KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
In a third-class lever the
A.
pivot is between the load and effort
B.
pivot is absent
C.
load is between the effort and pivot
D.
effort is between the load and pivot
Answer: D
2.
Use the diagrams below to answer the question below
Which of the following statements is correct about the circuit diagrams above? The cells in diagram
A.
X are in series and the key is open.
B.
X are in parallel and the key is open.
C.
Y are in series and the key is closed.
D.
Y are in parallel and the key is closed.
Answer: A
3.
Which of the following soil types can hold the least amount of water?
A.
Loam
B.
Clay
C.
Silt
D.
Sand
E.
Sandy loam
Answer: D
4.
A mango of mass 2 kg hangs 15 m on top of a mango tree. Determine the value of the kinetic energy attained just before it hits the ground. [g = 10 m s-2]
A.
30.0 J
B.
225.0 J
C.
300.0 J
D.
3.0 J
Answer: C
Just before the mango hits the ground, the kinetic energy equals the potential energy (at rest at the top).
Potential energy = mass x acceleration due to gravity x height.
Potential energy = 2 kg x 10 m s-2 x 15 m
Potential energy = 300 J
5.
Which of the following is not a characteristic of all living things?
A.
Transpiration
B.
Growth
C.
Reproduction
D.
Feeding
E.
Respiration
Answer: A
6.
Which of the following is an excretory organ?
A.
Anus
B.
Eye
C.
Heart
D.
Skin
E.
Pancreas
Answer: D
7.
The hereditary material that is passed on from parents to offspring is known as
A.
gene.
B.
sperm.
C.
red blood cell.
D.
white blood cell.
Answer: A
8.
The method of preserving food by drying is similar to salting because in both cases germs are
A.
deprived of the air needed for growth.
B.
deprived of the water needed for growth.
C.
destroyed at high temperatures.
D.
destroyed at low temperatures.
Answer: B
9.
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
10.
A fuse is connected in an electric circuit to
A.
prevent electric shock.
B.
increase the current.
C.
prevent current from increasing.
D.
increase the heat generated.
Answer: C
A fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. It is designed to melt and separate in the event of excessive current thereby stopping or interrupting the current.
11.
In electrical circuits, the component that protects appliances against high currents is the
A.
capacitor.
B.
fuse.
C.
resistor.
D.
switch.
Answer: B
12.
The process of removing unproductive poultry birds from a flock is referred to as
A.
candling
B.
culling
C.
dehorning
D.
drenching
Answer: B
13.
An example of a third class lever is
A.
wheelbarrow.
B.
sugar tongs.
C.
pair of scissors.
D.
crowbar.
Answer: B
14.
An example of inorganic fertilizer is
A.
ammonium nitrate.
B.
cow dung.
C.
farmyard manure.
D.
poultry dropping.
Answer: A
15.
A rigid bar which is capable of turning about a fixed point is a/an
A.
inclined plane.
B.
lever.
C.
screw.
D.
wheel and axle.
Answer: B
16.
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
17.
One benefit of technology to industrialization is
A.
environmental pollution.
B.
reduction in skilful labour
C.
provision of machinery.
D.
increase in cost of production of goods.
Answer: C
18.
The current flowing through a resistor of resistance 10 ohms is 2.5 A. What is the potential difference between the two terminals of the resistor?
A.
4V
B.
12.5 V
C.
25 V
D.
50 V
Answer: C
Voltage = Resistance x Current (IR)
Voltage = 10 x 2.5 = 25 V
19.
The plant structures used for gaseous exchange are the
A.
leaves.
B.
tendrils.
C.
thorns.
D.
roots.
Answer: A
20.
Farmers do not plant the stems of maize because the stems
A.
do not have buds.
B.
are difficult to obtain.
C.
dry up too quickly.
D.
do not contain food.
Answer: A
21.
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
22.
Digestion of proteins starts from the
A.
duodenum.
B.
ileum.
C.
mouth.
D.
stomach.
Answer: D
23.
Chinchilla is a breed of
A.
goats.
B.
pigs.
C.
rabbits.
D.
sheep.
Answer: C
24.
Carbon dioxide in the blood is removed from the body through the
A.
kidneys.
B.
lungs.
C.
mouth.
D.
skin.
