KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Which of the following forces will cause an object to move in a circular path?
A.
Centripetal force
B.
Gravitational force
C.
Inertial force
D.
Reaction force
E.
Tensional force
Answer: A
2.
Which of the following pairs of diseases can be spread easily when food is exposed to houseflies?
A.
Dysentery and malaria
B.
Malaria and tuberculosis
C.
Dysentery and cholera
D.
Cholera and tuberculosis
Answer: C
3.
The knowledge of soil texture is important because it
A.
influence plant population.
B.
determines the planting distance.
C.
determines the type of plant to be grown.
D.
influence the method of pest control.
Answer: C
4.
The dodder on milk bush is an example of
A.
a plant parasite on animal host
B.
a plant parasite on plant host
C.
an animal parasite and a plant parasite
D.
an animal parasite on an animal host
E.
an animal parasite on a plant host
Answer: B
5.
Digested food is absorbed into the blood stream through the
A.
duodenum
B.
large intestines
C.
rectum
D.
small intestines
E.
stomach
Answer: D
6.
In which units are the vast distances between stars in space measured?
A.
Knots
B.
Kilometres
C.
Furlongs
D.
Miles
E.
Light years
Answer: E
7.
Water that forms lather readily with soap is said to be
A.
clean.
B.
hard.
C.
soapy.
D.
soft.
Answer: D
8.
An example of inorganic fertilizer is
A.
ammonium nitrate.
B.
cow dung.
C.
farmyard manure.
D.
poultry dropping.
Answer: A
9.
Which of the following substances will turn red litmus paper blue?
A.
Hydrochloric acid
B.
Sodium chloride solution
C.
Sulphuric acid
D.
Water
E.
Sodium hydroxide
Answer: E
Bases turn red litmus paper to blue and sodium hydroxide is a base
10.
Which of the following substances causes acid rain when released into the atmosphere?
A.
Carbon dioxide
B.
Water vapour
C.
Sulphur dioxide
D.
cement dust
Answer: C
Sulfur dioxide reacts with water to form sulfurous acid (H2SO3) as the product.
S02(g) + H2O(l) → H2SO3(l)
11.
Which of the following management practices greatly helps in record keeping?
A.
Culling
B.
Debeaking
C.
Dehorning
D.
Identification
Answer: D
12.
When a thermometer is put in hot water, the mercury level rises because the mercury increases in
A.
density.
B.
mass.
C.
volume.
D.
weight.
Answer: C
13.
Which of the following processes result(s) in the formation of a new substance?
I. Burning of wood
II. Rusting of iron nail
III. Heating water into vapour
A.
I only
B.
I and II only
C.
II and III only
D.
I, II and III
Answer: B
I and II are chemical changes. For chemical change, new substances are formed and the process is not reversible.
14.
The arrow in the circuit symbol of either n-p-n or p-n-p transistor is always on the
A.
base lead.
B.
collector lead.
C.
emitter lead.
D.
receiver lead.
Answer: C
15.
Which of the following activities does not relate to the principles of pressure in the daily lives of humans?
A.
Drinking straw in use by the people at a party
B.
Pumping air into car tyres
C.
Filling of gallons with air
D.
A person jerking forward when a speeding car suddenly stops.
Answer: D
16.
Which of the following diseases affects the central nervous system?
A.
Cerebro Spinal Meningitis (CSM)
B.
Poliomyelitis
C.
Measles
D.
Yellow Fever
Answer: A
17.
A child suffering from Kwashiorkor lacks
A.
protein
B.
fats and oils
C.
vitamins
D.
mineral salts
E.
carbohydrates
Answer: A
18.
Which of the following modes of heat transfer is the thermos flask designed to minimize?
I. Conduction
II. Convection
III. Radiation
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: D
19.
Which of the following organisms improves soil fertility?
A.
Caterpillar
B.
Millipede
C.
Nematode
D.
Rat
Answer: B
20.
Which of the following statements is true at the boiling point of water?
A.
The mass of the water remains the same.
B.
The temperature increases.
C.
The temperature remains constant.
D.
the volume of the water increases.
Answer: C
21.
Which of the following structures takes part in human digestion?
A.
Caecum
B.
Kidney
C.
Larynx
D.
Pancreas
Answer: A
22.
Which of the following statements explain(s) why an object floats in water? A floating object
I. is less dense than water
II. is denser than water
III. has the same density as water
A.
I only
B.
II only
C.
III only
D.
