KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
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
2.
Non-reactive metals are preferred in making ornaments and jewellery because they
A.
are attractive.
B.
do not react with atmospheric oxygen.
C.
do not retain their luster.
D.
are corrosive.
Answer: B
3.
The most appropriate to adopt when growing vegetables in the dry season is
A.
watering.
B.
transplanting.
C.
pest control.
D.
fertilizer application.
Answer: A
4.
In modern electrical wirings the colour code for the live wire is
A.
blue.
B.
brown.
C.
green.
D.
green and yellow.
Answer: B
5.
An atom has 20 nucleons and 9 protons. What is its neutron number?
A.
9
B.
10
C.
11
D.
12
Answer: C
Nucleon = Proton + Neutron
Neutron = Nucleon - Proton
Neutron = 20 - 9 = 11
6.
The heavenly body that produces and emits its own light is
A.
Mars.
B.
meteorite.
C.
the moon.
D.
the sun.
E.
Venus.
Answer: D
7.
Some insects are able to walk on water because
A.
they are lighter than water.
B.
their skins cannot be penetrated by water.
C.
the surface of the water acts like an elastic skin.
D.
the surface of water is curved.
Answer: C
The surface of the water acts like an elastic skin due to surface tension.
Surface tension is the force or property of a liquid which makes the surface to behave as if it were a stretched elastic skin or membrane.
8.
Which of the following sources of energy is/are renewable?
I. Wind
II. Coal
III. Crude oil
A.
I only
B.
I and II only
C.
II and III only
D.
I,II and III
Answer: A
Renewable Energy
Renewable energy is defined as energy that is produced by natural resources—such as sunlight, wind, rain, waves, tides, and geothermal heat—that are naturally replenished within a time span of a few years.
A renewable energy source means energy that is sustainable - something that can't run out, or is endless, like the sun.
Sources of Renewable Energy
1. Solar energy
2. Wind energy
3. Hydro energy
4. Tidal energy
5. Geothermal energy
6. Biomass energy
9.
Which of these is not a characteristic of all living things?
A.
Transpiration
B.
Growth
C.
Reproduction
D.
Feeding
E.
Respiration
Answer: A
10.
The use of resistant varieties of crop in controlling diseases is described as
A.
biological control method.
B.
chemical control method.
C.
cultural control method.
D.
physical control method.
Answer: A
11.
Calculate the work done when a weight of 20.0 N is lifted vertically through a distance of 10.0 cm
A.
2000.0 J
B.
200.0 J
C.
20.0 J
D.
2.0 J
E.
0.2 J
Answer: D
Work done = Force x Distance
Force = 20.0 N
Distance = 10.0 cm
The S.I unit of distance is metre. Hence convert the 10.0 cm to metre by dividing by 100
10 cm = m
Work done = 20 N x m = 2 J
Notes:
1. 20 divides itself 1 time and 100, 5 times
2. 5 divides itself 1 time and 10, 2 times
12.
The main pollutant from domestic fires is
A.
carbon monoxide.
B.
sulphur dioxide.
C.
water vapour.
D.
oxygen.
E.
ammonia
Answer: A
13.
Which of the following substances are matter?
I. Hydrogen
II. Air
III. Stone
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: D
Matter is Anything that can be weighed and takes up space. Therefore, the matter has both mass and volume. The cosmos is made up of a wide variety of substances and forms of stuff. Physical properties like color or mass. Chemical properties like how one form of matter interacts with another type of matter, are used by chemists to define matter.
All the above has mass (weight) and can occupy space.
14.
A torchlight derives its energy from
A.
petrol
B.
kerosene
C.
a magnet
D.
gas oil
E.
a dry cell
Answer: E
15.
The figure below is a diagram of a fish.
Use it to answer the question below.
The part labelled V is used for
A.
balancing.
B.
steering.
C.
surfacing.
D.
paddling.
Answer: B
16.
