KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
The portion of air which acts as a solvent is
A.
oxygen.
B.
carbon (IV) oxide.
C.
nitrogen.
D.
an inert gas.
Answer: C
Since the concentration of nitrogen (N2) is maximum in air (78%). Hence, the solvent is Nitrogen gas and other gases like Oxygen and other gases act as solute.
2.
Which of these is a vegetable crop?
A.
Pineapple
B.
Potato
C.
Cabbage
D.
Cassava
E.
Mango
Answer: C
3.
An example of a mixture is
A.
sodium sulphate.
B.
hydrogen chloride.
C.
ammonia.
D.
salt solution
Answer: D
Only salt solution is a mixture (mixture of salt and water). The rest are all compounds.
4.
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
5.
The process by which heat travels along a metal is called
A.
convection.
B.
conduction.
C.
expansion.
D.
radiation.
Answer: B
6.
Malaria parasites enter the human body through
A.
breathing contaminated air.
B.
drinking contaminated water.
C.
mosquito bites.
D.
tsetse fly bites
Answer: C
7.
Soup which is not well-heated gets spoilt when kept for sometime because the
A.
salt in the soup is too small.
B.
water in the soup do not all evaporate.
C.
heat in the soup is not enough to kill all bacteria.
D.
water condenses back into the soup.
Answer: C
8.
How much work is done when a kerosene tin is pushed with a force of 20 N through a distance of 2 m?
A.
0.01 J
B.
0.10 J
C.
10.0 J
D.
20.0 J
E.
40.0 J
Answer: E
Work done = Force x Distance
Force = 20 N
Distance = 2 m
Work done = 20 N x 2 m = 40 J
9.
Which of the following should be considered when slecting a site for vegetable crop production?
I. Nearness to the market
II. Topography of the land
III. Nearness to the sea
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: A
10.
When the testa of a soaked bean is removed, the seed is seen to be made up of mainly
A.
micropyles
B.
hilum
C.
radicle
D.
embryo
E.
cotyledons
Answer: E
11.
Steam changes to liquid by a process called
A.
evaporation.
B.
condensation.
C.
melting.
D.
boiling.
Answer: B
12.
An atom of an element has a neutral charge because the
A.
Protons and electrons are the same particles.
B.
Proton number and electron number are the same.
C.
Neutron number and proton number are equal.
D.
Electron number and neutron number are equal.
Answer: B
Neutral Atom: have a charge balance, which means that they have an equal number of protons and electrons.
13.
Which of the following is a microorganism?
A.
Bread mould
B.
Bacteria
C.
Leech
D.
Terminate
E.
Tick
Answer: B
14.
The parts of a bony fish that are used to control the level at which the fish swims are known as
A.
dorsal and caudal fins.
B.
caudal and pectoral fins.
C.
pectoral and pelvic fins.
D.
dorsal and pectoral fins.
Answer: C
15.
Which of the following seeds is dispersed by explosive mechanism?
A.
Coconut
B.
Cotton
C.
Okro
D.
Orange
Answer: C
16.
A metal block has a mass of 0.1kg. Calculate its volume if the density is 1.0 kgm-3.
A.
0.01 m3
B.
0.10 m3
C.
1.00 m3
D.
10.00 m3
Answer: B
Density =
Density x Volume = Mass
Dividing both sides by Density
Volume =
Volume =
Volume = 0.1 m3
17.
A plastic pen on rubbing in the hair attracts pieces of paper. What force is responsible for the attraction?
A.
Electrostatic force
B.
Frictional force
C.
Gravitational force
D.
Magnetic force
E.
Centripetal force
Answer: A
18.
Which of the following statements about plant cell is correct? It
A.
does not have a nucleus
B.
contains large vacuoles
C.
is surrounded by the cell membrane only
D.
does not have a definite shape
Answer: B
19.
One of the characteristics of a solid is that
A.
its particles are tightly packed.
B.
it assumes the shape of the container it occupies.
C.
it has no fixed volume.
D.
its particle can easily be separated.
Answer: A
20.
Which of the following is not a mammal?
A.
Whale
B.
Bat
C.
Cat
D.
