KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
The efficiency of a machine is given by the ratio
A.
B.
C.
D.
E.
Answer: E
2.
Which of the following fruits is dispersed by water?
A.
Coconut
B.
Mango
C.
Maize
D.
Cocoa
Answer: A
Coconut is dispersed by water
Lighter and hollow seeds like that of coconut and lotus can float in water and travel long distances in this manner.
3.
A car head lamp lights up when connected to a battery. What type of energy is obtained from the battery?
A.
Chemical energy
B.
Electrical energy
C.
Heat energy
D.
Light energy
E.
Potential energy
Answer: B
4.
In flowering plants, the stamen is made up of
A.
anther and stigma.
B.
anther and filament.
C.
stigma and filament.
D.
stigma and style.
Answer: B
5.
A system of farming that leads to continuous destruction of virgin forests is
A.
mixed farming
B.
mixed cropping
C.
pastoral farming
D.
shifting farming
Answer: D
6.
The person who studies the weather is
A.
a pilot
B.
a physician
C.
an astronaut
D.
an astrologer
E.
meteorologist
Answer: E
7.
Viable seeds are ones that
A.
are able to germinate under suitable conditions.
B.
are eaten by animals after planting.
C.
contain a lot of oil.
D.
have hard seed coat.
Answer: A
8.
Which of the following gases enable burning to take place?
A.
Oxygen
B.
Carbon dioxide
C.
Hydrogen
D.
Ammonia
E.
Nitrogen
Answer: A
9.
Which of the following statements about all living things is/are true?
I. They respire
II. They manufacture their own food
III. They grow
A.
I only
B.
II only
C.
I and II only
D.
I and III only
E.
II and III only
Answer: D
Only plants manufacture their own food.
10.
A substance of mass 10 kg has a density of 2.0 kgm-3. Calculate its volume.
A.
0.2 m3
B.
5.0 m3
C.
10.0 m3
D.
20.0 m3
Answer: B
Density =
Density x Volume = Mass
Dividing both sides by Density
Volume =
Volume =
Volume = 5 m3
11.
Kerosene and petrol are obtained from crude oil by
A.
distillation
B.
condensation
C.
filtration
D.
evaporation
E.
decantation
Answer: A
12.
Which of the following is a rhizome?
A.
Potato
B.
Ginger
C.
Onion
D.
Cocoyam
E.
Cassava
Answer: B
13.
The joule is the S.I unit for
A.
energy.
B.
force.
C.
power.
D.
pressure
Answer: A
14.
The method used to separate an insoluble solid from a liquid is
A.
crystallization.
B.
distillation.
C.
filtration.
D.
sublimation.
Answer: C
FILTRATION
15.
The bilharzia worm can enter the human body through the
A.
anus.
B.
ear.
C.
mouth.
D.
nostrils.
E.
skin
Answer: E
16.
The blood vessel that carries oxygenated blood from the lungs to the heart is unknown as
A.
pulmonary artery.
B.
pulmonary vein.
C.
vena cana.
D.
aorta.
Answer: B
17.
The intermediate host of the worm that causes bilharzia is
A.
man.
B.
mosquito.
C.
tsetse fly
D.
water snail
Answer: D
18.
Am example of soil micro-nutrients is
A.
copper.
B.
calcium.
C.
phosphorus.
D.
potassium.
Answer: A
19.
Which of the following substances is a compound?
A.
Copper
B.
Diamond
C.
Sucrose
D.
Sulphur
Answer: C
Copper and sulphur are elements. Diamond is made up of only carbon elements so can't be classified as a compound because compounds are made up of two or more different elements.
Sucrose (C12H22O11) is simply the chemical name for sugar and is a compound that consists of various elements i.e. carbon, hydrogen, and oxygen that combine chemically in a definite ratio.
20.
Which of the following diseases is contracted through sex?
A.
HIV/AIDS
B.
Anther
C.
Tuberculosis
D.
Goitre
Answer: A
21.
The type of cloud that gives rain is
A.
cumulus.
B.
cirrus.
C.
nimbus.
D.
stratus.
Answer: D
22.
The systematic name for N2O is
A.
Nitrogen (I) oxide
B.
Nitrogen (II) oxide
C.
Nitrogen (III) oxide
D.
Nitrogen (IV) oxide
Answer: A
23.
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
24.
A torch light bulb lights up when connected to a dry cell. What type of energy is obtained from the cell?
A.
Chemical energy
B.
Light energy
C.
Potential energy
D.
