OBJECTIVE TEST

The arrow in the circuit symbol of either n-p-n or p-n-p transistor is always on the

base lead.

collector lead.

emitter lead.

receiver lead.

Answer: C

A smaller heavenly body, which orbits a bigger one could be described as a

comet.

meteor.

moon.

sun.

Answer: C

A boy stepped on a banana peel on the ground and fell because the

boy was not wearing shoes.

ground was too hard.

banana peel reduced the friction on the ground.

banana peel increasethe friction on the ground.

Answer: C

Friction is the force that resists motion when the surface of one object comes in contact with the surface of another.

The by-products of respiration are

carbon dioxide and heat

carbon dioxide and water

oxygen and heat

oxygen and water

Answer: B

One function of the root system of plants is to

excrete carbon dioxide.

store waste materials.

hold the plant firmly in the ground.

prepare food for the plant.

Answer: C

The type of liquid suitable to construct a thermometer to read temperatures of about 150^oC is

alcohol.

mercury.

turpentine.

water.

Answer: B

Why mercury is used in thermometers

Mercury is used in thermometers because It has a high coefficient of expansion so that even a small rise in temperature brings about sufficient expansion which can be detected in the capillary of the calibrated part of the thermometer.

Mercury is a liquid from -39^oC to 357^oC.

Mercury is a good heat conductor. As a result, the mercury level indicates the temperature as soon and accurately as feasible.

Mercury does not adhere to the surface of the glass. As a result, it can freely move inside the capillary glass tube.

Mercury expands uniformly across the entire temperature range. As a result, the temperature is accurate.

Urinating in rivers is a common manner of spreading diseases such as

cholera

bilharzia

malaria

measles

Typhoid

Answer: B

Which of the following electronic components are used to produce oscillator circuits?

I. Transistor
II. Inductor
III. Capacitor

I and II only

I and III only

II and III only

I, II and III

Answer: B

Which of the following is cultivated on plantation basis?

Okro

Tomato

Rubber

Cassava

Maize

Answer: E

10.

The property of water that causes mosquito larvae to float on it is

density.

viscosity.

surface tension.

volume.

capillarity.

Answer: C

Surface tension is the force or property of a liquid which makes the surface to behave as if it were a stretched elastic skin or membrane.

11.

Which of the following processes can occur at all temperatures?

Boiling

Evaporation

Melting

Sublimation

Answer: B

12.

A metal that is used as a thermometric liquid is

aluminium.

copper.

mercury.

silver.

Answer: C

13.

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]

10,500 J

5,250 J

1,050 J

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

14.

The process whereby a hot saturated solution is cooled to obtain the solute is called

condensation.

crystallization.

distillation.

evaporation.

Answer: B

15.

The disease in humans which is associated with insufficient intake of calcium is

goiter.

kwashiorkor.

rickets.

scurvy.

Answer: C

16.

Addition of more solvent to a solution makes the solution more

dense.

dilute.

concentrated.

saturated.

super saturated.

Answer: B

17.

Which of the following is a plant parasite?

Capsid

Caterpillar

Dodder

Louse

Nematode

Answer: C

18.

Carbon dioxide in the blood is removed from the body through the

kidneys.

lungs.

mouth.

skin.

Answer: B

19.

The part of the flower that develops into a fruit is the

ovary.

ovule.

stamen.

style.

Answer: A

20.

The source of all forms of energy can be traced to

clouds.

earthquakes.

tides.

sunlight.

Answer: D

The energy of the sun is the original source of most of the energy found on earth. We get solar heat energy from the sun, and sunlight can also be used to produce electricity from solar (photovoltaic) cells. The sun heats the earth's surface and the Earth heats the air above it, causing wind.

21.

Which of the following apparatus is not required in the process of distillation in the laboratory?

Condenser

Evaporating dish

Bunsen burner

Round bottom flask

Answer: B

22.

Washing down of soil nutrients beyond the reach of roots of plants is referred to as

aeration.

infiltration.

leaching.

percolation.

Answer: C

23.

Which of the following arrangements show the correct order of increasing complexity of structures in living organisms.

cells → organs → tissues → systems

cells → tissues → organs → systems

cells → systems → tissues → organs

cells → tissues → systems → organs

Answer: B

24.

