KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Which of the following examples of fertilizers improves soil texture?
A.
Compost
B.
N.P.K.
C.
Sulphate of ammonia
D.
Urea
Answer: A
2.
The most effective method of controlling soil erosion on steep slopes is
A.
cover cropping.
B.
mulching.
C.
strip cropping.
D.
terracing.
Answer: D
3.
Liquids suitable for use in thermometers must not:
A.
wet glass
B.
have a low boiling point
C.
have a high melting point
D.
have a high density
E.
expand
Answer: A
4.
The digestion of carbohydrates starts in the
A.
mouth
B.
throat
C.
stomach
D.
duodenum
E.
ileum
Answer: A
5.
The chemical symbol of potassium is
A.
Na.
B.
K.
C.
Pb.
D.
S.
Answer: B
6.
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
7.
The element with the chemical symbol S is
A.
silicon
B.
silver
C.
sodium
D.
Sulphur
Answer: D
8.
What type of energy is lost when sweat evaporates from the body?
A.
light energy
B.
mechanical energy
C.
chemical energy
D.
Heat energy
E.
Electrical energy
Answer: D
9.
Which of the following devices converts electrical energy into sound energy?
A.
Electric heater
B.
Electric fan
C.
Washing machine
D.
Loudspeaker
Answer: D
10.
The end-product of digestion of fats and oils is
A.
amino acid
B.
glucose
C.
maltose
D.
fatty acid and glycerol
Answer: D
The digestion of certain fats begins in the mouth, where lingual lipase breaks down short chain lipids into diglycerides. The presence of fat in the small intestine produces hormones that stimulate the release of pancreatic lipase from the pancreas, and bile from the liver, to enable the breakdown of fats into fatty acids. The complete digestion of one molecule of fat (a triglyceride) results in three fatty acid molecules and one glycerol molecule.
11.
Which of the following processes is used to separate insoluble solids from liquids?
A.
Crystallization
B.
Evaporation
C.
Filtration
D.
Sublimation
Answer: C
12.
Power is defined as the rate at which
A.
energy is used.
B.
temperature rises.
C.
a body travels.
D.
a body cools down.
Answer: A
Power =
13.
Which of the following pairs of structures form part of the female reproductive system of humans?
A.
Urethra and uterus
B.
Cervix and uterus
C.
Ureter and uterus
D.
Cervix and ureter
Answer: B
14.
Useful materials in food that provide growth and repair of worn out tissues are called
A.
carbohydrates.
B.
vitamins.
C.
proteins.
D.
fats.
Answer: C
15.
All of the following promote Primary Health except
A.
keeping the surroundings clean
B.
effective disposal of waste
C.
personal hygiene
D.
balanced diet
E.
bleaching the skin
Answer: E
16.
Which of the following soil type has the highest capillarity?
A.
Clay
B.
Loam
C.
Sand
D.
Silt
Answer: A
One of the problems with clay soil is its slow permeability resulting in a very large water-holding capacity. Because the soil particles are small and close together, it takes water much longer to move through clay soil than it does with other soil types. Clay particles then absorb this water, expanding as they do so and further slowing the flow of water through the soil. This not only prevents water from penetrating deep into the soil but can also damage plant roots as the soil particles expand.
17.
According to the principle of conservation of energy, ‘energy can
A.
be created and destroyed
B.
be created but not destroyed
C.
be destroyed but not created
D.
be reduced but not increased
E.
neither be created nor destroyed
Answer: E
18.
The process by which water vapour moves through the stomata of leaves into the atmosphere is known as
A.
absorption.
B.
diffusion.
C.
osmosis.
D.
transpiration.
Answer: D
19.
Which of the following is true about a first class lever?
A.
The load is between the effort and the pivot
B.
The pivot is between the effort and the load
C.
The effort is between the pivot and the load
D.
The load is on the pivot
E.
There is no pivot
Answer: B
20.
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.
21.
The type of management system which allows farm animals to roam about freely is known as
A.
extensive system.
B.
intensive system.
C.
semi-extensive system.
D.
semi-intensive system.
Answer: A
22.
An atom which contains more electrons than protons becomes a
A.
positive ion.
B.
negative ion.
C.
neutral atom.
D.
binary compound.
