KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
A child suffering from Kwashiorkor lacks
A.
protein
B.
fats and oils
C.
vitamins
D.
mineral salts
E.
carbohydrates
Answer: A
2.
The method of purification of water containing very little impurities is
A.
boiling
B.
chlorination
C.
distillation
D.
filtration
Answer: C
3.
A substance which cannot be broken down into simpler substances is called
A.
a molecule
B.
a compound
C.
an element
D.
a mixture
E.
an atom
Answer: E
4.
Which of the following statements about molecules is/are correct? Molecules
I. are chemically combined group of atoms
II. are physically combined group of atoms
III. can exist on their own
A.
I only
B.
II only
C.
I and III only
D.
I, II and III
Answer: C
5.
The substances which help in the digestion of food materials are called
A.
enzymes.
B.
hormones.
C.
lymph.
D.
mucus.
E.
plasma.
Answer: A
6.
The instrument used to measure potential difference across a resistor is
A.
ammeter.
B.
barometer.
C.
hydrometer.
D.
voltmeter.
Answer: D
Voltmeter: is used to measure the potential difference between two points in an electrical circuit and its connected in parallel in an electric circuit
7.
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
8.
It is not advisable to use old electrical gadgets because they
A.
are not efficient.
B.
are dangerous.
C.
produce sparks.
D.
waste energy.
Answer: D
Old devices use much more energy than new models
9.
Alum is added to water during treatment to
A.
kill germs.
B.
help suspended particles to settle.
C.
make the water colourless.
D.
give taste to the water.
Answer: B
10.
Which of the following statements about acids are correct?
I. They turn red litmus paper blue.
II. They can be neutralized by bases.
III. Citrus fruits contains acids.
A.
I and II only
B.
II and III only
C.
I and III only
D.
I, II and III
Answer: B
Acids turn blue litmus paper red and not the other way round. Statement I is false.
Remember the acronym when you are confused. BAR. B for blue and A for acid and R for red. BAR acronym simply means for Acids (A), Blue litmus paper turns Red.
11.
Which of the following substances is not a constituent of a balanced diet?
A.
Carbohydrate
B.
Protein
C.
Table salt
D.
Vitamins
Answer: C
12.
Plantain is propagated vegetatively by
A.
corms.
B.
stem cuttings.
C.
suckers.
D.
rhizomes.
E.
tubers.
Answer: C
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.
The type of cloud that gives rain is
A.
cumulus.
B.
cirrus.
C.
nimbus.
D.
stratus.
Answer: D
15.
The chemical formula of an aluminium sulphide is AlyS3.Determine the value of y
A.
1
B.
2
C.
3
D.
4
Answer: B
When writing the chemical formula, the element(s) or compound(s) exchange their valencies.The sulphur has that of the aluminium element's valency (3) and so the value of y will also be the valency for sulphur
The atomic number for sulphur is 16 so on the electronic configuration, sulphur will have 2,8 and 6 on the last shell.
In order for sulphur to attain stability, it has to gain 2 electrons to make it 8 in the last shell, hence the valency of sulphur is 2 and so the value of y will be 2 (the valency of sulphur)
NOTE: The atomic number for aluminium is also 13, hence the electronic configuration will be 2,8 and 3. Aluminium could lose its 3 electrons in order to be stable, hence the valency of aluminium is also 3
Hence the chemical formula for aluminium sulphide is Al2S3
16.
Which of the following is the percentage composition of oxygen in the air?
A.
0.03
B.
1
C.
21
D.
78
E.
98
Answer: C
17.
Which of the following gases helps in rusting?
A.
Carbon dioxide
B.
Hydrogen
C.
Oxygen
D.
Nitrogen
Answer: C
The rusting of iron (Fe) is shown by the chemical equation below:
4Fe + 3O2 + 6H2O → 4Fe(OH)3
18.
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.
19.
Which of the following processes removes carbon from the atmosphere?
A.
Respiration
B.
Burning
C.
Decomposition
D.