Soil aeration could be improved through

mulching

irrigation

soil drainage

fertilizer application

Answer: A

25.

Heat from the sun by

I. Conduction
II. Convention
III. Radiation

I only

II only

III only

I, II and III

Answer: C

Radiation: is the transfer of heat energy through space by electromagnetic radiation.

Conduction: is the transfer of heat energy from one substance to another or within a substance

Convection: is the transfer of heat energy in a fluid.

26.

Which of the following substances is a mixture?

Water

Sodium chloride

Sodium chloride solution

Iron filing

Answer: C

27.

Which of the following farming systems is most effective in maintaining soil fertility?

Crop rotation

Land rotation

Mixed cropping

Monoculture

Answer: A

28.

An animal feed made up of high fibre is most likely to contain

maize grain.

silage.

soybean.

wheat grain.

Answer: B

29.

One of the characteristics of wind pollinated flowers is that they

are large and conspicuous.

are usually scented.

have nectar.

have feathery stigma.

Answer: D

30.

An aluminium cube with side measuring 2 m has a mass of 24 kg. Calculate the density of the aluminium.

48 kgm^-1

24 kgm^-1

12 kgm^-1

3 kgm^-1

Answer: D

Density = $\frac{Mass}{Volume}$

Volume of a cube = Length x Length x Length

Volume of the aluminium = 2 x 2 x 2 = 8 m³

Mass = 24 kg

Density = $\frac{24}{8}$ = 3 kgm^-3

31.

An example of a non-living tissue used in osmosis experiment is

cellophane

filter paper

potato

polythene

Answer: A

32.

A piece of stone could be classified as an opaque material because it

absorbs all the light incident on it.

does not absorb light incident on it.

allows all the light incident on it to pass through it.

does not allow light incident on it to pass through it.

Answer: D

33.

Landrace is a breed of

cattle.

goats.

pigs.

sheep.

Answer: C

34.

The efficiency of a machine is given by the ratio

$\frac{Load}{Effort}$

$\frac{Momentum}{Velocity}$

$\frac{Distance moved by effort}{Distance moved by load}$

$\frac{Work input}{Work output}$

$\frac{Mechanical advantage}{Velocity ratio}$

Answer: E

35.

Water contains two elements, hydrogen and oxygen, in the ratio of

1:2

1:3

2:1

3:1

Answer: C

H₂O = Water

36.

The chemical formula of an aluminium sulphide is Al_yS₃.Determine the value of y

Answer: B

When writing the chemical formula, the element(s) or compound(s) exchange their valencies.The sulphur has that of the aluminium element's valency (3) and so the value of y will also be the valency for sulphur

The atomic number for sulphur is 16 so on the electronic configuration, sulphur will have 2,8 and 6 on the last shell.

In order for sulphur to attain stability, it has to gain 2 electrons to make it 8 in the last shell, hence the valency of sulphur is 2 and so the value of y will be 2 (the valency of sulphur)

NOTE: The atomic number for aluminium is also 13, hence the electronic configuration will be 2,8 and 3. Aluminium could lose its 3 electrons in order to be stable, hence the valency of aluminium is also 3

Hence the chemical formula for aluminium sulphide is Al₂S₃

37.

Which of the following methods of preserving food make use of heat energy?

I. Drying
II. Frying
III. Salting
IV. Canning

I and II only

I and IV only

III and IV only

I, II and III only

Answer: D

38.

Digestion of rice in humans starts from the

stomach.

gullet.

mouth.

colon.

Answer: C

Rice is a carbohydrate/starch and digestion of starch starts from the mouth.

The salivary enzyme amylase begins the breakdown of food starches into maltose, a disaccharide.

39.

Which of the following environmental factors increases sweating in humans?

Low temperature

Low pressure

High pressure

High temperature

High humidity

Answer: D

40.

The by-product of photosynthesis is

carbon dioxide.

starch.

oxygen.

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.

THEORY QUESTIONS

Describe briefly how the volume of an irregular shaped lead ball could be measured.

State three characteristics of living things.

What is pollution?

ii)

Name one air pollutant.

State three factors which influence vegetable crop production.

