KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Which of the following organisms is likely to increase the oxygen content of the water in a pond?
A.
Fish
B.
Tadpole
C.
Mosquito larva
D.
Water lily
Answer: D
Water lily is a plant. Plants take in carbon dioxide and produces oxygen during the process of photosynthesis.
2.
Global warming is caused by the
A.
circulation of oxygen in the atmosphere.
B.
excessive release of carbon dioxide into the atmosphere.
C.
release of hydrogen into the atmosphere.
D.
circulation of nitrogen in the atmosphere.
Answer: B
3.
Which of the following activities are cultural practices in the cultivation of cabbage?
I. Prunning
II. Weeding
III. Watering
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III only
Answer: D
4.
The instrument used to measure current in an electric circuit is the
A.
ammeter.
B.
photometer.
C.
thermometer.
D.
voltmeter.
Answer: A
5.
In plants when the male gamete fuses with the egg, the first structure that is formed is the
A.
embryo.
B.
testa.
C.
fruit.
D.
seed.
E.
zygote.
Answer: E
6.
The food nutrient which ensures good health in farm animals is
A.
carbohydrates.
B.
minerals.
C.
proteins.
D.
vitamins.
Answer: D
7.
The male and female sex cells of a plant are respectively in the
A.
Sperm and egg
B.
Pollen grain and ovary
C.
Sperm and ovary
D.
Ovary and ovule
E.
Embryo and seed
Answer: B
8.
Excess carbohydrate in the human body is stored as
A.
amino acid.
B.
fatty acid.
C.
glycogen.
D.
glucose.
Answer: C
9.
A mother took her child to the hospital and upon investigation, it was noticed that the child's diet was lacking in zinc. What could this result in?
I. Decreased growth in the child
II. Anaemia and constipation
III. Inability of the body to fight infection
A.
I, II and III
B.
I and III only
C.
II and III only
D.
I and II only
Answer: B
10.
Which of the following statements about a force are true?
I. It causes moving objects to stop
II. It causes stationary objects to move
III. It can change the direction of motion
IV. It can change the shape of an object
A.
I and II only
B.
III and IV only
C.
I, II and III only
D.
I, II, III and IV
Answer: D
11.
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
12.
The force which is able to hold light objects on the surface of liquids is called
A.
surface tension
B.
friction
C.
capillarity
D.
viscosity
E.
cohesion
Answer: A
13.
The component of a living cell responsible for respiration is
A.
chloroplast
B.
mitochondrion
C.
nucleus
D.
vacuole
Answer: B
14.
Which of the following structures is not involved in blood circulation?
A.
Capillary
B.
Heart
C.
Muscle
D.
vein
Answer: C
15.
Insects can walk on the surface of water because of
A.
diffusion
B.
capillarity
C.
viscosity
D.
friction
E.
surface tension
Answer: E
16.
Which of the following parasites is a plant?
A.
Bilharzia
B.
Dodder
C.
Lice
D.
Tapeworm
Answer: B
DODDER (Plant Parasite)
17.
Which of the following agencies is responsible for providing information on the weather and climate conditions of an area?
A.
Animal Husbandry Department
B.
Extension Services Department
C.
Information Services Department
D.
Meteorological Services Department
Answer: D
18.
Which of the following substances are components of a fertile soil?
A.
Nitrogen and phosphorus
B.
Phosphorous and sulphur
C.
Phosphorous, calcium and sulphur
D.
Calcium, sulphur, nitrogen and phosphorous
E.
Nitrogen, calcium and phosphorous
Answer: D
19.
Which of the following processes is a physical change?
A.
Rusting of iron.
B.
Burning of wood.
C.
Formation of water from hydrogen and oxygen.
D.
Solidification of water into ice.
Answer: D
For a physical change, no new substance is formed. All the options except the "solidification of water into ice" are chemical changes since new substances are formed. Rusting of iron form oxidized iron, burning of wood forms ashes, chemical reaction of hydrogen and oxygen forms water.
In chemical change too, the process is not reversible but a physical change is reversible. For the solidification of water into ice, the ice could be melt back to water.
20.
The major charge carriers in p-type semiconductors are
A.
anions
B.
electrons
C.
holes
D.
neutral
Answer: C
Holes and electrons are the two types of charge carriers responsible for current in semiconductor materials. A hole is the absence of an electron in a particular place in an atom. In P-type semiconductor material, holes are the majority carriers and electrons are the minority carriers while in N-type semiconductor material, electrons are the majority carriers and holes are the minority carriers
21.
Which of the following organisms causes bilharziasis?
A.
Blood fluke
B.
Bloodworm
C.
