KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
The element used in the manufacturing of electronic components is
A.
sodium.
B.
fluorine.
C.
silicon.
D.
neon.
Answer: C
2.
The instrument used to measure relative humidity is
A.
anemometer.
B.
barometer.
C.
hygrometer.
D.
manometer.
Answer: C
Anemometer: Wind speed
Barometer: Atmospheric pressure
Hygrometer: Relative humidity
Manometer: Pressure acting on a column of fluid
3.
The force which is able to hold light objects on the surface of liquids is called
A.
surface tension
B.
friction
C.
capillarity
D.
viscosity
E.
cohesion
Answer: A
4.
The term used to describe a rabbit giving birth is
A.
culling.
B.
dubbing.
C.
kindling.
D.
weaning.
Answer: C
5.
Which of the following food items produces amino acids as end-product of digestion?
A.
Cabbage
B.
Fish
C.
Margarine
D.
Rice
Answer: B
6.
It is not advisable to use old electrical gadgets because they
A.
are not efficient.
B.
are dangerous.
C.
produce sparks.
D.
waste energy.
Answer: D
Old devices use much more energy than new models
7.
The main parts of the central nervous system are the
A.
brain and nerves
B.
spinal cord and the nerves
C.
brain and the spinal cord
D.
brain, the nerves and the spinal cord
E.
brain, the eyes, the ears and the nerves
Answer: C
8.
Which of the following substances is acidic?
A.
Wood ash
B.
Salt-petre
C.
Bee strings
D.
Bicarbonate of soda
Answer: C
9.
The intermediate host of the worm that causes bilharzia is
A.
man.
B.
mosquito.
C.
tsetse fly
D.
water snail
Answer: D
10.
The food processing method in which germs are prevented from multiplying by applying a low temperature is
A.
canning.
B.
drying.
C.
pickling.
D.
refrigeration.
Answer: D
11.
The energy transformation that occurs when sodium hydroxide is dissolved in water is
A.
heat to potential energy.
B.
chemical to light energy.
C.
chemical to heat energy.
D.
heat to kinetic energy.
Answer: C
The dissolution of sodium hydroxide in water is accompanied by the release of an amount of heat because the solvation of hydroxide ions and sodium ions is highly exothermic.
12.
Which of the following diseases can be caused by a housefly?
A.
Dysentery
B.
Elephantiasis
C.
Scabies
D.
Sleeping sickness
Answer: A
13.
Which of the following life processes is represented by the equation below?
Glucose + Oxygen → Water + Carbon dioxide + Energy
A.
Digestion
B.
Excretion
C.
Photosynthesis
D.
Respiration
Answer: D
Respiration Equation
C6H12O6 + 6O2 → 6H2O + 6CO2 + ATP (Energy)
Glucose + Oxygen → Water + Carbon dioxide + Energy
14.
When bread is chewed for a long time, it tastes sweeter because it
A.
is made from sugar and flour
B.
is digested into simple sugar
C.
mixes with saliva which is alkaline
D.
is broken into smaller pieces
E.
contains yeast which is sweet
Answer: B
15.
When an unknown solution reacted with magnesium, a gas was produced. Which of the following solutions could be the unknown solution
A.
Sodium chloride solution
B.
Sodium hydroxide solution
C.
Hydrochloric acid
D.
Calcium nitrate solution
Answer: C
When Hydrochloric acid react with magnesium a gas is always liberated.
16.
Washing down of soil nutrients beyond the reach of roots of plants is referred to as
A.
aeration.
B.
infiltration.
C.
leaching.
D.
percolation.
Answer: C
17.
The darkest part of a shadow formed during an eclipse is called
A.
Lunar eclipse
B.
Annular eclipse
C.
Penumbra
D.
Umbra
E.
Solar eclipse
Answer: D
18.
Which of the following conditions in a simple machine will make working difficult? When
A.
The load distance is equal to the effort distance
B.
The effort distance is twice the load distance
C.
The effort distance is three times the load distance
D.
Small effort moves through a longer distance
E.
The load distance is greater than effort distance.
Answer: E
19.
The above diagram illustrates the structure of an atom. The components labeled X and Y are respectively
A.
neutrons and shells.
B.
ions and neutrons.
C.
neutrons and nucleus.
D.
nucleus and neutrons
Answer: D
20.
The base of the N-P-N transistor normally
A.
is a p-type semi conductor.
B.
is an n-type semi conductor.
C.
is undoped semi conductor.
D.
have electrons as majority charge carriers.
Answer: A
21.
