KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
The organ in the human body which is responsible for the removal of urea is the
A.
heart.
B.
kidney.
C.
lung.
D.
liver.
E.
bladder.
Answer: B
2.
The instrument used to measure atmospheric pressure is called
A.
a thermometer.
B.
a force meter.
C.
a barometer.
D.
an anemometer.
Answer: C
3.
A good thermometer liquid must
A.
be colourless.
B.
boil at 100oC and freeze at 0oC.
C.
cling to the walls of the glass.
D.
expand evenly and regularly.
Answer: D
4.
The part of the flower that develops into a fruit is the
A.
ovary.
B.
ovule.
C.
stamen.
D.
style.
Answer: A
5.
A liquid-liquid mixture can be seperated by
A.
filtration
B.
evaporation
C.
sublimation
D.
distillation
Answer: D
Fractional distillation or distillation is a method for separating a liquid from a mixture of two or more liquids. For example, liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation.
6.
A ray of light is incident at an angle of 30° to the surface of a plane mirror. Calculate the angle of reflection.
A.
30°
B.
60°
C.
90°
D.
120°
E.
180°
Answer: B
Angle of incidence = Angle of reflection
Angle to the surface of a plane mirror + angle of incidence = 90°
30° + angle of incidence = 90°
Angle of incidence = 90° - 30° = 60°
Angle of reflection = 60°
7.
The figure below is a diagram of a fish.
Use it to answer the question below.
The function of the part labelled IV is to enable the fish to
A.
sink in water.
B.
absorb oxygen from the water.
C.
protect itself from attack.
D.
detect smell in water.
Answer: B
8.
Which of the following statements about the solar system is true? The
A.
sun moves round the earth
B.
planets move round the sun
C.
planets move round the moon
D.
sun moves in its orbit
E.
sun moves round the moon
Answer: B
9.
A rheostat is used in an electric circuit in order to
A.
increase electric current only.
B.
decrease electric current only.
C.
keep electric current constant.
D.
increase and decrease electric current.
Answer: D
10.
The colour of a soil profile determines the
A.
depth at which implements are set
B.
drainage ability of the soil
C.
fertility of the soil
D.
type of tool to use
Answer: C
Color is an important physical property of soils that allows us to know some of its most important characteristics, such as mineral composition, age and soil processes, chemical alteration, carbon accumulation, the presence of hurrified organic matter. The soil may be black, red, yellow or coppered colored. From the color of the soil, we get an ideal of the fertility, drainage and other such properties.
11.
Which of the following statements about light is true?
A.
Light is reflected from polished surfaces
B.
Light travels through opaque objects
C.
Light passes through plane mirrors
D.
The angle of incidence is between the normal and the reflected ray
E.
The speed of light is less than that of sound
Answer: A
12.
A mixture of sand and common salt could be separated by
A.
filtration and distillation
B.
dissolution and evaporation
C.
dissolution, sedimentation and evaporation
D.
dissolution, filtration and evaporation
E.
sedimentation and filtration
Answer: D
13.
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
14.
An atom of an element is represented as 1327 X. How many neutrons are in the nucleus of the atom?
A.
13
B.
14
C.
27
D.
40
Answer: B
The superscript represents the mass number which is made up of neutrons and protons
The value of the superscript is 27.
Number of protons + Number of neutrons = 27
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 = 13
Atomic number = Number of electrons
Number of electrons = Number of protons
Number of electrons = 13
Number of protons = 13
Protons + Neutrons = 27
13 + Neutrons = 27
Neutrons = 27 - 13
Neutrons = 14
15.
The gas produced when glucose is oxidized during aerobic respiration is
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Carbon dioxide
Answer: D
16.
In an n-p-n transistor, the n-type collector is connected to the positive terminal of the battery thus making the
A.
base-collector junction reverse biased.
B.
base-collector junction forward biased.
C.
base-emitter junction reverse biased.
D.
base-emitter junction forward biased.
Answer: A
17.
The main reason why food is processed is to make it
A.
taste better.
B.
preservable for a longer period.
C.
possible to eat without cooking.
D.
richer in nutrients.
Answer: B
18.
An organism living on another organism and causing harm to it is referred to as a
A.
host
B.
parasite
C.
producer
D.
consumer
E.
vector
Answer: B
19.
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
20.
Which of the following plants is propagated vegetatively?