Hen
E.
Mouse
Answer: D
21.
The use of resistance breeds of farm animals in controlling diseases is a
A.
biological control method.
B.
chemical control method.
C.
cultural control method.
D.
physical control method.
Answer: A
22.
What structure links the mouth to the stomach
A.
Colon
B.
Duodenum
C.
Oesophagus
D.
Rumen
E.
Trachea
Answer: C
23.
Which of the following gases enable burning to take place?
A.
Oxygen
B.
Carbon dioxide
C.
Hydrogen
D.
Ammonia
E.
Nitrogen
Answer: A
24.
Which of the following instruments is used in measuring current in an electric circuit?
A.
Voltmeter
B.
Ammeter
C.
Barometer
D.
Thermometer
E.
Anemometer
Answer: B
25.
Atmospheric pressure is measured with
A.
an anemometer
B.
a thermometer
C.
a galvanometer
D.
a barometer
E.
a voltmeter
Answer: D
26.
The fusion of an egg cell with sperm forms
A.
an ovum.
B.
an embryo.
C.
a zygote.
D.
an ovary.
E.
a placenta.
Answer: C
27.
A hunter experiences a backward force upon firing a gun. Which of the Newton's laws of motion is demonstrated in the situation?
A.
First law
B.
Second law
C.
Third law
D.
Law of inertia
Answer: C
Newton's third law states that for every action (force) in nature there is an equal and opposite reaction. If object A exerts a force on object B, object B also exerts an equal and opposite force on object A.
When a bullet is fired from a gun, the gun exerts a force on the bullet in the forward direction. This is the action force. The bullet also exerts an equal force on the gun in the backward direction. This is the reaction force.
28.
Which of the following statements are reasons for conserving energy?
I. Insufficient production of energy
II. Increasing demand of energy
III. Limiting production of carbon (IV) oxide
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: B
NOTE: One must still conserve energy even when demand of energy is not high. Conversation will ensure that the resources used for the generation of the energy is reserved for future generations
29.
Which of the following does not play any part in digestion?
A.
Mouth
B.
duodenum
C.
rectum
D.
pancreas
E.
Stomach
Answer: C
30.
Artificial satellites can be used for
I. communication.
II. oil and gas exploration.
III. meteorological studies.
A.
I only
B.
II only
C.
I and II only
D.
I, II and III
Answer: D
31.
An example of soil minor nutrient is
A.
calcium.
B.
iron.
C.
nitrogen.
D.
phosphorus.
Answer: B
32.
The part of the plant where pollination occurs is the
A.
flowers.
B.
leaves.
C.
roots.
D.
stems.
Answer: A
33.
Soil depletion is not caused by
A.
erosion.
B.
afforestation.
C.
leaching.
D.
illegal mining.
Answer: B
Afforestation is the process of introducing trees and tree seedlings to an area that has previously not been forested. Afforestation can be done through tree planting and seeding, naturally or artificially.
34.
The food substance that promotes good health is
A.
carbohydrate.
B.
fat.
C.
protein.
D.
vitamin.
E.
water.
Answer: D
35.
Which of the following statements about an opaque object is correct? An opaque object
A.
allows light to pass through it partially.
B.
allows light to pass through it fully.
C.
forms a shadow.
D.
does not form a shadow.
Answer: C
36.
The basic unit of life is the
A.
cell.
B.
nucleus.
C.
organ.
D.
tissue.
Answer: A
37.
The chief source of energy in the world today is
A.
coal
B.
crude oil
C.
natural gas
D.
uranium
E.
water
Answer: B
38.
Which of the following instruments is connected in parallel across a resistor in an electrical circuit?
A.
Ammeter
B.
Voltmeter
C.
Ohmmeter
D.
Galvanometer
Answer: B
Voltmeter: is used to measure the potential difference between two points in an electrical circuit and its connected in parallel in an electric circuit
Ammeter: is used to measure the electric current in an electric circuit and it is connected in series in an electric circuit
Galvanometer: is used to detect the presence of small electric current and voltage and its connected in series
Ohmmeter: is used to measure the electrical resistance
39.
A car battery produces electrical energy from
A.