Plants lose water through a process called
A.
photosynthesis
B.
fertilization
C.
transpiration
D.
respiration
E.
evaporation
Answer: C
17.
The part of sugar cane that is usually used for planting is the
A.
corm.
B.
leaf.
C.
stem.
D.
sucker.
Answer: C
18.
The chemical substances which help in the digestion of food are known as
A.
enzymes.
B.
hormones.
C.
plasma.
D.
vitamins.
Answer: A
19.
Which of the following substances is a compound?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Water
Answer: D
20.
An example of a mono-gastric animal is
A.
cattle.
B.
goat.
C.
sheep.
D.
rabbit.
Answer: D
Mono-gastric animals are characterized by having a simple, single-chambered stomach. Unlike ruminants (like cows and sheep) which have multiple stomach compartments, monogastrics have just one. Examples include humans, pigs, horses, rabbits, dogs, and cats.
21.
Which of the following substances is necessary for the formation of food in plants?
A.
Carbon dioxide
B.
Nitrogen
C.
Oxygen
D.
Starch
E.
Sugar
Answer: A
22.
The bottom of a pool of water appears closer to the surface than it is. Which of the following properties accounts for this observation?
A.
Reflection.
B.
Transparency water
C.
Refraction
D.
Rectilinear propagation
Answer: C
23.
The farm animal which has crop as part of its digestive system is the
A.
fowl.
B.
goat.
C.
pig.
D.
sheep.
Answer: A
24.
Which of the following organisms is/are multicellular?
I. Amoeba
II. Paramecium
III. Onion
A.
I only
B.
III only
C.
I and III only
D.
II and III only
Answer: B
25.
Disposal of urine and faeces into a river used for domestic purposes, may cause the outbreak of
A.
bilharzia.
B.
malaria.
C.
river blindness.
D.
tetanus.
E.
tuberculosis.
Answer: A
Schistosomiasis, also known as bilharzia, is an infection caused by a parasitic worm that lives in fresh water in subtropical and tropical regions.
26.
Two unknown solutions labelled A and B were brought to a JHS 3 class. It was observed that in solution A, red litmus paper changed colour to blue, whiles in solution B, red litmus paper retained its colour. What could be the content of solution A?
A.
Car battery fluid
B.
Salt solution
C.
Baking soda
D.
Orange juice
Answer: C
Base turns red litmus paper blue. Baking soda is a base
27.
Which of the following elements is a macro-nutrient of plants?
A.
Copper
B.
Manganese
C.
Molybdenum
D.
Sulphur
Answer: D
Macro-nutrients are required by plants in large amounts and micronutrients are required in trace amounts.
| Macro-nutrients | Micro-nutrients |
|
1. Carbon (C)
|
1. Iron (Fe)
|
28.
What sickness are you likely to be suffering from when you have blood in your urine?
A.
Typhoid
B.
Syphilis
C.
Cholera
D.
Bilharzia
E.
Ulcer
Answer: D
29.
In the pin-hole camera, the image formed is always
A.
erect and bright.
B.
erect and blurred.
C.
inverted and real.
D.
inverted and virtual.
Answer: C
30.
Which of the following diseases will result from eating improperly cooked meat?
A.
Tapeworm infestation
B.
Guinea worm infestation
C.
Small pox
D.
Leprosy
E.
Measles
Answer: A
31.
The relative proportions of the different particle sizes in a soil sample refer to soil
A.
temperature.
B.
texture.
C.
structure.
D.
porosity.
Answer: C
32.
Which of the following devices requires the use of transistors in its operation?
A.
Computer
B.
Electric heater
C.
Microphone
D.
Wall clock
Answer: A
33.
Which of the following sources of light is natural?
A.
Filament bulb
B.
Fluorescent tube
C.
Glow worm
D.
Fire cracker
Answer: C
34.
A car battery produces electrical energy from
A.
Chemical energy
B.
Sound energy
C.
