KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
A mirror is used to direct the sun’s rays onto the classroom wall by
A.
radiation
B.
reflection
C.
conduction
D.
revolution
E.
convection
Answer: B
2.
Which of the following farm animals is/are housed in a hutch?
I. Goats
II. Pigs
III. Rabbits
A.
I only
B.
III only
C.
I and II only
D.
II and III only
Answer: B
3.
A machine lifts a load of 100 N through a vertical distance of 2 m in 10s.
What is the power of the machine?
A.
50 W
B.
20 W
C.
10 W
D.
2 W
Answer: B
Power = Work Done / Time
Work = Force x Distance
Force = 100 N
Distance = 2 m
Work = 100 x 2 = 200 J
Time = 10 s
Power = 200 J/10 S = 20 Js-1 = 20 W
4.
Which of the following associations between two organisms is always beneficial to both?
A.
Commensalism
B.
Mutualism
C.
Saprophytism
D.
Symbiosis
Answer: B
5.
Kerosene is able to reach the other end of a wick by
A.
diffusion.
B.
suction pressure.
C.
capillary action.
D.
osmosis.
Answer: C
6.
The name of the smallest blood vessel in humans is
A.
artery.
B.
arteriole.
C.
capillary.
D.
vein.
E.
venule.
Answer: C
7.
Food substances are transported from the leaves to various parts of a plant through the
A.
cambium.
B.
epidermis.
C.
phloem.
D.
xylem.
Answer: C
TRANSPOT SYSTEM IN PLANTS
8.
In the digestive system of ruminants, vitamins are synthesized in the
A.
abomasum.
B.
omasum.
C.
reticulum.
D.
rumen
Answer: D
9.
The primary purpose of respiration in man is to
I. take in oxygen.
II. release carbon dioxide.
III. regulate body temperature.
A.
I, II and III
B.
I and III only
C.
II and III only
D.
I and II only
Answer: D
Aerobic respiration takes place in the mitochondria and requires oxygen and glucose, and produces carbon dioxide, water, and energy.
The chemical equation is C6H12O6 + 6O2 → 6CO2 + 6H2O (glucose + oxygen -> carbon dioxide + water)
10.
A stone released from a catapult was able to kill a bird because
A.
the stone had a lot of energy
B.
the stone was sharp
C.
there was tension in the stone
D.
the rubber of the catapult was strong
E.
the stone was big
Answer: A
11.
Which of the following metals is an alloy?
A.
Aluminium
B.
Brass
C.
Copper
D.
Iron
E.
Zinc
Answer: B
12.
The figure below shows a simple electric circuit.
Use it to answer the question below.
The switch is represented by
A.
IV
B.
III
C.
II
D.
I
Answer: C
COMPONENTS OF CIRCUIT
13.
Which of the following insect(s) show(s) the egg, nymph and adult stages in its life cycle?
I. Grasshopper
II. Housefly
III. Mosquito
A.
I only
B.
I and II only
C.
II and III only
D.
I, II and III
Answer: A
Grasshopper life cycle
Grasshoppers are hemimetabolous insects. Hence, their life cycle consists of three stages – the egg, the nymph, and the adult.
Housefly life cycle
The life cycle of housefly comprises four stages namely, egg, larva, pupa and adult.
Mosquito life cycle
Life cycle of mosquito consists of four stages namely, egg, larval, pupal, and adult.
14.
It is necessary to keep household refuse in covered containers in order to prevent
A.
the spread of tuberculosis.
B.
the decomposition of the refuse.
C.
the spread of measles.
D.
entry of flies.
E.
entry of bacteria.
Answer: D
15.
The part of sugar cane that is usually used for planting is the
A.
corm.
B.
leaf.
C.
stem.
D.
sucker.
Answer: C
16.
Fruits which are dispersed by wind are likely to be
A.
dry.
B.
hairy.
C.
juicy.
D.
sticky.