Chemical energy
B.
Sound energy
C.
Kinetic energy
D.
Heat energy
E.
Potential energy
Answer: A
40.
Which of the following substances are major components of human blood?
I. Hormones
II. Platelets
III. Plasma
IV. White blood cells
A.
I and II only
B.
II and III only
C.
III and IV only
D.
II, III and IV only
Answer: D
The four major components of human blood are plasma, red blood cells, white blood cells, and platelets. These components work together to transport oxygen and nutrients, fight infection, and help with blood clotting.
Plasma
The liquid component of blood, making up about 55% of its volume. It's primarily water, but also contains proteins, salts, nutrients, and waste products.
Red Blood Cells (Erythrocytes)
Responsible for carrying oxygen from the lungs to the rest of the body. They contain hemoglobin, a protein that binds to oxygen.
White Blood Cells (Leukocytes)
Part of the body's immune system, fighting off infections and diseases. There are different types of white blood cells, including lymphocytes, monocytes, and granulocytes.
Platelets (Thrombocytes)
Small cell fragments that help with blood clotting, preventing excessive bleeding when blood vessels are damaged.
THEORY QUESTIONS
1.
(a)
Distinguish between the following terms:
(i)
Physical change and chemical change
(ii)
Solution and suspension
(b)
Classify the following as either a physical or chemical change
(i)
Common salt in water
(ii)
Burning of charcoal
(iii)
Melting of ice
(iv)
Hydrochloric acid in sodium hydroxide solution
(c)
(i)
What is a parasite?
(ii)
Give two examples of parasites and their hosts.
(d)
Give the chemical symbols of the following elements
(i)
Oxygen
(ii)
Chlorine
(iii)
Aluminium
(iv)
Calcium
(e)
(i)
Explain the term self-pollination
(ii)
Name four agents of pollination
(iii)
State the function of the brightly coloured petals in insect pollination
(a)
(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)
Difference between solution and suspension
A solution is a uniform/homogeneous mixture of a solute and a solvent where the solute completely disappear from sight in the solvent (liquid) whiles a suspension is a mixture of particles of an insoluble substance and a liquid whereby the particles of the substance float in the liquid. The small particles settle at the bottom of the container when it is left undisturbed.
(b)
(i)
Common salt in water → physical change
(ii)
Burning of charcoal → chemical change
(iii)
Melting of ice → physical change
(iv)
Hydrochloric acid in sodium hydroxide solution → chemical change
(c)
(i)
Parasite is any organism/living thing that lives in or on another organism/living thing called the host for its food and by so doing causes harm to the host.
(ii)
Examples of parasites and their hosts
| Parasite | Host |
| Lice | Man |
| Tick | Dog |
| Plasmodium | Man |
| Mistletoe | Cocoa/cola |
| Dodder | Milk bush/cashew plant |
| Capsids | Cocoa plant |
| Tapeworm | Cow/pig/man |
(d)
Chemical symbols
(i)
Oxygen → O
(ii)
Chlorine → Cl
(iii)
Aluminium → Al
(iv)
Calcium → Ca
(e)
(i)
Self-pollination is the transfer of pollen grains from the anther of a flower to the stigma of the same flower or to the stigma of another flower of the same plant.
(ii)
Agents of pollination
1. Insects
2. Water/Rain
3. Animal/Man/Birds/Bats
4. Wind
(iii)
Function of the brightly coloured petals in insect pollination
They produce nectar which attracts insects to the plant.
2.
(a)
(i)
What is germination of seed?
(ii)
State two conditions necessary for the germination of seed.
(b)
State four methods used in identifying farm animals.
(c)
Explain why it is easier to cut a piece of yam with a sharp knife than with a blunt knife.
(d)
State three differences between a metal and a non-metal.
(a)
(i)
Germination of seed is the sprouting/growth/development of the embryo/seed to produce a new plant/seedling.
