KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
The force of attraction between molecules of different substances is called
A.
adhesion.
B.
cohesion.
C.
tension.
D.
viscosity.
Answer: A
Difference between adhesive and cohesive force
Cohesive force is the force that attracts molecules of the same substance while Adhesive force is the force that binds molecules of different substances together.
Why water wets glass
Water wets glass and spreads out on it because the adhesive forces between the liquid and the glass are stronger than the cohesive forces within the water.
2.
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
3.
Which of the following appliances transform(s) electrical energy to heat energy?
I. Swish oven
II. Hair drier
III. Refrigerator motor
A.
I only
B.
I and II only
C.
II and III only
D.
I and III only
E.
I, II and III
Answer: C
4.
Which of the following are soil micro-organisms?
A.
Termites
B.
Viruses
C.
Ticks
D.
Bacteria
E.
Crabs
Answer: D
5.
The farming system that makes the most effective use of land is
A.
crop rotation.
B.
land rotation.
C.
mixed cropping.
D.
mixed farming.
Answer: D
6.
The function of the platelets in the circulatory system of humans is to
A.
transport oxygen.
B.
transport carbon dioxide.
C.
defend the body.
D.
cloth the blood.
Answer: D
7.
Which of the following pairs of organs are part of the central nervous system?
A.
Spinal cord and the eyes
B.
Brain and spinal cord
C.
Brain and the ears
D.
Eyes and the ears
E.
Eyes and brain
Answer: B
8.
A mixture of engine oil and water could be best separated by
A.
Evaporation
B.
Freezing
C.
Decantation
D.
Heating
E.
Addition of soap
Answer: C
9.
Which of the following food substances is not involved in respiration?
A.
Amino acids
B.
Fatty acids
C.
Glucose
D.
Vitamins
Answer: D
10.
Which of the following substances can exist in all the three states of matter at 0°C?
A.
Petrol
B.
Palm oil
C.
Milk
D.
Alcohol
E.
Water
Answer: E
11.
On heating a certain solid in a dry container, all the substance was lost without passing through the liquid state. This means the
A.
solid can easily melt
B.
solid is an alloy
C.
solid cannot stand heat
D.
solid particles are held together by weak forces
E.
solid undergoes sublimation
Answer: E
12.
Which of the following processes is an example of osmosis?
A.
Spreading of perfume in a room.
B.
Absorption of food nutrients into the small intestines.
C.
Spreading of potassium permanganate in water.
D.
Absorption of water into the root hairs.
Answer: D
13.
A poultry farmer observed that the layers were producing thin-shelled eggs.
Use this information to answer the question below
What ingredient could be added to the feed to correct the defect?
A.
Maize
B.
Soya bean meal
C.
Cowpea
D.
Oyster shell meal
Answer: D
The defect is mostly caused by deficiency of calcium and can be corrected by feeding the layers with meal containing calcium.
14.
Dehusking and shelling are both activities carried out in the processing of
A.
cowpea.
B.
groundnut.
C.
maize.
D.
sorghum.
Answer: C
15.
Which of the following statements about aerobic respiration is correct?
A.
The by-product are carbon dioxide and water.
B.
Little amount of energy is produced.
C.
Oxygen is not required.
D.
The by-products are alcohol and carbon dioxide.
Answer: A
16.
A man did 75 J of work by lifting a 50 N load from the floor on to a shelf. Calculate the height of the shelf.
A.
0.67 m
B.
1.50 m
C.
25.00 m
D.
125.00 m
Answer: B
Work done = Force x Distance
Divide both sides by Force
Distance =
Distance = = 1.5 m
17.
Heat travels through vacuum by
A.
conduction.
B.
convection.
C.
radiation.
D.
convection and radiation.
Answer: C
Conduction → heat transfer in solid
Convection → heat transfer in fluid
Radiation → heat transfer through vacuum
18.
The term leaching in soils refers to
A.
accumulation of organic matter.
B.
decomposition of plant materials.
C.
fixation of nitrogen.
D.
removal of soil nutrients by water.
Answer: D
19.
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
20.
The best way to prevent guinea worm disease is by
A.
boiling drinking water.
B.
putting camphor in drinking water.
C.
putting drinking water in a refrigerator.
D.
sieving drinking water.
