KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
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
2.
Insects can walk on the surface of water because of
A.
diffusion
B.
capillarity
C.
viscosity
D.
friction
E.
surface tension
Answer: E
3.
Use the diagrams below to answer the question below
Which of the following statements is correct about the circuit diagrams above? The cells in diagram
A.
X are in series and the key is open.
B.
X are in parallel and the key is open.
C.
Y are in series and the key is closed.
D.
Y are in parallel and the key is closed.
Answer: A
4.
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
5.
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.
6.
Bronze is an alloy of
A.
iron and carbon.
B.
zinc and copper.
C.
iron and zinc.
D.
copper and tin.
Answer: D
Alloy and their compositions
1. Steel → Iron and Carbon
2. Brass → Copper and Zinc
3. Bronze → Copper and Tin
7.
Heat is transferred along an iron bar by
A.
absorption.
B.
conduction.
C.
convection.
D.
radiation.
Answer: B
8.
Oxygen is made available to all cells of the human body by the
A.
plasma.
B.
platelets.
C.
white blood cells.
D.
red blood cells.
Answer: D
9.
An advantage of soft water over hard water is that soft water
A.
is good for formation of strong bones in humans
B.
prevents heart diseases
C.
has a pleasant smell
D.
saves a lot of soap when used in washing
Answer: D
Water which does not lather readily with soap is called hard water
Hardness of water is caused by the presence of dissolved salts of calcium ion, magnesium ion or iron(III) ion in water
Water which lather readily with soap is called soft water.
Soft water does not contain calcium ion,magnesium ion or iron(III) ion
Advantages of hard water
* Has pleasant taste so used in brewery industry
* Hard water provides calcium, which is essential for bones, teeth, and shells formation in animals
* Hard water provides Ca2+ ions which help in blood clotting in animals
* Hard water provides Ca2+ ions which are used by plants to manufacture certain vital substances
* Reduces heart disease
Disadvantages of hard water
* It wastes soap
* It interferes with dyeing and tanning process.
* It tends to make white clothes grey when they are laundered.
Advantages of soft water
* Lathers well with soap, does not form scum therefore saves soap
* Suitable for dyeing and tanning
* Does not form scale in boilers, kettles, radiators etc.
Disadvantages of soft water
* Has unpleasant taste
* Lack of Ca2+ ions causes weak teeth and bones and does not promote good growth in shellfish, crabs and snails
* Increase the chance of heart disease
10.
Which of the following life processes is represented by the equation below?
Glucose + Oxygen → Water + Carbon dioxide + Energy
A.
Digestion
B.
Excretion
C.
Photosynthesis
D.
Respiration
Answer: D
Respiration Equation
C6H12O6 + 6O2 → 6H2O + 6CO2 + ATP (Energy)
Glucose + Oxygen → Water + Carbon dioxide + Energy
11.
The proper way of maintaining soil structure and fertility is termed as soil
A.
conservation
B.
depletion
C.
profile
D.
erosion
Answer: A
12.
The instrument used to measure relative humidity is
A.
anemometer.
B.
barometer.
C.
hygrometer.
D.
manometer.
Answer: C
Anemometer: Wind speed
Barometer: Atmospheric pressure
Hygrometer: Relative humidity
Manometer: Pressure acting on a column of fluid
13.
The fixed point of a lever at which turning takes place is the
A.
pivot
B.
effort
C.
load
D.
handle
E.
machine
Answer: A
14.
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.
15.
Which of the following pairs of diseases are both contracted through water?
A.
Cholera and dysentery
B.
Smallpox and dysentery
C.
Ringworm and smallpox
D.
Tuberculosis and cholera
E.
Tuberculosis and dysentery
Answer: A
16.
A uniform mixture of two or more metals is called
A.
a solute
B.
a colloid
C.
a compound
D.
a suspension
E.
an alloy
Answer: E
17.
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
18.
The largest component of sweat is
A.
glucose
B.
oil
C.
salt
D.
urea
E.
water
Answer: E
19.
The following products, X,Y,Z and W have masses 0.05 kg, 50 mg, 500 g and 0.05 g respectively.
Use this information to answer the question below.
Which of the products have the same mass?
A.
Y and W
B.
X and Y
C.
Y and Z
D.
X and W
Answer: A
Convert all the masses to the same unit and pick the product with the highest mass.
