KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Which of the following diseases is not a deficiency diseases?
A.
Scurvy
B.
Cholera
C.
Beriberi
D.
Goiter
Answer: B
Cholera: is an acute diarrheal illness caused by infection of the intestine with Vibrio cholerae bacteria.
Deficiency Diseases
Deficiency diseases are diseases that are caused by the lack of certain essential nutrients in one's diet over a prolonged period of time.
| Nutrient | Disease |
| Vitamin A (Retinol) | Night blindness |
| Vitamin B1 (Thiamine) | Beri-beri |
| Vitamin B2 (Riboflavin) | Retarded growth, bad skin |
| Vitamin B12 (Cyanocobalamin) | Anaemia |
| Vitamin C (Ascorbic acid) | Scurvy |
| Vitamin D (Calciferol) | Rickets |
| Vitamin K (Phylloquinone) | Excessive bleeding due to injury |
| Calcium | Brittle bones, excessive bleeding |
| Phosphorus | Bad teeth and bones |
| Iron | Anaemia |
| Iodine | Goitre, enlarged thyroid gland |
| Copper | Low appetite, retarded growth |
2.
The basic unit of life is the
A.
cell.
B.
nucleus.
C.
organ.
D.
tissue.
Answer: A
3.
Which of the following farming practices promote soil erosion
I. Alley cropping
II. Bush burning
III. Over grazing
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: C
- Alley cropping is a specific practice in which trees or shrubs and agricultural crops are grown in alternate rows The trees are commonly pruned to limit the shading of the agricultural crop. Alley cropping can also contribute to nutrient cycling and erosion control.
- Bush burning is the removal of the natural vegetation cover that protects the soil surface through the use of fire. This exposes the land to the effect of wind, soil erosion ,water erosion and ultraviolet radiation.
- Overgrazing is grazing by livestock or wildlife to the point where the grass cover is depleted, leaving bare, unprotected patches of soil. As a result, water and wind cause erosion, especially on clay soils, and the growth of poisonous plants and thorny shrubs may increase.
Therefore Bush burning and Overgrazing promote soil erosion.
4.
The work done by force of 20 N on a body is 60 J. Calculate the distance through which the force moved
A.
8.0 m
B.
4.0 m
C.
3.0 m
D.
2.0 m
Answer: C
Work done = Force x Distance
Distance =
Work done = 60 J
Force = 20 N
Distance = = 3 m
5.
Cultural practices are activities undertaken on a farm
A.
after harvesting and before processing.
B.
before maturity and after harvesting.
C.
after planting and before harvesting.
D.
before transplanting seedling.
Answer: C
6.
The diagram below shows a lever system used to move a stone. Use it to answer the question below
Less effort is required to move the stone when the
A.
distance Y is equal to X.
B.
distance Y is greater than X.
C.
distance Y is less than X.
D.
stone is at the pivot.
Answer: B
Mechanical Advantage =
Load Distance: is the distance between the pivot (fulcrum) and the load
Effort Distance: Is the distance between the pivot (fulcrum) and the effort
Since the effort distance (Y) is the numerator in the mechanical advantage formula, the greater it is than the load distance (X), the greater the mechanical advantage and the better the efficiency of the machine/lever.
7.
One of the properties of acids is that they
A.
turn wet blue litmus paper red.
B.
have no effect on blue litmus paper.
C.
turn wet red litmus paper blue.
D.
are neutral to litmus paper.
Answer: A
Testing for acid
Blue litmus paper will turn red in acid solutions and red litmus blue in base solutions.
8.
The chemical symbol for potassium is
A.
Fe
B.
K
C.
P
D.
Pb
E.
Zn
Answer: B
9.
Which of the following structures is not involved in blood circulation?
A.
Capillary
B.
Heart
C.
Muscle
D.
vein
Answer: C
10.
Calcium oxide and water reacts to form calcium hydroxide. The formula for the product is
A.
Ca2OH
B.
Ca(OH)2
C.
CaH2O
D.
Ca(H2O)2
Answer: B
CaO + H2O → Ca(OH)2
11.
The weight of an object is the
A.
force with which the sun pulls it
B.
force with which the moon pulls it
C.
force of the object when gravity is not acting on it
D.
force with which gravity acts on it
E.
mass of the object
Answer: D
12.
One disease that affects the nervous system of humans is
A.
filariasis.