Answer: B
In a neutral atom, the number of protons balances that of electrons. Protons are positively charged and the electrons are negatively charged. When an atom gains more electrons, the negative charge becomes higher than the positive charge, hence the atom becomes a negative ion (Anion).
23.
In which part of the alimentary canal is food finally changed into a form that can be absorbed into the bloodstream?
A.
small intestines
B.
oesophagus
C.
mouth
D.
stomach
E.
large intestines
Answer: A
24.
Which of the following substances is a mixture?
A.
Water
B.
Sodium chloride
C.
Sodium chloride solution
D.
Iron filing
Answer: C
25.
Which of the following organs are used for excretion?
I. Lung
II. Skin
III. Kidney
IV. Heart
A.
I and IV only
B.
II and III only
C.
III and IV only
D.
I, II and III only
Answer: D
26.
The type of soil which become water-logged after rainfall is made up of a large amount of
A.
silt.
B.
sand.
C.
gravel.
D.
clay.
Answer: D
27.
The portion of air which is used in burning is
A.
nitrogen
B.
water vapour
C.
oxygen
D.
carbon dioxide
E.
inert gas
Answer: C
28.
Which of the following activities of man causes both air and water pollution?
A.
Afforestation
B.
Construction of houses
C.
Construction of roads
D.
Deforestation
E.
Industrialization
Answer: E
29.
The work done when a force moves a body through a distance of 12 m is 720 J. The force applied is
A.
8640 N.
B.
732 N.
C.
708 N.
D.
60 N.
Answer: D
30.
Which of the following are products of respiration?
A.
Glucose and oxygen
B.
Waste food, energy and carbon dioxide
C.
Energy, carbon dioxide and water
D.
Energy, oxygen and water
E.
Carbon dioxide and oxygen
Answer: C
C6H12O6 + 6O2 → 6CO2 + 6H2O (glucose + oxygen -> carbon dioxide + water + energy)
31.
Which of the following statement(s) about pressure in fluids is/are correct? Pressure
I. decreases with depth
II. increases with depth
III. does not depend on the area
A.
I only
B.
II only
C.
I and II only
D.
II and III only
Answer: B
The pressure in a liquid is different at different depths. Pressure increases as the depth increases. The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions. For example, the pressure acting on a dam at the bottom of a reservoir is greater than the pressure acting near the top. This is why dam walls are usually wedge-shaped. The greater pressure at the bottom would give a greater ‘force per unit area’ on the wall.
32.
Ringworm is a skin disease, which is caused by
A.
bacteria.
B.
fungi.
C.
insects.
D.
worm.
Answer: B
33.
Which of the following elements is a macro-nutrient?
A.
Copper
B.
Manganese
C.
Zinc
D.
Sulphur
Answer: D
Nutrients that plants require in larger amounts are called macronutrients. About half of the essential elements are considered macronutrients: carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, and sulphur.
34.
Iodine deficiency in humans could result in a disorder known as
A.
diabetes.
B.
goitre.
C.
kwashiorkor.
D.
scurvy.
Answer: B
35.
The structure which helps a fish to breath under water is the
A.
gill.
B.
air sac.
C.
operculum.
D.
mouth.
Answer: A
36.
The conversion of agricultural produce from its original form to other desirable forms is termed
A.
preservation.
B.
processing.
C.
recycling.
D.
storage.
Answer: B
37.
The main waste products formed in plants are
A.
water, carbon dioxide and urea
B.
water, carbon dioxide and oxygen
C.
water, carbon dioxide and mineral salts
D.
water, ammonium compounds and oxygen
E.
water, ammonium compounds and carbon dioxide
Answer: D
38.
The characteristics that distinguishes living things from non-living things is that, living things
A.
are able to move, non-living things are not.
B.
are of different sizes, non-living things have same size.
C.
can manufacture their own food, non-living things cannot.
D.
have a definite form, non-living things have irregular forms.
Answer: A
39.
Which of the following is the organic part of the soil?
A.
Mineral salts
B.
Water
C.
Rock particles
D.
Air
E.
Humus
Answer: E
40.
