KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
The process by which water vapour moves through the stomata of leaves into the atmosphere is known as
A.
absorption.
B.
diffusion.
C.
osmosis.
D.
transpiration.
Answer: D
2.
The planet in our solar system which has the largest orbit is
A.
Jupiter.
B.
Mars.
C.
Pluto.
D.
Venus.
Answer: C
3.
Which of the following practices in a community will increase its environmental pollution?
A.
Building of schools with workshops
B.
Planting of trees on large areas of land
C.
Depositing of household rubbish near a source of drinking water
D.
Removal of sand and refuse from choked gutters
E.
building of an efficient underground sewage system
Answer: C
4.
Which of the following devices converts electrical energy into sound energy?
A.
Electric heater
B.
Electric fan
C.
Washing machine
D.
Loudspeaker
Answer: D
5.
The transfer of heat through a solid medium is by
I. conduction
II. convection
III. radiation
A.
I only
B.
II only
C.
III only
D.
I and II only
E.
II and III only
Answer: A
Conduction: Transfer of heat through solid medium
Convection: Transfer of heat through fluids (liquids and gases)
Radiation: Transfer of heat through vacuum
6.
An atom has 6 protons and 7 neutrons in its nucleus. What is the mass number?
A.
1
B.
6
C.
7
D.
13
Answer: D
Mass number = Protons + Neutrons
Mass number = 6 + 7
Mass number = 13
7.
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.
8.
Which of the following sources of energy is non-renewable?
I. Coal
II. Solar
III. Wind
IV. Uranium-236
A.
I, II and III only
B.
II, III and IV only
C.
I and IV only
D.
II and III only
Answer: C
A renewable source can replenish itself at the rate it is used, while a non-renewable source has a limited supply.
Renewable sources include timber, wind, and solar while non-renewable sources include coal and natural gas.
9.
A fuse is used in an electrical circuit to
A.
measure the energy used up.
B.
protect appliances.
C.
provide more current.
D.
make sure current flows continuously.
Answer: B
A fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. It is designed to melt and separate in the event of excessive current thereby stopping or interrupting the current.
10.
Which of the following habits will help in the control of diseases contracted through air?
I. Not throwing human wastes into rivers
II. Washing of hands after visiting the toilet
III. Not spitting about in public places
IV. Keeping foods always covered
A.
I and II only
B.
II and III only
C.
III only
D.
I, II and IV only
Answer: B
11.
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
12.
When testing for proteins in a food substance using Fehling's solution, the expected colour change is
A.
blue.
B.
purple.
C.
blue-black.
D.
brick-red.
Answer: D
13.
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.
14.
Plantain is propagated vegetatively by
A.
corms.
B.
stem cuttings.
C.
suckers.
D.
rhizomes.
E.
tubers.
Answer: C
15.
The relative proportion of sand, silt and clay in a given sample of soil is soil
A.
profile.
B.
porosity.
C.
structure.
D.
texture.
Answer: D
16.
The end product of protein digestion is
A.
amino acid.
B.
glucose.
C.
maltose.
D.
poly-peptide.
E.
sucrose.
Answer: A
17.
The force overcome by a machine is known as the
A.
effort
B.
load
C.
pivot
D.
lever
E.
work
Answer: B
18.
A screw is a machine which works in the same way as
A.
a lever.
B.
an incline plane.
C.
a wheel and axle.
D.
a pulley.
Answer: B
Screw
A screw is an inclined plane that is coiled around a shaft. They usually have one flat end and one pointed end.
19.
Which of the following farming practices is the best way of maintaining soil fertility?
A.
Crop rotation
B.
Seasonal cropping
C.
Constant ploughing
D.
Bush burning
E.
Mono cropping
Answer: A
20.
When a substance is made up of the same kind of atoms it is called
A.
a mixture
B.
a compound
C.
an element
D.
a solution
E.
a solvent
Answer: C
21.
The grouping together of many stars is known as
A.
comet.
B.
astronomy.
C.
solar-system.
D.
galaxy.
Answer: D
22.
All of the following promote Primary Health except
A.
keeping the surroundings clean
B.
effective disposal of waste
C.
personal hygiene
D.
balanced diet
E.
bleaching the skin
Answer: E
23.
A uniform mixture of two or more metals is called
A.
an alloy.
B.
a coiled.
C.
an aerosol.
D.
a compound
Answer: A
24.
Which of the following processes result(s) in the formation of a new substance?