Answer: B
17.
The temperature of 20oC on the kelvin scale is
A.
253 K.
B.
263 K.
C.
273 K.
D.
283 K.
E.
293 K.
Answer: E
Kelvin = 273 + Degree Celsius
Degree Celsius = 20
Kelvin = 273 + 20 = 293 K
18.
The shoot system of a flowering plant develops from the
A.
radicle.
B.
plumule.
C.
cotyledon.
D.
endosperm.
Answer: B
A shoot or seedling originates from the plumule of the seed’s embryo.
19.
When elements combine to form a compound the
A.
constituents can be separated by a physical process.
B.
volume of the compound is the sum of the volumes of the constituents.
C.
reaction does not involve a heat change.
D.
reaction can be represented by a chemical formula.
Answer: D
20.
In which of the following situations is work said to be done?
A.
Walking with a load on the head in an upright position
B.
Getting up from a chair
C.
Pushing against a wall which does not move
D.
Sitting still behind a desk
Answer: A
Work done = Force x Distance
For work to be done, force must be applied and distance must be covered.
When at a fixed position, distance covered is 0 hence work done will be 0 even when force is applied to a load at a fixed position.
21.
When salt is put into soups, it
A.
five months
B.
six months
C.
seven months
D.
nine months
E.
eleven months
Answer: D
22.
Heat from the sun reaches the earth by
A.
conduction
B.
convection
C.
radiation
D.
reflection
E.
refraction
Answer: C
23.
The ear is the organ for detecting
A.
colour.
B.
heat.
C.
scent.
D.
sound.
Answer: D
24.
The diagram below is an illustration of a transistor.
The arrow shows the direction of:
A.
electron movement.
B.
hole movement.
C.
electron and hole movement.
D.
negative charge movement.
Answer: A
The arrow in the symbol indicates the direction of flow of conventional current (electron movement)
25.
When a person jumps up, he/she is able to come down because of the
A.
pull of the earth's gravitational force.
B.
pull of the earth's magnetic force.
C.
resistance of the earth's atmosphere to the upward motion.
D.
pressure of the earth's atmosphere on the person.
Answer: A
26.
How many different elements are present in the compound CuCl2?
A.
Five
B.
Four
C.
Three
D.
Two
E.
One
Answer: D
27.
The skin is made up of
A.
One layer
B.
Two layers
C.
Three layers
D.
Four layers
E.
Six layers
Answer: B
28.
When gases are heated they
A.
melt.
B.
sublime.
C.
decrease in volume.
D.
decrease in intermolecular forces
Answer: D
When a particle is heated
The intermolecular forces are the attractions between the molecules when temperature increases it develops more distance between molecules and because of this attraction decreases, resulting intermolecular force decreases.
Intermolecular forces decreases on heating as the particles gain energy and start vibrating.
The intermolecular space between particles increases and they overcome the intermolecular forces.
Hence, the intermolecular forces decrease on heating because kinetic energy increases and space between particles increases.
29.
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.
30.
The type of cloud found closest to the earth's surface is
A.
cirrus.
B.
cumulus.
C.
stratus.
D.
stratocumulus
Answer: C
31.
The component of a living cell responsible for respiration is
A.
chloroplast
B.
mitochondrion
C.
nucleus
D.
vacuole
Answer: B
32.
Which of the following types of soil allows the fastest rate of drainage?
A.
Clayey soil
B.
Loamy soil
C.
Black soil
D.
Sandy soil
E.
Humus
Answer: D
33.
Which of the following preventive measures is not used in the control of tuberculosis?
A.
Isolating the patient
B.
Spitting carelessly in the environment
C.
Keeping separate cutlery, plates, cups for the patient
D.
Vaccinating young babies with BCG vaccine
E.
Spitting into a container partly filled with disinfectant
Answer: B
34.
Which of the following chemical equations is balanced?
A.
N2+H2→NH3
B.