Let's change all the masses to grams (g)
To change kilogram (kg) to gram, you must multiply by 1000
To change milligram (mg) to gram, you must divide by 1000
Product X mass = 0.05 kg = 0.05 x 1000 g = 50 g
Product Y mass = 50 mg = = 0.05 g
Product Z mass = 500 g
Product W mass = 0.05 g
Product Y and W have the same mass, 0.05 g.
20.
Living things are different from non-living things because living things
A.
are made up of protoplasm
B.
do not have definite forms
C.
take in liquid foods
D.
have chlorophyll
E.
vary widely in form and size
Answer: A
21.
The space occupied by matter is its
A.
area.
B.
mass.
C.
volume.
D.
weight.
Answer: C
22.
Heat travels through a vacuum by a process known as
A.
conduction
B.
convection
C.
radiation
D.
vibration
E.
transmission
Answer: C
23.
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
24.
The food substance found in yam is
A.
carbohydrate.
B.
oil.
C.
protein.
D.
vitamin.
Answer: A
25.
Which of the following flower parts develops into a seed? The
A.
ovule
B.
pollen grain
C.
stamen
D.
stigma
E.
style
Answer: A
26.
The carpel of a flower is made up of the following parts except
A.
filament.
B.
ovary.
C.
style.
D.
stigma.
Answer: A
27.
Spectacles fitted with concave lenses are worn by people suffering from
A.
loss of accommodation.
B.
total blindness.
C.
long sightedness.
D.
short sightedness.
Answer: D
Concave Lenses are for the short sightedness and convex for the long sightedness.
28.
Which of the following elements is a semi-metal?
A.
Carbon
B.
Nitrogen
C.
Silicon
D.
Sodium
Answer: C
29.
A drawing of magnetic line of force provides information on the
A.
source of the field.
B.
type of magnet.
C.
strength of the field.
D.
length of the magnet.
Answer: A
30.
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
31.
Which of the following statements about friction is not true?
A.
It wears off materials
B.
It produces heat
C.
It opposes motion
D.
It increases speed
Answer: D
32.
Regular brushing of teeth is primarily done in order to
A.
keep the mouth fresh
B.
clear away food particles from the teeth
C.
remove bad smell in the mouth
D.
kill bacteria in the mouth
E.
control the flow of saliva
Answer: B
33.
Movements of the ribs is brought about by the
A.
pleural cavity.
B.
intercostal muscle.
C.
larynx.
D.
trachea.
Answer: B
34.
Producers in an ecosystem are plants that
A.
feed on other plants.
B.
feed on dead materials.
C.
manufacture their own food.
D.
attract insects.
Answer: C
35.
Which of the following has a different physical state from the others under ordinary conditions?
A.
Zinc
B.
Lead
C.
Iron
D.
Mercury
E.
Aluminium
Answer: D
36.
Which of the following substances is a mixture?
A.
Sodium chloride
B.
Sulphur dioxide
C.
Sugar solution
D.
Carbon dioxide
E.
Ammonium chloride
Answer: C
37.
Tendrils in plants are adaptations that enable the plant to
A.
climb.
B.
expire.
C.
store food.
D.
reproduce.
E.
propagate vegetatively.
Answer: A
Tendril: a slender threadlike appendage of a climbing plant, often growing in a spiral form, that stretches out and twines round any suitable support.
38.
Which of the following methods is not a way of preventing malaria parasites from person to person?
A.
Sleeping in mosquito nets
B.
Sleeping outside in the open
C.
Draining all stagnant pools of water around our homes
D.
Taking anti-malaria drugs weekly
E.
Burying all empty cans that hold water in our surroundings
Answer: B
39.
Which of the following processes is used separate insoluble solids from liquids?
A.
Sublimation
B.
Filtration
C.
Evaporation
D.
Crystallization
Answer: B
40.
Which of the following is not matter?
A.
Iced block
B.
Air
C.
Light
D.
Smoke
E.
Stone
Answer: C
THEORY QUESTIONS
1.
a)
i)
What is digestion?
ii)
Describe briefly how food is digested in the stomach.
b)
i)
What is meant by eclipse of the sun?
ii)
With the aid of a labelled diagram, distinguish between total eclipse and partial eclipse.
c)
i)
State the difference between a physical change and a chemical change.
ii)
Give one example of each of a physical change and a chemical change.
a)
i)
Digestion is the breaking down of complex or insoluble food substances into simple and absorbable forms in the body of mammals.
ii)
How food is digested in the stomach
1. Slightly alkaline food enters the stomach
2. The walls of the stomach produce/secrete gastric juice which is mixed with the food
3. The gastric juice contains dilute hydrochloric acid and protein digesting enzymes (proteases)
4. The dilute hydrochloric acid provides/creates acidic medium/condition in the stomach
5. The enzymes break down the large protein molecules into simpler units (amino acids)
6. Only protein molecules are digested in the stomach
b)
i)
Eclipse of the sun is the blocking of the light from the sun by the moon from reaching portions/parts of the earth.