Kinetic energy
D.
Heat energy
E.
Potential energy
Answer: A
35.
Which of the following is the sense organ for sight?
A.
Skin
B.
nose
C.
eye
D.
ear
E.
tongue
Answer: C
36.
An example of a plant micro-nutrient is
A.
calcium.
B.
copper.
C.
magnesium.
D.
potassium.
Answer: B
37.
Arrange the following types of water in order of increasing hardness.
I. Tap water
II. Sea water
III. Distilled water
IV. Rain water
A.
IV, III, II, I
B.
III, IV, I, II
C.
II, I, IV, III
D.
I, II, III, IV
Answer: B
Increasing means from the lowest to the highest.
Hard water is water that does not lather easily/readily with soap/water which contains Ca2+/Mg2+/Ca/Mg ions/salt.
38.
When a green leaf is placed in a test tube containing ethanol and heated over a water bath the leaf
A.
becomes soft
B.
changes colour to brown
C.
changes colour to blue-black
D.
is decolorized
Answer: D
39.
Which of the following products is not excreted by the skin?
A.
Water
B.
Sweat
C.
Urea
D.
Common salt
E.
saliva
Answer: E
40.
The chemical symbol for potassium is
A.
Fe
B.
K
C.
P
D.
Pb
E.
Zn
Answer: B
THEORY QUESTIONS
1.
(a)
(i)
Explain the term friction
(ii)
Give two methods of reducing friction
(iii)
A rigid bar is used to lift a stone
α)
Draw a diagram showing the effort, pivot and load positions
β)
If the length of the bar is 100 cm and the pivot is placed 80 cm from the effort, calculate the load distance
(b)
(i)
Explain the term excretion
(ii)
State the organs in human beings which excrete the following waste products:
α)
Sweat
β)
Carbon dioxide
γ)
Urine
(c)
(i)
What is a food chain?
(ii)
Draw a food chain using the following organisms:
Hawk, cassava leaf, lizard and grasshopper
(d)
State three conditions necessary for the germination of seed.
(e)
(i)
Name two diseases which can be transmitted sexually
(ii)
Give two features which can be passed on from parents to children
(a)
(i)
Friction is the force that opposes the relative (sliding) motion between two surfaces in contact with one another.
(ii)
Methods of reducing friction
1. Lubrication
2. Using ball bearings
3. Greasing
4. Polishing the surfaces to make them smooth
(iii)
α)
β)
Effort distance + Load distance = Length of bar
Length of bar = 100 cm
Effort distance = 80 cm
80 cm + Load distance = 100 cm
Load distance = 100 cm - 80 cm
Load distance = 20 cm
(b)
(i)
Excretion is the process of removing metabolic waste/substances from the body of a living organism.
(ii)
| # | Waste substances | Organs |
| α) | Sweat | Skin |
| β) | Carbon dioxide | Lungs |
| γ) | Urine | Kidneys |
(c)
(i)
A food chain is the linear sequence of feeding relationship that shows the transfer of energy from one organism to another through feeding and being fed on by another.
(ii)
Cassava leaf → grasshopper → lizard → hawk
(d)
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
(e)
(i)
Diseases which can be transmitted sexually
1. Gonorrhea
2. AIDS (Acquired Immune Deficiency Syndrome)
3. Syphilis
(ii)
Features which can be passed on from parents to children
1. Weight
2. Intelligence
3. Colour of the skin
4. Ability to roll the tongue
5. Temperature
6. Height/stature of an individual
7. Colour of eyes
8. Colour of hair
9. Blood group
10. Shape of face/nose/head/eye
11. Haemophilia
12. Albinism
13. Sex
2.
a)
i)
State two differences between an ecosystem and a habitat.
ii)
What is meant by the term blood?
b)
Explain why it is difficult to separate iron and sulphur mixture after strong heating.
c)
Draw and label a diagram of a ray of light which makes an angle of 350 with the surface of a plane mirror.