N2+3H2→NH3
C.
N2+H2→2NH3
D.
N2+3H2→2NH3
Answer: D
35.
The part of the human ear which collect and direct sound waves is the
A.
ear drum.
B.
ear lobe.
C.
ear canal.
D.
semi circular canal
Answer: C
36.
Which of the following is not a function of the lens in the human eye? It
A.
allows light rays to pass through it
B.
refracts the light rays passing through it
C.
helps to focus the image onto the retina
D.
becomes thinner when focusing a distant object
E.
reflects part of the light rays falling on it
Answer: E
37.
The digestion of carbohydrates starts in the
A.
mouth
B.
throat
C.
stomach
D.
duodenum
E.
ileum
Answer: A
38.
Which of the following organisms is an ecto-parasite of animals?
A.
Fleas
B.
Tapeworm
C.
Liver fluke
D.
Roundworm
Answer: A
Ectoparasite: parasites that live on the surfaces of host organisms or in the skin and do not invade the inner body
Examples of ectoparasites
Fleas, head lice and bed bugs
Endoparasite
Endoparasites are parasites which live inside a host and generally inhabit areas such as the gut, lungs, heart and blood vessels.
Examples of endoparasites
Tapeworm, fluke and roundworm
39.
The substance that sublimes when heated is
A.
baking powder.
B.
camphor.
C.
common salt.
D.
sugar.
E.
Sulphur.
Answer: B
40.
Which of the following structures regulate the amount of light that enters the eye?
A.
Choroid
B.
Cornea
C.
Iris
D.
Lens
E.
Retina
Answer: C
THEORY QUESTIONS
1.
a)
State three ways in which crop rotation is important in crop production.
b)
State three properties of the image formed by a plane mirror.
c)
i)
What is photosynthesis?
ii)
Explain briefly why a digestive system is necessary in humans.
d)
Give the systematic name of the following compounds:
i)
α)
MgCl2;
β)
FeS.
ii)
What is an element?
iii)
What is the name given to a solid mixture?
a)
Importance of crop rotation
1. Increases soil fertility/Adds nitrogen to soil
2. Enhances soil structure
3. Prevents soil erosion
4. Improves soil nutrients and nutrient uptake regulation
5. Controls the spread of pests and diseases
6. Controls weed easily
7. There is effective use of the land
8. Harvest of different types of crops on the same piece of land
b)
Properties of image formed by a plane mirror
1. It is virtual
2. It is upright
3. Same size/shape as the object
4. The distance of the object from the plane mirror is the same as the distance of the image from the plane mirror
5. It is laterally inverted
c)
i)
Photosynthesis is the process by which green plant produces their own food/carbohydrate/glucose/starch using carbon dioxide and water with the presence of sunlight and chlorophyll.
ii)
Importance of digestive system
It breaks down food so that it can be used by the body for energy/cell growth or repair
d)
i)
Systematic Names
α)
MgCl2 → Magnesium Chloride
β)
FeS → Iron (II) sulphide
ii)
Element is a simple substance that cannot be broken down into smaller parts or changed into another substance or a substance whose atoms are of the same kind
iii)
The name given to a solid mixture is an alloy
2.
a)
i)
State two uses of water in agriculture.
ii)
Name two crops that are deep rooted.
b)
i)
Explain the term circulatory system in humans.
ii)
Classify each of the following processes as diffusion or osmosis:
α)
absorption of water by the roots of a plant
β)
movement of digested food from the small intestine into the blood stream
c)
i)
What is mass?
ii)
A box of equal size 3cm has a density of 2.0gcm-3.What is its mass?
d)
Give the state of each of the following substances:
i)
ash;
ii)
carbon dioxide.
