KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
A solution in which no more solute will dissolve at a particular temperature is said to be
A.
concentrated.
B.
dilute.
C.
saturated.
D.
insoluble.
E.
unsaturated.
Answer: C
Solution is a homogenous mixture of solute and solvent.
The solute is the substance that is being dissolved, while the solvent is the dissolving medium.
A saturated solution can be defined as a solution in which a solvent is not capable of dissolving any more solute at a given temperature.
A dilute solution contains a small amount of solute in a large amount of solvent.
A concentrated solution contains a large amount of solute dissolved in a small amount of solvent.
2.
Which of the following organs is the center of the Central Nervous System?
A.
Kidney
B.
Liver
C.
Heart
D.
Brain
E.
Lung
Answer: D
3.
Boiling and chlorination are used in water purification to
A.
kill germs.
B.
help suspended particles to settle.
C.
remove suspended particles.
D.
remove hardness of the water.
Answer: A
4.
Which of the following arrangements is the correct order of increasing complexity of the structure?
A.
Cells → systems → tissues → organs
B.
Cells → tissues → systems → organs
C.
Cells → organs → tissues → systems
D.
Cells → systems → organs → tissues
E.
Cells → tissues → organs → systems
Answer: E
5.
The gas produced when dilute hydrochloric acid is added to calcium carbonate is
A.
ammonia.
B.
carbon dioxide.
C.
chlorine.
D.
hydrogen.
E.
oxygen.
Answer: B
Chemical Equation
CaCO3(s) + 2HCl(aq) → CaCl2 (s) + H2O(aq) + CO2(g)
CO2(g) = Carbon dioxide
6.
The outer ear consists of the
A.
ossicles and eardrum.
B.
cochlea and pinna.
C.
ossicles and cochlea.
D.
pinna and eardrum.
Answer: D
7.
An electrical engineer was in your school to replace a 20 W bulb with a 50 W bulb.
Use this information to answer the question below
The 50 W bulb is likely to
I. increase the brightness in the room.
II. increase the amount of electricity consumed.
III. destroy the habitat of pests.
A.
I, II and III
B.
I and III only
C.
II and III only
D.
I and II only
Answer: D
The higher the wattage, the brighter the light, but also the more power (amount of electricity) it uses.
8.
The following characteristics are features of all living things except ability to
A.
bring forth young ones.
B.
excrete.
C.
grow.
D.
move from place to place.
Answer: D
9.
The energy that causes the turbine of hydro-electric plant to rotate is
A.
chemical energy.
B.
potential energy.
C.
electrical energy.
D.
kinetic energy.
E.
heat energy.
Answer: D
Kinetic energy is the energy a body possesses by virtue of its motion.
10.
The figure below shows a simple electric circuit.
Use it to answer the question below.
The switch is represented by
A.
IV
B.
III
C.
II
D.
I
Answer: C
COMPONENTS OF CIRCUIT
11.
The process used to separate a mixture of iron filings and sulphur is
A.
magnetic attraction
B.
sublimation
C.
distillation
D.
evaporation
Answer: A
By magnetization we can separate sulfur and iron fillings. Take a magnet near to the mixture it will attract iron fillings and the remaining thing will be sulfur.
12.
The bad smell that comes out of a urinal is due to the presence of
A.
ammonia.
B.
hydrogen.
C.
carbon dioxide.
D.
nitrogen.
Answer: A
Ammonia has a very strong odor that is irritating.
13.
There are thick forests in some parts of the world because the climate there is
A.
Warm and dry
B.
Cool and dry
C.
Hot and dry
D.
Cool and wet
E.
Hot and wet
Answer: E
14.
An atom 2311X forms bond by losing one electron, the charge on the ion formed is
A.
-1
B.
-2
C.
+1
D.
+2
Answer: C
When an atom loses an electron it has positive charge (Cation) and gain negative charge (Anion)
Since the atomic number is 11, the atom in question is Sodium (Na). Sodium has +1 charge (Na+1 = Na+) when it loses an electron during the bond.
15.
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
16.
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
17.
The main reason for staking tomato is to ensure
A.
bigger fruit development.
B.
air circulation on the farm.
C.
upright growth of the plant.