Photosynthesis
Answer: D
Respiration
The chemical breakdown of organic food substances such as glucose in the living cells to release energy with or without molecular oxygen.
Burning
Combustion, or burning,is a high-temperature exothermic redox chemical reaction between a fuel (the reductant) and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
Decomposition
The process or effect of simplifying a single chemical entity into two or more fragments.
Photosynthesis
Photosynthesis is the process by which green plants manufacture food (starch/glucose) using carbon dioxide and water in the presence of sunlight and chlorophyll.
20.
Which of the following management practices greatly helps in record keeping?
A.
Culling
B.
Debeaking
C.
Dehorning
D.
Identification
Answer: D
21.
Which of the following energy transformations takes place at a hydroelectric power station?
A.
Potential energy → kinetic energy → electrical energy
B.
Potential energy → sound energy → electrical energy
C.
Kinetic energy → sound energy → electrical energy
D.
Electrical energy → light energy → heat energy
Answer: A
22.
Which of the following is true about matter? It has
A.
Weight and direction
B.
Weight only
C.
Weight and volume
D.
Volume and direction
E.
Volume only
Answer: C
23.
Which of the following parts of the human body are sense organs?
I. Tongue
II. Hair
III. Nose
IV. Skin
A.
I and IV only
B.
II and III only
C.
I, II and III only
D.
I, III and IV only
E.
I, II, III and IV
Answer: D
24.
A substance that could be used in large scale treatment of domestic water is
A.
Nitrogen.
B.
Hydrogen sulphide.
C.
Carbon dioxide.
D.
Chlorine.
Answer: D
25.
Which of the following living organisms is not a reptile?
A.
Lizard
B.
Tortoise
C.
Frog
D.
Snake
E.
Crocodile
Answer: C
26.
The best method for checking erosion on a slope is
A.
cover cropping.
B.
mixed cropping.
C.
contour ploughing.
D.
mulching.
Answer: C
27.
A suitable instrument that could be used to measure the internal diameter of a bamboo flute is
A.
beam balance.
B.
metre fule.
C.
surveyor's tape.
D.
vernier callipers.
Answer: D
28.
Which of the following practices will destroy the breeding grounds of mosquitoes?
A.
Sleeping in mosquito nets
B.
Spraying with insecticides
C.
Using insect repellent
D.
Introducing fish into ponds
E.
Burying all empty cans
Answer: B
29.
The use of resistance breeds of farm animals in controlling diseases is a
A.
biological control method.
B.
chemical control method.
C.
cultural control method.
D.
physical control method.
Answer: A
30.
When mango is falling from a tree, its potential energy is changed to
A.
sound energy.
B.
heat energy.
C.
kinetic energy.
D.
chemical energy.
Answer: C
Kinetic energy is the energy which a body possesses by virtue of being in motion.
31.
The blood vessel that carries oxygenated blood from the lungs to the heart is unknown as
A.
pulmonary artery.
B.
pulmonary vein.
C.
vena cana.
D.
aorta.
Answer: B
32.
A mercury thermometer works on the principle that
A.
solids expand on heating and contract on cooling.
B.
liquids expand on heating and contract on cooling.
C.
gases expand on heating and contract on cooling.
D.
liquids evaporate when heated to a certain temperature.
Answer: B
33.
When bread is chewed for a long time, it tastes sweeter because it
A.
is made from sugar and flour
B.
is digested into simple sugar
C.
mixes with saliva which is alkaline
D.
is broken into smaller pieces
E.
contains yeast which is sweet
Answer: B
34.
Which of the following conditions describes a first class lever?
A.
The load is between the effort and pivot
B.
The pivot is between the effort and the load
C.
The effort is between the pivot and the load
D.
The load arm is equal to the effort arm
Answer: B
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.
35.
Which of the following substances is necessary for the formation of food in plants?
A.
Carbon dioxide
B.
Nitrogen
C.
Oxygen
D.
Starch
E.
Sugar
Answer: A
36.