Electrical energy
E.
Heat energy
Answer: D
25.
Chlorine gas is an example of
A.
an atom.
B.
an element.
C.
a compound.
D.
a molecule.
Answer: D
26.
The function of blood platelets is to
A.
carry carbon dioxide.
B.
fight against diseases.
C.
help in clotting.
D.
help maintain constant body temperature.
Answer: C
27.
Which of the following pairs of structures are present in animal cells?
A.
Mitochondrion and Chloroplast
B.
Nucleus and chloroplast
C.
Vacuole and nucleus
D.
Cell wall and mitochondrion
Answer: C
28.
The process by which a naphthalene ball (camphor) placed in a box gets smaller in size is termed
A.
Melting
B.
Diffusion
C.
Evaporation
D.
Sublimation
E.
Condensation
Answer: D
Sublimation is the conversion of a substance from the solid to the gaseous state without its becoming liquid.
29.
Which of the following statements best explains why gases are more compressible than solids?
A.
Particles in gases are smaller than in solids.
B.
Gases have fixed volume but solids do not.
C.
Particles in solids have definite shape but gases have no definite shape.
D.
Particles in gases have wider intermolecular spaces as compared to solids.
Answer: D
30.
Air is an example of
A.
gas in gas mixture.
B.
liquid in liquid mixture.
C.
solid in liquid mixture.
D.
solid in solid mixture.
Answer: A
31.
An example of mixtures that can be separated by the method of filtration is
A.
sugar in water.
B.
sand in water.
C.
oil in water.
D.
ink in water.
Answer: B
32.
Which of the following life processes leads to the release of energy?
A.
Absorption of food
B.
Digestion of food
C.
Photosynthesis
D.
Respiration
Answer: D
Respiration is the biochemical process in which the cells of an organism obtain energy by combining oxygen and glucose, resulting in the release of carbon dioxide, water, and ATP (the currency of energy in cells)
33.
In reproduction, the embryo can be referred to as
A.
an ovary
B.
a fertile egg
C.
a fertilized egg
D.
a placenta
E.
a mature ovum
Answer: C
34.
When the testa of a soaked bean is removed, the seed is seen to be made up of
A.
cotyledons.
B.
embryos.
C.
micropyles.
D.
radicles.
Answer: A
35.
Clayey soil holds more water than any other type of soil because it has
A.
large particle size.
B.
large air spaces.
C.
irregular particle size.
D.
greater attraction for water.
E.
reduced air spaces.
Answer: E
36.
Which of the following activities are cultural practices used in tomato cultivation?
I. Pest control
II. Picking out
III. Fertilizer application
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: B
37.
The type of teeth used by mammals to eat food materials is
A.
canine.
B.
incisor.
C.
molar.
D.
premolar.
Answer: B
38.
Which of the following is not a communicable disease?
A.
smallpox
B.
chicken pox
C.
influenza
D.
pneumonia
E.
Tuberculosis
Answer: D
39.
The volume of water in a container rises when a piece of stone is put into the container. The change in the
volume of water is equal to the
A.
mass of the container
B.
mass of the stone
C.
density of the stone
D.
density of the water
E.
volume of the stone
Answer: E
40.
Which of the following is a liquid?
A.
Iron
B.
Mercury
C.
Brass
D.
Gold
E.
Aluminium
Answer: B
THEORY QUESTIONS
1.
(a)
(i)
What is a solution?
(ii)
Write down balanced chemical equations for the preparation of the following substances.
α)
Sodium Chloride: Prepared from a reaction between Sodium hydroxide and dilute hydrochloric acid
β)
Ammonia: Prepared from a reaction between nitrogen and hydrogen.
(b)
Classify the following under voluntary and involuntary actions:
(i)
Laughing
(ii)
Blinking of the eyes
(iii)
Sneezing
(iv)
Eating
(c)
(i)
State four characteristics which are common to all living things.
(ii)
Write down one function of each of the following:
α)
Leaves
β)
Roots
(d)
(i)
Mention two main defects of the human eye
(ii)
How are these defects corrected in each case?
(a)
(i)
A solution is a uniform/homogeneous mixture of a solute and a solvent where the solute completely disappear from sight in the solvent (liquid)
OR
A solution is formed when a solute dissolves in a solvent to form a uniform/homogeneous mixture.
(ii)
α)
Sodium Chloride: Prepared from a reaction between Sodium hydroxide and dilute hydrochloric acid
Chemical Equation: NaOH + HCl → NaCl + H2O
β)
Ammonia: Prepared from a reaction between nitrogen and hydrogen.