OR
Eclipse of the sun occurs when the moon comes between the sun and the earth so that the moon's shadow is cast on the earth.
ii)
Total and partial eclipse
The shadow which the moon casts over the earth has both umbra (total darkness) and penumbra (partial darkness).
People in the direct region of the eclipse observe total darkness/umbra which is the total eclipse.
Those slightly out of the region observe partial darkness/penumbra which is the partial eclipse.
People outside the shadow regions will see the sun as normal.
c)
i)
Differences between a physical change and a chemical change
| Physical Change | Chemical Change |
| No new substance is formed | New substance is formed |
| It is easily reversible | It is irreversible |
| It is not accompanied by great heat change | It is accompanied by great heat change |
| There is no change in mass | There is change in mass |
| Individual components retain their properties | Individual components lose their properties |
ii)
Examples of a physical change
1. Dissolving sugar in water
2. Sand and sugar mixture
3. Sulphur and iron filing mixture
4. Melting of candle
5. Melting of ice
6. Expansion of copper
7. Filtration
8. Freezing of water
9. Grinding of chalk
10. Boiling of an egg for five minutes
11. Chewing of meat in the mouth for two minutes
12. Pounding of boiled cassava and plantain together into fufu
Examples of a chemical change
1. Burning wood
2. Reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl)
3. Rusting of iron
4. Cooking of food
5. Fermentation
6. Chewing of piece of bread in the mouth for two minutes
2.
a)
State one function each of the following parts of the human reproductive system:
i)
Penis;
ii)
Ovary;
iii)
Oviduct;
iv)
Testis;
v)
Uterus;
b)
i)
What is electrical conductor?
ii)
List two substances which are insulators.
c)
State three ways of maintaining soil fertility.
d)
Write word equation for each of the following chemical reactions:
i)
Oxygen and hydrogens;
ii)
Nitrogen and hydrogen;
iii)
Sodium and chlorine.
a)
Functions of the parts of the human reproductive system
i)
Penis
It is used to introduce/discharge sperms into the vagina.
ii)
Ovary
It produces female gametes/sex cells/ova/hormones.
iii)
Oviduct
It is a place where fertilization occurs/passage for the egg released from the ovary to the uterus.
iv)
Testis
Produces sperms/male gametes/sex cells/hormones.
v)
Uterus
Site for implantation/attachment of embryo.
b)
i)
Electrical conductor is any material that will allow electric current through it.
ii)
Insulators
1. Wood
2. Plastic
3. Rubber
4. Mica
5. Porcelain
6. Glass
c)
Ways of maintaining soil fertility
1. Cover cropping
2. Crop rotation
3. Addition of manure/fertilizer/compost
4. Mulching
5. Mixed farming
6. Tillage to improve aeration
7. Bush fallowing
8. Irrigation
9. Alley cropping
d)
Chemical reactions
i)
Oxygen and hydrogens
Hydrogen + Oxygen → Water
OR
Hydrogen + Oxygen → Hydrogen Peroxide
ii)
Nitrogen and hydrogen
Nitrogen + Hydrogen → Ammonia
iii)
Sodium and chlorine
Sodium + Chlorine → Sodium chloride
3.
(a)
(i)
Define the terms humidity and wind
(ii)
Name the instruments used to measure humidity and the speed of wind
(b)
(i)
What is a galaxy?
(ii)
Give one example of galaxy.
(c)
State three methods by which food can be preserved.
(d)
Explain why it is better to wear white clothes than black clothes on a sunny day.