Answer: A
Dracunculiasis is an infection caused by a parasite called the Guinea worm. A person becomes infected when they drink contaminated water.
Usually the disease has no initial symptoms. About one year later, there is a painful burning feeling as a blister forms, usually on the legs. The blister bursts as the worm then comes out of the skin over a few weeks.
The worm can be pulled out a few centimetres each day. The process usually takes weeks.
21.
A smaller heavenly body, which orbits a bigger one could be described as a
A.
comet.
B.
meteor.
C.
moon.
D.
sun.
Answer: C
22.
The diagram below shows a lever system used to move a stone. Use it to answer the question below
Less effort is required to move the stone when the
A.
distance Y is equal to X.
B.
distance Y is greater than X.
C.
distance Y is less than X.
D.
stone is at the pivot.
Answer: B
Mechanical Advantage =
Load Distance: is the distance between the pivot (fulcrum) and the load
Effort Distance: Is the distance between the pivot (fulcrum) and the effort
Since the effort distance (Y) is the numerator in the mechanical advantage formula, the greater it is than the load distance (X), the greater the mechanical advantage and the better the efficiency of the machine/lever.
23.
Typhoid fever is transmitted through
A.
contact with contaminated skin wounds.
B.
eating contaminated food.
C.
eating uncooked food.
D.
drinking treated water.
Answer: B
24.
Which of the following statements best explains animal feed?
A.
Food grown or developed for livestock
B.
Balanced diet provided to animals
C.
Breast milk served to a calf
D.
Grass that is used to feed livestock.
Answer: A
25.
Which of the following substances is a salt?
A.
H2SO4
B.
NaOH
C.
HCl
D.
CaCl2
Answer: D
26.
A mixture of raw starch and water is best separated by
A.
boiling
B.
distillation
C.
decantation
D.
winnowing
E.
crystallization
Answer: C
27.
Which of the following processes is a chemical change?
A.
Digestion of starch by saliva
B.
Melting of wax
C.
Dissolution of sugar in water
D.
Boiling of water
E.
Evaporation of sea water
Answer: A
28.
Which of the following statements best explains the term ecosystem? It is
A.
a group of organisms of the same species that live in the same place at the same time.
B.
a group of populations living in the same area at the same time.
C.
the part of the earth's environment where life exists.
D.
a community of living and non-living things interacting with each other.
Answer: D
29.
Which of the following compounds is neutral to litmus paper?
A.
HCL
B.
H2O
C.
NaOH
D.
KOH
Answer: B
30.
The central nervous system is made up of the
A.
Brain only
B.
Spinal cord only
C.
Brain and sense organs
D.
Brain and spinal cord
E.
Spinal cord and sense organs
Answer: D
31.
When the p-n junction of a transistor is reversed biased
A.
current flows from the p-type to the n-type.
B.
no current flows from the p-type to the n-type.
C.
conduction of current occurs.
D.
current flows from the n-type to the p-type.
Answer: B
32.
During an eclipse of the moon, the
A.
Sun and the moon are on one side of the earth
B.
Earth and the sun are on one side of the moon
C.
Sun comes between earth and moon in a straight line
D.
Earth comes between sun and moon in a straight line
E.
Moon comes between sun and earth in a straight line
Answer: D
33.
Which of the following food items contains the highest amount of dietary fiber?
A.
Beans
B.
Bread
C.
Cabbage
D.
Egg
Answer: C
34.
Which of the following processes is a physical change?
A.
Rusting of iron
B.
Burning of paper
C.
Melting of ice
D.
Fermentation of palm wine
E.
Boiling of an egg
Answer: C
Physical change is reversible and no new substance is formed.
All the options except melting of ice are chemical change because new substances are formed and the process is also not reversible.
For the melting of ice, it can be frozen into ice again so it is reversible and the substance is still water in different forms.
35.
Which type of energy is lost when sweat evaporates from the human body?
A.
Sound energy
B.
Mechanical energy
C.
Chemical energy
D.
Heat energy
Answer: D
36.
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
37.
Landrace is a breed of
A.
cattle.
B.
goats.
C.
pigs.
D.
sheep.
Answer: C
38.
Which of the following life activities are common to both plants and animals?
I. Feeding
II. Locomotion
III. Respiration
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: B
39.
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
40.
In which units are the vast distances between stars in space measured?
A.
Knots
B.