B.
measles.
C.
poliomyelitis.
D.
typhoid
Answer: C
Poliomyelitis (Polio) is a highly infectious disease caused by a virus. It invades the nervous system and can cause total paralysis in a matter of hours.
13.
The disease caused by the Plasmodium parasite is
A.
Cholera.
B.
malaria.
C.
onchocerciasis.
D.
schistosomiasis.
Answer: B
14.
The part of the plant which is found in the soil is the
A.
flower
B.
stem
C.
leaf
D.
root
E.
fruit
Answer: D
15.
Which of the following feature of a parent would not be inherited by the children?
A.
Colour of eye
B.
Shape of nose
C.
Height
D.
Scar
Answer: D
16.
Droplet infection is the method by which
A.
disease are transmitted from animals to plants.
B.
infected animals are processed.
C.
human beings protects themselves from diseases.
D.
diseases are spread through the air.
Answer: D
17.
Chlorine gas is an example of
A.
an atom.
B.
an element.
C.
a compound.
D.
a molecule.
Answer: D
18.
Which of the following diseases may be associated with water?
A.
Chicken pox
B.
Cholera
C.
Small pox
D.
Tetanus
Answer: B
19.
The majority charge carriers is a p-type semi-conductor are
A.
electrons.
B.
holes.
C.
neutrons.
D.
protons.
Answer: C
20.
Which of the following gases is involved in the process of rusting?
A.
H2
B.
Co2
C.
O2
D.
N2
Answer: C
The conditions necessary for rusting are water (moisture) and oxygen.
21.
Which of the following substances is a compound?
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Sulphur
E.
Water
Answer: E
Compounds are made up of two or more different elements. All the options except water are elements/atoms.
The chemical formula of water is H2O which is made up of hydrogen and oxygen atoms (Two different elements).
22.
A fish is able to swim with little resistance in water because it has
A.
fins.
B.
gills.
C.
a streamlined body.
D.
the ability to make use of a limited oxygen supply.
Answer: C
Adaptations of fish
1. They have a streamlined body shape to help reduce water resistance
2. Fishes have gills to respire underwater
3. Fishes have scales and mucous on their bodies to make them waterproof and reduce water resistance while swimming
23.
The efficiency of a machine is given by the ratio
A.
B.
C.
D.
E.
Answer: E
24.
Micro-organisms that cause disease are collectively called
A.
bacteria.
B.
infections.
C.
pathogens.
D.
viruses.
Answer: C
25.
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
26.
Photosynthesis in plants requires chlorophyll, sunlight, water and
A.
oxygen
B.
carbon dioxide
C.
steam
D.
hydrogen
E.
nitrogen
Answer: B
27.
The organ that removes metabolic wastes from the human body is
A.
anus.
B.
heart.
C.
kidney.
D.
rectum.
E.
spleen.
Answer: C
The kidneys' primary function is to filter blood. They also remove waste and balance the body's fluids.
28.
In a pin-hole camera, when the size of the pin-hole is increased, the image formed is
A.
blurred.
B.
erect.
C.
magnified.
D.
virtual.
Answer: A
29.
One characteristics of the image formed in a pin-hole camera is that the image is
A.
diminished.
B.
magnified.
C.
upright.
D.
virtual.
Answer: A
Characteristics of image formed in a pin-hole camera
1. The image formed is real hence it can be formed on the screen
2. It is inverted
3. It is generally smaller than the size of the object
30.
The main pollutant from domestic fires is
A.
carbon monoxide.
B.
sulphur dioxide.
C.
water vapour.
D.
oxygen.
E.
ammonia
Answer: A
31.
A balanced diet is one which is made up of
A.
right proportions of protein, carbohydrates and oils.
B.
equal amounts of protein, carbohydrates and oil.
C.
enough water and iodated salt.
D.
vegetables, fruits and water.
Answer: A
32.
The second stage in the life cycle of a mosquito is the
A.
egg
B.
imago
C.
larva
D.
pupa
Answer: C
33.
An electrical engineer was in your school to replace a 20 W bulb with a 50 W bulb.
Use this information to answer the question below
The unit inscribed on the bulb measures its
A.
energy.
B.
workdone.
C.
power.
D.
electricity.
Answer: C
Note: the S.I unit of power is watts (W)
34.
