KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
One disease that affects the nervous system of humans is
A.
filariasis.
B.
measles.
C.
poliomyelitis.
D.
typhoid
Answer: C
Poliomyelitis (Polio) is a highly infectious disease caused by a virus. It invades the nervous system and can cause total paralysis in a matter of hours.
2.
A free movement of the bowels is aided by
A.
sleeping at least 6 hours a day.
B.
washing one's body at least twice a day.
C.
eating fatty foods.
D.
eating foods containing fibre.
Answer: D
3.
The chemical symbol for potassium is
A.
Fe
B.
K
C.
P
D.
Pb
E.
Zn
Answer: B
4.
Addition of more solvent to a solution makes the solution more
A.
dense.
B.
dilute.
C.
concentrated.
D.
saturated.
E.
super saturated.
Answer: B
5.
Which of the following characteristics is/are of the image formed in a pinhole camera? The image is
I. inverted.
II. virtual.
III. diminished.
A.
I only
B.
II and III only
C.
I and III only
D.
I, II and III
Answer: C
Characteristics of image formed in a pinhole camera
(i) The image formed is real because it is visible on the screen
(ii) It is inverted
(iii) It is generally smaller/diminished than the size of the object
6.
Which of the following methods of preserving food makes use of heat energy from the sun?
A.
Drying
B.
Frying
C.
Salting
D.
Refrigeration
Answer: A
7.
Iodine deficiency in humans could result in a disorder known as
A.
diabetes.
B.
goitre.
C.
kwashiorkor.
D.
scurvy.
Answer: B
8.
The solid component found on the filter paper and the liquid component that flows into a container during filtration are respectively called
A.
filtrate and residue.
B.
condensate and residue.
C.
residue and filtrate.
D.
residue and condensate
Answer: C
The solid that remains on the filter paper is called the residue, and the liquid that passes through the filter paper is called the filtrate
9.
Photosynthesis occurs only in green plants because they
A.
absorb water
B.
are found in the tropics
C.
are very active
D.
contain chlorophyll
E.
take in carbon dioxide
Answer: D
10.
Which of the following substances is a compound?
A.
Oxygen
B.
Magnesium
C.
Water
D.
Sodium
Answer: C
A compound consists of two or more different elements chemically combined in a fixed ratio. Oxygen, magnesium and sodium are all elements but water is a compound made up of hydrogen and oxygen (H2O)
11.
Water that requires more soap in order to form lather is described as
A.
clean.
B.
hard.
C.
pure.
D.
soft.
Answer: B
12.
The fish is protected from injury by the
A.
fins.
B.
gills.
C.
operculum.
D.
scales.
Answer: D
13.
The part of the plant which is found in the soil is the
A.
flower
B.
stem
C.
leaf
D.
root
E.
fruit
Answer: D
14.
When the north poles of two magnets are brought together they
A.
attract each other.
B.
repel each other.
C.
first attract and then repel each other.
D.
have no effect on each other.
Answer: B
When two north poles are approached together, the magnetic field lines repel each other and the two magnets experience a repulsive force. The same occurs if two south poles are approached together.
Like poles repel each other
15.
One disease which can be transmitted through eating half cooked meat is
A.
guinea worm.
B.
hook worm
C.
thread worm.
D.
tape worm.
Answer: D
16.
Which of the following is the sense organ for sight?
A.
Skin
B.
nose
C.
eye
D.
ear
E.
tongue
Answer: C
17.
Which of the following soils is likely to be found in a waterlogged area?
A.
Sand
B.
Clay
C.
Gravel
D.
Black soil
E.
loam
Answer: B
18.
The proper way of maintaining soil structure and fertility is termed as soil
A.
conservation
B.
depletion
C.
profile
D.
erosion
Answer: A
19.
A natural phenomenon that illustrates the dispersal of light is
A.
a rainbow.
B.
an eclipse.
C.
a rainfall.
D.
an echo.
Answer: A
20.
The testis in mammals produces
A.
blood.
B.
lymph.
C.
sperms.
D.
urine.
Answer: C
21.
Chlorine gas is an example of
A.
an atom.
B.
an element.
C.
a compound.
D.
a molecule.
Answer: D
22.
Which of the following characters is not acquired through heredity?
A.
Language spoken
B.
Shape of nose
C.
Colour of eyes
D.
Temperament
Answer: A
23.
An example of the process of osmosis is
A.
Selective reabsorption
B.
Absorption of digested food
C.
The spread of petrol scent
D.
Gaseous exchange in living things
Answer: A
24.