The chief source of energy in the world today is
A.
coal
B.
crude oil
C.
natural gas
D.
uranium
E.
water
Answer: B
37.
Which of the following substances is acidic?
A.
Wood ash
B.
Salt-petre
C.
Bee strings
D.
Bicarbonate of soda
Answer: C
38.
The part of a living cell which is semi-permeable is
A.
cytoplasm.
B.
nucleus.
C.
protoplasm.
D.
cell membrane.
Answer: D
39.
The part of air which supports burning is
A.
nitrogen
B.
inert gas
C.
water vapour
D.
oxygen
E.
carbon dioxide
Answer: D
40.
An example of a simple lever whose effort is at its centre is
A.
a bottle opener
B.
a pair of scissors
C.
a pair of forceps
D.
the beam balance
E.
wheelbarrow
Answer: C
THEORY QUESTIONS
1.
a)
Classify the following chemical substances basd on their uses under the headings as shown in the table below: Milk of magnesia, alcohol, paracetamol, sodium hydroxide, N.P.K.
| Agricultural | Industry | Medicine |
b)
State one use each of the following instruments used in the study of the weather:
i)
rain gauge;
ii)
hygrometer;
iii)
anemomoter.
c)
i)
Name two types of transistors.
ii)
Draw and label the circuit symbols of the transistors named in (i).
d)
State three reasons why vegetable farming is important.
a)
| Agricultural | Industry | Medicine |
N.P.K |
Sodium hydroxide
|
Milk of magnesia
|
b)
i)
Use of rain gauge
It imeasures the amount of rainfall
ii)
Use of hygrometer
It measures humidity/relative humidity
iii)
Use of anemomoter
It measures wind speed.
c)
i)
Types of transistors
1. NPN transistor
2. PNP transistor
ii)
Circuit symbols of NPN transistor
Circuit symbols of PNP transistor
d)
Reasons why vegetable farming is important
1. It serves as a source of income to farmers
2. It serves as a source of employment to people
3. Their produce contain nutrients(carbohydrates, vitamins and mineral salts) which are needed by the human body for normal growth
4. Some vegetables produced from farming contain medicinal substances that treat or control various diseases
5. Some vegetables contain proteins which are used for repair and replacement of worn out cells/tissues
6. Some vegetables produced from farming contain high amount of cellulose/roughage material that prevent constipation
7. It serves as source of food
2.
(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
3.
a)
What is an electrostatic force?
b)
i)
State the unit of
α)
force
β)
work
ii)
A body of mass 80 kg is lifted vertically through a distance of 5.0 m.
Calculate the work done on the body.
[g = 10 ms-2]
c)
Describe briefly how a mixture of common salt and powdered sulphur could be separated.
d)
State three characteristics each of
i)
an insect pollinated flower
ii)
a wind pollinated flower
a)
An electrostatic force is the force that exists between electric charges that are stationary on charged bodies.
b)
i)
α)
The unit of force is newton (N)
β)
The unit of work is joule/joules(J)
ii)
Work done = Force x Distance
Force = Mass x Acceleration due to gravity (g)
Mass = 80 kg
g = 10 ms-2
Force = 80 kg x 10 ms-2 = 800 N
Distance = 5 m
Work done = 800 N x 5 m = 4000 J
c)
How a mixture of common salt and powdered sulphur could be separated
1. Add water to the mixture and stir to dissolve the salt
2. Filter the resulting mixture
3. Sulphur is left on the filter paper and is dried
4. Heat the salt solution in an evaporating dish to obtain the salt
d)
i)
Characteristics of an insect pollinated flower
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
ii)
Characteristics of a wind pollinated flower
1. Have less brightly coloured petals/petals are dull in colour
2. Petals are small in sizes and not easily seen or absent
3. The flower lacks nectar
4. The flower is not scented
5. Large amount of pollen grains are produced per anther
6. Have feathery/hairy stigma
7. Stigma hangs down to be able to catch pollen grains floating in the air
8. Pollen grains are small, light or dry and smooth
9. Filaments are long and flexible
4.