Kilometres
C.
Furlongs
D.
Miles
E.
Light years
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)
(i)
Explain heredity
(ii)
Give two examples of heredity characters.
(b)
Explain whether each of the following processes is a chemical change or a physical change:
(i)
Rusting;
(ii)
Burning;
(iii)
Filtration;
(iv)
Expansion of copper.
(c)
(i)
What is a simple machine?
(ii)
Name two types of simple machines.
(iii)
Explain why the efficiency of a machine cannot be equal to 100%.
(a)
(i)
Heredity is the process in which offsprings acquire characteristics from their parents through the genes they receive from them.
(ii)
Examples of heredity characters
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
(b)
Chemical change and physical change:
(i)
Rusting
Chemical change because a new substance (rust) different from iron is formed.
(ii)
Burning
Chemical change because the ash cannot be turned back easily into the original material.
(iii)
Filtration
Physical change because the components can be gotten easily.
(iv)
Expansion of copper
Physical change because the original shape of the copper can be gotten easily.
(c)
(i)
Simple machine is a device that can be used to make work easier or faster.
OR
Simple machine is a device on which a force/an effort is applied at one point to overcome another force/load at another point.
OR
Simple machine is a device which enables a small force (effort) to overcome a large force (load).
(ii)
Types of simple machines
1. Levers
2. Inclined plane
3. Pulley
4. Wheel and axle
5. Screw
6. Wedge
7. Gears
(iii)
Why the efficiency of a machine cannot be equal to 100%
Part of the work put in the machine to overcome the load is used to overcome friction/weight of machine parts/force of gravity/air resistance so that the work output is always less than the work input.
3.
(a)
For each of the following diseases, name the causative organism and one method of prevention.
(i)
Cholera
(ii)
Bilharzia
(iii)
Malaria
(iv)
Tuberculosis
(b)
Show how you would separate each of the following mixtures:
(i)
Common salt and sand
(ii)
Muddy water
(c)
Explain why the planet and their moons move around the sun but they do not clash.
(d)
Give two uses of the sun's energy in everyday life.
(a)
| Disease | Causative Organism | Prevention |
| Cholera | Vibrio Cholerae |
1. Drinking of pure/boiled water
|
| Bilharzia | Schistosoma |
1. Keeping the surroundings clean
|
| Malaria | Plasmodium |
1. Using mosquito nets
|
| Tuberculosis | Tuberculo Bacillus |
1. Avoiding over crowding
|
(b)
(i)
Separation of common salt and sand
1. Dissolve the common salt by adding water to the mixture in a beaker
2. Stir the mixture
3. Filter the sand from the salt solution using filter paper in a funnel
4. Using a Bunsen burner, heat the salt solution to retrieve the salt in an evaporating dish
(ii)
Separation of muddy water
1. Fold a filter paper into a funnel
2. Pour the muddy water into the funnel and filter
3. The water is then collected by a beaker and sand is left on the filter paper
(c)
Why the planet and their moons move around the sun but they do not clash
The gravitational force of attraction of the sun on the planets and their moons provides the centripetal force that keeps the planets and their moons moving in their respective orbits around the sun without clashing
(d)
Uses of the sun's energy in everyday life
1. It provides energy for photosynthesis in plants
2. It generates energy for solar panels
3. It is a source of light
4. It helps the skin produce vitamin D as it shines on the skin
5. It is used for drying clothes
4.
a)
Name the organism that causes each of the following diseases:
i)
cholera
ii)
malaria
iii)
tuberculosis
iv)
ringworm
b)
State one method of preventing each of the diseases in (a) above.
c)
A ray of light hits the surface of a plane mirror at an angle of 55°.
i)
Draw a ray diagram showing the normal, incident ray and the reflected ray.
ii)
What is the angle of reflection for the ray?
d)
State two properties of the image formed in a plane mirror.