(e)
Write down the names of the new substances formed when the following substances are allowed to react:
(i)
Sodium hydroxide and dilute sulphuric acid
(ii)
Calcium carbonate and dilute hydrochloric acid
(iii)
Ammonia and dilute sulphuric acid
(a)
(i)
Humidity is the amount of water vapour in the atmosphere
Wind is air in motion
OR
Wind is the movement of air
(ii)
Humidity is measured with hygrometer and the speed of wind is measured with anemometer
(b)
(i)
A galaxy is a collection of stars in the universe
(ii)
Milky way galaxy
(c)
Methods by which food can be preserved
1. Drying
2. Smoking
3. Canning
4. Boiling
5. Frying
6. Bottling
7. Freezing
8. Salting
(d)
Why it is better to wear white clothes than black clothes on a sunny day
1. White clothes are good emitters (radiators) and bad absorbers of heat than dark/black clothes
2. Hence white clothes remain relatively cool as compared to dark/black clothes on a sunny day
(e)
Names of the new substances formed when the following substances are allowed to react
(i)
Sodium hydroxide and dilute sulphuric acid
Reaction: 2NaOH + H2SO4 → Na2SO4 + 2H2O
New substances: Sodium sulphate/sodium tetraoxosulphate (VI) and water
(ii)
Calcium carbonate and dilute hydrochloric acid
Reaction: CaCO3 + 2HCl → CaCl2 + CO2 + H2O
New substances: Calcium chloride, carbon dioxide/carbon (IV) oxide and water
(iii)
Ammonia and dilute sulphuric acid
Reaction: 2NH3 + H2SO4 → (NH4)2SO4
New substances: Ammonium sulphate/ammonium tetraoxosulphate (VI)
4.
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
5.
(a)
(i)
What is refraction of light?
(ii)
Sketch a diagram to show the path of a light ray when it travels from air to glass.
(b)
Explain why it is difficult to separate iron and sulphur mixture after strong heating.
(c)
(i)
Give two examples of digestive enzymes produced in humans.
(ii)
For each of the enzymes given in (i), name the part of the human body where the enzyme is produced.
(d)
List four methods of applying fertilizers to crops.
(a)
(i)
Refraction of light is the bending/change in direction/change in velocity of light as it travels from one medium to another.
(ii)
(b)
Why it is difficult to separate iron and sulphur mixture after strong heating
It leads to a chemical change resulting in the formation of a compound (iron sulphide)/a compound is formed.
(c)
| Name of enzyme | Part of the human body where it is produced |
| Ptyalin | Salivary gland |
| Amylase | Pancreas/Small intestine |
| Pepsin | Stomach |
| Rennin | Stomach |
| Lipases | Pancreas/Small intestine |
| Trypsin | Small intestine |
(d)
Methods of applying fertilizers to crops
1. Ringing
2. Side placement/side dressing
3. Foliar/aerial application/spraying
4. Inter-raw placement
5. Band placement
6. Drilling
7. Broadcasting
8. Through irrigation water/fertigation
9. Top dressing
6.
(a)
(i)
Name the gas which is used in both rusting and burning
(ii)
State two ways in which rusting can be prevented in everyday life.
(b)
Classify each of the following items as element, compound, mixture or colloid:
(i)
Sodium chloride
(ii)
Sugar solution
(iii)
Fog
(iv)
Hydrogen
(v)
Sulphur
(c)
(i)
Use any three of the following to form a food chain:
Man, bird, green grass, goat, grasshopper
(ii)
Name two diseases that can be controlled by immunization.
(d)
(i)
A boy throws a stone vertically up into the air. What are the energy changes that take place as the stone falls to the ground?
(ii)
Give two appliances which use electromagnets in their operation
(iii)
List two ways in which a magnet can lose its magnetism.
(a)
(i)
The gas which is used in both rusting and burning is oxygen
(ii)
Ways in which rusting can be prevented in everyday life
1. Painting
2. Galvanizing (electroplating)
3. Greasing
4. Oiling
5. Alloying
(b)
| Element | Compound | Mixture | Colloid |
|
Sulphur
|
Sodium chloride |
Sugar solution |
Fog |
(c)
(i)
Green grass → grasshopper → bird
OR
Green grass → goat → man
(ii)
Diseases that can be controlled by immunization
1. Tuberculosis
2. Measles
3. Poliomyelitis
4. Whooping cough
5. Diphtheria
6. Tetanus
7. Yellow fever
8. Cholera
(d)
(i)
Potential energy → Kinetic energy → Sound energy → Heat energy
(ii)
Appliances which use electromagnets in their operation
1. Telephone receivers
2. Loudspeakers
3. Electric bells
4. Burglar alarms
5. Microphones
(iii)
Ways in which a magnet can lose its magnetism
1. Heating the magnet in fire
2. Striking the magnet continuously with a hammer
3. Placing it in a solenoid through which an alternating current flows