I. Burning of wood
II. Rusting of iron nail
III. Heating water into vapour
A.
I only
B.
I and II only
C.
II and III only
D.
I, II and III
Answer: B
I and II are chemical changes. For chemical change, new substances are formed and the process is not reversible.
25.
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
26.
Which of these is a vegetable crop?
A.
Pineapple
B.
Potato
C.
Cabbage
D.
Cassava
E.
Mango
Answer: C
27.
A fruit in which the pappus has been modified into a parachute structure is dispersed by
A.
explosion
B.
mammals
C.
water
D.
wind
Answer: D
The slightest gust of wind catches the elaborate crown of plumose hairs, raising and propelling the seed into the air like a parachute. The pappus is persistent ant and hence found attached to even small, single seeded fruits. It acts like a parachute that allows the wind carry them to great distances.
28.
When an unknown solution reacted with magnesium, a gas was produced. Which of the following solutions could be the unknown solution
A.
Sodium chloride solution
B.
Sodium hydroxide solution
C.
Hydrochloric acid
D.
Calcium nitrate solution
Answer: C
When Hydrochloric acid react with magnesium a gas is always liberated.
29.
Which of the following flower parts develops into a seed? The
A.
ovule
B.
pollen grain
C.
stamen
D.
stigma
E.
style
Answer: A
30.
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
31.
A substance which is made up of the same kind of atoms is called
A.
a compound.
B.
a mixture.
C.
an element.
D.
an ion.
Answer: C
32.
By the end of digestion, lean meat is turned into
A.
amino acids
B.
fatty acids
C.
glycerol
D.
glucose
E.
sugar
Answer: A
33.
Which of the following types of water would be most contaminated by waste substances?
A.
Rain water
B.
Stream water
C.
Borehole water
D.
Pipe borne water
Answer: B
34.
Plastic materials may be used to make the handles of cooking utensils because they are
A.
Hard
B.
Poor conductors of heat
C.
Attractive
D.
Easy to wash
E.
Not poisonous
Answer: B
35.
Plants do not grow well in gravel because the
A.
air spaces are too big to hold water.
B.
air spaces are too small for the roots.
C.
particles cannot absorb air.
D.
particles cannot contain nutrients.
Answer: D
36.
At which positions S,R,Q and P on the lever in the diagram below must a force be applied to lift the load most easily?
A.
P
B.
Q
C.
R
D.
S
Answer: A
The mechanical advantage of a lever can be calculated as shown below:
The higher the mechanical advantage, the better the machine our work output.
From the formula you will realize that the longer the distance of the effort from the pivot, the higher the mechanical advantage will be since the distance from the load and pivot is fixed (constant).
The distance P will have the highest mechanical advantage, hence that is the best position to apply the force to lift the load.
37.
An aluminium cube with side measuring 2 m has a mass of 24 kg. Calculate the density of the aluminium.
A.
48 kgm-1
B.
24 kgm-1
C.
12 kgm-1
D.
3 kgm-1
Answer: D
Density =
Volume of a cube = Length x Length x Length
Volume of the aluminium = 2 x 2 x 2 = 8 m3
Mass = 24 kg
Density = = 3 kgm-3
38.
Which of the following life processes is not performed by all living things?
A.
Excretion
B.
Photosynthesis
C.
Reproduction
D.
Respiration
Answer: B
39.
The S.I unit for measuring the work done by a force is
A.
J.
B.
K.
C.
N.
D.
W.
Answer: A
40.
A piece of stone could be classified as an opaque material because it
A.
absorbs all the light incident on it.
B.
does not absorb light incident on it.
C.
allows all the light incident on it to pass through it.
D.
does not allow light incident on it to pass through it.
Answer: D
THEORY QUESTIONS
1.
(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
2.
a)
State three differences between molecules in a solid state and liquid state.
b)
i)
What is a solution?
ii)
Differentiate between solutions and mixtures in terms of particle sizes.
c)
Name the elements which make up the following compounds:
i)
water
ii)
common salt
iii)
ammonia
d)
Copy and complete the table below
| Disease | Vector | Causative agent | Symptoms |
| Malaria | |||
| Sleeping sickness |
e)
i)
What is a man-made satellite?
ii)
Give two examples of natural satellites.