Answer: B
25.
Which of the following parts of the human body are sense organs?
I. Tongue
II. Hair
III. Nose
IV. Skin
A.
I and IV only
B.
II and III only
C.
I, II and III only
D.
I, III and IV only
E.
I, II, III and IV
Answer: D
26.
The food we eat undergoes slow oxidation in our bodies to produce heat. In this process
A.
chemical energy is converted to heat energy
B.
electrical energy is converted to heat energy
C.
kinetic energy is converted to heat energy
D.
mechanical energy is converted to heat energy
E.
potential energy is converted to heat energy
Answer: A
27.
Which of the following substances is a non-metal?
A.
Diamond
B.
Mercury
C.
Sodium
D.
Steel
Answer: B
28.
Which of the following devices is made of semiconductor?
A.
Capacitor
B.
Inductor
C.
Resistor
D.
Transistor
Answer: D
29.
Which of the following elements has four electron shells?
A.
19K
B.
13Al
C.
15P
D.
5B
Answer: A
Electronic Configurations
19K = 2, 8, 8, 1
13Al = 2, 8, 3
15P = 2, 8, 5
5B = 2, 3
Only Potassium (19K) has four electron shells
30.
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
31.
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.
32.
The gas produced when dilute hydrochloric acid is added to calcium carbonate is
A.
ammonia.
B.
carbon dioxide.
C.
chlorine.
D.
hydrogen.
E.
oxygen.
Answer: B
Chemical Equation
CaCO3(s) + 2HCl(aq) → CaCl2 (s) + H2O(aq) + CO2(g)
CO2(g) = Carbon dioxide
33.
The transfer of heat through a solid medium is by
I. conduction
II. convection
III. radiation
A.
I only
B.
II only
C.
III only
D.
I and II only
E.
II and III only
Answer: A
Conduction: Transfer of heat through solid medium
Convection: Transfer of heat through fluids (liquids and gases)
Radiation: Transfer of heat through vacuum
34.
Bronze is an alloy of
A.
iron and carbon.
B.
zinc and copper.
C.
iron and zinc.
D.
copper and tin.
Answer: D
Alloy and their compositions
1. Steel → Iron and Carbon
2. Brass → Copper and Zinc
3. Bronze → Copper and Tin
35.
When testing for proteins in a food substance using Fehling's solution, the expected colour change is
A.
blue.
B.
purple.
C.
blue-black.
D.
brick-red.
Answer: D
36.
The process by which gas changes to liquid is known as
A.
melting.
B.
evaporation.
C.
condensation.
D.
boiling.
Answer: C
37.
Gases enter and leave the leaf of a plant through the
A.
mesophyll cells.
B.
stomata.
C.
pith.
D.
palisade cells.
Answer: B
38.
An atom has 5 protons and 5 neutrons in its nucleus. How many electrons are present in the atom?
A.
1
B.
2
C.
5
D.
9
E.
10
Answer: C
In a neutral atom, the number of protons is equal to the number of electrons.
39.
The function of the platelets in the circulatory system of humans is to
A.
Transport oxygen
B.
Transport carbon dioxide
C.
Clot of blood
D.
Defend the blood
Answer: C
40.
Which of these is not a characteristic of all living things?
A.
Transpiration
B.
Growth
C.
Reproduction
D.
Feeding
E.
Respiration
Answer: A
THEORY QUESTIONS
1.
(a)
(i)
Explain vegetative reproduction
(ii)
State two differences between sexual reproduction and vegetative reproduction.
(iii)
Give one advantage of vegetative reproduction.
(b)
(i)
Name suitable solvents for the following substances:
oil paint, fat, common salt, plant pigments.
(ii)
What is the name given to a substance dissolved by a solvent?
(c)
The diagram below represent a simple machine.
(i)
What class of simple machine does it represent?
(ii)
Name the parts labelled I, II and III
(iii)
Give two examples of machines used in everyday life which work on the same principle as the system illustrate above.
(a)
(i)
Vegetative reproduction is the propagation of new individuals of a particular species by means of parts of a parent plant other than (fertilized) seeds.
OR
Vegetative reproduction is a form of reproduction whereby plants reproduce young ones from growing parts or buds of the parent plant.