(ii)
Conditions necessary for the germination of seed
1. Nature of seed coat
2. Water/moisture
3. Air/Oxygen
4. Suitable/optimum temperature/warmth
5. Viability of the seed
6. Enzymes
7. Sunlight/light
8. Dormancy period
(b)
Methods used in identifying farm animals
1. Tattooing
2. Banding
3. Ear tagging
4. Clipping
5. Leg tagging
6. Dyeing
7. Ear notching/punching
8. Implantation of microchips/radio transmitter
(c)
Why it is easier to cut a piece of yam with a sharp knife than with a blunt knife
Pressure is inversely proportional to the surface area.
Pressure =
Pressure ∝
With the same force, the smaller the surface area, the greater the pressure.
A sharp knife has a smaller surface area than a blunt knife. The same force used on each knife, will give greater pressure on the sharp knife than the blunt knife (smaller pressure) making cutting easier.
(d)
Differences between a metal and a non-metal
| # | Metal | Non-metal |
| 1. | Normally solid | Can be solid or liquid or gas |
| 2. | Corrosive | Non corrosive |
| 3. | Attracted by magnet | Not attracted by magnet |
| 4. | Conducts electricity | Does not conduct electricity/poor conductor of electricity |
| 5. | Conducts heat/good conductor of heat | Does not conduct heat/poor conductor of heat |
| 6. | Malleable | Not malleable |
| 7. | Ductile | Not ductile/Brittle |
| 8. | High density | Low density |
| 9. | High melting point | Low melting point |
| 10. | Has shinning/lustre surface | Has dull surface |
| 11. | Gives out electrons (forms cations) as reducing agent | Receives/accepts electrons (forms anions) as oxidizing agent |
| 12. | High tensile strength | Low tensile strength |
3.
(a)
What is a living cell?
(b)
Give one function of each of the following components of a living cell:
(i)
cell membrane
(ii)
chloroplast
(iii)
nucleus
(c)
Make sketches to show the arrangement of the particles in each of the three states of matter.
(d)
What instrument would you use to measure each of the following quantities:
(i)
volume of a liquid
(ii)
mass of a stone
(iii)
time
(iv)
speed of the wind?
(a)
Living cell is the smallest basic unit of a plant or animal/living organism
(b)
(i)
Functions of the cell membrane
1. It protects a cell
2. It allows only selected substances to enter or leave the cell
(ii)
Function of the chloroplast
It contains chlorophyll (green pigment) which traps sunlight for photosynthesis
(iii)
Functions of the nucleus
1. Embodies the genetic information (genes) of the organism
2. Makes cell division or reproduction possible
3. Controls the activites of the cell
(c)
Arrangement of molecules in a solid
Arrangement of molecules in a liquid
Arrangement of molecules in a gas
(d)
Measuring instruments
| # | Qunatity | Instrument(s) |
i. |
Volume of a liquid |
1. Measuring cylinder
|
ii. |
Mass of a stone |
1. Beam balance
|
iii. |
Time |
1. Watch/clock
|
iv. |
Speed of the wind |
Anemometer |
4.
(a)
Study the simple circuit diagram shown below and answer the questions that follow.
(i)
Identify the components labelled I, II, III, IV, V and VI
(ii)
Which component is used to close the circuit?
(iii)
State the observation that will be made when the circuit is closed.
(iv)
State the energy transformations that take place when the circuit is closed
(v)
Give the name of the circuit connection between components IV and VI
(b)
The diagram below is an illustration of an experimental set-up used for separating a mixture of water and alcohol. Study the diagram carefully and answer the questions that follow.
(i)
State the method of separation shown in the set-up.
(ii)
Identify liquid Y, with reasons.
(iii)
Give the functions of the thermometer and the water jacket X
(iv)
What physical processes are involved in the method of separating the mixture?
(v)
State the physical property which makes it possible to separate the water and alcohol.
(c)
A student performed tests on food substances A, B and C and made the following observations
| Food substance | Test | Observation |
| A | Few drops of iodine solution was added to A | The iodine solution turns blue-black |
| B | A drop of B was applied to a white sheet of paper | A translucent patch was seen on the paper |
| C | Benedict's solution was added to C and the mixture boiled | Benedicts's solution turns from blue to brick-red |
(i)
Identify food substances A, B and C.