a)
State one symptoms each of the following infections diseases:
i)
cerebrospinal meningitis;
ii)
chicken pox;
iii)
typhoid.
b)
i)
What is energy?
ii)
Give two reasons why it is necessary to conserve energy.
c)
i)
State two methods of restoring soil resources.
ii)
Explain briefly one of the methods stated in (c)(i).
d)
i)
What is binary compound?
ii)
Write the chemical formula of the compound formed between:
(α) Oxygen and lithium
(β) Magnesium and Chlorine
iii)
Name the compound formed in (ii)(α)
a)
i)
Symptoms of cerebrospinal meningitis
1. (High) fever
2. (Severe) headache
3. Stiff neck or painful neck
4. Vomitting
5. Fatigue or numbness or weakness in the muscle of arm or hand or shoulder
6. Imbalance or coordination problem
ii)
Symptoms of chicken pox
1. Loss of appetite
2. Tiredness
3. (High) fever
4. Headache
5. Rashes on body or itching
6. Malaise
iii)
Symptoms of typhoid
1. Diarrhea or constipation
2. Abnormal pain
3. (Mild) fever
4. Headache
5. Fatigue or weakness
6. Cough
7. Cough
8. Loss of appetite
9. Vomitting
b)
i)
Energy is the capacity or ability to do work
ii)
Reasons to conserve energy
1. For future use
2. Create a healthier planet
3. Produce a higher quality of life
4. Reduce the energy bills
5. Helps sustain the resources
c)
i)
Methods of restoring soil resources
1. Fertilizer application/organic composting
2. Land rotation
3. Afforestation/re-afforestation
4. Mulching
5. Cover cropping / green manuring
6. Crop rotation with legumes
ii)
Land rotation
1. This is a system of farming in which a farmer cultivates a piece of land for sometime and leaves it to clear a new land when the old land becomes less fertile
2. It helps check the spread of diseases
3. Land regains lost nutrients after the fallow period
4. Checks spread of pests
Cover crop or green manuring
1. Crops/plants are grown to cover the soil to maintain soil fertility/moisture or to enrich the soil
2. They increase the soil organic matter
Crop rotation
1. Involves growing different types of crops in one location across a sequence of growing seasons
2. It reduces soil erosion
3. It increases soil fertility
Mulching
1. Its the process of using garden leftovers such as leaves, green chipping and shredded trees to cover any bare soil in the garden
2. It improves the soil texture and slow moisture evaporation
3. It also returns organic material and nutrients to the soil
d)
i)
Binary compound is a compound formed from two different elements
ii)
α) Li2O
β) MgCl2
iii)
Lithium oxide
Note the name of the compound formed in β) is Magnesium chloride
5.
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
6.
(a)
(i)
Name the stages in the life cycle of a mosquito.
(ii)
Name the stage at which feeding does not take place.
(b)
Explain briefly why air is regarded as a mixture.
(c)
(i)
What is a magnetic pole?
(ii)
State two uses of temporary magnets.
(d)
Give four reasons for planting crops in rows.
(a)
(i)
Stages in the life-cycle of a mosquito
1. Egg
2. Larva
3. Pupa
4. Adult
(ii)
Stage at which feeding does not take place
Pupa
(b)
Why air is considered as a mixture
Contains different elements which are physically combined.
Consist of different substances which can be separated by physical means/methods
(c)
(i)
Magnetic pole
Point/area on a magnet where the magnetic force is greatest or where all lines of force appear to enter.
(ii)
Uses of temporary magnets
1. Loudspeaker
2. Electric bell
3. Telephone earpiece
4. Generators/electric motors
(d)
Reasons for planting crops in rows
1. Facilitate easy movement on the farm
2. It improves drainage
3. It's easy to replace ungerminated seeds
4. It keeps plant roots evenly spaced
5. Enable larger plant population per unit of plot
6. Easy to know plant population on the farm
7. Better access to sunlight
8. For easy control of pest
9. For easy control of diseases
10. Allow free movement of air