Heat from the sun reaches the earth by
A.
conduction
B.
convection
C.
radiation
D.
reflection
E.
refraction
Answer: C
22.
The reason why alum is added to water during treatment is to
A.
kill germs.
B.
give taste to water.
C.
make water colourless.
D.
make suspended particles to settle.
Answer: D
23.
Which of the following elements is a macro-nutrient of plants?
A.
Copper
B.
Manganese
C.
Molybdenum
D.
Sulphur
Answer: D
Macro-nutrients are required by plants in large amounts and micronutrients are required in trace amounts.
| Macro-nutrients | Micro-nutrients |
|
1. Carbon (C)
|
1. Iron (Fe)
|
24.
The female part of a flower is called the
A.
filament.
B.
petal.
C.
pollen grain.
D.
sepal.
E.
Style.
Answer: E
25.
The outer ear consists of the
A.
ossicles and eardrum.
B.
cochlea and pinna.
C.
ossicles and cochlea.
D.
pinna and eardrum.
Answer: D
26.
A person urinates more often in the rainy season than in the dry season because
A.
more sweat evaporates from the skin.
B.
less sweat evaporates from the skin.
C.
his kidney works faster
D.
he drinks less water.
Answer: B
When the weather is hot, our body system tries to keep our body cool by evaporating the water along with unwanted things (sweating) through the skin in the form of perspiration. So, skin helps the kidney by sharing its work of cleaning the body in hot weather. In cold conditions, as sweating is much decreased, there is no perspiration and the kidney has to bear the entire burden of excretion and hence we urinate frequently.
27.
Fish swims in water with little resistance because it possesses
A.
gills.
B.
scales.
C.
caudal fins.
D.
streamlined body.
Answer: D
28.
A pupil of mass 70 kg climbed a building of height 15 m. Determine the pupils potential energy at the top of the building.
[g = 10 m-2]
A.
10,500 J
B.
5,250 J
C.
1,050 J
D.
700 J
Answer: A
Potential Energy = Mass x Acceleration due to gravity x Height
Potential Energy = mgh
Mass = 70 kg
Acceleration due to gravity = 10 ms-2
Height = 15 m
Potential Energy = 70 x 15 x 10
Potential Energy = 10,500 J
29.
The equation Carbon (IV) oxide + water Chlorophyll→Light Glucose + Oxygen, represents
A.
Breathing
B.
Diffusion
C.
Photosynthesis
D.
Respiration
E.
Transpiration
Answer: C
30.
Which of the following gases helps in rusting?
A.
Carbon dioxide
B.
Hydrogen
C.
Oxygen
D.
Nitrogen
Answer: C
The rusting of iron (Fe) is shown by the chemical equation below:
4Fe + 3O2 + 6H2O → 4Fe(OH)3
31.
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
32.
Which of the following parasites is a plant?
A.
Bilharzia
B.
Dodder
C.
Lice
D.
Tapeworm
Answer: B
DODDER (Plant Parasite)
33.
Which of the following crops is not correctly matched with its group?
A.
Cowpea - cereal crop
B.
Cocoa - beverage crop
C.
Coconut - oil crop
D.
Cocoyam - tuber crop
Answer: A
34.
The most sensitive region of the eye to light rays is the
A.
retina
B.
pupil
C.
cornea
D.
iris
E.
lens
Answer: A
35.
The function of the white blood cells in humans is to
A.
produce haemoglobin.
B.
produce digestive enzymes.
C.
ensure blood clot during an injury.
D.
produce antibodies to fight disease causing organisms.
Answer: D
36.
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
37.
Which of the following farming practices is the best way of maintaining soil fertility?
A.
Crop rotation
B.
Seasonal cropping
C.
Constant ploughing
D.
Bush burning
E.
Mono cropping
Answer: A
38.
The structure that stores sperms temporarily in the male reproductive system of humans is
A.
epididymis.
B.
scrotal disc.
C.
sperm duct.
D.
testes.
Answer: A
39.
A load of 10 N is moved through a distance of 2 m. Calculate the work done.
A.
5 J
B.
10 J
C.
20 J
D.
50 J
Answer: C
Work done = Force x Distance
Force = 10 N
Distance = 2 m
Work done = 10 N x 2 m
Work done = 20 J
40.
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
The mercury expands and the volume increases.