a)
i)
Uses of water in agriculture
1. Cleaning
2. Irrigation
3. Fishing/Fish farming
4. For fertilizer application
5. For pest control
6. Drinking/consumption by farm animals
ii)
Deep rooted crops
1. Tomato
2. Carrots
3. Yam
4. Cassava
5. Watermelon
6. Cocoyam
7. Pumpkin
b)
i)
Circulatory system is a collection of tissues and organs which transports materials or food or water or oxygen throughout the (whole) body
ii)
α)
Absorption of water by the roots of a plant
Osmosis
β)
Movement of digested food from the small intestine into the blood stream
Diffusion
c)
i)
Mass is the amount of substance (matter) in a body or particle
Is a measure of how much matter is in an object
ii)
Density = Mass / Volume
Mass = Density x Volume
Density = 2.0 g cm-3, Length = 3 cm
Length of a cuboid (Equal size) = Length x Length x Length
Volume of the box = 3 cm x 3 cm x 3 cm = 27.0 cm3
Mass = 2.0 g cm-3 x 27.0 cm3 = 54.0 g
d)
i)
ash → solid
ii)
carbon dioxide → gas
3.
(a)
Define the term osmosis
(b)
State two examples of everyday observations which can be explained in terms of capillary action.
(c)
(i)
Name the three processes by which heat can be transferred.
(ii)
Name three appliances which use thermostat.
(d)
(i)
What is a saturated solution?
(ii)
State whether each of the following is a solution, suspension or a colloid:
Clay in water
Sugar in water
Ammonia in water
Powdered chalk in water
Potassium permanganate in water
Soap in water
(a)
Osmosis is the movement of water molecules from a region of lower concentration to a region of higher concentration through a semi-permeable membrane
OR
Osmosis is the movement of water molecules from a dilute solution to a concentrated solution through a semi-permeable membrane.
(b)
Examples of everyday observations which can be explained in terms of capillary action
1. Kerosene moving up the wick in a lamp
2. Water moving from the soil into roots of plants
3. Blotting of ink with blotting paper
4. A sponge absorbing water
5. Placing a straw into a glass of water
(c)
(i)
Processes by which heat can be transferred
1. Conduction
2. Convection
3. Radiation
(ii)
Electrical appliances which use thermostat
1. Electric pressing iron
2. Refrigerator
3. Electric cooker
4. Air conditioner
5. Electric water heater
6. Electric oven
7. Medical and scientific incubator
(d)
(i)
A saturated solution is a solution that will not dissolve any more solute added to it at a given temperature.
(ii)
| Solution | Suspension | Colloid |
|
Sugar in water
|
Clay in water
|
Soap in water |
4.
(a)
(i)
What is debeaking?
(ii)
Give two reasons why debeaking in poultry birds is important.
(b)
(i)
A steel needle carefully placed on the surface of water floats. What type of force made the steel needle to float?
(ii)
Name three substances that could be added to the water to make the steel needle to sink.
(c)
(i)
Explain why gold is preferred to iron in the making of jewelleries.
(ii)
State one way of preventing rusting.
(d)
(i)
State two elements of climate.
(ii)
Name the equipment used to measure each of the elements stated in (i) above.
(a)
(i)
Debeaking is the partial removal/trimming of the beak of poultry/domestic bird.
(ii)
Reasons why debeaking in poultry birds is important
1. To prevent vent pecking
2. To check feather pecking/plucking
3. To reduce wastage of feed
4. To check egg eating
5. To check cannibalism
(b)
(i)
Surface tension
(ii)
Substances to reduce surface tension
1. Kerosene
2. Oil
3. Soap/detergent
4. Diesel
5. Petrol
(c)
(i)
Why gold is preferred to iron in the making of jewelleries
Gold does not corrode/rust/react with water and oxygen/air/moisture and therefore maintains/keeps its nature/colour/lustre
(ii)
Ways of preventing rusting
1. Greasing/oiling/lubricating
2. Painting
3. Electroplating
4. Galvanizing
5. Alloying
6. Tin plating
7. Plastic coating
8. Sacrificial protection/cathodic protection
(d)
| i | Elements of climate | ii | Equipment used for measurement |
| Temperature | Thermometer | ||
| Rainfall | Rain gauge | ||
| Humidity | Hygrometer | ||
| Wind direction | Wind vane | ||
| Wind speed | Anemometer | ||
| Intensity of light/sunlight | Photometer/Light meter | ||
| Atmospheric pressure | Barometer | ||
5.