D.
that fruits do not get rotten.
Answer: D
Staking tomatoes provides support to help keep plants off the ground while assisting in their upward growth habit.
Because many diseases and insects start at the ground level, using a structured system to keep them away from ground contact is prudent.
Staking can also be used to prevent the fruit from beginning to rot as it sits on the ground as the stalk grows overtime.
18.
The type of energy obtained when an electric bulb is connected to a batter is
A.
chemical energy.
B.
electrical energy.
C.
light energy.
D.
magnetic energy.
Answer: C
19.
The number of elements in the compound Ca(OH)2 is
A.
2
B.
3
C.
4
D.
5
Answer: B
The elements are Calcium (Ca), Oxygen (O) and Hydrogen (H)
20.
In a first class lever, the load is placed
A.
on the effort
B.
between the effort arm and the pivot
C.
at one end of the load arm
D.
between the pivot and the load arm
E.
on the pivot
Answer: C
21.
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
22.
An atom that has lost one or more electron(s) is called
A.
a molecule.
B.
a proton.
C.
am ion.
D.
a negative particle.
Answer: C
23.
A student is to measure 20 cm3 of a sodium hydroxide solution. What instrument could be used?
A.
Measuring tape
B.
Hygrometer
C.
Measuring cylinder
D.
Hydrometer
Answer: C
cm3 is volume and volume of a liquid is measured with a measuring cylinder or volumetric flask or pipettes, burettes or graduated cylinders
24.
The instrument used to measure atmospheric pressure is called
A.
a thermometer.
B.
a force meter.
C.
a barometer.
D.
an anemometer.
Answer: C
25.
Which of the following is evidence that particles in gases move faster than those in liquids and solids?
I. The scent of a perfume fills a room when its container is opened
II. Smoke spreads over a large area as burning takes place
III. The wind blows fast when it is about to rain
A.
I only
B.
III only
C.
II only
D.
I and II only
E.
I, II and III
Answer: D
26.
When mango is falling from a tree, its potential energy is changed to
A.
sound energy.
B.
heat energy.
C.
kinetic energy.
D.
chemical energy.
Answer: C
Kinetic energy is the energy which a body possesses by virtue of being in motion.
27.
Producers in an ecosystem are plants that
A.
attract insects
B.
feed on other plants
C.
feed on dead materials
D.
manufacture their own food
Answer: D
28.
Which of the following plants is propagated vegetatively?
A.
apple
B.
coconut
C.
pawpaw
D.
pear
E.
sweet potato
Answer: E
29.
Ringworm is a skin disease, which is caused by
A.
bacteria.
B.
fungi.
C.
insects.
D.
worm.
Answer: B
30.
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
31.
A viable seed is one that
A.
germinates under suitable conditions.
B.
contains oil.
C.
develops from fertilized ovary.
D.
has a pericarp.
Answer: A
32.
Use the figure below to answer the question below.
A rigid bar is balanced horizontally at a point by placing a rock on the bar as shown.
The effort is represented by
A.
P
B.
Q
C.
R
D.
X
E.
Y
Answer: A
33.
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.
34.
Which of the following is not a characteristic of all living things?
A.
Transpiration
B.
Growth
C.
Reproduction
D.
Feeding
E.
Respiration
Answer: A
35.
The practice of reducing the number of seedlings per stand for better growth is known as
A.
earthing up.
B.
filling in.
C.
pricking out.
D.
thinning out.
Answer: D
Thinning out: This is the removal of some plants from the area grown with seeds. This is done mainly to make room for the seeds to grow well.
Earthing up: is a farming technique that involves mounding soil around the base of a plant, usually a crop. This technique has been used for centuries in agriculture and has a variety of benefits for crops. One of the main reasons for earthing up is to protect the plant from extreme weather conditions.
36.
During athletics, a boy slipped on a banana peel on the ground and fell. This is because
A.
There was no friction
B.
The ground was hard
C.
The banana peel was soft
D.
The ground was sandy
E.
The frictional force was too great
Answer: A
37.
The periodic table is an arrangement of elements according to increasing
A.
atomic number.
B.
mass number.
C.
nucleon number.
D.
neutron number.
Answer: A
In periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom.
38.
