organ used by living organisms for gaseous exchange
ii)
Structures of the respiratory system of humans
1. Trachea
2. Lungs
3. Alveolus
4. Larynx
5. Diaphragm
6. Bronchus/Bronchi
7. Nostril/Nose
8. Nasal cavity
9. Intercostals muscle
10. Ribs
11. Pharynx
d)
i)
Agricultural chain is a series of stages that are connected in the production of agricultural goods/services.
ii)
Types of agricultural chain
1. Production
2. Processing
3. Supply
4. Value
2.
(a)
Explain why a tomato plant is likely to wilt if too much fertilizer is applied to it.
(b)
(i)
Give two differences between electrical insulators and electrical conductors.
(ii)
State two effects of illegal electrical connections in the home.
(c)
Explain each of the following terms as used to describe change of state of matter:
(i)
condensation;
(ii)
freezing.
(d)
(i)
State two diseases of the circulatory system in humans.
(ii)
Mention two ways in which each of the diseases you have stated in (d)(i) can be prevented.
(a)
Why a tomato plant is likely to wilt if too much fertilizer is applied to it
Once two solutions of different concentrations come into contact, water molecules will flow from low to higher concentrated solution. Hence application of fertilizer makes the soil solution of higher concentration so water flow out of the plant by osmosis. The tomato plant plasmolyses/loses water and wilt.
Note
Plasmolysis describes a process involving a plant cell losing water content and therefore contracting and shrinking its cytoplasm and plasma membrane away from the inside of its cell wall. This occurs if the solution surrounding a plant cell is hypertonic or has a high concentration of solutes like salt.
(b)
(i)
Differences between electrical insulators and electrical conductors
| Electrical insulators | Electrical conductors |
| Does not conduct electricity | Conducts electricity |
| Has narrow conduction energy band | Has wide conduction energy band |
| There exists a wide forbidden energy gap between valence and conduction band | Has no forbidden energy gap |
| Electrons firmly bound to nucleus | Electrons loosely bound to nucleus |
| There are no free electrons | Has more free electrons |
(ii)
Effects of illegal electrical connections in the home
1. Overload of power supply
2. Drop in voltage of electricity
3. Leads to frequent power cuts
4. Leads to electrocution/electric shock
5. May cause fire outbreak
6. May damage electrical appliances
7. Leads to loss of revenue to government
(c)
(i)
Condensation is the change from the gas state to the liquid state.
(ii)
Freezing is the change from the liquid state to the solid state.
(d)
| Disease of the circulatory system | Prevention |
| High blood pressure (Hypertension) |
1. Regular exercise
|
| Low blood pressure (Hypotension) |
1. Regular exercise
|
| Piles/Haemorrhoids |
1. Eat a lot of fruits/vegetables
|
| Leukaemia/Blood cancer |
1. Avoid smoking
|
| Varicose vein |
1. Regular exercise
|
| Arteriosclerosis |
1. Regular physical exercise
|
3.
a)
i)
Distinguish between a rhizome and a stem tuber.
ii)
Give one example each of a rhizome and a stem tuber.
b)
State the method which could be use to separate each of the following mixtures and explain your answer in each case:
i)
salt and water;
ii)
sawdust and iron filings;
ii)
powdered charcoal and water.
c)
i)
Define density of a substance.
ii)
Explain how a body which sinks in water could be made to float.
a)
i)
Differences between a rhizome and a stem tuber
| Rhizome | Stem Tuber |
| Creeps horizontally below soil surface | Usually sits/vertically below soil surface |
| Scaly leaves around buds | No scaly leaves around buds |
| Has internodes and nodes | Has only nodes |
| Has both lateral and terminal buds | Has only terminal buds |
ii)
Examples of a rhizome and a stem tuber
Rhizome: Ginger, Canna Lily, Fern, Elephant grass, Tiger nuts
Stem tuber: Yam, Irish potato/potato
b)
| # | Mixture | Method of separation | Explanation |
| i) | Salt and water |
Evaporation OR Crystallization OR Distillation |
Water evaporates OR Salt crystallizes out of the saturated solution OR Water distils off |
| ii) | Sawdust and iron filings | Use of magnet | Iron filings are attracted by a magnet |
| iii) | Powdered charcoal and water |
Filtration OR Decantation |
Charcoal particles are larger than water molecules/cannot pass through filter paper OR Charcoal settles after a long time and water is carefully poured off and charcoal dried |
c)
i)
Density is defined as mass per unit volume of a substance
OR
Density =
ii)
How to make a body which sinks in water float
1. Make the body hollow/shape body into a bowl
2. Decrease the density of the body to lower than the density of water by increasing the volume of the body
4.
a)
i)
What is technology?
ii)
State one use of technology in communication.
b)
Write and balance each of the following chemical equations:
i)
Fe + O2 → Fe2O3;
ii)
Na + Cl2 → NaCl;
iii)
H2 + O2 → H2O.
c)
State one funtion of each of the following components of a typical cell:
i)
nucleus;
ii)
chloroplast;
iii)
mitochondrion.
d)
Mention four cultural practices in vegetable crop production.
e)
Name two agencies in food safety and quality assurance in Ghana.
a)
i)
Technology is the use of the environment to improve lives to meet the needs of society.