(ii)
Differences between sexual reproduction and vegetative reproduction
| Sexual Reproduction | Vegetative Reproduction |
| Gives rise to variables (in species) | Give rise to same species/no variation |
| Involves male and female sex cells/gametes or seeds | Involves only one plant/leaves/stem/root |
(iii)
Advantages of vegetative reproduction
1. Results in species of the same characteristics/features
2. Stores enough food reserve for the offspring
3. Growth is more rapid/fast
4. Only one parent is required to produce the offspring/does not require any agent as in pollination
(b)
(i)
| Substance | Solvent |
| Oil paint | Turpentine/Petrol/Kerosene/Thinner |
| Fat | Petrol/Carbon textrachloride |
| Common salt | Water |
| Plant pigment | Alcohol/acetone |
(ii)
Solute
(c)
(i)
Second class lever
(ii)
I → Effort
II → Load
III → Pivot/Fulcrum
(iii)
Examples of second class levers
1. Wheelbarrow
2. Bottle opener
3. Nutcracker
4. Staplers
5. Nail clippers
6. Doors or gates
2.
a)
State one function each of the following parts of the human reproductive system:
i)
Penis;
ii)
Ovary;
iii)
Oviduct;
iv)
Testis;
v)
Uterus;
b)
i)
What is electrical conductor?
ii)
List two substances which are insulators.
c)
State three ways of maintaining soil fertility.
d)
Write word equation for each of the following chemical reactions:
i)
Oxygen and hydrogens;
ii)
Nitrogen and hydrogen;
iii)
Sodium and chlorine.
a)
Functions of the parts of the human reproductive system
i)
Penis
It is used to introduce/discharge sperms into the vagina.
ii)
Ovary
It produces female gametes/sex cells/ova/hormones.
iii)
Oviduct
It is a place where fertilization occurs/passage for the egg released from the ovary to the uterus.
iv)
Testis
Produces sperms/male gametes/sex cells/hormones.
v)
Uterus
Site for implantation/attachment of embryo.
b)
i)
Electrical conductor is any material that will allow electric current through it.
ii)
Insulators
1. Wood
2. Plastic
3. Rubber
4. Mica
5. Porcelain
6. Glass
c)
Ways of maintaining soil fertility
1. Cover cropping
2. Crop rotation
3. Addition of manure/fertilizer/compost
4. Mulching
5. Mixed farming
6. Tillage to improve aeration
7. Bush fallowing
8. Irrigation
9. Alley cropping
d)
Chemical reactions
i)
Oxygen and hydrogens
Hydrogen + Oxygen → Water
OR
Hydrogen + Oxygen → Hydrogen Peroxide
ii)
Nitrogen and hydrogen
Nitrogen + Hydrogen → Ammonia
iii)
Sodium and chlorine
Sodium + Chlorine → Sodium chloride
3.
a)
i)
What is a deficiency disease?
ii)
Give two deficiency diseases and their causes.
b)
i)
State the importance of excretion in living organisms.
ii)
Name two excretory organs of the human body and the substances they excrete.
c)
i)
Explain why gases are more compressible than solids.
ii)
Give two areas where the compressible nature of a gas is applied
d)
A piece of stone is dropped from a height to the ground.
State the energies possessed by the stone
i)
just before it was released from the maximum point;
ii)
midway between the fall;
ii)
just before it hit the ground.
a)
i)
Deficiency disease is a condition/disorder caused by the absence/lack/inadequate supply/inadequate intake of a particular nutrient/food substance.
ii)
Deficiency diseases associated with diet and their causes
| Disease | Cause |
| Rickets | Lack of vitamin D/calcium |
| Kwashiorkor | Lack of protein |
| Goitre | Lack of iodine |
| Night blindness | Lack of vitamin A |
| Scurvy | Lack of vitamin C (ascorbic acid) |
| Beriberi | Lack of vitamin B1 |
| Dermatitis | Lack of vitamin B2 |
| Pellagra | Lack of vitamin B3 |
| Marasmus | Lack of protein and carbohydrates |
| Anaemia | Lack of iron/folic acid |
| Prolonged bleeding | Lack of vitamin K |
| Infertility | Lack of vitamin E |
b)
i)
Importance of excretion in living organisms
1. If metabolic waste substances/products were not removed, they would be injurious/poisonous to the body
2. It removes waste products from the body
ii)
| Excretory organs | Excretory products |
| Skin | Sweat |
| Kidney | Urine |
| Lungs | Carbon dioxide, water vapour |
| Liver | Bile pigments/cholesterol |
c)
i)
Why gases are more compressible than solids
The particles/molecules of gases are far apart whereas in solids they are more compact.