iii)
Mention two applications of man-made satellites
a)
Differences between molecules in a solid state and liquid state
| Solid | Liquid |
| Forces of attraction (cohesive force) between molecules are very strong | Forces of attraction (cohesive force) between molecules are weak/less strong |
| Molecules are compacted/closely packed | Molecules are less compacted/loosely packed |
| Molecules occupy fixed positions in a lattice | Molecules move about randomly |
| Molecules vibrate about a mean position | Molecules vibrate about a moving point |
| Molecules have low kinetic energy | Molecules have high kinetic energy |
b)
i)
Solution is a uniform/homogenous mixture of two or more substances.
ii)
Differences between solutions and mixtures in terms of particle sizes
| Solution | Mixture |
| Particles of the solute are far smaller than those of the solvent | Particles of the solute are of comparable size as particles of the solvent |
| Particles are not easily distinguishable/seen | Particles are easily distinguishable/seen |
c)
Compounds and their elements
i)
water → Hydrogen and Oxygen
Note: Water is H2O
ii)
common salt → Sodium and Chlorine
Note: common salt is sodium chloride (NaCl)
iii)
ammonia → Hydrogen and Nitrogen
Note: ammonia is NH3
d)
| Disease | Vector | Causative agent | Symptoms |
| Malaria | Female anopheles mosquito | Plasmodia |
1. Fever
|
| Sleeping sickness | Tsetse fly | Trypanosoma |
1. Sleepiness
|
e)
i)
Man-made satellite or Artificial satellite is a small object put/launched into space by man to orbit (move around) a planet.
ii)
Examples of natural satellites
1. Moon around the earth
2. Earth around the sun
3. Moon around Mars
iii)
Applications/Uses of man-made/Artificial satellites
1. For exploring the planets/moons
2. For scientific research/experimental research/internet
3. To study the universe
4. For communications/broadcasting/telephone call
5. For weather forecast/collecting information on the weather
6. Map making
7. Spying
8. For navigation/satellite for navigation
9. Military purposes
3.
(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
4.
(a)
(i)
What is an echo?
(ii)
State two uses of echoes.
(b)
(i)
State three diseases that affect the respiratory system of human.
(ii)
Name one method each by which the diseases you have named can be prevented.
(c)
(i)
What is biotechnology?
(ii)
List three products that are obtained from biotechnology.
(a)
(i)
Echo is the reflection of sound from a hard surface
OR
Echo is the sound heard which is a reproduction of the original sound made after reflection from a hard surface.
(ii)
Uses of echoes
1. Used to determine the depth of the seabed/river
2. Used by ships to detect barriers/obstacles at night
3. Used by bats to avoid flying into obstacles
4. Used to determine velocity of sound in air
5. Used to determine position/locate shoals of fish in water
6. Used in ultra sound equipment in hospitals for clinical diagnosis
7. Used in exploration of minerals beneath the earth
(b)
(i & ii)
Diseases that affect the respiratory system of human and their preventions
1. Pneumonia
Prevention
1. Covering the chest properly in cold weather
2. Not sleeping in drought conditions such as under a fan, in an open
2. Tuberculosis
Prevention
1. Avoid breathing in dust
2. Avoid smoking
3. Avoiding contact with TB patients
3. Cough
Prevention
1. Avoid eating cold foods
2. Warm food before eating
4. Asthma
Prevention
Avoid pollen dust,fur of animals and other substances that trigger allergic reactions
5. Influenza (flu)
Prevention
1. Avoid contact with infected persons
2. Wash hands frequently
6. Bronchitis
Prevention
Avoid exposure to cold
7. Whooping cough
Prevention
Use vaccine
8. Common cold
Prevention
Avoid inhaling dust particles
9. Lung cancer
Prevention
Avoid smoking
(c)
(i)
Biotechnology is the application of biological processes for the benefit of mankind.
OR
Biotechnology is the use of living organisms/micro organisms to produce useful products.
(ii)
Products that are obtained from biotechnology
1. Antibiotic drugs/streptomycin/penicillin
2. Yoghurt/cheese/butter/bread/corn
3. Bear/wine/pito/palm wine/alcoholic beverages
4. Fermentation products such as drinks, foods and food supplements
5. Biogas
5.
(a)
In an experiment, a pupil took two empty Milo tins and made holes in their sides as shown in the diagram above. The pupil then filled the Milo tins with water.
(i)
Draw and label the diagrams to show what the pupil will observe in set-up A and set-up B.
(ii)
Explain the observations in set-up A and set-up B.
(iii)
What is the aim of set-up A?
(iv)
What is the aim of set-up B?