A reflex action involves the
A.
brain and nerves.
B.
bones and nerves.
C.
brain and muscles.
D.
spinal cord and nerves.
Answer: D
39.
Which of the following animals reproduces without mating?
A.
Toad
B.
Lizard
C.
Dog
D.
Man
E.
Amoeba
Answer: E
40.
Which of the following habitats are you likely to find a tadpole?
A.
Bush
B.
Sea shore
C.
Pond
D.
Deep well
E.
Vegetable garden
Answer: C
THEORY QUESTIONS
1.
(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
2.
(a)
Define the following processes:
(i)
Excretion
(ii)
Respiration
(iii)
Name one organ in man which is responsible for each of the processes in (a) (i) and (ii) above
(b)
Mention three ways of protecting people from infection during an outbreak of cholera.
(c)
Write down the chemical names of the following compounds.
(i)
MgCl2
(ii)
FeS
(iii)
CuSO4
(iv)
NH4OH
(d)
List the names of the planets in order of their distances away from the sun; starting with the one nearest to it.
(a)
(i)
Excretion is the process of removing metabolic waste/substances from the body of a living organism.
(ii)
Respiration is the process whereby oxygen is used in living cells to breakdown food leading to the release of energy.
OR
Respiration involves the taking in of oxygen and giving out of carbon dioxide.
OR
Respiration is the breakdown of food to release energy.
(iii)
Excretion → skin, kidney, lung, liver
Respiration → Lungs
(b)
Ways of protecting people from infection during an outbreak of cholera
1. Vaccination
2. Isolation of infected persons
3. Maintaining good sanitary conditions
(c)
Chemical names of compounds
(i)
MgCl2 → Magnesium chloride
(ii)
FeS → Iron (II) sulphide
(iii)
CuSO4 → Copper (II) sulphate/Copper (II) tetraoxosulphate (VI)
(iv)
NH4OH → Ammonium hydroxide
(d)
List of planets of the solar system in the order they occur starting with the planet nearest the sun
1. Mercury
2. Venus
3. Earth
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune
9. Pluto
Note: you can use the below mnemonics to remember the nine planets.
My (Mercury) Very (Venus) Eyes (Earth) May (Mars) Just (Jupiter) See (Saturn) Under (Uranus) Nine (Neptune) Planets (Pluto)
3.
(a)
(i)
Explain the term balanced diet.
(ii)
Name any two classes of food which should be present in a balanced diet.
(iii)
Give one function of each class of food named in (a) (ii) above.
(b)
An object is placed in front of a pinhole camera as shown in the diagram below:
Draw in your answer book a ray diagram (not to scale) to show how the image is formed on the screen of the camera.
(c)
State the two laws of reflection of light
(d)
(i)
Describe how ions are formed from atoms.
(ii)
State two differences between a proton and an electron.
(a)
(i)
Balanced diet is a diet that contains all the essential food nutrients in the right proportions.
(ii)
Classes of food which should be present in a balanced diet
1. Carbohydrates
2. Proteins
3. Fats and oils
4. Vitamins
(iii)
Protein helps to build and repair the worn out tissues in the body
Carbohydrate gives the body the energy it needs
Fats and oils provide energy for the body
Vitamins protect the body from diseases
(b)
(c)
Laws of reflection
1. The incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane
2. The angle of incidence is equal to the angle of reflection
(d)
(i)
How ions are formed from atoms
1. Ions are formed when an atom gains or loses an electron
2. When an atom gains an electron, the number of electrons becomes greater than the number of protons and so a negative ion (Anion) is formed
3. When an atom loses an electron, the number of protons becomes greater than the number of electrons and so a positive ion (Cation) is formed
(ii)
Differences between a proton and an electron
| Proton | Electron |
| Has positive charge | Has negative charge |
| Is located inside the nucleus | Is located outside the nucleus |
| Is more massive/heavier/denser | Is less massive/lighter |
4.
a)
i)
What is soil erosion?
ii)
Give two types of soil erosion.
b)
Write the name and chemical formula of the compounds formed when the following elements combine:
i)
zinc and oxygen
ii)
calcium and chlorine
c)
i)
Distinguish between heat and temperature.
ii)
Draw and label the mercury-in-glass thermometer.