ii)
Areas where the compressible nature of a gas is applied
1. Pumping of lorry tyres/football
2. Putting gas in bottled minerals
3. Blowing of balloons
4. Putting gas in bottles/gas cylinders
d)
i)
Potential energy
ii)
Potential energy and Kinetic energy
ii)
Kinetic energy
4.
(a)
(i)
Name the process by which green plants manufacture their food.
(ii)
State three factors necessary for this process to take place.
(b)
(i)
Mention the device which could be used to carry a heavy body onto a truck.
(ii)
Name four simple levers used in everyday life.
(iii)
Draw a lever and label the pivot, effort and load on it
(c)
(i)
Using any ammonium compound, describe the general preparation of ammonia gas.
(Diagram of apparatus is not required)
(ii)
Write the chemical equation for the preparation
(a)
(i)
The process by which green plants manufacture their food is called photosynthesis
(ii)
Factors necessary for photosynthesis
1. Chlorophyll/green matter in the leaf
2. Sunlight/light
3. Water (H2O)
4. Mineral salts
5. Carbon dioxide/Carbon (IV) oxide/ (CO2)
6. Suitable temperature
(b)
(i)
Devices that could be used to carry a heavy body onto a truck
1. Inclined plane
2. Pulley
3. Crane
4. Lifting magnets/Electromagnet
5. Forklift
(ii)
Simple levers used in everyday life
1. Wheel barrow
2. Can opener
3. A pair of scissors
4. Nutcrackers
5. Forceps
6. Sugar tong
7. Bottle opener
8. Crowbar
9. Claw hammer
10. A pair of pliers
11. Knife
12. Paper cutter
13. A pair of pincers
14. See saw
(iii)
Note: any of the above diagrams represents labelled lever.
(c)
(i)
General preparation of ammonia gas
1. Ammonia gas can be prepared by heating powdered ammonium chloride and sodium hydroxide/calcium hydroxide
2. The ammonia gas produced is dried by passing it through calcium oxide
(ii)
Chemical equation for the preparation of ammonia gas
NH4Cl + NaOH → NaCl + H2O + NH3
OR
2NH4Cl + Ca(OH)2 → CaCl2 + 2H2O + 2NH3
5.
(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 | ||
6.
a)
i)
What is an alloy?
ii)
State two causes of corrosion of metals.
b)
i)
What is a planet?
ii)
Name two planets between the Sun and the Earth.
c)
State four functions of the circulatory system in humans.
d)
i)
Define the term crop rotation.
ii)
Give one example of a chemical method of controlling pests on crop farms.
a)
i)
An alloy is a uniform mixture of a metal and another metal or non-metal or two or more metals.
OR
An alloy is a homogeneous mixture of a metal and a non-metal.
ii)
Causes of corrosion (rusting) of metals
1. Presence of oxygen or air
2. Presence of moisture or water
3. Presence of alkali
4. Presence of salt
5. Presence of acid
b)
i)
Planet is a heavenly body that moves around the sun or star.
ii)
Planets between the sun and the earth
Mercury and Venus
c)
Functions of the circulatory system
1. Transports blood
2. Transports hormones or drugs or chemical
3. Transports oxygen to cells or tissues or organs of the body
4. Transports nutrients or glucose to organs
5. Carries away excretory products or Carbon dioxide (CO2) or waste material or urea
6. Regulates body temperatures or transports heat
7. Consists of or transports white blood cells or antibodies or attack foreign bodies
8. Transports blood platelets to clot blood
9. Responsible for pumping blood or erection of penis or clitoris
d)
i)
Crop rotation is a system of farming where different types of crops are grown on the same piece of land but on different plots in a definite order or cycle or sequence from season to season.
ii)
Examples of chemical method of controlling pest
1. Spraying of recommended or appropriate pesticides
2. Placement of recommended or appropriate pesticides