d)
State two
i)
advantages of a land rotation.
ii)
disadvantages of land rotation.
a)
i)
| Ecosystem | Habitat |
| Larger | Smaller |
| Larger number of species | Smaller number of species |
| Involves different species | Involves a specific species |
ii)
Blood is a body fluid that transports oxygen and nutrients to the cells and carries away carbon dioxide and other waste products.
b)
Reasons why iron and suphur cannot be separated when heated
After heating, a chemical change occurs and the two substances are chemically combined (compound formed) and no longer a mixture
c)
Angle of incidence = Angle of reflection
Angle of incidence + 35o = 90o
Angle of incidence = 90o - 35o
Angle of incidence = 55o
Since angle of incidence = Angle of reflection
Angle of reflection = 55o
d)
i)
Advantages of land rotation
1. It helps check the spread of diseases
2. Land regains lost nutrients after the fallow period
3. Checks spread of pests
ii)
Disadvantages of land rotation
1. Does not encourage large scale farming
2. Virgin forest is destroyed
3. Needs a lot of time and work/ not easy to practice
4. Land is not fully utilized
5. Not suitable for areas where land is scarce
6. Encourages soil erosion
3.
a)
State three functions of the female reproductive system in humans
b)
i)
What is the role of a capacitor in a circuit.
ii)
Give two examples of a compound machine
c)
i)
What is Integrated Pest Management?
ii)
State two advantages of practicing integrated pest management.
d)
i)
State two classes of mixtures.
ii)
Classify each of the following substances under the classes stated in (i)
(α) bronze;
(β) when perfume is sprayed into the air.
a)
Functions of the female reproductive system in humans
1. Produces female sex cells/eggs/ova
2. Produces the female hormones
3. Houses the embryo
4. Site for fertilization of eggs
5. Site for implantation of fertilized eggs/zygote
b)
i)
Roles of capacity in a circuit
1. Used to maintain a power supply when the device is unplunged and without a battery for a short time
2. Store electric energy/charges when they are connected to a charging circuit
3. To smooth current fluctuation for signal/control circuit
ii)
Examples of a compound/complex machine
1. Sewing machine
2. Mower
3. Tractor
4. Car
5. Mist blower
c)
i)
Integrated Pest Management
It involves the combination of all known methods of pest control to check pests
OR
Is a combination of biological chemical, cultural and physical methods to combat pests
ii)
Advantages of Integrated Pest Management
1. Less toxic residues in crops or food
2. Less expensive or easier or faster
3. More effective or destroy pests easier or faster
4. Less harmful to the environment
d)
i)
Classes of mixtures (I)
Homogenous and heterogenous
Classes of mixtures (II)
Solution, suspension and colloid
Classes of mixtures (III)
Solid - Solid, Solid - Liquid, Liquid - Liquid and Liquid - Gas
ii)
α) Bronze → Homogenous or Solution or Solid - Solid
β) Perfume sprayed into the air → Heterogenous or Suspension or Liquid - Gas
4.
a)
i)
State the difference between organic fertilizer and inorganic fertilizer.
ii)
State two effects of inorganic fertilizer on the environment.
b)
Classify the following substances as acids or bases.
i)
unripe lemon juice;
ii)
wood ash;
iii)
liquid in a car battery;
iv)
bicarbonate of soda.
c)
i)
What is a fruit?
ii)
State two differences between a fruit and a seed.
d)
State the effect of heat on each of the following substances:
i)
plastics;
ii)
alcohol;
iii)
metal rod.
a)
i)
Difference between organic fertilizer and inorganic fertilizer
Organic fertilizer is obtained from plant and animals whilst inorganic fertilizers are obtained from artificial/synthetic/non-living/chemical materials.