Which of the following statements about a force are correct? It
I. is measured in newtons.
II. is measured in newton-metre.
III. can start a motion.
IV. can change the direction of a moving body.
A.
I and II only
B.
I and III only
C.
I, III and IV only
D.
I, II, III and IV
Answer: C
25.
The feeling of soil between fingers is used to determine the
A.
texture of the soil.
B.
drainage of the soil.
C.
capillary of the soil.
D.
water holding capacity of the soil.
Answer: A
26.
Which of the following sources of light is natural?
A.
Filament bulb
B.
Fluorescent tube
C.
Glow worm
D.
Fire cracker
Answer: C
27.
Which of the following soil type has the highest capillarity?
A.
Clay
B.
Loam
C.
Sand
D.
Silt
Answer: A
One of the problems with clay soil is its slow permeability resulting in a very large water-holding capacity. Because the soil particles are small and close together, it takes water much longer to move through clay soil than it does with other soil types. Clay particles then absorb this water, expanding as they do so and further slowing the flow of water through the soil. This not only prevents water from penetrating deep into the soil but can also damage plant roots as the soil particles expand.
28.
The name of the smallest blood vessel in humans is
A.
artery.
B.
arteriole.
C.
capillary.
D.
vein.
E.
venule.
Answer: C
29.
Dehusking and shelling are both activities carried out in the processing of
A.
cowpea.
B.
groundnut.
C.
maize.
D.
sorghum.
Answer: C
30.
Which of the following structures regulate the amount of light that enters the eye?
A.
Choroid
B.
Cornea
C.
Iris
D.
Lens
E.
Retina
Answer: C
31.
Which of these methods is used to separate insoluble solids from liquids?
A.
Distillation
B.
Evaporation
C.
Filtration
D.
Winnowing
Answer: C
You simply filter the liquid from the solid.
32.
Which of the following is the cleanest source of drinking water?
A.
Lake
B.
Stagnant water
C.
River
D.
Deep well
E.
Surface well
Answer: D
33.
Which of the following food substances is not oxidized during respiration?
A.
Fatty acids
B.
Amino acids
C.
Glucose
D.
Cellulose
E.
Vitamins
Answer: E
34.
Which of the following effects are caused by rusting?
I. Loss of strength
II. Loss of structure
III. Loss of electrical conductivity
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: D
35.
Which of the following states of matter are fluids
I. Solid
II. Liquid
III. Gas
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: C
A fluid is matter that flows when a force is applied to it. All gases and all liquids are fluids.
36.
Which of the following ways of treating water makes the water soft?
A.
Adding alum
B.
Adding washing soda
C.
Chlorinating
D.
Filtering
Answer: B
37.
A transistor is said to operate in an active region when
A.
one p-n junction is forward biased and the other is reverse biased.
B.
base-emitter junctions are reverse biased.
C.
both p-n junctions are reverse biased.
D.
base-collector junction is forward biased.
Answer: A
38.
Which of the following is characteristic of reflex action?
A.
It happens slowly
B.
It happens consciously
C.
It takes a long path
D.
It involves thinking
E.
It is automatic
Answer: E
39.
Which of the following insect(s) show(s) the egg, nymph and adult stages in its life cycle?
I. Grasshopper
II. Housefly
III. Mosquito
A.
I only
B.
I and II only
C.
II and III only
D.
I, II and III
Answer: A
Grasshopper life cycle
Grasshoppers are hemimetabolous insects. Hence, their life cycle consists of three stages – the egg, the nymph, and the adult.
Housefly life cycle
The life cycle of housefly comprises four stages namely, egg, larva, pupa and adult.
Mosquito life cycle
Life cycle of mosquito consists of four stages namely, egg, larval, pupal, and adult.
40.
Stirring of soil on vegetable beds is to
I. improve aeration of soil.
II. increase activities of soil organisms.
III. increase water penetration in the soil.
IV. reduce weed growth.
A.
I and II only
B.
I, III and IV only
C.
II, III and IV only
D.
I, II and IV only
Answer: B
THEORY QUESTIONS
1.
a)
What is vegetable crop?
b)
i)
What is air pollution?
ii)
State two humans activities that lead to air pollution.
c)
i)
List three modes of heat transfer.
ii)
Name the type of medium in which each mode of heat transfer you have listed in (i) takes place.
d)
Give three reasons why proteins are important in the diet of mammals.
a)
Vegetable crop is any (herbaceous) plant whose parts (seeds/fruits/roots/tubers/bulbs/stems/leaves/flowers) are used as foods.
b)
i)
Air pollution is the release of toxic/poisonous substances into the atmosphere.