iii)
What mode of heat transfer is involved in the use of a thermometer?
a)
i)
Soil erosion is the removal/washing away of soil particles/topsoil by running water or rain or wind.
ii)
Types of soil erosion
1. Gully
2. Rill
3. Sheet
4. Splash
b)
i)
zinc and oxygen → Zinc oxide (ZnO)
ii)
calcium and chlorine → Calcium chloride (CaCl2)
c)
i)
Differences between heat and temperature
| Heat | Temperature |
| Is the energy which causes rise in temperature of bodies | Is the degree of hotness or coldness of a body |
| Measured in joules | Measured in kelvin (K) or degree celcius (oC) |
ii)
iii)
Conduction
5.
(a)
Name two:
(i)
animal products used in preparing protein-rich feed for poultry;
(ii)
plant produces used in preparing carbohydrate-rich feed for poultry.
[4 marks]
(b)
Describe briefly the water cycle.
[6 marks]
(c)
Consider the following mixtures:
Air, vinegar.
Air is essential to life.
Vinegar is a common household substance.
(i)
Name the two major components of each mixture.
(ii)
Which of the components named in (i) acts as the solvent in each of the mixtures?
[6 marks]
(d)
(i)
State two reasons why there is no life on the planet Jupiter.
(ii)
List two other outer planets without life.
[4 marks]
(a)
(i)
Animal products used in preparing protein-rich feed for poultry
1. Feather meal
2. Blood meal
3. Fish meal
4. Milk by-products
5. Meat meal
Any 2 x 1 mark = 2 marks
(ii)
Plant produces used in preparing carbohydrate-rich feed for poultry
1. Sorghum
2. Millet
3. Maize
4. Wheat
5. Rice
6. Wheat bran
Any 2 x 1 mark = 2 marks
(b)
The water cycle
Water evaporates from water bodies into the atmosphere (1 mark) where it condenses into the clouds (1 mark) and falls back into the earth's surface as rain (precipitation) (1 mark).
This then flows into water bodies (1 mark) and taken up by plants (1 mark) which transpire to give water vapour (1 mark).
6 marks
(c)
(i)
Vinegar → ethanoic acid (1 mark) and water (1 mark)
2 marks
Air → nitrogen (1 mark) and oxygen (1 mark)
2 marks
(ii)
Vinegar → water is the solvent (1 mark)
Air → nitrogen is the solvent (1 mark)
2 marks
(d)
(i)
Reasons why there is no life on the planet Jupiter
1. Extreme/cold temperatures
2. No oxygen
3. No water
4. Far away from the sun
5. Absence of solid surface
6. Toxic radiations/gases
7. Strong magnetic field
Any 2 x 1 mark = 2 marks
(ii)
Other outer planets without life
1. Saturn
2. Uranus
3. Neptune
Any 2 x 1 mark = 2 marks
6.
a)
The diagrams below are illustrations of the male and female reproductive systems for humans.
Study them carefully and answer the questions that follow
i)
Name each of the parts labelled I, II, V, VI, VII and VIII.
ii)
State the function of each of the parts labelled III, IV and VII.
iii)
Name the labelled part where each of the following processes take place:
α)
Fertilization;
β)
Production of sperm;
γ)
Ovulation.
iv)
Name two common infectious diseases that affect both the male and female reproductive system.
b)
The diagrams below are illustrations of different devices used in the farm.
Study them carefully and answer the questions that follow.
i)
Give a common name for the devices illustrated.
ii)
Name each of the devices labelled A, B and C.
iii)
State one use of each of the devices named in (ii).
iv)
State two effects of the use of the device C on the soil.
v)
State two ways of prolonging the usefulness of the device labelled A.
c)
i)
Draw the symbols for each of the following electronic components:
α)
Resistor;
β)
(p-n junction) diode;
γ)
Cell;
δ)
Light Emitting Diode / LED.
ii)
Use the symbols drawn in (i) together with a switch to draw a circuit diagram to demonstrate forward biasing of a (p-n junction) diode and the light emitting diode.
iii)
State the effect of the resistor on the (p-n junction) diode and the light emitting diode when the circuit is closed.
d)
The following activities were carried out in the laboratory.