I and III only
Answer: A
23.
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.
24.
Water is absorbed by roots in plants and transported to the leaves through the
A.
chlorophyll.
B.
phloem.
C.
stomata.
D.
xylem.
Answer: D
TRANSPORT SYSTEM IN PLANTS
25.
Which of the following is the name of the darkest part of a shadow formed when a large source of light falls on an object?
A.
Partial eclipse
B.
Lunar eclipse
C.
Total eclipse
D.
Penumbra
E.
Umbra
Answer: E
26.
Which of the following solids melts easily on exposure to sunlight?
A.
Animal fat
B.
Candle wax
C.
Plastics
D.
Rubber
E.
Shea butter
Answer: E
27.
The property of water that causes mosquito larvae to float on it is
A.
density.
B.
viscosity.
C.
surface tension.
D.
volume.
E.
capillarity.
Answer: C
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.
28.
A mixture of alcohol and water can best be separated by
A.
filtration.
B.
condensation.
C.
distillation.
D.
evaporation.
Answer: C
Distillation is the process of separating the components of a liquid mixture through selective evaporation and condensation. The basis of separation is the difference in the vapor pressures (volatilities) of the respective components.
29.
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.
30.
The by-product of photosynthesis is
A.
carbon dioxide.
B.
starch.
C.
oxygen.
D.
water.
Answer: C
Equation of photosynthesis
6CO2 + 6H2O → C6H12O6 + 6O2.
This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.
31.
Atmospheric pressure is measured with
A.
an anemometer
B.
a thermometer
C.
a galvanometer
D.
a barometer
E.
a voltmeter
Answer: D
32.
An example of a natural source of light is
A.
lantern.
B.
moon.
C.
glow worm.
D.
torchlight.
Answer: C
33.
Which of these objects is a magnetic substance?
A.
Aluminium
B.
Brass
C.
Copper
D.
Iron
Answer: D
34.
Plants manufacture their food using
I. carbon dioxide
II. oxygen
III. light
IV. chlorophyll
A.
I only
B.
II only
C.
I and II only
D.
I, III and IV only
E.
I, II, III and IV
Answer: D
35.
The farming system which involves the growing of one type of crop on the same piece of land every season is known as
A.
mixed cropping.
B.
mixed farming.
C.
monocropping.
D.
monoculture.
Answer: C
Difference between monocropping and monoculture
Monocropping involves continuously planting the same crop for multiple seasons, while monoculture is planting a field with a single crop for a season. An organic farm may choose to grow only squash plants in one field—this is monoculture. But next season, they instead plant only kale in that same field.
36.
The fusion of the male and female gametes is known as:
A.
copulation
B.
evolution
C.
fertilization
D.
ovulation
E.
reproduction
Answer: C
37.
The warning and safety signs on chemical containers are usually represented by a symbol placed within a
A.
circle.
B.
rectangle.
C.
square.
D.
triangle.
Answer: D
38.
The substance that sublimes when heated is
A.
baking powder.
B.
camphor.
C.
common salt.
D.
sugar.
E.
Sulphur.
Answer: B
39.
All the following are solids except
A.
aluminium
B.
lead
C.
silver
D.
potassium
E.
mercury
Answer: E
40.
The process of fusion of sperm and ovum is known as
A.
fertilization
B.
menstruation
C.
pollination
D.
reproduction
E.
lactation
Answer: A
THEORY QUESTIONS
1.
(a)
(i)
Explain the term convection as applied to heat transfer.
(ii)
Give two reasons why convection does not occur in solids
(b)
Give two effects of each of the following soil physical properties on maize cultivation:
(i)
texture;
(ii)
water holding capacity
(c)
Use any three of the following organisms to construct a food chain:
Hawk, grasshopper, man, grass, toad, grasscutter.
(d)
(i)
Consider the following elements and state which element(s) is/are metals:
11Na,7N,6C, 3Li
(ii)
Explain briefly what is observed when pieces of each of the following metals are dropped into two separate test tubes each containing dilute hydrochloric acid:
(α)
magnesium;
(β)
silver.