The heat of the sun reaches the earth through
A.
radiation
B.
convection
C.
conduction
D.
both radiation and conduction
E.
both radiation and convection
Answer: A
THEORY QUESTIONS
1.
a)
State three functions of the female reproductive system in humans
b)
i)
What is the role of a capacitor in a circuit.
ii)
Give two examples of a compound machine
c)
i)
What is Integrated Pest Management?
ii)
State two advantages of practicing integrated pest management.
d)
i)
State two classes of mixtures.
ii)
Classify each of the following substances under the classes stated in (i)
(α) bronze;
(β) when perfume is sprayed into the air.
a)
Functions of the female reproductive system in humans
1. Produces female sex cells/eggs/ova
2. Produces the female hormones
3. Houses the embryo
4. Site for fertilization of eggs
5. Site for implantation of fertilized eggs/zygote
b)
i)
Roles of capacity in a circuit
1. Used to maintain a power supply when the device is unplunged and without a battery for a short time
2. Store electric energy/charges when they are connected to a charging circuit
3. To smooth current fluctuation for signal/control circuit
ii)
Examples of a compound/complex machine
1. Sewing machine
2. Mower
3. Tractor
4. Car
5. Mist blower
c)
i)
Integrated Pest Management
It involves the combination of all known methods of pest control to check pests
OR
Is a combination of biological chemical, cultural and physical methods to combat pests
ii)
Advantages of Integrated Pest Management
1. Less toxic residues in crops or food
2. Less expensive or easier or faster
3. More effective or destroy pests easier or faster
4. Less harmful to the environment
d)
i)
Classes of mixtures (I)
Homogenous and heterogenous
Classes of mixtures (II)
Solution, suspension and colloid
Classes of mixtures (III)
Solid - Solid, Solid - Liquid, Liquid - Liquid and Liquid - Gas
ii)
α) Bronze → Homogenous or Solution or Solid - Solid
β) Perfume sprayed into the air → Heterogenous or Suspension or Liquid - Gas
2.
(a)
(i)
Define Pressure
(ii)
Explain why it is important to sharpen a knife before use.
(b)
(i)
State two differences between metals and non-metals.
(ii)
What is an alloy?
(ii)
Mention the components of each of the following alloys:
(α)
steel;
(β)
brass.
(c)
Mention three conditions suitable for rearing tilapia in a fishpond.
(d)
Explain how the streamlined body of a bony fish enables it to live successfully in water.
(a)
(i)
Pressure is defined as force per unit area applied in a direction perpendicular/normal to the surface of the object.
OR
Pressure =
(ii)
Why it is important to sharpen a knife before use
When a knife is sharpened, the cutting edge becomes smaller so that with a little force applied, a larger pressure is exerted for cutting to be easier.
(b)
(i)
Differences between metals and non-metals
| # | 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 |
(ii)
An alloy is a uniform/homogeneous mixture of a metal and another metal or a non-metal.
(ii)
Components of alloys
(α)
steel → carbon and iron
(β)
brass → copper and zinc
(c)
Conditions suitable for rearing tilapia in a fishpond
1. Presence of dissolved oxygen
2. Ideal/suitable/favourable pH
3. Suitable temperature
4. Suitable salt concentration/salinity
5. Suitable depth of water/pond depth
6. Non-polluted/non-contaminated/clean water
(d)
The streamlined body of a bony fish enables it to move freely to cut its way through water easily with least resistance from water molecules.
3.
(a)
State four ways by which plants are able to protect themselves against animals.
(b)
(i)
Define pollination.
(ii)
List four features of insect pollinated flowers.
(c)
An atom has three protons and three neutrons.
(i)
How many electrons are there in this atom?
(ii)
Draw a labeled diagram to show the arrangement of all the particles in the atom.
(d)
A body of mass 12.0 kg is placed on an orange tree 20.0 m above the ground
(i)
Calculate its potential energy with respect to the ground
(ii)
If the body is released from this height, what will be its kinetic energy just before it hits the ground.
[g = 10 ms-2]
(a)
Ways by which plants protect themselves against animals
1. Secretion of unpleasant liquids which make them distasteful
2. Possession of poisonous parts which cause pain/itching/death/swelling on contact
3. Possession of spines/thorns/irritating hairs which cause pain/irritation on contact
4. Possession of sticky substances which stick in the mouth of animals which try to feed on them
5. Possession/production of unpleasant smell/scent which drives off animals which try to feed on them
(b)
(i)
Pollination is the transfer of pollen grains from the anther of a flower to the stigma of the flower or another flower of the same species.