ii)
Effects of inorganic fertilizer on the environment
1. It pollutes water bodies/causes air or land pollution
2. It increases soil acidity
3. It kills plants and other organisms in the soil
b)
Classification of substances as acids or bases
i)
unripe lemon juice → acid
ii)
wood ash → base
iii)
liquid in a car battery → acid
iv)
bicarbonate of soda → base
c)
i)
Fruit is a structure that develops from a fertlized ovary and contains a seed/seeds.
ii)
Differences between a fruit and a seed
| Fruit | Seed |
| Has two scars | Has one scar |
| Contains seed/seeds | Contains an embryo |
| Outer covering is pericarp/fruit coat | Outer covering is seed coat/testa |
| Develops from ovary | Develops from ovule |
d)
i)
Effects of heat on plastics
1. It melts
2. It burns
ii)
Effects of heat on alcohol
1. It expands
2. It evaporates
3. It boils
iii)
Effects of heat on metal rod
1. It expands
2. It melts
3. It bends
5.
(a)
Make a labelled diagram of the human eye
(b)
(i)
Name two defects of the eye.
(ii)
State how each of the defects you have named above can be corrected.
(c)
(i)
What is a satellite?
(ii)
State one difference between a natural and an artificial satellite.
(iii)
State two uses of artificial satellites.
(d)
Write down the names of the new substances formed when each of the following substances react with dilute hydrochloric acid.
(i)
Ammonia
(ii)
Sodium hydroxide
(iii)
Calcium carbonate
(a)
Labelled diagram of the human eye
(b)
(i)
Defects of the eye
1. Long sightedness/Hypermetropia
2. Short sightedness/Myopia
3. Astigmatism/Presbyopia
(ii)
Correction of defects
Long sightedness/Hypermetropia
Wearing converging/convex lens
Short sightedness/Myopia
Wearing diverging/concave lens
Astigmatism/Presbyopia
Medical treatment/use of special lenses
(c)
(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
(d)
New substances formed when reacted with dilute hydrochloric acid
(i)
Reaction: NH3 + HCl → NH4Cl
New substances formed: Ammonium chloride (NH4Cl)
(ii)
Reaction: NaOH + HCl → NaCl + H2O
New substances formed: Sodium chloride (NaCl) and water (H2O)
(iii)
Reaction: CaCO3 + 2HCl → CaCl2 + CO2 + H2O
New substances formed: Calcium chloride (CaCl2), carbon dioxide/Carbon (IV) oxide (CO2) and water (H2O)
6.
a)
An atom Y has atomic number 12. It loses two electrons in order to be stable.
i)
State the proton number of the atom before it loses electrons.
ii)
State the electron number of the atom:
α)
before it loses electrons.
β)
after losing electrons.
iii)
Name the type of ion formed by the atom when it loses two electrons.
b)
Name four farming system in crop production.
c)
i)
What is dispersal of seed?
ii)
State two characteristics of seeds dispersed by wind.
d)
Explain the term forward bias of a p-n junction diode.
a)
i)
In a neutral atom, number of electrons = number of protons
12 electrons = 12 Protons
Proton number = 12
ii)
α)
Electron number before losing 2 electrons
Electron number = 12
β)
Electron number after losing 2 electrons
Electron number = 12 - 2 = 10
iii)
Type of ion formed after losing 2 electrons
Cation/positively charged ion is formed after losing the two electrons
b)
Farming systems in crop production
1. Crop rotation
2. Land rotation
3. Monoculture
4. Mono cropping
5. Mixed cropping
6. Shifting cultivation
7. Mixed farming
8. Organic farming
9. Ecological farming/Eco-farming
c)
i)
Dispersal of seed is a process by which seeds are carried away from the parent plant.
ii)
Characteristics of seed dispersed by wind
1. Seeds are very small
2. They are very light
3. They have hair
4. They have wing-like structures
d)
Forward bias is when the positive terminal of an electric source is connected to the p-type of the diode and the negative terminal of the source is connected to the n-type of the diode resulting in the flow of charges or current.