How to measure the volume of an irregular object

1. Pour water into a measuring cylinder and take note of the volume (V₁)
2. Gently drop the irregular object into the water and take the new volume recorded (V₂)
3. Calculate the volume of the irregular object by subtracting the volume of the water (V₁) from the final volume (V₂)
4. Thus volume of the irregular object (ball) = V₂ - V₁

Characteristics of living things

1. Respiration
2. Movement/Locomotion
3. Reproduction
4. Excretion
5. Feeding/Nutrition
6. Growth
7. Sensitivity/Irritability

Pollution is the introduction of waste/toxic/unwanted/harmful/dangerious substances into the environment which causes harm to humans and other living organisms.

ii)

Air Pollutants

1. Carbon monoxide (Carbon (II) oxide)
2. Smoke
3. Dust
4. Car Exhaust/Fumes/lead
5. Chloroflurocarbon/ CFC
6. Sulphur dioxide (Sulphur (IV) oxide)
7. Sulphur trioxide (Sulphur (VI) oxide

Factors which influence vegetable crop production

1. Soil fertility/Soil type
2. Soil structure/texture/porosity
3. Temperature
4. Rainfall/Water
5. Sunlight
6. Wind
7. Soil pH

(a)

(i)

Give the names of organisms which cause the following diseases:

Sleeping sickness, Cholera, Malaria, Bilharzia

(ii)

Which part of the following crops does a farmer usually grow?

Banana, cocoyam, tomato, ginger, yam, cassava

(b)

Name the organs used by the following organisms for respiration:

(i)

Tilapia

(ii)

Toad

(c)

(i)

What happens to the temperature of water that is boiling in an open container?

(ii)

Give two characteristics of a liquid.

(iii)

Name the three processes by which heat is transmitted.

(iv)

State two applications of the expansion of solids in everyday life.

(d)

Explain the following terms:

(i)

Physical change

(ii)

Chemical change

(e)

State whether each of the following is a physical or a chemical change

(i)

rusting of iron

(ii)

freezing of water

(iii)

burning of wood

(iv)

fermentation

(v)

grinding of chalk

(vi)

dissolving sugar in water

(f)

Name the compound formed when theh following elements combine:

(i)

Iron and sulphur

(ii)

Zinc and oxygen

(iii)

Sodium and chlorine

(iv)

Calcium and chlorine

(a)

(i)

Disease	Organism
Sleeping sickness	Trypanosome/Trypanosoma
Cholera	Vibrio cholerae
Malaria	Plasmodium
Biharzia	Blood fluke/Schistosoma/Schistosome

(ii)

Crop	Part grown
Banana	Sucker
Cocoyam	Corm/underground stem
Tomato	Seed
Ginger	Rhizome/underground stem
Yam	Tuber/stem tuber/underground stem
Cassava	Stem cutting/cassava sticks

(b)

Organs for respiration:

(i)

Tilapia → Gills

(ii)

Toad → Lungs or skin or mouth

(c)

(i)

The temperature remains the same/unchanged/constant

(ii)

Characteristics of a liquid

1. Has no definite shape/takes the shape of container
2. Has volume/occupies space
3. Molecules/particles are not in fixed positions
4. Molecules move about randomly
5. Not compressible

(iii)

1. Conduction
2. Convection
3. Radiation

(iv)

Applications of the expansion of solids in everyday life

1. Railway line gaps
2. Rollers in metal bridges
3. Thermostat
4. Concrete slabs
5. Riveting
6. Fixing wheels

(d)

(i)

Physical change is a change in which no new substance is formed

Physical change is a change in which no new substances are formed

Physical change is a change in which substances retain their individual properties.

(ii)

Chemical change is a change in which a new substance is formed

Chemical change is a change in which new substances are formed

Chemical change is a change in which new substances formed have entirely different properties from their constituents.

(e)

Physical change	Chemical change
Freezing of water	Rusting of iron
Grinding of chalk	Burning of wood
Dissolving sugar in water	Fermentation

(f)

(i)

Iron and sulphur → Iron sulphide/Iron (II) sulphide/Iron (III) sulphide

(ii)

Zinc and oxygen → Zinc oxide

(iii)

Sodium and chlorine → Sodium chloride

(iv)

Calcium and chlorine → Calcium chloride

(a)

(i)

What is indiscriminate sex?

(ii)

Give two reasons why teenagers indulge in indiscriminate sex.

(b)

Name two sources each of

(i)

natural light;

(ii)

artificial light.