ii)
Humans activities that lead to air pollution
1. Discharge of gases from factories
2. Smoke from exhaust engines and other machines
3. Smoke from domestic fires
4. Discharge of chloroflourocarbons from aerosol sprays and some refrigerators
5. Bush burning
6. Dust from open cast mining
7. Dust from sand winning and stone quarrying
8. Dust from construction
9. Smoke from cigarette/smoking
c)
i)
Modes of heat transfer
1. Conduction
2. Convection
3. Radiation
ii)
Medium for mode of heat transfer
1. Conduction → Solid
2. Convection → Liquid/gas/fluid
3. Radiation → vacuum/no material medium
d)
Importance of protein
1. Replacement/repair of worn out tissues/cells
2. Replacement of dead tissues/cells
3. Growth
4. Makes hormones
5. Makes enzymes
6. Provides energy
2.
(a)
State three differences between metals and non-metals in terms of their physical properties.
(b)
(i)
Explain the term active region as applied to transistors;
(ii)
State what happens in the active region of a transistor.
(c)
(i)
State two effects of lack of protein in the diet of humans.
(ii)
Describe briefly the chemical test for glucose.
(d)
(i)
What are soil resources?
(ii)
State two agricultural activities which make the soil lose its nutrients.
(a)
Differences between metals and non-metals
| Metals | Non-metals |
| Good conductor of heat | Poor conductor of heat |
| Conducts electricity | Does not conduct electricity/poor conductor |
| Lustrous | Dull |
| Malleable | Non-malleable |
| Ductile | Brittle |
| High density | Low density |
| High melting point | Low melting point |
| Generally hard | Generally soft |
(b)
(i)
Active Region
The active region is defined as the region in which the emitter-base junction is forward biased and the collector-base junction is reverse biased.
(ii)
In the active region of a transistor, the transistor behaves as an amplifier
(c)
(i)
Effects of lack of protein
1. Leads to kwashiorkor
2. Anaemia
3. Slow healing of wounds
4. Hair and nail problem
5. Greater risk of bone fracture
6. Affects the formation of enzymes/hormones
7. Stunted growth
8. Metabolism slows down
9. Swelling in the legs/feet
10. Loss of muscle mass
(ii)
Chemical test for glucose
1. Add Fehling's/Benedit's solution to the test sample and heat
2. A brick red/reddish brown colouration indicates the presence of glucose
(d)
(i)
Soil resources
Soil resources are materials/components in the soil that support plant growth
(ii)
Agricultural activities that make the soil lose its nutrients
1. Continuous cropping/over cropping
2. Excessive drainage/run off
3. Burning of organic matter/bush burning
4. Irrigation leading to leaching
5. Crop removal
6. Over grazing
7. Poor tillage practices
8. Excessive use of chemical fertilizers
3.
(a)
(i)
What is meant by a satellite?
(ii)
State one difference between a natural and an artificial satellite.
(iii)
State two uses of artificial satellite.
(b)
Give two differences between the mass and weight of a body.
(c)
Write the chemical formulae for the following substances.
(i)
Calcium oxide;
(ii)
Water;
(iii)
Copper sulphate.
(d)
What will be the effect on the colour of blue litmus paper when it is dropped in each of the following solutions?
(i)
Sodium hydroxide solution;
(ii)
Dilute hydrochloric acid;
(iii)
Lime juice;
(iv)
Water.
(e)
(i)
Define breathing
(ii)
Arrange the following parts of the human being respiratory system in order in which air from the atmosphere passes through them during breathing:
Trachea, nostrils, lungs and bronchus.
(iii)
Describe briefly what happens to a piece of bread when it reaches the duodenum of a human being.
(a)
(i)
A satellite is an object which moves around a planet in space
(ii)
Differences between a natural and an artificial satellite
| Natural satellite | Artificial satellite |
| Has no engine | Uses rockets/engines |
| Not projected by man | Launched into space by man |
| It is permanent | It is temporary |
| Created by God before our forefathers | Man made |
| Its orbit is fixed | Its orbit can be varied |
(iii)
Uses of 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
(b)
Differences between the mass and weight of a body
| Mass | Weight |
| Mass is measured in kilogrammes (Kg) | Weight is measured in newtons (N) |
| Mass is not a force | Weight is a force |
| Mass is a scalar quantity | Weight is a vector quantity |
| Mass is constant everywhere | Weight varies from place to place |
(c)
(i)
Calcium oxide → CaO
(ii)
Water → H2O
(iii)
Copper sulphate → CuSO4
(d)
| # | Solution + Blue litmus paper | Observation |
| i) | Sodium hydroxide solution | No colour change on litmus paper/colour of litmus paper remains the same because sodium hydroxide is a base |
| ii) | Dilute hydrochloric acid | The colour of the litmus paper changes from blue to red because hydrochloric acid is an acid |
| iii) | Lime juice | The colour of the litmus paper changes from blue to red because lime juice is an acid |
| iv) | Water | No colour change on litmus paper/colour of litmus paper remains the same because water is neutral |
(e)
(i)
Breathing is the process by which animals take in oxygen and give out carbon dioxide through their lungs/respiratory organs.