Liver fluke
D.
Roundworm
E.
Tapeworm
Answer: A
22.
The force that binds molecules of the same substances together is called
A.
adhesion.
B.
cohesion.
C.
capillary action.
D.
surface tension.
Answer: B
Difference between adhesive and cohesive force
Cohesive force is the force that attracts molecules of the same substance while Adhesive force is the force that binds molecules of different substances together.
Why water wets glass
Water wets glass and spreads out on it because the adhesive forces between the liquid and the glass are stronger than the cohesive forces within the water.
23.
Which of the following is true about matter? It has
A.
Weight and direction
B.
Weight only
C.
Weight and volume
D.
Volume and direction
E.
Volume only
Answer: C
24.
Leguminous crops such as beans are cultivated to
A.
add humus to the soil
B.
increase the nitrate contents of soils
C.
add nitrogen to the soil
D.
make the soil loamy
E.
add protein to the soil
Answer: C
25.
The two main particles in the nucleus of an atom are
A.
neutrons and protons.
B.
neutrons and electrons.
C.
shells and neutrons.
D.
electrons and protons.
Answer: A
26.
The housefly is an agent for the spread of
A.
cholera.
B.
malaria.
C.
measles.
D.
tuberculosis
Answer: A
27.
The ovules in a flower develop to form the
A.
fruit.
B.
leaves.
C.
seeds.
D.
stem.
Answer: C
28.
Blood in the urine is a symptom of
A.
bilharzia.
B.
cholera.
C.
gonorrhoe.
D.
typhoid
Answer: A
29.
Elements that could easily lose electrons to form cations are
A.
metals.
B.
non-metals.
C.
semi-metals.
D.
noble gases.
Answer: A
30.
Brass is an alloy made up of
A.
Aluminium and zinc
B.
Copper and tin
C.
Copper and zinc
D.
Iron and carbon
E.
Steel and tin
Answer: C
31.
A farming system which involves the growing of rice and the rearing of fowls is known as
A.
crop rotation.
B.
mixed farming.
C.
mixed cropping.
D.
organic farming.
Answer: B
Mixed Cropping
When two or more crops are grown on the same land simultaneously (at the same time), it is known as mixed cropping
Mixed Farming
Growing crops as well as livestock, animal husbandry,etc all on same farm or land.
Crop Rotation
The practice of planting different crops across a sequence of growing seasons on the same plot of land to improve soil health, optimize nutrients in the soil, and combat pest and weed pressure.
32.
Caterpillar is an example of
A.
an animal parasite that feeds on plant host.
B.
a plant parasite that lives on an animal host.
C.
an animal parasite that feeds on animal host.
D.
a plant parasite that grows on plant host.
Answer: A
CATERPILLAR PARASITE
33.
In all machines, the efficiency is
A.
always 100%
B.
less than 100%
C.
more than 100%
D.
always 0%
Answer: B
34.
The anemometer is an instrument used in determining
A.
amount of rainfall.
B.
speed of wind.
C.
relative humidity.
D.
intensity of light.
Answer: B
35.
At which positions S,R,Q and P on the lever in the diagram below must a force be applied to lift the load most easily?
A.
P
B.
Q
C.
R
D.
S
Answer: A
The mechanical advantage of a lever can be calculated as shown below:
The higher the mechanical advantage, the better the machine our work output.
From the formula you will realize that the longer the distance of the effort from the pivot, the higher the mechanical advantage will be since the distance from the load and pivot is fixed (constant).
The distance P will have the highest mechanical advantage, hence that is the best position to apply the force to lift the load.
36.
The structure that stores sperms temporarily in the male reproductive system of humans is
A.
epididymis.
B.
scrotal disc.
C.
sperm duct.
D.
testes.
Answer: A
37.
The property of a metal that makes it possible for it to be drawn into a wire is called
A.
conductivity.
B.
ductility.
C.
malleability.
D.
resistivity.
Answer: B
38.
Gin can be obtained from palm wine by
A.
condensation
B.
freezing
C.
sedimentation
D.
distillation
E.
filtration
Answer: D
39.
External respiration in living organisms is also known as
A.
aerobic respiration.
B.
anaerobic respiration.
C.
gaseous respiration.
D.
tissue respiration.
Answer: C
40.
Which of the following planets are closer to the sun than the Earth?
A.
Venus and Mars
B.
Venus and Mercury
C.
Mercury and Mars
D.
Venus and Saturn
Answer: B
Venus and Mercury are more closer to the sun, Mars & Saturn are far away from the sun but more closer to the Earth
THEORY QUESTIONS
1.