Chemical Equation: N2 + 3H2 → 2NH3
(b)
| Voluntary action | Involuntary action |
|
Laughing
|
Blinking of the eyes
|
(c)
(i)
Characteristics which are common to all living things
1. Respiration
2. Excretion
3. Growth
4. Reproduction
5. Nutrition
6. Sensitivity
(ii)
α)
Functions of leaves to the plant
1. They manufacture food for the plant
2. They help in getting rid of excess water in a plant
3. The exchange of gases between the atmosphere and a plant takes place through the stomata on the leaves
β)
Functions of roots to the plant
1. They anchor/hold/support the plants firmly in the soil
2. They absorb water and dissolved mineral salts from the soil
3. They store excess food in some plants
4. They are responsible for exchange of gases in some plants in marshy habitats
5. In some plants, the roots are a means of reproduction
(d)
(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
2.
(a)
(i)
What do the symbols L, N and E represent in an electric plug?
(ii)
What is the function of the fuse box in household electrical wiring?
(b)
Mention four classes of insect pest based on their feeding habits.
(c)
Classify the first four elements of the periodic table as metals and non- metals.
(d)
Name the three types of blood vessels in humans.
(a)
(i)
L → Live
N → Neutral
E → Earth
(ii)
Function of the fuse box in household electrical wiring
1. It contains fuses/thin wires which melt and cut off current when the current passing through is too large
2. It protects the appliances/electrical circuit
(b)
Classes of insect pest based on their feeding habits
1. Biting/tearing insects
2. Boring insects
3. Preying insects
4. Piercing insects
5. Chewing/rasping insects
6. Sucking insects
(c)
Classification of the first four elements of the periodic table as metals and non- metals
| Metals | Non-metals |
| Lithium | Hydrogen |
| Beryllium | Helium |
(d)
The three types of blood vessels in humans
1. Artery
2. Vein
3. Capillary
3.
a)
State three ways in which mulching restores soil resources.
b)
i)
Name the two elements that combines to form ammonia gas.
ii)
Write a balanced chemical equation for the formation of ammonia from the elements named in (i).
c)
The following information is on the feeding habits of some organisms:
i)
man feeds on grasscutter;
ii)
toad feeds on grasshopper;
iii)
snake feeds on toad;
iv)
goat feeds on grass;
v)
man feeds on hawk;
vi)
grasshopper feeds on grass;
vii)
hawk feeds on snake;
viii)
grasscutter feeds on grass.
Use all the information given above to construct a food web.
d)
i)
What is a galaxy?
ii)
State the relationship between stars and galaxies.
iii)
Explain briefly the term milky way.
a)
Ways in which mulching helps to restores soil resources
1. It checks growth of weeds (which will otherwise take water out of the soil)
2. It improves soil structure/texture (which in turn improve the soil water holding capacity/soil drainage)
3. It reduces/checks soil erosion
4. It reduces water loss from the soil by evaporation/increases water-holding capacity of soil
5. It adds nutrients/organic matter to the soil
6. It helps maintain soil temperature
7. Conserves soil nutrients
8. Improves activity of soil organisms
b)
i)
The two elements that combines to form ammonia gas
1. Nitrogen
2. Hydrogen
ii)
Balanced chemical equation for the formation of ammonia
N2 + 3H2 → 2NH3
c)
d)
i)
Galaxy is a group of stars.
OR
Galaxy is a system of stars,gases,dust/dark matter held together in the heavens/space.
OR
Galaxy is a collection of billions of stars that show a common gravitational link.
ii)
Relationship between stars and galaxies
Galaxies are held together by gravitational attraction much like a solar system while stars in the solar systems combine to form galaxies
OR
Stars makes up the galaxies
OR
Galaxies are made up of several billions of Stars
iii)
Milky way is the galaxy that contains the solar system and the earth.
OR
Milky way is a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.
4.
a)
i)
What is a food chain?
ii)
Why is the plant in any food chain referred to as producer?
iii)
What is the term given to the other organisms that depend directly or indirectly on the producer for food.
b)
The diagram below is an illustration of the picture obtained on a screen when an opaque object is placed in the in the path of a light source.