(a)
(i)
Convection
Transfer of heat in which warm/heated fluid become less dense and moves up and cold and denser fluid moves down
(ii)
Reasons why convection does occur in solids
1. The molecules/particles of solids are tightly packed together (held by strong bond)
2. The molecules/particles of solids are fixed in position and cannot move around for convection to take place
(b)
Effects of texture and water holding capacity on maize cultivation
(i)
Texture
1. Determines the movement of air/water in the soil
2. Determines the variety of maize to grow
3. Supports activities of organisms
4. Determines tillage practices to adopt
5. Supply mineral nutrients to crop
(ii)
water holding capacity
1. Determines time of planting of crop
2. Determines the variety of maize to grow
3. Determines growth and yield of maize
(c)
Food chains
Grass → grasshopper → toad
Grass → grasscutter → man
Grass → grasshopper → man
(d)
(i)
Metals:
1.11Na
3Li
(ii)
Observation when metals are dropped into dilute hydrochloric acid:
(α)
Magnesium dropped into dilute hydrochloric acid
Colourless gas (hydrogen) evolves/effervescence occurs
The equation for the reaction is shown below:
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
(β)
Silver dropped into dilute hydrochloric acid
No reaction occurs (No observation)
2.
(a)
(i)
Give the names of organisms which cause the following diseases:
Sleeping sickness, Cholera, Malaria, Bilharzia
(ii)
Which part of the following crops does a farmer usually grow?
Banana, cocoyam, tomato, ginger, yam, cassava
(b)
Name the organs used by the following organisms for respiration:
(i)
Tilapia
(ii)
Toad
(c)
(i)
What happens to the temperature of water that is boiling in an open container?
(ii)
Give two characteristics of a liquid.
(iii)
Name the three processes by which heat is transmitted.
(iv)
State two applications of the expansion of solids in everyday life.
(d)
Explain the following terms:
(i)
Physical change
(ii)
Chemical change
(e)
State whether each of the following is a physical or a chemical change
(i)
rusting of iron
(ii)
freezing of water
(iii)
burning of wood
(iv)
fermentation
(v)
grinding of chalk
(vi)
dissolving sugar in water
(f)
Name the compound formed when theh following elements combine:
(i)
Iron and sulphur
(ii)
Zinc and oxygen
(iii)
Sodium and chlorine
(iv)
Calcium and chlorine
(a)
(i)
| Disease | Organism |
| Sleeping sickness | Trypanosome/Trypanosoma |
| Cholera | Vibrio cholerae |
| Malaria | Plasmodium |
| Biharzia | Blood fluke/Schistosoma/Schistosome |
(ii)
| Crop | Part grown |
| Banana | Sucker |
| Cocoyam | Corm/underground stem |
| Tomato | Seed |
| Ginger | Rhizome/underground stem |
| Yam | Tuber/stem tuber/underground stem |
| Cassava | Stem cutting/cassava sticks |
(b)
Organs for respiration:
(i)
Tilapia → Gills
(ii)
Toad → Lungs or skin or mouth
(c)
(i)
The temperature remains the same/unchanged/constant
(ii)
Characteristics of a liquid
1. Has no definite shape/takes the shape of container
2. Has volume/occupies space
3. Molecules/particles are not in fixed positions
4. Molecules move about randomly
5. Not compressible
(iii)
1. Conduction
2. Convection
3. Radiation
(iv)
Applications of the expansion of solids in everyday life
1. Railway line gaps
2. Rollers in metal bridges
3. Thermostat
4. Concrete slabs
5. Riveting
6. Fixing wheels
(d)
(i)
Physical change is a change in which no new substance is formed
OR
Physical change is a change in which no new substances are formed
OR
Physical change is a change in which substances retain their individual properties.
(ii)
Chemical change is a change in which a new substance is formed
OR
Chemical change is a change in which new substances are formed
OR
Chemical change is a change in which new substances formed have entirely different properties from their constituents.
(e)
| Physical change | Chemical change |
| Freezing of water | Rusting of iron |
| Grinding of chalk | Burning of wood |
| Dissolving sugar in water | Fermentation |
(f)
(i)
Iron and sulphur → Iron sulphide/Iron (II) sulphide/Iron (III) sulphide
(ii)
Zinc and oxygen → Zinc oxide
(iii)
Sodium and chlorine → Sodium chloride
(iv)
Calcium and chlorine → Calcium chloride
3.
a)
State two precautions that should be taken to prevent the spread of each of the following diseases:
i)
cholera
ii)
smallpox
b)
Describe how you would test for starch in a leaf.
c)
i)
Explain why an inclined plane is classified as a machine.
ii)
Give two reasons why the output energy of a machine is always less than the input energy.
d)
Draw and label the structure of an atom containing three electrons. Indicate the charges of the particles.