A.
apple
B.
coconut
C.
pawpaw
D.
pear
E.
sweet potato
Answer: E
21.
When salt is put into soups, it
A.
five months
B.
six months
C.
seven months
D.
nine months
E.
eleven months
Answer: D
22.
An example of a disease vector is
A.
earthworm
B.
liver fluke
C.
tapeworm
D.
tick
Answer: D
23.
Which of the following environmental factors increases sweating in humans?
A.
Low temperature
B.
Low pressure
C.
High pressure
D.
High temperature
E.
High humidity
Answer: D
24.
The part of a living cell which is semi-permeable is
A.
cytoplasm.
B.
nucleus.
C.
protoplasm.
D.
cell membrane.
Answer: D
25.
The method of purification of water containing very little impurities is
A.
boiling
B.
chlorination
C.
distillation
D.
filtration
Answer: C
26.
Metals are able to conduct electricity because they possess
A.
free electrons.
B.
neutrons.
C.
atoms.
D.
free protons.
Answer: A
An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space.
27.
One advantage of friction is that it
A.
enables cutting tools to be sharpened.
B.
increases the efficiency of machines.
C.
produces a lot of heat in machines.
D.
wears off the sole of shoes.
Answer: A
28.
The female part of a flower is the
A.
calyx.
B.
pistil.
C.
petal.
D.
stamen.
Answer: B
29.
Which of the following gases enable burning to take place?
A.
Oxygen
B.
Carbon dioxide
C.
Hydrogen
D.
Ammonia
E.
Nitrogen
Answer: A
30.
Which of the following statements about mammals is true?
A.
They have hairs
B.
They lay eggs
C.
They have feathers
D.
They have beaks
E.
They are cold blooded
Answer: A
Characteristics of mammals
1. Mammals are warm-blooded animals who give birth to their younger ones.
2. They are the most dominant form of animals found in almost all types of habitats.
3. They have mammary glands that help them produce milk to feed their younger ones
4. Presence of region of the brain known as Neocortex
5. Their skin possesses oil glands (sebaceous glands) and sweat glands (sudoriferous glands).
6. The fur of hair throughout the body which helps animals adapt to their environment.
7. They are heterodont, i.e., possess different types of teeth.
8. Mammals also possess cervical vertebrae.
9. The skull is dicondylic.
10. The trunk is divided into thorax and abdomen.
11. The mammals respire through lungs.
12. Good sense of hearing as mammals are aided with 3 middle ear bones
13. Mammals have a four-chambered heart. The sinus venous and renal portal system are absent.
14. Presence of single-boned lower jaws.
15. The brain is well developed divided into cerebrum, cerebellum and medulla.
16. They possess 12 pairs of cranial nerves.
17. Exhibit one of the most advanced forms of Diaphragms.
18. The mammals can lay eggs also. They are known as viviparous.
31.
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
32.
A machine lifts a load of 100 N through a vertical distance of 2 m in 10s.
What is the work done by the machine?
A.
50 J
B.
100 J
C.
200 J
D.
400 J
Answer: C
Work = Force x Distance
Force = 100 N
Distance = 2 m
Work = 100 x 2 = 200 J
33.
The process by which kerosene rises up the wick in a lantern is
A.
evaporation
B.
conduction
C.
diffusion
D.
capillarity
E.
convection
Answer: D
34.
The chemical formula of iron (II) sulphide is
A.
FeS2.
B.
Fe2S.
C.
FeS.
D.
Fe2S3.
Answer: C
35.
The pressure in fluids
A.
increase with depth.
B.
decrease with depth.
C.
acts upwards at any point.
D.
acts differently in all directions.
Answer: A
36.
Malaria parasites enter the human body through
A.
breathing contaminated air.
B.
drinking contaminated water.
C.
mosquito bites.
D.
tsetse fly bites
Answer: C
37.
The instrument used to measure current in an electric circuit is the
A.
ammeter.
B.
photometer.
C.
thermometer.
D.
voltmeter.
Answer: A
38.
An atoms has 4 protons and 5 neutrons in its nucleus. How many positively charged particles are in the atom?
A.
1
B.
2
C.
3
D.
4
E.
5
Answer: D
Protons are positively charged. Hence since there are 4 protons, the atom has 4 positively charged particles.
39.
An organism that lives on decaying organic matter, contaminates human food, feeds on rotten fruits and transfers germs is most likely a
A.
fungus.