The paired fins in fishes are used for
A.
protection and diving
B.
diving and balancing
C.
balancing and control
D.
steering and diving
E.
balancing and steering
Answer: E
35.
The chemical formula of a compound describes the
A.
ratio in which the elements are combined.
B.
number of molecules in a compound.
C.
nature of the bonding in the compound.
D.
state of matter of the compound.
Answer: A
36.
Which of the following statements about acids are correct?
I. They turn red litmus paper blue.
II. They can be neutralized by bases.
III. Citrus fruits contains acids.
A.
I and II only
B.
II and III only
C.
I and III only
D.
I, II and III
Answer: B
Acids turn blue litmus paper red and not the other way round. Statement I is false.
Remember the acronym when you are confused. BAR. B for blue and A for acid and R for red. BAR acronym simply means for Acids (A), Blue litmus paper turns Red.
37.
A torch light bulb lights up when connected to a dry cell. What type of energy is obtained from the cell?
A.
Chemical energy
B.
Light energy
C.
Potential energy
D.
Electrical energy
E.
Heat energy
Answer: D
38.
Oxygen is made available to all cells of the human body by the
A.
plasma.
B.
platelets.
C.
white blood cells.
D.
red blood cells.
Answer: D
39.
The process used to separate a mixture of iron filings and sulphur is
A.
magnetic attraction
B.
sublimation
C.
distillation
D.
evaporation
Answer: A
By magnetization we can separate sulfur and iron fillings. Take a magnet near to the mixture it will attract iron fillings and the remaining thing will be sulfur.
40.
The by-products of respiration are
A.
carbon dioxide and heat
B.
carbon dioxide and water
C.
oxygen and heat
D.
oxygen and water
Answer: B
THEORY QUESTIONS
1.
a)
Write the systematic name for each of the following compounds.
i)
H2O;
ii)
MgO;
iii)
CaO;
iv)
CaCl2.
b)
Name the instrument used in measuring the following:
i)
Length of a rope;
ii)
Mass of a stone;
iii)
Temperature of a liquid;
iv)
Volume of a liquid.
c)
List three factors that influence vegetable crop production.
d)
Name four stages in the cycle of a flowering plant.
a)
Systematic names
i)
H2O → Water/dihydrogen monoxide/hydrogen oxide
ii)
MgO → Magnesium oxide
iii)
CaCO → Calcium oxide
iv)
CaCl2 → Calcium chloride
b)
Measuring instruments
i)
Length of a rope → Metre rule/tape measure/ruler/surveyor's tape
ii)
Mass of a stone → Beam balance/chemical balance/top pan balance/electronic balance
iii)
Temperature of a liquid → Thermometer
iv)
Volume of a liquid → Volumetric flask/pipette/graduated cylinder/measuring cylinder/burette/graduated beaker
c)
Factors that influence vegetable crop production
1. Slope of land/topography
2. Water/water supply or quality
3. Crop/variety selection
4. Market development
5. Soil type/quality/fertile soil
6. Method of propagation
7. Cultural practices(or any named cultural practice)
8. Harvesting
9. Weather conditions
10. Storage
11. Disease (control)
12. Processing
d)
Stages in the cycle of a flowering plant
1. Seed/fruit formation
2. Germination
3. Reproduction
4. Pollination
5. Seed spreading/dispersal
6. Flowering
7. Fertilization
8. Maturation of fruit or Seed
9. Seedling
10. Growth/maturation/matured plant
2.
a)
i)
State two differences between an ecosystem and a habitat.
ii)
What is meant by the term blood?
b)
Explain why it is difficult to separate iron and sulphur mixture after strong heating.
c)
Draw and label a diagram of a ray of light which makes an angle of 350 with the surface of a plane mirror.
d)
State two
i)
advantages of a land rotation.
ii)
disadvantages of land rotation.
a)
i)
| Ecosystem | Habitat |
| Larger | Smaller |
| Larger number of species | Smaller number of species |
| Involves different species | Involves a specific species |
ii)
Blood is a body fluid that transports oxygen and nutrients to the cells and carries away carbon dioxide and other waste products.
b)
Reasons why iron and suphur cannot be separated when heated
After heating, a chemical change occurs and the two substances are chemically combined (compound formed) and no longer a mixture
c)
Angle of incidence = Angle of reflection
Angle of incidence + 35o = 90o
Angle of incidence = 90o - 35o
Angle of incidence = 55o
Since angle of incidence = Angle of reflection
Angle of reflection = 55o
d)
i)
Advantages of land rotation
1. It helps check the spread of diseases
2. Land regains lost nutrients after the fallow period
3. Checks spread of pests
ii)
Disadvantages of land rotation
1. Does not encourage large scale farming
2. Virgin forest is destroyed
3. Needs a lot of time and work/ not easy to practice
4. Land is not fully utilized
5. Not suitable for areas where land is scarce
6. Encourages soil erosion
3.