e)
Write the chemical names of each of the following compounds:
i)
MgCl2
ii)
FeS
iii)
NH4OH
iv)
AgCl
a & b)
| Disease | Causative Organism | Prevention |
| Cholera | Vibrio Cholera |
1. Eating hot food
|
| Malaria | Plasmodium |
1. Using mosquito nets
|
| Tuberculosis | Tuberculo Bacillus |
1. Avoiding over crowding
|
| Ringworm | Fungus |
1. Avoid sharing comb and towel
|
c)
i)
ii)
Angle of incidence = Angle of reflection
Angle of incidence = 90° - 55° = 35°
∴ Angle of reflection = 35°
d)
Properties of the image formed in a plane mirror
1. The image formed is laterally inverted
2. The image formed is virtual
3. The image formed is same size as the object
4. The image formed is upright/erect
5. Image distance from the mirror is the same as the object distance
e)
i)
MgCl2 → Magnesium chloride
ii)
FeS → Iron (II) sulphide
iii)
NH4OH → Ammonium hydroxide
iv)
AgCl → Silver chloride
5.
a)
i)
What is an ion?
ii)
State two methods of softening hard water.
b)
i)
Differentiate between pest and parasites as used in a agriculture.
ii)
Give an example each of a:
α)
pest;
β)
parasites.
c)
i)
What is work?
ii)
A force of 10N causes a body to move a distance of 5.2m in the direction of the force. Calculate the work done.
d)
Name two diseases associated with the circulatory system of humans.
a)
i)
An ion is an atom/group of bonded atoms that has lost or gained electron(s) or a charged atom/group of bonded atoms
ii)
Methods of softening hard water
1. Boiling
2. Destillation
3. Addition of washing soda/Na2CO3/Sodium carbonate
4. Use of ion exchange resin/deionization
b)
i)
Difference between pests and parasites
Pest is any organism which causes damage to crops/animals (beneficial to man) while a parasite is a living organism which lives on the surface/inside the body of another organism/host and gets its food from it and in so doing causing harm to the host.
ii)
Examples of pests and parasites
α)
Examples of pests
1. Bed bugs
2. Cockroaches
3. fleas
4. house flies
5. moths
6. Weevils
7. Locusts
8. Beetles
β)
Examples of parasites
1. Protozoa
2. Worms
3. Arthropods (insects)
4. Ticks
5. Aphids
6. Fungi
7. Fleas
8. Dodder
9. Mistletoe
10. Striga
c)
i)
Work is said to be done when a force moves a body through a distance in the direction of the force or is the product of force and distance moved in the direction of the force.
ii)
Work = Force x Distance
Force = 10 N
Distance = 5.2 m
Work done = 10 N x 5.2 m = 52 Joules(J)
d)
Diseases of the circulatory system in humans
1. High blood pressure/hypertension
2. Low blood pressure/hypotension
3. Arteriosclerosis
4. Haemorrhoids/piles
5. Leukaemia
6.
(a)
Draw and label a diagram to show how the eclipse of the sun is formed.
(b)
(i)
What is a lever?
(ii)
Classify the following as first class lever, second class lever or third class lever by copying and completing the table below:
Beam balance, crowbar, wheel barrow, a pair of scissors, claw hammer, sugar tong, human fore-arm and bottle opener
| First class lever | Second class lever | Third class lever |
(c)
(i)
What is pollination?
(ii)
Give two agents of pollination.
(d)
Name three excretory organs and the products they excrete.
(e)
(i)
What is an alloy?
(ii)
What are the compositions of each of the following alloys?
Bronze, Brass, Steel and Duralumin
(f)
Sodium chloride is prepared by the reaction between dilute hydrochloric acid and sodium hydroxide solution. Write down the equation for this reaction.
(a)
(b)
(i)
A lever is a simple machine which consists of a rigid bar/rod free to turn about a fixed turning point called the fulcrum/pivot.
(ii)
| First class lever | Second class lever | Third class lever |
|
Crowbar
|
Wheel barrow
|
Sugar tong
|
(c)
(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)
Agents of pollination
1. Wind
2. Animal (Birds, Bats, Man)
3. Insect
4. Water/Rain
(d)
| Excretory Organs | Excretory Products |
| Skin | Sweat/water and salt/water and urea |
| Kidney | Urine/urea/water and salt |
| Lungs | Carbon dioxide/water vapour |
| Liver | Bile pigments |
(e)
(i)
An alloy is a uniform/homogeneous mixture of a metal and another metal or a non-metal.
(ii)
Compositions of alloys
Bronze → Copper and Tin
Brass → Copper and Zin
Steel → Iron and Carbon
Duralumin → Aluminium, Magnesium, Copper and Manganese
(f)
NaOH + HCl → NaCl + H2O