B.
grasshopper.
C.
housefly.
D.
mosquito.
Answer: C
40.
The solvent which is most effective in washing bitumen from the hand is
A.
acid.
B.
alcohol.
C.
kerosene.
D.
water.
Answer: C
THEORY QUESTIONS
1.
a)
i)
Mention four female sexual characteristics of a human being.
ii)
Name two sense organs in mammals
iii)
Give one function of each of the sense organs named
b)
Define each of the following terms:
i)
compound
ii)
mixture
c)
List the particles that make up an atom.
d)
State the energy changes that take place in each of the following processes.
i)
An orange falls from a tree to the ground
ii)
A carpenter hits a nail with a raised hammer.
a)
i)
Female sexual characteristics of a human being
1. Vagina
2. Ovaries
3. Womb/uterus
4. Fallopian tubes
5. Cervix
6. Vulva
7. Breast
ii)
Sense organs in mammals
1. Eyes
2. Ears
3. Nose
4. Tongue
5. Skin
iii)
Function of the sense organs
1. Eyes → for sight
2. Ears → for hearing
3. Nose → for smelling
4. Tongue → for tasting
5. Skin → for feeling and excreting sweat
b)
i)
A compound is the substance formed as a result of the chemical combination of two or more elements.
OR
A compound is a substance which is made up of two or more elements chemically combined.
ii)
A mixture is what is formed when two or more substances are combined physically
OR
A mixture is the substance formed as a result of the physical combination of two or more substances which can be separated by physical means.
c)
The particles that make up an atom
Proton, neutron and electrons
d)
Energy changes
i)
An orange falls from a tree to the ground
Potential energy → Kinetic energy → Sound energy + Heat energy
ii)
A carpenter hits a nail with a raised hammer
Potential energy → Kinetic energy → Sound energy + Heat energy
2.
a)
i)
Differentiate between egestion and digestion in nutrition.
ii)
What is the end-product of digestion?
b)
Give one example of a chemical compound used in:
i)
medicine;
ii)
agriculture;
iii)
industry.
c)
i)
Define the term soil profile.
ii)
State two ways in which soil profile is important in crop production.
d)
i)
State two steps used by scientists in doing their work.
ii)
Give two subjects that may be considered as applied sciences.
a)
i)
Differences between egestion and digestion in nutrition
Egestion is the removal of undigested food/semi-solid or waste/faeces from the anus while digestion is the breaking down of food into smaller building blocks or components that can be absorbed into the blood stream.
ii)
End-products of digestion
1. Glucose/simple sugar
2. Amino acids
3. Fatty acids and glycerol
4. Final results obtained after breakdown of complex food substances
b)
Examples of chemical compound used in:
i)
Medicine
Drugs or other pharmaceutical products
Examples: Paracetamol, alcohol, milk of magnesia, aspirin, etc.
ii)
Agriculture
1. Insecticides
2. Pesticides
3. Fertilizers
iii)
Industry
1. Hydrochloric acid
2. Sodium chloride
3. Ammonia
4. Ethanol
5. Nitric acid
6. Sulphuric acid
7. Sodium Hydroxide
c)
i)
Soil profile is the vertical section of the land showing the various horizons or layers and their composition.
ii)
Importance of soil profile in crop production
1. Helps to know the type of tools to choose
2. Helps to select good soil for the crop
3. Helpts to determine depth at which tillage implements must be set
4. Helps to know soil management practices to adopt
5. Helps to determine the type of fertilizer to use or apply
6. Helps to determine the type of crop to grow
7. Helps to know the water holding capacity of the soil
8. Helps to determine fertility of soil
d)
i)
Steps used by scientists to do work
1. Identifying problem
2. Observing
3. Hypothesis
4. Collection of data
5. Experimenting
6. Analyzing data
7. Drawing conclusion
ii)
Subjects considered as applied science
1. Engineering
2. Medicine
3. Agriculture
4. I.C.T
5. Pharmacy
6. Electronics
3.
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.
4.
(a)
Define the following terms and give an example each
(i)
Herbivore
(ii)
Carnivore
(iii)
Omnivore
(b)
Two dry cells connected in parallel are in turn connected in series with a bulb and switch.
Draw a circuit diagram to illustrate this arrangement.
(c)
List four garden tools
(d)
What property of water causes mosquito larvae to float on it?