(a)
(i)
Name the two elements that combine to form water.
(ii)
Write a balanced chemical equation to show how the water is formed from the named elements.
(b)
State two ways of maintaining a balance in an ecosystem.
(c)
(i)
What is a fertile soil?
(ii)
State two factors that cause loss of soil fertility.
(d)
Classify the following items as magnetic or non-magnetic substance: wood, steel blade, rubber and glass jar.
(a)
(i)
Elements that combine to form water
1. Hydrogen
2. Oxygen
(ii)
2H2 + O2 → 2H2O
OR
H2 + O2 → H2O
(b)
Ways of maintaining a balance in an ecosystem
1. Avoid overgrazing
2. Pollution of environment must be avoided
3. Avoid deforestation or re-planting of trees/aforestation
4. Indiscriminate hunting of animals should be avoided
5. Farmers should be educated and closely monitored on the use of agro-chemicals
6. Fishermen should use right fishing net for fishing
7. Encroaching on wetlands or forests by people should be avoided
8. Mining activities should be modernized to avoid destruction habitat for organisms
9. Avoid bush burning
(c)
(i)
Fertile soil is a soil that has essential nutrients to support the growth/development of crops.
OR
Fertile soil is a soil that has an abundance of plant nutrients/minerals orgamic matter to support plant growth.
OR
Fertile soil is a soil which contains all the major nutrients for basic plant nutrition as well as others to support plant growth.
OR
Fertile soil is a soil which is able to provide all essential plant nutrients in available forms and in a suitable balance to support plant growth.
(ii)
Factors that cause loss of soil fertility
1. Soil erosion
2. Leaching
3. Bush burning
4. Continuous cropping or monoculture
5. Deforestation
6. Overgrazing
7. Illegal mining
8. Soil acidification/salinization/alkanization
9. Inefficient soil management practices
10. Soil pollution/indiscriminate use of agro-chemicals
(d)
Classification of items as magnetic or non-magnetic substance
Wood → Non-magnetic
Steel blade → Magnetic
Rubber → Non-magnetic
Glass jar → Non-magnetic
4.
(a)
A sample of garden soil is put in a cylinder containing water. It is shaken and allowed to settle.
Draw and label the layers formed.
(b)
(i)
Name four types of forces.
(ii)
A boy used a catapult to pluck a mango from a tree. State two forces involved in this activity.
(iii)
Where are the forces in (b) (ii) applied?
(c)
Describe an experiment to show that there is change in heat energy when a new substance is formed.
(a)
(b)
(i)
Types of forces
1. Force of gravity
2. Weight
3. Magnetic force
4. Electrostatic force
5. Frictional force
6. Centripetal force
7. Viscous force
8. Tensional/Elastic force
9. Adhesion
10. Cohesion
11. Centrifugal force
(ii)
1. Tensional/Elastic force
2. Force of gravity
3. Frictional force
(iii)
1. Tension/elastic force in the rubber band of the catapult pushed the stone
2. Force of gravity brought down the mango
3. Frictional force acts between the stone and the mango/between the leather of the catapult and the stone/between the palm and the stick of the catapult
(c)
Experiment to show that there is change in heat energy when a new substance is formed
1. Take two solutions/substances such as lead nitrate/lead (II) trioxonitrate (V) and dilute hydrochloric acid
2. Measure the temperature of the separate solutions and record
3. Pour the acid into the nitrate
4. Measure the temperature as you stir gently
5. It will be observed that a new substance is formed with a change in temperature
6. It can therefore be concluded that there is a change in heat energy when a new substance is formed
5.
(a)
(i)
Give two differences between a vein and an artery.
(ii)
State two functions of red blood cells.
(iii)
Mention two diseases associated with the circulatory system.