(b)
In an experiment, equal volumes of dilute hydrochloric acid (Solution A) and dilute sodium hydroxide (Solution B) are mixed together to form solution C.
(i)
What is the volume of solution C?
(ii)
Red litmus paper and blue litmus paper are dipped in turns into solutions A, B and C.
State the observations you will make in all six cases.
(iii)
Give the name of the reaction that took place between solution A and solution B.
(iv)
Identify solution C
(v)
State what will happen when solution C is heated.
(c)
The table below gives the steps that were followed in an experiment to test for starch in a green leaf freshly taken from a tree.
| Stages in the test for starch |
|
I. Leaf is put into boiling water for 1 minute II. Leaf is dipped in alcohol warmed in a hot water bath III. Leaf is washed in cold water IV. Leaf is dipped into iodine solution |
(i)
State the reason for carrying out each of the activities in stages I, II and III.
(ii)
What happens when the leaf is dipped in iodine solution?
(iii)
Give the colour changes of the leaf from the beginning of the experiment to the end of the experiment.
(iv)
Why is the alcohol warmed indirectly in a water bath?
(vi)
Explain what will be observed if the test is carried out on a leaf taken from a plant kept in a dark room for 1 day
(a)
(i)
(ii)
Observations in set-up A
The pressure of the water coming out of the lower hole is higher than the one at the top.
Observations in set-up B
The pressures of the water coming out of the holes are the same because they are at the same level.
(iii)
The aim of set-up A is to show that pressure increases with depth in a liquid.
(iv)
The aim of set-up B is to show that pressure at the same point/level in a liquid is the same.
(b)
(i)
The volume of solution C = Volume of solution A + Volume of solution B
The volume of solution C = 20 cc + 20 cc
The volume of solution C = 40 cc
(ii)
| Solution | Red Litmus | Blue Litmus |
| Solution A | No change in colour/remains red | Turns red |
| Solution B | Turns blue | No change in colour/remains blue |
| Solution C | No change in colour/remains red | No change in colour/remains blue |
(iii)
Neutralization reaction
(iv)
Sodium chloride solution/NaCl solution/salt solution/brine
(v)
The water evaporates leaving solid sodium chloride/NaCl
OR
Solid sodium chloride/NaCl/common salt is formed
OR
Solution becomes concentrated
(c)
(i)
I → to stop further starch formation/stop photosynthesis process/kill the cells
II → to remove the green pigment/to decolourize the leaf/to remove chlorophyll
III → to soften the leaf
(ii)
Leaf turns blue black
(iii)
Green → colourless/white → blue black
(iv)
The alcohol will catch fire when heated over naked fire.
(vi)
No blue black colour will be seen/colour of iodine will be seen because starch is absent.
6.
(a)
(i)
State two reasons which indicate that respiration and burning are similar processes.
(ii)
What is cross-pollination?
(iii)
List four methods by which cholera can be controlled and prevented.
(b)
(i)
Name the three coldest planets.
(ii)
State one reason which accounts for the coldness of the planets you have stated.
(iii)
An object of mass 150 g occupies a volume of 250 cm3. Calculate its density.
(c)
Name a suitable solvent for each of the following substances
(i)
grease
(ii)
oil paint
(iii)
alcohol
(iv)
sugar
(a)
(i)
Reasons which indicate that respiration and burning are similar processes
1. Both processes require oxygen/air to function
2. Both release energy whenever they occur
3. Both are chemical changes/involve the use of energy
(ii)
Cross-pollinationis the transfer of pollen grains from the anther of a flower to the stigma of another flower on another plant of the same species.
(iii)
Methods by which cholera can be controlled and prevented
1. Drinking of pure/boiled water
2. Burying/destroying/covering of excreta/faeces (of cholera patients)
3. Covering of food/keeping food in safes
4. Avoid eating raw vegetables or fruits which have not been washed properly
5. Eating hot foods or avoid eating cold foods
6. Washing hands after attending nature's call
7. Immunization/vaccination
(b)
(i)
Three coldest planets
1. Uranus
2. Neptune
3. Pluto
(ii)
The planets are cold because they are far away from the sun.
(iii)
Density =
Mass = 150 g
Volume = 250 cm3
Density =
Density = 0.6 gcm-3
(c)
(i)
Suitable solvents for grease
1. Kerosene
2. Petrol
(ii)
Suitable solvents for oil paint
1. Kerosene
2. Turpentine
3. Petrol
(iii)
Suitable solvent for alcohol
Water
(iv)
Suitable solvent for sugar
Water