(e)
Describe an experiment you prepared to show that some part of air is used in burning.
(a)
(i)
Herbivore is an animal that feeds on plants only
Examples: Goat, rabbit, sheep, deer, cow, elephant, giraffe, horse
(ii)
Carnivore is an animal that feeds on the flesh of other animals only
Examples: Lion, wolf, leopard, hyena, polar bear, cat, cheetah, giant panda, felidae, tiger, sharks, venus fly trap
(iii)
Omnivore is an animal that feeds on both plants and animals
Examples: Man, bears, birds, dog, raccoons, fox, certain insects
(b)
(c)
List of garden tools
1. Cutlass
2. Hoe
3. Rake
4. Axe
5. A pair of secateurs
6. Garden fork/digging fork/foot fork
7. Spade
8. Hand trowel
9. Hand fork
10. Watering can
11. Garden shears
(d)
Surface tension
(e)
An experiment to show that some part of air is used in burning
1. Two candles are lighted simultaneously
2. Glass jar is mounted on one of the candles
3. It is observed that after a while, the candle under the inverted glass jar went off because it was no longer supplied with air whiles the other candle without the inverted glass jar kept on burning
4. It can be concluded that some part of air is used in burning
5.
(a)
How would you demonstrate that expired air contains carbon dioxide?
(b)
(i)
What is an ion
(ii)
Give two examples of ions
(c)
(i)
What is capillary action
(ii)
State two processes which use capillary action
(d)
(i)
What is a lever?
(ii)
Give two examples of second class levers
(e)
(i)
Use any three of the following organisms to construct a food chain.
Rat, hawk, okro leaves, toad, cassava, man, grasshopper
(ii)
List three ways of keeping the teeth healthy.
(a)
How to demonstrate that expired air contains carbon dioxide
1. Breath out into lime water in a test tube fitted with a delivery tube
2. The colourless lime water turns milky/chalky indicating the presence of carbon dioxide
(b)
(i)
An ion is an electrically charged atom
OR
An ion is an atom or group of attoms which have lost or gain electron(s).
(ii)
Examples of ions
1. Potassium ion (K+)
2. Sodium ion (Na+)
3. Chlorine ion (Cl-)
4. Magnesium ion (Mg2+)
5. Hydroxide ion (OH-)
6. Sulphate ion (SO42-)
7. Aluminum ion (Al3+)
8. Calcium ion (Ca2+)
8. Copper (I) ion (Cu+)
9. Copper (II) ion (Cu2+)
10. Hydrogen ion (H+)
11. Iron (II) ion (Fe2+)
12. Iron (III) ion (Fe3+)
13. Lead (II) ion (Pb2+)
14. Lithium ion (Li+)
15. Silver ion (Ag+)
16. Tin (II) ion (Sn2+)
17. Zinc ion (Zn2+)
18. Bromide ion (Br-)
19. Fluoride ion (F-)
20. Iodide ion (I-)
21. Nitride ion (N3-)
22. Oxide ion (O2-)
23. Sulfide ion (S2-)
24. Ammonium ion (NH4+)
25. Carbonate ion (CO32-)
(c)
(i)
Capillary action is the rise or fall of liquids in small/narrow tubes/columns as a result of adhesion and surface tension forces.
(ii)
Processes which use capillary action
1. Kerosene moving up the wick in a lamp
2. Water moving from the soil into roots of plants
3. Blotting of ink with blotting paper
4. A sponge absorbing water
5. Placing a straw into a glass of water
(d)
(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)
Examples of second class levers
1. Wheel barrow
2. Nut cracker
3. Bread knife
4. Bottle opener
5. Paper cutter
6. Staplers
7. Doors or gates
8. Nail clippers
(e)
(i)
Okro leaves → grasshopper → toad
OR
Okro leaves → grasshopper → man
OR
Cassava → rat → hawk
OR
Cassava → rat → man
(ii)
Ways of keeping the teeth healthy
1. Brushing of teeth/chewing stick/removal of food particles in between teeth
2. Avoid taking too much sweets
3. Avoid eating too hot or cold food
4. Visit the dentist regularly
5. Chew roughage to exercise teeth
6. Do not misuse teeth for example using it to open bottle tops
7. Avoid using sharp objects to remove particles in-between teeth
8. Take in food containing calcium/vitamins/phosphorous
6.
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