(b)
(i)
Classify the following processes into a physical change and a chemical change:
Cooking of food;
Melting of candle;
Melting of ice;
Rusting of iron;
Dissolution of sugar in water;
Burning of wood into ash.
(ii)
Explain the basis of the classification in (b)(i).
(c)
(i)
State the laws of reflection.
(ii)
Draw a ray diagram of light incident at an angle of 40o on the surface of a plane mirror.
(a)
(i)
Differences between a vein and an artery
| Vein | Artery |
| Located close to the surface of the skin | Located deep in the muscles |
| Thin walled | Thick walled |
| Presence of valves | Absence of valves |
| Smaller in size | Bigger in size |
| Blood flows under low pressure/blood flows smoothly | Blood flows under high pressure/flows in pulses |
| Carries blood to the heart | Carries blood away from the heart |
| Carries blood with low oxygen/carries de-oxygenated blood | Carries blood with high oxygen/carries oxygenated blood |
| Has bigger lumen | Has smaller lumen |
| Less elastic wall | More elastic wall |
(ii)
Functions of red blood cells
1. They carry oxygen from lungs to cells
2. They carry carbon dioxide from the cells to lungs
(iii)
Diseases associated with the circulatory system
1. High blood pressure (Hypertension)
2. Low blood pressure (Hypotension)
3. Varicose veins
4. Piles/Haemorrhages
5. Anaemia
6. Leukaemia/blood cancer
7. Arteriosclerosis
8. AIDS
9. Hepatitis
10. Heart failure/Cardiac arrest
11. Sickle cell anaemia
12. Diabetes
13. Stroke
14. Haemophilia
15. Coronary artery disease/Thrombosis
16. Malaria
(b)
(i)
| Physical Change | Chemical Change |
| Melting of candle | Cooking of food |
| Melting of ice | Rusting of iron |
| Dissolution of sugar in water | Burning of wood into ash |
(ii)
Physical and chemical changes
For a physical change,
1. The original substance can be obtained by a reverse process
2. There is no new substance formed
3. No change in mass occurs
4. The individual components retain their properties
5. There is no heat involved
For a chemical change,
1. The original substance cannot be obtained by reversing the process
2. New substances are formed
3. Change in mass occurs
4. Individual components lose their properties
5. There is heat involved
(c)
(i)
Laws of reflection
1. The angle of incidence is equal to the angle of reflection
2. The incident ray, reflected ray and the normal at the point of incidence all lie in the same plane
(ii)
6.
(a)
State three differences between metals and non-metals in terms of their physical properties.
(b)
(i)
Explain the term active region as applied to transistors;
(ii)
State what happens in the active region of a transistor.
(c)
(i)
State two effects of lack of protein in the diet of humans.
(ii)
Describe briefly the chemical test for glucose.
(d)
(i)
What are soil resources?
(ii)
State two agricultural activities which make the soil lose its nutrients.
(a)
Differences between metals and non-metals
| Metals | Non-metals |
| Good conductor of heat | Poor conductor of heat |
| Conducts electricity | Does not conduct electricity/poor conductor |
| Lustrous | Dull |
| Malleable | Non-malleable |
| Ductile | Brittle |
| High density | Low density |
| High melting point | Low melting point |
| Generally hard | Generally soft |
(b)
(i)
Active Region
The active region is defined as the region in which the emitter-base junction is forward biased and the collector-base junction is reverse biased.
(ii)
In the active region of a transistor, the transistor behaves as an amplifier
(c)
(i)
Effects of lack of protein
1. Leads to kwashiorkor
2. Anaemia
3. Slow healing of wounds
4. Hair and nail problem
5. Greater risk of bone fracture
6. Affects the formation of enzymes/hormones
7. Stunted growth
8. Metabolism slows down
9. Swelling in the legs/feet
10. Loss of muscle mass
(ii)
Chemical test for glucose
1. Add Fehling's/Benedit's solution to the test sample and heat
2. A brick red/reddish brown colouration indicates the presence of glucose
(d)
(i)
Soil resources
Soil resources are materials/components in the soil that support plant growth
(ii)
Agricultural activities that make the soil lose its nutrients
1. Continuous cropping/over cropping
2. Excessive drainage/run off
3. Burning of organic matter/bush burning
4. Irrigation leading to leaching
5. Crop removal
6. Over grazing
7. Poor tillage practices
8. Excessive use of chemical fertilizers