Study the diagram carefully and answer the questions that follow.
i)
Name each of the shadows that is cast on the screen:
α)
A;
β)
B.
ii)
What does the shadow of the object cast on the screen illustrate?
c)
Describe briefly how a sample of pure sugar could be obtained from a mixture of sugar and sand.
d)
State three ways by which soil can be conserved.
a)
i)
Food chain is the linear relationship between organisms that shows the transfer of energy from one organism to another through feeding and being fed on by another.
ii)
Because plants produce/make their own food through the process of photosynthesis
iii)
Consumer(s)
b)
i)
Name of shadows
α)
A → Umbra/Total shadow
β)
B → Penumbra/Partial shadow
ii)
It illustrates that light travels in a straight light
c)
How to separate Sugar from Sand
1. Pour the mixture into a funnel fitted with filter paper placed over a beaker
2. Add water to the mixture and stir for the sugar solution (sugar and water) to drain
3. The filtrate (sugar and water) is evaporated to remove the water from it leaving only the sugar
d)
Ways of conserving soil
1. Crop rotation
2. Mulching
3. Addition of fertilizer/manure
4. Avoid overgrazing
5. Afforestation
6. Avoid bush burning
7. Practice cover cropping
8. Prevent soil erosion
5.
a)
What is a neutralization reaction?
b)
State three physical properties of a soil.
c)
i)
Define the term power.
ii)
If a machine hauls a packing case of mass 50 kg up a building that is 10 m high in 30 s, calculate the power of the machine.
[g = 10 m-2]
d)
State three areas where technology is used for the benefit of humans.
a)
Neutralization reaction is the reaction between an acid and a base to form salt and water only.
b)
Physical properties of soil
1. Texture/feel
2. Structure
3. Consistence/soil strength
4. Bulk density
5. Soil colour
6. Soil temperature
7. Drainage ability
8. Water
9. Air
10. Porosity/Air space
11. Capillary action/Capillarity
12. Organism
13. Permeability
14. Nutrient content
c)
i)
Power is the rate of doing work
OR
Power is the rate at which work is done/energy is used
OR
Power is energy used up/work done per unit time.
OR
Power =
ii)
Power =
Work done = Force x Distance
Force = Mass x Acceleration due to gravity
Mass of the packing case = 50 kg
Acceleration due to gravity = 10 m-2
Force = 50 kg x 10 m-2 = 500 N
Distance = 10 m
Work done = 500 N x 10 m = 5000 J
OR
Work done = potential energy = Mass x Acceleration due to gravity x Height (mgh)
Work done = 50 x 10 x 10 = 5000 J
Time = 30 s
Power = = 166.67 W/166.7 W
d)
Areas where technology is used
1. Used in irrigation system/construction of dams/canals
2. Used in communication industries /Use of computers/satellites/telephones
3. Electronic industry
4. Metallurgical industry/iron and steel industry
5. Food processing/preservation industry
6. Energy sector/generation of electricity/nuclear energy
7. Oil and gas industry
8. Medicine
9. Transportation industry/use of vehicles/trains/aeroplanes, etc.
6.
(a)
Consider the substances listed below: carbon dioxide, gold, bronze, iron, oxygen and ink. From the list, select the substance that:
(i)
supports burning;
(ii)
is used as jewellery;
(iii)
is used for making statues.
(b)
(i)
Name two diseases associated with the circulatory system of humans.
(ii)
State one way of preventing each of the diseases named in (i).
(c)
Give two examples of each of:
(i)
major plant nutrients;
(ii)
minor plant nutrients.
(d)
(i)
State two properties of a good thermometric liquid.
(ii)
Give two examples of a good thermometric liquid.
(a)
(i)
supports burning → Oxygen
(ii)
is used as jewellery → Gold
(iii)
is used for making statues → Bronze
(b)
| Name of disease | 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
|
(c)
(i)
Examples of major plant nutrients
1. Nitrogen (N)
2. Phosphorus (P)
3. Calcium (Ca)
4. Magnesium (Mg)
5. Sulphur (S)
6. Potassium (K)
(ii)
Examples of minor plant nutrients
1. Copper (Cu)
2. Iron (Fe)
3. Zinc (Zn)
4. Manganese (Mn)
5. Boron (B)
6. Chlorine (Cl)
7. Cobalt (Co)
8. Molybdenum (Mo)
(d)
(i)
Properties of a good thermometric liquid
1. It does not wet/cling to the glass tube
2. It has a large temperature range within which it remains a liquid
3. It expands and contracts regularly/uniformly
4. It does not vaporize/condense in the tube
5. It is visible/opaque
(ii)
Examples of a good thermometric liquid
1. Mercury
2. Ethanol/Alcohol