(a)
List in the correct order, the organs through which food passes from the mouth to the anus.
(b)
State the components of a balanced ration for feeding poultry.
(c)
Predict the products formed when:
(i)
magnesium solution reacts with dilute hydrochloric acid;
(ii)
potassium reacts with water.
(d)
(i)
State two effects of heat on a substance.
(ii)
Potassium permangante crystals are dropped into a beaker of water and warmed:
(α)
State what would be observed;
(β)
State the phenomenon demonstrated in (α).
(a)
Order of food passes from the mouth to the anus
Mouth → oesophagus → stomach → small intestine → large intestine → anus
(b)
Components of a balanced ration
1. Carbohydrates
2. Protein
3. Fats and oil
4. Minerals
5. Vitamins
6. Water
(c)
Products formed
(i)
Magnesium chloride and hydrogen/MgCl2 and H2
Illustration
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
(ii)
Potassium hydroxide and hydrogen/KOH and H2
Illustration
2K(s) + 2H2O → 2KOH(aq) + H2(g)
(d)
(i)
Effects of heat on a substance
1. Change of state/melts/vapourises
2. Expansion/contraction/change in shape
3. Increasing temperature/decreasing temperature
4. Increase in pressure
(ii)
Potassium permangante crystals dropped into a beaker of water and warmed:
(α)
Warmed coloured water moves from the bottom of the beaker upwards
The solution turns to purple in color because of a process called diffusion.
Diffusion is the movement of molecules or atoms from high concentrated region to low concentrated region.
(β)
Phenomenon demonstrated
Heat transfer by convection/ Diffusion
2.
(a)
Mention five differences between plants and animals.
(b)
Define each of the following terms, giving one example in each case:
(i)
Compound;
(ii)
Element.
(c)
(i)
Give two differences between an electrical insulator and a conductor.
(ii)
Draw and label a simple electrical circuit made up of a cell and a switch connected to two electric bulbs connected in parallel.
(a)
Differences between plants and animals
| Plants | Animals |
| Respond slowly to stimuli | Respond quickly to stimuli |
| Autotrophic/manufacture their own food from simple inorganic materials | Heterotrophic/do not manufacture their own food |
| Level of coordination is less than in animals due to absence of complex nervous system | Have complex nervous system which is responsible for their ability to exhibit complex behaviour |
| Do not move from place to place | Move freely from place to place |
| Cells possess large and permanent vacuoles/Large vacuole | Cells possess small and temporary vacuoles |
| Cells possess chloroplasts that contain chlorophyll | Cells have no chloroplasts |
| Excess carbohydrates are stored as starch | Excess carbohydrates in cells are stored as glycogen |
| Take in carbon dioxide to prepare food and release oxygen into the atmosphere | Take in oxygen and release carbon dioxide into the atmosphere |
| Cells have cell wall | Cells have no cell wall |
| Have cellulose | Have no cellulose |
| Growth takes place at definite regions/growth is localized | Growth takes place in all body parts |
| Waste products are stored and used by plants | Animal by-products are toxic/poisonous to cell and must be excreted |
(b)
(i)
A compound is a substance which contains two or more elements chemically combined and cannot be separated by any physical method.
Examples of compounds
1. Water/H2O
2. Common salt/Sodium chloride/NaCl
3. Carbon dioxide/CO2
4. Ammonia/NH3
5. Cupric oxide/Copper (II) oxide/CuO
6. Sulphuric acid/H2SO4
7. Sodium hydroxide/NaOH
8. Ammonium chloride/NH4Cl
9. Hydrochloric acid/HCl
10. Copper (II) sulphate/Copper (II) tetraoxosulphate (VI)/CuSO4
11. Iron (II) chloride/FeCl3
12. Magnesium chloride /MgCl2
13. Iron (II) sulphide/FeS
14. Ammonium hydroxide/NH4OH
15. Calcium carbonate/Carbon (IV) oxide/CaCO3
16. Calcium chloride/CaCl2
17. Silver chloride/AgCl
18. Sodium tetraoxosulphate (VI)/Na2SO4
19. Sodium nitrate/Sodium trioxonitrate (V)/NaNO3
20. Potassium sulphate/Potassium tetraoxosulphate (VI)/K2SO4
(ii)
An element is a pure substance made up of atoms of the same kind.
OR
An element is chemically a simplest substance that cannot be broken down into any simpler form by any known chemical means.