(ii)
Give the products of digestion of A, B and C
(iii)
In which parts of the alimentary canal does the digestion of each of food substances A, B and C start?
(iv)
In which part of the alimentary canal is food substance C absorbed after digestion?
(a)
(i)
I → Cell/battery
II → Key/switch
III → Ammeter
IV → Lamp/bulb
V → Rheostat/variable resistor
VI → Voltmeter
(ii)
II/Key/Switch
(iii)
The lamp (IV) will light
OR
The ammeter (III) will deflect
OR
The voltmeter (VI) will deflect
(iv)
Chemical energy (of cell) → Electrical energy (in wires) → Light/heat energy (in bulb)
(v)
Parallel connection
(b)
(i)
Distillation/Fractional distillation
(ii)
Y → Alcohol because it has a lower boiling point than water/it boils off/evaporates first before water.
(iii)
Function of the thermometer
Is used to note/measure/determine the temperature (at which the mixtures boil/separate)
OR
It is used to note/measure/determine the boiling points of the mixtures
Function of the water jacket X
It is used to condense/cool the vapour
(iv)
Liquid →heat Vapour →cool Liquid
OR
Heating → Vaporisation → Condensation
(v)
Water and alcohol have different boiling points.
(c)
(i)
A → Starch
B → Oil/Fat/Lipid
C → Reducing/simple sugar/glucose
(ii)
A (Starch) → Glucose/fructose
B (Oil/Fat/Lipid) → Fatty acids/glycerol
C (Reducing/simple sugar/glucose) → Glucose/No digestion occurs/remains the same
(iii)
A → Mouth
B → Duodenum/small intestine
C → Not digested/passes through the system
(iv)
C (Reducing/simple sugar/glucose) is absorbed in the small intestine (ileum)
5.
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
6.
(a)
Explain why a tomato plant is likely to wilt if too much fertilizer is applied to it.
(b)
(i)
Give two differences between electrical insulators and electrical conductors.
(ii)
State two effects of illegal electrical connections in the home.
(c)
Explain each of the following terms as used to describe change of state of matter:
(i)
condensation;
(ii)
freezing.
(d)
(i)
State two diseases of the circulatory system in humans.
(ii)
Mention two ways in which each of the diseases you have stated in (d)(i) can be prevented.
(a)
Why a tomato plant is likely to wilt if too much fertilizer is applied to it
Once two solutions of different concentrations come into contact, water molecules will flow from low to higher concentrated solution. Hence application of fertilizer makes the soil solution of higher concentration so water flow out of the plant by osmosis. The tomato plant plasmolyses/loses water and wilt.
Note
Plasmolysis describes a process involving a plant cell losing water content and therefore contracting and shrinking its cytoplasm and plasma membrane away from the inside of its cell wall. This occurs if the solution surrounding a plant cell is hypertonic or has a high concentration of solutes like salt.
(b)
(i)
Differences between electrical insulators and electrical conductors
| Electrical insulators | Electrical conductors |
| Does not conduct electricity | Conducts electricity |
| Has narrow conduction energy band | Has wide conduction energy band |
| There exists a wide forbidden energy gap between valence and conduction band | Has no forbidden energy gap |
| Electrons firmly bound to nucleus | Electrons loosely bound to nucleus |
| There are no free electrons | Has more free electrons |
(ii)
Effects of illegal electrical connections in the home
1. Overload of power supply
2. Drop in voltage of electricity
3. Leads to frequent power cuts
4. Leads to electrocution/electric shock
5. May cause fire outbreak
6. May damage electrical appliances
7. Leads to loss of revenue to government
(c)
(i)
Condensation is the change from the gas state to the liquid state.
(ii)
Freezing is the change from the liquid state to the solid state.
(d)
| Disease of the circulatory system | Prevention |
| High blood pressure (Hypertension) |
1. Regular exercise
|
| Low blood pressure (Hypotension) |
1. Regular exercise
|
| Piles/Haemorrhoids |
1. Eat a lot of fruits/vegetables
|
| Leukaemia/Blood cancer |
1. Avoid smoking
|
| Varicose vein |
1. Regular exercise
|
| Arteriosclerosis |
1. Regular physical exercise
|