(a)
(i)
State two reasons which indicate that respiration and burning are similar processes.
(ii)
What is cross-pollination?
(iii)
List four methods by which cholera can be controlled and prevented.
(b)
(i)
Name the three coldest planets.
(ii)
State one reason which accounts for the coldness of the planets you have stated.
(iii)
An object of mass 150 g occupies a volume of 250 cm3. Calculate its density.
(c)
Name a suitable solvent for each of the following substances
(i)
grease
(ii)
oil paint
(iii)
alcohol
(iv)
sugar
(a)
(i)
Reasons which indicate that respiration and burning are similar processes
1. Both processes require oxygen/air to function
2. Both release energy whenever they occur
3. Both are chemical changes/involve the use of energy
(ii)
Cross-pollinationis the transfer of pollen grains from the anther of a flower to the stigma of another flower on another plant of the same species.
(iii)
Methods by which cholera can be controlled and prevented
1. Drinking of pure/boiled water
2. Burying/destroying/covering of excreta/faeces (of cholera patients)
3. Covering of food/keeping food in safes
4. Avoid eating raw vegetables or fruits which have not been washed properly
5. Eating hot foods or avoid eating cold foods
6. Washing hands after attending nature's call
7. Immunization/vaccination
(b)
(i)
Three coldest planets
1. Uranus
2. Neptune
3. Pluto
(ii)
The planets are cold because they are far away from the sun.
(iii)
Density =
Mass = 150 g
Volume = 250 cm3
Density =
Density = 0.6 gcm-3
(c)
(i)
Suitable solvents for grease
1. Kerosene
2. Petrol
(ii)
Suitable solvents for oil paint
1. Kerosene
2. Turpentine
3. Petrol
(iii)
Suitable solvent for alcohol
Water
(iv)
Suitable solvent for sugar
Water
6.
(a)
(i)
What is neutralization reaction?
(ii)
Write a balanced chemical equation for the reaction between each of the following pairs of substances:
(α)
Sodium metal and dilute hydrochloric acid
(β)
Sodium hydroxide and dilute hydrochloric acid
(b)
Explain weaning as used in animal production.
(c)
(i)
What is a Milky Way?
(ii)
State one use of artificial satellites.
(d)
(i)
What is a habitat?
(ii)
Give two examples of a habitat.
(a)
(i)
Neutralization reaction is a chemical reaction between an acid and a base to form salt and water only.
(ii)
(α)
Reaction between sodium metal and dilute hydrochloric acid
2Na(s) + 2HCl(aq) → 2NaCl(s) + H2(g)
(β)
Reaction between sodium hydroxide and dilute hydrochloric acid
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
(b)
Weaning is the changing of the offspring's diet from breast milk to other kinds of food.
(c)
(i)
Milky Way is the galaxy in which the solar system is located.
OR
Milky Way is the group of planets and stars which the earth belongs to.
(ii)
Uses of artificial satellites
1. For space exploration
2. For communication/broadcasting/telephone call
3. For weather forecasting/collecting information on the weather
4. For scientific research/experimental research/internet
5. For military purposes/spying/espionage
6. To study the universe
7. For map making
8. For navigation/satellite for navigation
(d)
(i)
Habitat is a natural living place of an organism.
OR
Habitat is a place where an organism spends parts/all of its life.
(ii)
Examples of a habitat
1. Aquatic e.g Ponds, streams, lakes, rivers, marine (sea)
2. Terrestrial e.g Forest, Savannah, thicket
3. Arboreal e.g Tree branches, leaves