Study them carefully and answer the questions that follow.
I.
10 g of iodated salt was added to 150 ml of water in a baker. The mixture was stirred thoroughly.
II.
Vegetable oil was added to a quantity of water in a corked flask and shaken vigorously then allowed to stand for some time.
III.
Few grams of grinded charcoal was added to water in a beaker and stirred vigorously and then allowed to stand.
i)
State what will be observed in each of the activities I, II and III.
ii)
Suggest an aim for the experiment.
iii)
State one difference between what is observed in I and III.
iv)
State a method of separation for the activity carried out in II.
a)
i)
Identification of labelled parts
I → womb(wall)/uterus
II → fallopian tube/oviduct
V → ovary
VI → vas deferens/sperm duct
VII → penis
VIII → testis
ii)
Function of III(Cervix)
Contracts/relaxes during child birth/protects foetus
Function of IV(Vagina)
1. Receives the penis/semen/sperm during sexual intercourse/for sexual intercourse
2. Passage of foetus
3. Passage of menstrual fluid
Function of VII(Penis)
Passage of sperm/semen/for sexual intercourse
iii)
Name of part where
α)
fertilization occurs: fallopian tube/Oviduct
β)
sperm is produced: testis
γ)
ovulation occurs: ovary
iv)
Common infectious diseases that affect both the male and female reproductive system
1. Syphilis
2. Herpes (simplex virus)
3. Chancroid
4. Chlamydia
5. Gonorrhea/gonorrhoea
6. Candidiasis/whites/thrush
b)
i)
Common name of devices
Garden/farm tools/farm implements/farming tool
ii)
Name of labelled devices
A → Mattock
B → Peg
C → Hand fork
iii)
Uses of A (Mattock)
1. Removing of stump roots/for stumping
2. Cutting off exposed plant roots
Use of B (Peg)
For making spots on land (for correct spacing of plants)
Uses of C (Hand fork)
1. For removing weeds on garden beds
2. To loosen hard soil surface/for stirring
3. For mixing fertilizers around plants
iv)
Effects of the use of the device C (Hand fork) on the soil
1. Improves aeration
2. Improves water entry/circulation in soil
3. Improves structure of soil
v)
Ways of prolonging the usefulness of the device labelled A (Mattock)
1. Clean tool after use
2. Use it for the right work/purpose
3. Repair broken handle
4. Keep in a cool dry place
5. Oil metallic part before storage
6. Sharpen cutting edges
7. Ensure metallic blade is tightly fitted to wooden handle
8. Keeping tools in termite free area
c)
i)
Symbols of electronic components
α)
Resistor
β)
(p-n junction) diode
γ)
Cell
δ)
Light Emitting Diode / LED
ii)
Circuit diagram showing forward biasing
iii)
Effects of resistor on diode and LED
Resistor limits current in the circuit and thereby protects diode and LED from burning off.
d)
i)
Observations made in laboratory activities
I
10 g of iodated salt was added to 150 ml of water in a baker. The mixture was stirred thoroughly
Observation: The iodated salt dissolved (completely) in the water(forming a miscible solution/mixture)
II
Vegetable oil was added to a quantity of water in a corked flask and shaken vigorously then allowed to stand for some time.
Observations
1. The oil is suspended on the surface of the water (forming an immiscible solution/mixture)
2. The oil and the water will not mix together
3. The oil and the water separates into individual layers
III
Few grams of grinded charcoal was added to water in a beaker and stirred vigorously and then allowed to stand.
Observation: The charcoal does not dissolve in the water/It settles on the surface of the water forming mixture
ii)
Suggested aim for the experiment
1. To demonstrate the method of preparation of mixtures
2. To determine whether a homogeneous mixture/solution or heterogeneous mixture/solution would be formed
3. To prepare a mixture/solution
4. To determine if the solute will dissolve/mix with the solvent/water to form a solution/mixture
iii)
Differences between activity I and III
| I | II |
| The mixture/solution is Homogeneous | The mixture/solution is Heterogeneous |
| The solute/iodated salt dissolved (completely) in the solvent/water | The solute/charcoal did not dissolve in the solution/water |
iv)
Method of separation for the activity carried out in II
Use of separating funnel