THEORY QUESTIONS
1.
a)
State three external features of the weaver birds that adapt to live successfully in its environment.
b)
List four harmful effects of air pollution.
c)
i)
Draw the magnetic lines of force around a bar magnet.
ii)
If the work input of a machine is 30 joules, what would be its efficiency when the work output is 25 joules?
d)
Outline three principles involved in vegetable crop production.
a)
External features of weaver bird
1. Streamline body which reduces air resistance during flight
2. Wing for flight
3. Body covered with feathers for insulation
4. Tail features used for steering and balancing
5. Beak for feeding
6. Clawed legs for feeding
b)
Harmful effects of air pollution
1.It increases the risk of respiratory infections, heart disease and lung cancer
2. Smoke haze
3. Global warming/greenhouse effect/climate change
4. Irritation of eyets
5. Acid rain
c)
i)
Note:
Arrows on lines of force should point away from the north pole toward the south pole
ii)
Efficiency = x 100%
Work input = 30 J, work output = 25 J
Efficiency = x 100% = 83.33%
d)
Principles involved in vegetable crop production
1. Land selection
2. Selection of varieties
3. Method of propagation
4. Disease control
5. Pest control
6. Culture practices
7. Harvesting
8. Processing
9. Marketing
2.
a)
A body of mass 100 kg is raised to a height of 2 m above the ground.
i)
State the name of the energy possessed by the object by reason of the new position.
ii)
Calculate the value of this energy.
[g = 10 ms-2]
b)
i)
What is matter?
ii)
State two of the states of matter.
c)
i)
Describe the nature of a loamy soil.
ii)
Name any two plants nutrients.
d)
i)
State the causative organism for each of the following diseases:
α)
cholera;
β)
tuberculosis.
ii)
State one method of prevention of cholera.
a)
i)
Potential Energy
ii)
Potential Energy = Mass x Acceleration due to gravity (g) x Height
P.E = m x g x h = mgh
Mass = 100 kg, g = 10 ms-2, height = 2 m
Potential Energy = 100 x 10 x 2 = 2000 J
b)
i)
Matter is anything that has mass/weight and can occupy space.
ii)
States of matter
1. Solid
2. Liquid
3. Gas
4. Plasma
c)
i)
Nature of loamy Soil
Contains roughly equal quantities of sand, silt and clay and large amount of humus/organic matter or nutrient
ii)
Plant Nutrients
1. Nitrogen
2. Phosphorus
3. Potassium
4. Calcium
5. Magnesium
6. Sulphur
7. Zinc
8. Iron
9. Copper
10. Boron
11. Manganese
12. Molybdenum
d)
i)
Causative organism for cholera & Tubercolosis
α)
Cholera → Bacteria/ bacteria/ Vibrio Cholera
β)
Tubercolosis → T.B germ/ Tubercle Bacillus bacteria/ Mycobacterium
ii)
Prevention of cholera
1. Washing of hands under running water with soap before eating or after visiting the toilet
2. Boiling of water before drinking/ Drinking treated water
3. Proper disposal of faeces
4. Eating food hot
5. Keeping the environment clean
3.
a)
Classify each of the following substances as colloids, suspension or solution: Smoke, breast milk, powdered milk in water, sea water, mist, steel.
b)
i)
Define valency
ii)
State the valencies of the following elements and radicals:
α)
Iron
β)
Zinc
γ)
Hydroxyl
λ)
Carbonate
c)
Give one difference between plants and animals in terms of
i)
feeding
ii)
excretion
iii)
sensitivity
d)
i)
Draw and label a diagram to show how an image is formed in a pinhole camera.
ii)
State the characteristics of the image formed.
a)
| Colloid | Suspension | Solution |
|
Smoke
|
Powdered milk in water |
Sea water
|
b)
i)
Valency is the combining power of an element
OR
Valency is the number of charges on the ions of an element or radical.
ii)
α)
Iron → 2 or 3
β)
Zinc → 2
γ)
Hydroxyl → 1
λ)
Carbonate → 2
c)
| Characterisitics | Plants | Animals |
| Feeding | Are able to manufacture their food from simple substances | Depend on plants and animals for food |
| Excretion | Store excretory products at the bark | Discharge/remove excretory products through excretory organs |
| Sensitivity | Respond slowly to stimuli | Respond quickly to external stimuli |
d)
i)
ii)
Characteristics of the image formed by a pinhole camera
1. The image is diminished
2. The image is inverted
3. The image is real
4.
a)
What is vegetable crop?
b)
i)
What is air pollution?
ii)
State two humans activities that lead to air pollution.
c)
i)
List three modes of heat transfer.
ii)
Name the type of medium in which each mode of heat transfer you have listed in (i) takes place.
d)
Give three reasons why proteins are important in the diet of mammals.