(ii)
Features of insect pollinated flowers
1. Petals are large
2. Petals are brightly coloured
3. The flower is usually scented
4. The flower has nectar
5. Stigma is inside the flower
6. Stigma is compact and sticky
7. Pollen grains produced per anther are few
8. Pollen grains are sticky, large, rough and heavy
9. Filaments are short and stout
(c)
(i)
Number of protons = 3
Number of neutrons = 3
Number of electrons = Number of protons
Number of electrons = 3
(ii)
(d)
(i)
Potential energy = Mass (m) x Acceleration due to gravity (g) x Height (h)
Mass = 12.0 kg
Acceleration due to gravity (g) = 10 ms-2
Height = 20 m
Potential energy = 12.0 kg x 10 ms-2 x 20 m
Potential energy = 2400 J
(ii)
Before the body just hit the ground, the potential energy is converted to kinetic energy
∴ Kinetic energy = Potential energy
Kinetic energy = 2400 J
4.
a)
i)
Distinguish between a rhizome and a stem tuber.
ii)
Give one example each of a rhizome and a stem tuber.
b)
State the method which could be use to separate each of the following mixtures and explain your answer in each case:
i)
salt and water;
ii)
sawdust and iron filings;
ii)
powdered charcoal and water.
c)
i)
Define density of a substance.
ii)
Explain how a body which sinks in water could be made to float.
a)
i)
Differences between a rhizome and a stem tuber
| Rhizome | Stem Tuber |
| Creeps horizontally below soil surface | Usually sits/vertically below soil surface |
| Scaly leaves around buds | No scaly leaves around buds |
| Has internodes and nodes | Has only nodes |
| Has both lateral and terminal buds | Has only terminal buds |
ii)
Examples of a rhizome and a stem tuber
Rhizome: Ginger, Canna Lily, Fern, Elephant grass, Tiger nuts
Stem tuber: Yam, Irish potato/potato
b)
| # | Mixture | Method of separation | Explanation |
| i) | Salt and water |
Evaporation OR Crystallization OR Distillation |
Water evaporates OR Salt crystallizes out of the saturated solution OR Water distils off |
| ii) | Sawdust and iron filings | Use of magnet | Iron filings are attracted by a magnet |
| iii) | Powdered charcoal and water |
Filtration OR Decantation |
Charcoal particles are larger than water molecules/cannot pass through filter paper OR Charcoal settles after a long time and water is carefully poured off and charcoal dried |
c)
i)
Density is defined as mass per unit volume of a substance
OR
Density =
ii)
How to make a body which sinks in water float
1. Make the body hollow/shape body into a bowl
2. Decrease the density of the body to lower than the density of water by increasing the volume of the body
5.
a)
Name four weather measuring instruments.
b)
Name the stages in the life cycle of a mosquito.
c)
i)
List two properties of water.
ii)
Explain why it is advisable to wash clothes with soft water.
d)
State three ways in which soil profile is important.
a)
Weather measuring instruments
1. Rain gauge
2. Thermometer
3. Wine vane
4. Anemometer
5. Barometer
6. Hygrometer
7. Sun dial
8. Sunshine recorder
9. Weather satellite
b)
Stages in the life cycle of a mosquito
1. Eggs
2. Larvae/Larva
3. Pupa/pupae
4. Imago
c)
i)
Properties of water
1. Made up of hydrogen and oxygen
2. Tasteless/insipid
3. Odourless
4. Boils at 100oC
5. Density: 1,000 kg/m3 or 1g/cm3
6. Colourless
7. Freezes at 0oC
8. A universal solvent
9. Neutral/pH 7
10. Exist as solid/liquid/gas
11. Polar
12. Expands anomalously/irregularly
ii)
Why clothes are washed with soft water
1. Use less soap
2. Clothes remain soft
3. Will be able to completely rinse the soap out of the clothes
4. Clothes keep their colour/brightness
d)
Importance of soil profile
1. It helps to get insight into soil fertility
2. It determines the suitability for agriculture production
3. It helps to select good soil for the crop
4. It determines depth at which tillage implements must be set or type of tool to use
5. To know soil management practices to adopt
6. It helps to determine type of crop to grow
7. It determines type of structure to be built
6.
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