OR
Technology is the systematic application of scientific ideas/knowledge/discovery to improve lives to meet the needs of society.
OR
Technology is the application of scientific ideas/knowledge/discovery to produce goods and services.
ii)
Uses of technology in communication
1. Computers
2. Internet
3. Mobile phones/Telephones
4. Fax machine
5. Radio
6. Satellite
7. Television
b)
i)
4Fe + 3O2 → 2Fe2O3
ii)
2Na + Cl2 → 2NaCl
iii)
2H2 + O2 → 2H2O
c)
i)
Functions of nucleus
1. Controls life activities of cells
2. Controls cell reproduction/division
3. Contains heredity units (called genes)
ii)
Functions of chloroplast
1. Contains chlorophyll
2. Absorbs light energy
3. For photosynthesis
iii)
Functions of mitochondrion
For the production of energy/serves as site for respiration
d)
Cultural practices in vegetable crop production
1. Weeding
2. Watering/irrigation
3. Staking
4. Pruning
5. Fertilizer application
6. Mulching
7. Stirring
8. Shading
9. Supplying in
10. Earthing up
11. Pest control
12. Decrusting
13. Disease control
14. Thinning out
15. Pricking out
e)
Agencies in food safety and quality assurance in Ghana
1. Ghana Standard Board
2. Food and Drugs Board
5.
(a)
Name three deficiency diseases associated with diet and state their causes.
(b)
(i)
What is hard water?
(ii)
Mention three ways by which hard water can be made soft.
(c)
(i)
Explain how sound is produced.
(ii)
State one example each of the following instruments:
(α)
wind instrument
(β)
string instrument
(a)
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 |
(b)
(i)
Hard water is water that does not form lather easily with soap.
OR
Hard water is water that contains Ca ions (Ca2+) and Mg ions (Mg2+)
(ii)
Ways by which hard water can be made soft
1. Addition of washing soda/sodium carbonate (Na2CO3)
2. Boiling
3. Distillation
4. Deionization/use of ion exchange resin
(c)
(i)
Sound is produced when a vibrating object/matter sets a mass/particles of air into vibration.
(ii)
(α)
Examples of wind instrument
1. Organ
2. Flute
3. Trampet
4. Saxophone
5. Whistle
6. Trombone
7. Clarinette
8. Tuba
(β)
Examples of string instrument
1. Guitar
2. Piano
3. Banjo
4. Harp
5. Violin
6. Viola
7. Gogi
8. Ukulele
6.
a)
State two precautions that should be taken to prevent the spread of each of the following diseases:
i)
cholera
ii)
smallpox
b)
Describe how you would test for starch in a leaf.
c)
i)
Explain why an inclined plane is classified as a machine.
ii)
Give two reasons why the output energy of a machine is always less than the input energy.
d)
Draw and label the structure of an atom containing three electrons. Indicate the charges of the particles.
a)
i)
Precautions taken to prevent cholera
1. Ensuring refuse/sewage does not contaminate food and water sources
2. Boiling stream/rivers/ground water before drinking
3. Washing hands after visiting the toilet
4. Washing hands/clothing and body after touching cholera patients
5. Keeping environment clean
6. Vaccination
7. Isolating cholera patients
8. Eating hot food
9. Reporting cholera cases to health authorities for action
ii)
Precautions taken to prevent smallpox
1. Living in well ventilated surroundings
2. Avoid spitting in public
3. Wearing neat/clean clothing
4. Avoiding dusty places
5. Vaccination/inoculation
6. Isolating smallpox patients
7. Reporting smallpox cases to health authorities for action
b)
How to test for starch in a leaf
1. Dip the leaf in boiling water for some time
2. Put the boiled leaf in alcohol/methylated spirit
3. Wash in warm water
4. Dip in iodine solution
5. The leaf turns blue black which confirms the presence of starch in the leaf
c)
i)
Why an inclined plane is classified as a machine
1. It enables work to be done easier/faster
2. A heavier load could be overcome with a smaller effort by pushing it up the plane than by lifting it directly upwards
ii)
Reasons why the output energy of a machine is always less than the input energy
1. Part of the input energy is used to overcome friction
2. Part of the input energy is used to overcome inertia
3. Part of the input energy is used to overcome gravitational force
d)