(ii)
The human being respiratory system in order in which air from the atmosphere passes through them during breathing
Nostrils → Trachea → Bronchus → Lungs
(iii)
Digestion of a piece of bread when it reaches the duodenum of a human being
1. When the bread gets into the duodenum, the pancreas produces a liquid called pancreatic juice
2. The pancreatic juice contains an enzyme called amylase which breaks down the bread (carbohydrate) into complex sugar (maltose)
4.
(a)
Explain the term mixed cropping.
(b)
(i)
What is an alloy?
(ii)
Name the constituent elements in brass.
(c)
(i)
State three effects of dumping waste materials into water bodies.
(ii)
State one function of each of the following factors in photosynthesis:
(α)
chlorophyll;
(β)
water.
(d)
(i)
What is work?
(ii)
A block of wood of mass 10 kg was dragged through a distance of 3.2 m when a force of 20 N was applied. Calculate the work done.
(a)
Mixed cropping
A system of farming in which two or more crops are grown on the same piece of land at the same time/simultaneously
(b)
(i)
Alloy
An alloy is a uniform mixture of two or more metals or a metal and non-metal.
(ii)
Brass contains Copper and Zinc
(c)
(i)
Effects of dumping waste materials into water bodies
1. Decompose to give the water bad odour
2. Introduces germs/diseases into the water
3. Reduces oxygen level in the water
4. Causes flooding
5. Makes water dirty/unsafe for drinking/pollutes water
(ii)
(α)
Function of chlorophyll in photosynthesis
Absorbs/traps sunlight/converts CO2 and H2O into glucose
(β)
Function of water in photosynthesis
Used to produce glucose/produces oxygen
(d)
(i)
Work
Work is said to be done when a force moves a body through a distance in the direction of the force
(ii)
Work = Force x Distance
Force = 20 N
Distance = 3.2 m
Work done = 3.2 m x 20 N = 64 J
5.
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)
6.
a)
i)
What is the importance of a fuse in an electrical appliance?
ii)
State two household appliances that have fuse.
b)
i)
What is teenage pregnancy?
ii)
State two causes of teenage pregnancy.
c)
State three precautions against hazards.
d)
i)
State two practices that destroy water bodies.
ii)
Give two methods of conserving water bodies.
a)
i)
Importance of a fuse in an electrical appliance
1. To protect electrical equipment from excessive current
2. It is used as safety measures to prevent any hazards to humans
ii)
Household appliances that have fuse
1. Lamps
2. Televisions
3. Wall socket
4. Computers
5. Kettle
6. Dishwasher
7. Fridges/freezers
8. Electric fan
9. Electric iron/iron
10. Microwave
b)
i)
Teenage pregnancy is when a girl under age 20 conceives/takes seed.
OR
Teenage pregnancy is when female/girls under the age of 20 get pregnant.
OR
Teenage pregnancy is when a female/girl under the age of 20 engages in sexual activity and becomes pregnant either intentionally or unintentionall.
ii)
Causes of teenage pregnancy
1. Poverty
2. Single parenthood
3. Rape
4. Peer pressure, etc.
c)
Precautions against hazards
1. Wearing protective clothing/boots/goggles/gadget
2. Routine maintenance of equipment/apparatus
3. Developing right skills for use of equipment
3. Closing all taps before leaving the laboratory
4. Switching off all electrical points
5. Mounting hazard signs of dos and don'ts in the laboratory/working area
6. Store materials appropriately
7. Carry chemicals in approved containers
8. Always wash hands after using any unsafe material
d)
i)
Practices that destroy waterbodies
1. Deforestation/clearing vegetation along the river banks
2. Bush burning
3. Farming near water bodies
4. Galamsey/surface mining activities
5. Dumping of solid/liquid waste into water bodies
6. Use of chemicals for fishing
7. Excessive use of chemical fertilizers
8. Defecation into water bodies, etc.
ii)
Methods of conserving water bodies
1. Use of organic materials for composting
2. Use of appropriate methods of fishing
3. Education on effects of galamsey activities
4. Education on defecation into water bodies
5. Use of erosion-control methods in farming
6. Afforestation, etc.