a)
Vegetable crop is any (herbaceous) plant whose parts (seeds/fruits/roots/tubers/bulbs/stems/leaves/flowers) are used as foods.
b)
i)
Air pollution is the release of toxic/poisonous substances into the atmosphere.
ii)
Humans activities that lead to air pollution
1. Discharge of gases from factories
2. Smoke from exhaust engines and other machines
3. Smoke from domestic fires
4. Discharge of chloroflourocarbons from aerosol sprays and some refrigerators
5. Bush burning
6. Dust from open cast mining
7. Dust from sand winning and stone quarrying
8. Dust from construction
9. Smoke from cigarette/smoking
c)
i)
Modes of heat transfer
1. Conduction
2. Convection
3. Radiation
ii)
Medium for mode of heat transfer
1. Conduction → Solid
2. Convection → Liquid/gas/fluid
3. Radiation → vacuum/no material medium
d)
Importance of protein
1. Replacement/repair of worn out tissues/cells
2. Replacement of dead tissues/cells
3. Growth
4. Makes hormones
5. Makes enzymes
6. Provides energy
5.
(a)
(i)
What is refraction of light?
(ii)
Sketch a diagram to show the path of a light ray when it travels from air to glass.
(b)
Explain why it is difficult to separate iron and sulphur mixture after strong heating.
(c)
(i)
Give two examples of digestive enzymes produced in humans.
(ii)
For each of the enzymes given in (i), name the part of the human body where the enzyme is produced.
(d)
List four methods of applying fertilizers to crops.
(a)
(i)
Refraction of light is the bending/change in direction/change in velocity of light as it travels from one medium to another.
(ii)
(b)
Why it is difficult to separate iron and sulphur mixture after strong heating
It leads to a chemical change resulting in the formation of a compound (iron sulphide)/a compound is formed.
(c)
| Name of enzyme | Part of the human body where it is produced |
| Ptyalin | Salivary gland |
| Amylase | Pancreas/Small intestine |
| Pepsin | Stomach |
| Rennin | Stomach |
| Lipases | Pancreas/Small intestine |
| Trypsin | Small intestine |
(d)
Methods of applying fertilizers to crops
1. Ringing
2. Side placement/side dressing
3. Foliar/aerial application/spraying
4. Inter-raw placement
5. Band placement
6. Drilling
7. Broadcasting
8. Through irrigation water/fertigation
9. Top dressing
6.
(a)
Explain the following
(i)
Crackling noises are heard from a metal sheet roof when the weather becomes very hot.
(ii)
Railway tracks are laid with gaps in between their ends.
(iii)
A fitting mechanic washes his greasy hands with petrol and not with water.
(b)
What observation will be made if a piece of blue litmus paper is dropped in each of the following:
(i)
sodium hydroxide solution
(ii)
dilute hydrochloric acid
(iii)
lime juice
(iv)
distilled water
(v)
rain water
(c)
State any three ways in which constipation could be avoided.
(d)
What are the end products of the digestion of each of the following food substances?
(i)
Carbohydrates
(ii)
Proteins
(iii)
fats
(a)
(i)
Crackling noises are heard from a metal sheet roof when the weather becomes very hot
1. The metal sheet roof expand when heated but the nails which hold it prevent its free movement
2. Bending occurs and the cracking noise is caused by this bending movement
(ii)
Railway tracks are laid with gaps in between their ends
1.Railway tracks are laid with gaps in between their ends to make room for expansion when the tracks are heated
2. This prevents them from bending
(iii)
A fitting mechanic washes his greasy hands with petrol and not with water
1. Petrol is a solvent for grease but water is not
2. Therefore the petrol will dissolve the grease on his hands
(b)
| # | Substance | Observation |
| i) | Sodium hydroxide solution (akali/base) | No colour change |
| ii) | Dilute hydrochloric acid | Blue litmus paper changes to/turns red |
| iii) | Lime juice (acid) | Blue litmus paper changes to/turns red |
| iv) | Distilled water (neutral) | No colour change |
| v) | Rain water (slightly acidc) | Blue litmus paper changes to/turns purple |
(c)
Ways by which constipation can be avoided
1. Take meals at regular times
2. Do not overeat
3. Undertake a good amount of exercise
4. Take in enough water at early morning and late night
5. Eat plenty of fruits, vegetables and rouphages
6. Free bowels regulary/attend nature's call regularly
(d)
End products of digestion of food substances
(i)
Carbohydrates → glucose
(ii)
Proteins → amino acids
(iii)
fats → fatty acid and glycerol