(c)

State three ways in which soil texture is important in crop production.

(d)

Write down the systematic name of each of the following chemical compounds:

(i)

FeS;

(ii)

CO;

(iii)

Cu₂O;

(iv)

NaOH.

(a)

(i)

Indiscriminate sex is the act of having sexual intercourse with any person or having many/multiple/different sexual partners.

(ii)

Reasons why teenagers indulge in indiscriminate sex

1. Peer pressure
2. Lack of parental guidance
3. Poor financial status of parents/poor homes
4. Lack of sex education
5. Weak morals/exposure to pornographic material

(b)

(i)

Sources of natural light

1. Sun
2. Fireflies
3. Stars
4. Lightening
5. Glow worm
6. Volcano

Note: the moon is not a source of natural light

(ii)

Sources of artificial light

1. Heated filament/electric bulb
2. Firecrackers
3. Torchlight/flashlight
4. Buring charcoal
5. Lantern
6. Satellite
7. Wood fire
8. Lamp

(c)

Ways in which soil texture is important in crop production

1. It helps the farmer to know the type of farming method to use
2. It has an effect on water and air relationship
3. It influences the soil temperature
4. It influences the water holding capacities of the soil
5. Knowledge of soil texture is important in determining soil management practices to adopt
6. It helps the farmer to know the type of crop to plant

(d)

Systematic name of chemical compounds:

(i)

FeS → Iron (II) sulphide

(ii)

CO → Carbon (II) oxide

(iii)

Cu₂O → Copper (I) oxide

(iv)

NaOH → Sodium hydroxide

The diagram below is an illustration of a cocoa pod infected by a disease.

Study the diagram carefully and answer the questions that follow.

Name the disease illustrated on the pod.

ii)

Mention the causative organism of the disease.

iii)

Describe one symptom of the disease.

iv)

State one farm practice that promotes the spread of the disease.

Give one practices farmers could adopt to control the disease.

The diagram below is an illustration of a cuboid with faces A, B and C shown and sides a, b and c indicated.

Study the diagram carefully and answer the questions that follow.

Measure and record the length of each of the sides labelled a, b and c in centimeters.

ii)

Determine the area of each of the faces A and B.

iii)

If the weight of the cuboid is 100N, determine the pressure exerted by the cuboid in N/cm² when it lie on

α)

face A;

β)

face B.

iv)

From your results in (iii), explain how pressure exerted by a body changes with the area on which it lie.

The diagram below is an illustration of three different types of teeth, labelled A, B and C in humans.

Study the diagrams carefully and answer the questions that follow.

Name each type of teeth labelled A, B and C.

ii)

State one function of the type of teeth labelled A, B and C.

iii)

State two observable differences between the tooth labelled A and that labelled B.

iv)

Mention two ways of ensuring proper dental care.

The diagram below is an illustration of an experimental set-up used to separate water and salt from salt solution.

Study the diagram carefully and answer the questions that follow.

Name each of the parts labelled I, II, III and IV.

ii)

Name the method of separation used.

iii)

State one function of each of the parts labelled II and III.

iv)

Name three physical processes that are involved in the separation of the mixture.

Black pod

ii)

Fungus/Phytophthora

iii)

Systems of disease

1. Beads/pod becomes black
2. Brown spores/spots/patches
3. Powdery spores
4. Black patches/spots

iv)

Farm practices that promote disease

1. Leaving farm weedy/bushy
2. Excessive shading of plants
3. Planting infected seedlings/seeds
4. Poor field sanitation/hygiene
5. Use of infected tools/equipment on farm
6. Overcrowding of plants

Practices to control disease

1. Remove/burn infected/infested pods
2. Weed regularly
3. Spray pods with recommended fungicide/recommended chemical
4. Remove excess shade
5. Prune (diseased) branches/Pruning

a = 2.0 cm
b = 4.0 cm
c = 5.0 cm

ii)

Area = Length x Breadth

Area for face A

Area = a x b
Area = 2 cm x 4 cm = 8.0 cm²

Area for face B

Area = b x c
Area = 4 cm x 5 cm = 20.0 cm²

iii)

Pressure = $\frac{Force}{Area}$

Force = 100N

α)

Area = 8.0 cm²

Pressure = $\frac{100}{8}$ = 12.5 N/cm²

β)

Area = 20.0 cm²

Pressure = $\frac{100}{20}$ = 5.0 N/cm²

iv)

When area is small, pressure is high/when area is large, pressure is small

Pressure and area are inversely proportional.