Examples of elements (First 20 elements)
| Atomic Number | Element | Symbol |
| 1 | Hydrogen | H |
| 2 | Helium | He |
| 3 | Lithium | Li |
| 4 | Beryllium | Be |
| 5 | Boron | B |
| 6 | Carbon | C |
| 7 | Nitrogen | N |
| 8 | Oxygen | O |
| 9 | Fluorine | F |
| 10 | Neon | Ne |
| 11 | Sodium | Na |
| 12 | Magnesium | Mg |
| 13 | Aluminium | Al |
| 14 | Si | Silicon |
| 15 | Phosphorus | P |
| 16 | Sulphur | S |
| 17 | Chlorine | Cl |
| 18 | Argon | Ar |
| 19 | Potassium | K |
| 20 | Calcium | Ca |
(c)
(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)
A simple electrical circuit made up of a cell and a switch connected to two electric bulbs connected in parallel
3.
a)
State three differences between molecules in a solid state and liquid state.
b)
i)
What is a solution?
ii)
Differentiate between solutions and mixtures in terms of particle sizes.
c)
Name the elements which make up the following compounds:
i)
water
ii)
common salt
iii)
ammonia
d)
Copy and complete the table below
| Disease | Vector | Causative agent | Symptoms |
| Malaria | |||
| Sleeping sickness |
e)
i)
What is a man-made satellite?
ii)
Give two examples of natural satellites.
iii)
Mention two applications of man-made satellites
a)
Differences between molecules in a solid state and liquid state
| Solid | Liquid |
| Forces of attraction (cohesive force) between molecules are very strong | Forces of attraction (cohesive force) between molecules are weak/less strong |
| Molecules are compacted/closely packed | Molecules are less compacted/loosely packed |
| Molecules occupy fixed positions in a lattice | Molecules move about randomly |
| Molecules vibrate about a mean position | Molecules vibrate about a moving point |
| Molecules have low kinetic energy | Molecules have high kinetic energy |
b)
i)
Solution is a uniform/homogenous mixture of two or more substances.
ii)
Differences between solutions and mixtures in terms of particle sizes
| Solution | Mixture |
| Particles of the solute are far smaller than those of the solvent | Particles of the solute are of comparable size as particles of the solvent |
| Particles are not easily distinguishable/seen | Particles are easily distinguishable/seen |
c)
Compounds and their elements
i)
water → Hydrogen and Oxygen
Note: Water is H2O
ii)
common salt → Sodium and Chlorine
Note: common salt is sodium chloride (NaCl)
iii)
ammonia → Hydrogen and Nitrogen
Note: ammonia is NH3
d)
| Disease | Vector | Causative agent | Symptoms |
| Malaria | Female anopheles mosquito | Plasmodia |
1. Fever
|
| Sleeping sickness | Tsetse fly | Trypanosoma |
1. Sleepiness
|
e)
i)
Man-made satellite or Artificial satellite is a small object put/launched into space by man to orbit (move around) a planet.
ii)
Examples of natural satellites
1. Moon around the earth
2. Earth around the sun
3. Moon around Mars
iii)
Applications/Uses of man-made/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
4.
(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
|
5.
(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 |
6.
(a)
(i)
Define respiration.
(ii)
Give two differences between photosynthesis and respiration.
(b)
(i)
List the chemicals used in the preparation of carbon dioxide in the laboratory
(ii)
How would you test for carbon dioxide in the laboratory?
(c)
(i)
State four effects of a force on a body.
(ii)
A horizontal force of 250 N is applied to pull a piece of wood lying on a smooth surface through a distance of 20 m.
Calculate the work done.
(a)
(i)
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.
(ii)
Differences between photosynthesis and respiration
| Photosynthesis | Respiration |
| Carried out in green plants (only) | Carried out in all living cells |
| Uses energy | Releases energy |
| Uses water | Releases water |
| Uses carbon dioxide | Releases carbon dioxide |
| Releases oxygen | Uses oxygen |
| Produces glucose | Uses glucose |
| Takes place during the day or in night | Takes place at all times |
(b)
(i)
Chemicals used in the preparation of carbon dioxide in the laboratory
(Dilute) hydrochloric acid (HCl)/Nitric acid (HNO3)/Sulfuric Acid/Tetraoxosulphate (VI) acid (H2SO4) and Calcium carbonate (marble chips) or any carbonate
(ii)
Test for carbon dioxide in the laboratory
Carbon dioxide is passed through lime water and the lime water turns milky.
(c)
(i)
Effects of a force on a body
1. It changes direction of a moving body
2. It increases speed of a body/causes a body to accelerate
3. It decreases speed of a body/causes a body to decelerate
4. It causes a moving body to stop
5. It causes a stationary body to move
6. It causes deformation/changes the shape of a body
(ii)
Work done = Force x Distance
Work done = 250 N x 20 m
Work done = 5000 J