a)
i)
Precautions taken to prevent cholera
1. Ensuring refuse/sewage does not contaminate food and water sources
2. Boiling stream/rivers/ground water before drinking
3. Washing hands after visiting the toilet
4. Washing hands/clothing and body after touching cholera patients
5. Keeping environment clean
6. Vaccination
7. Isolating cholera patients
8. Eating hot food
9. Reporting cholera cases to health authorities for action
ii)
Precautions taken to prevent smallpox
1. Living in well ventilated surroundings
2. Avoid spitting in public
3. Wearing neat/clean clothing
4. Avoiding dusty places
5. Vaccination/inoculation
6. Isolating smallpox patients
7. Reporting smallpox cases to health authorities for action
b)
How to test for starch in a leaf
1. Dip the leaf in boiling water for some time
2. Put the boiled leaf in alcohol/methylated spirit
3. Wash in warm water
4. Dip in iodine solution
5. The leaf turns blue black which confirms the presence of starch in the leaf
c)
i)
Why an inclined plane is classified as a machine
1. It enables work to be done easier/faster
2. A heavier load could be overcome with a smaller effort by pushing it up the plane than by lifting it directly upwards
ii)
Reasons why the output energy of a machine is always less than the input energy
1. Part of the input energy is used to overcome friction
2. Part of the input energy is used to overcome inertia
3. Part of the input energy is used to overcome gravitational force
d)
4.
a)
i)
What is soil erosion?
ii)
Name two methods of controlling soil erosion.
b)
Explain each of the following terms as used in ecology:
α)
Adaptation;
β)
Endangered species.
c)
i)
Give one example of hard water.
ii)
Explain why it is advisable to drink water which is hard.
d)
i)
What is magnetic field?
ii)
State two methods of making magnets.
a)
i)
Soil erosion is the washing away/removal of the top soil by water or wind
ii)
Methods of controlling soil erosion
1. Terracing
2. Strip cropping
3. Contour ploughing
4. Wind breaks/afforestation/tree planting
5. Mulching
6. Cover cropping
7. Practising crop rotation
8. Bush fallowing/land rotation
b)
α)
Adaptation is the ability of an organism to survive in a given environment using special features
β)
Endangered species are plants and animals facing extinction/numbers are decreasing.
c)
i)
Examples of hard water
1. Well water
2. Sea water/lagoon water
3. Borehole
ii)
Why it is advisable to drink hard water
1. It contains ions of calcium which are good for strong bones and teeth
2. It helps to reduce heart ailments
d)
i)
Magnetic field is the area around a magnet where the effect of the force of a magnet can be felt/experienced.
ii)
Methods of making magnets
1. Hammering/strong heating in the earth's magnetic field
2. Stroking
3. Electrical
4. Induction
5.
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.
6.
(a)
State two examples of a
(i)
carnivore;
(ii)
herbivore.
(b)
What is the difference between egestion and excretion?
(c)
Explain briefly why
(i)
gold is used to make necklaces and earrings.
(ii)
steel is used instead of iron to make car bodies
(d)
(i)
What is surface tension?
(ii)
Explain why the surface of water in a container is not flat but curved.
(a)
(i)
Examples of carnivores
1. Tiger
2. Lion
3. Cat
4. Wolf
5. Leopard
6. Hyena
7. Polar Bear
8. Cheetah
9. Giant Panda
10. Felidae
11. Sharks
12. Venus Fly Traps
13. Dog
14. Crocodile
(ii)
Examples of herbivores
1. Elephant
2. Sheep
3. Goat
4. Deer
5. Antelope
6. Cow
7. Grasscutter
8. Pandas
9. Gorillas
10. Elk
11. Zebras
12. Grasshopper
13. Buffalo
14. Rabbit
(b)
Difference between egestion and excretion
Egestion is the removal of undigested food substances from the body while excretion is the removal of metabolic wastes/substances.
(c)
(i)
Why gold is used to make necklaces and earrings
Gold is non-reactive/does not react with atmospheric oxygen/gases and hence maintains its shiny surface/lustre/colour for a long time.
(ii)
Why steel is used instead of iron to make car bodies
Steel is stronger than iron and does not rust/corrode easily.
(d)
(i)
Surface tension is the propertey of a liquid that makes the surface behave as if it were a stretched elastic skin/membrane.
(ii)
Why the surface of water in a container is not flat but curved
The adhesive force between water molecules and the container is greater than the cohesive forces holding the water molecules together.