A → Molar/premolar
B → Canine
C → Incisor

ii)

Functions of A (Molar/Premolar)

1. For grinding
2. For crushing
3. For chewing

Functions of B (Canine)

1. For stabbing
2. For tearing
3. For piercing

Functions of C (Incisor)

1. For cutting
2. For biting

iii)

Differences between A (Molar/premolar) and B(Canine)

	A (Molar/premolar)	B(Canine)
1.	Large size	Small in size
2.	Has three roots	Has a single root
3.	Cusped surface/multiple projections	(Bluntly) pointed surface/projection/conical

iv)

Ways of ensuring proper dental care

1. Regular visit to the dentist
2. Regular brushing of teeth
3. Avoiding excessive intake of sugary food
4. Eating food rich in vegetables
5. Eating a lot of fruits
6. Eating food rich in calcium
7. Using the teeth for the right purpose
8. Avoid eating too hot/too cold foods

I → Retort/clamp stand
II → Thermometer
III → Condenser
IV → Water/distilled water

ii)

(Simple) distillation

iii)

Functions of II (Thermometer)

Measures the temperature at which the mixture (sea water) boils/measures the temperature of water vapour above the mixture/measures the temperature within the flask.

Functions of III (Condenser)

Used to cool the vapour/condense the vapour/changes the vapour to water.

iv)

Physical processes involved in the method of separation

1. Boiling/heating
2. Vapourization/vaporization/evaporation
3. Condensation

Define each of the following terms:

α)

solvent;

β)

solute.

ii)

Name one common solvent used in the home.

Explain the following terms as used in animal production:

ration;

ii)

dehorning.

What is an element?

ii)

Write down the symbol of each of the following chemical substances:

α)

Potassium;

β)

Sulphur.

Explain each of the following terms:

Mixed farming;

ii)

Mixed cropping.

α)

Solvent is a substance that dissolves another substance.

β)

Solute is a substance that dissolves in a solvent.

ii)

Common solvent used in the home

1. Water
2. Alcohol
3. Turpentine
4. Kerosene
5. Petrol

Ration is the amount/quantity of food allowed an animal for a day/specific period of time.

ii)

Dehorning is the removal of the horns of animals to reduce fighting among them.

An element is a substance that is made up of atoms of the same kind.

An element is a substance that cannot be broken down into any simplier form (by any known chemical means).

ii)

α)

Potassium → K

β)

Sulphur → S

Mixed farming is a type of farming in which animals and plants are produced on the same piece of land at the same time.

ii)

Mixed cropping is the cultivation of more than one type of crop on the same piece of land at the same time.

Note: the at the same time phrase is important in both explanations.

(a)

What is a living cell?

(b)

Give one function of each of the following components of a living cell:

(i)

cell membrane

(ii)

chloroplast

(iii)

nucleus

(c)

Make sketches to show the arrangement of the particles in each of the three states of matter.

(d)

What instrument would you use to measure each of the following quantities:

(i)

volume of a liquid

(ii)

mass of a stone

(iii)

time

(iv)

speed of the wind?

(a)

Living cell is the smallest basic unit of a plant or animal/living organism

(b)

(i)

Functions of the cell membrane

1. It protects a cell
2. It allows only selected substances to enter or leave the cell

(ii)

Function of the chloroplast

It contains chlorophyll (green pigment) which traps sunlight for photosynthesis

(iii)

Functions of the nucleus

1. Embodies the genetic information (genes) of the organism
2. Makes cell division or reproduction possible
3. Controls the activites of the cell

(c)

Arrangement of molecules in a solid

Arrangement of molecules in a liquid

Arrangement of molecules in a gas

(d)

Measuring instruments

#	Qunatity	Instrument(s)
i.	Volume of a liquid	1. Measuring cylinder 2. Burette 3. Volumetric flask
ii.	Mass of a stone	1. Beam balance 2. Chemical balance 3. Top pan balance 4. Electronic balance
iii.	Time	1. Watch/clock 2. Sundial 3. Hour glass
iv.	Speed of the wind	Anemometer