All 119 questions from the Basic Education Certificate Examination (Junior WAEC) (BECE) Basic Science 2023 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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Human solid and liquid wastes from homes is known as
Sewage is the mixture of human solid and liquid wastes from homes. Sullage is only waste water from bathing and washing.
A masked trait is said to be
A trait that is hidden by a dominant allele is a recessive trait.
The following are reasons for skill acquisition except for
Skills are acquired for emergencies, self employment, survival and risk taking, not for fun making.
The incubation period in birds is between
Incubation is the period from when the eggs are laid to when they hatch.
Which of the following is an example of waterborne disease?
Typhoid is spread by contaminated water. The others are airborne.
A product of tobacco is
Cigarettes are made from tobacco leaves.
The process by which food substances are broken down into simple and soluble form is called
Breaking food into simple soluble form is digestion.
Study the diagram below and use it to answer questions 8 and 9. The diagram illustrates
The ray bends as it passes from air into glass. This is refraction of light.
The part labelled I is the
I is the ray that has bent after passing through the glass, so it is the refracted ray.
The distribution of materials within an organism is known as
Circulation transports materials such as food, oxygen and wastes round the body.
Which of the following is a flowering plant?
Ixora bears flowers. Conifers, ferns, liverworts and mosses do not.
The conversion of water vapour to liquid is known as
Vapour changing to liquid is condensation.
A microphone converts sound energy into ______ energy.
A microphone changes sound into electrical signals.
Which of the following is the chemical formula of water?
Water has two hydrogen atoms and one oxygen atom, H₂O.
Which of the following vitamins is also referred to as the "Sunshine vitamin"?
The skin makes vitamin D when exposed to sunlight.
In the solar system, the fourth planet from the sun is
The order is Mercury, Venus, Earth, Mars. Mars is fourth.
Which of the following is a renewable source of energy?
Wood can be replaced by growing new trees. The others are fossil fuels.
Metals expand when ______ energy is applied to them.
Heat makes the particles of a metal vibrate more, so it expands.
Matter are classified into ______ states.
Matter exists as solid, liquid and gas.
The following are methods of controlling soil erosion except
Bush burning exposes the soil and increases erosion.
The method of growing food crops and trees on the same piece of land is
Growing crops and trees together on one piece of land is agroforestry.
When two forces act on a body and it remains at rest, it means the forces acting on it are
A body stays at rest when the forces on it are equal and opposite, which cancel out.
The method of heat transfer demonstrated in the diagram below is
Warm water rises and cool water replaces it at the bottom, carrying the dye of the crystal. This is convection.
An engine pumps water of 50 kg through a vertical height of 4 m in 10s. Calculate the power of the pump in watts. [g = 10ms⁻²]
Power = mgh/t = (50 × 10 × 4)/10 = 200 W.
The energy possessed by a stationary ball is ______ energy.
A ball at rest has stored (potential) energy and no kinetic energy.
Which of the following is not a radioactive element?
Plutonium, radium, thorium and uranium are radioactive. Magnesium is not.
The method of separation of mixture demonstrated in the diagram below is
The diagram shows crude oil heated in a furnace and separated into fractions in a tower. This is fractional distillation.
When a bar magnet is suspended freely and it comes to rest, its ends point in the ______ direction.
A freely suspended magnet lines up with the earth's magnetic field in the North-South direction.
A radio set of 60 W is used for 12 hours per day for 30 days. Calculate the quantity of energy consumed in kWh.
Energy = 0.06 kW × 12 h × 30 days = 21.6 kWh.
A man pushes a 9 kg drum of oil through a distance of 5 m. Calculate the work done in joules. [g = 10 ms⁻²]
Work = force × distance = (9 × 10) × 5 = 450 J.
The following are objectives of Physical Education except
Friendly matches are an activity, not an objective of physical education.
Which of the following activities can be recommended for an elderly person?
Walking is gentle and safe for elderly people. The others are too strenuous or risky.
Who is the father of modern Olympic games?
Baron Pierre de Coubertin founded the modern Olympic Games in 1896.
Insufficient warm up activities may lead to
Muscles that are not warmed up are easily overstretched, which causes strain.
The ability of a group of muscles to sustain contraction over a period of time is
Muscular endurance is the ability to keep a muscle working for a long time.
The physical fitness component required in sprint is
A sprint is a short race that depends on speed.
An example of a tumbling exercise is
A forward roll is a tumbling exercise. The others are stunts or conditioning exercises.
The expressive movement of the body to conform with rhythm of sound is
Moving the body in time with music is dancing.
Which of the following is a partnership activity?
Duck fight is done by two people, one against the other. Press up, push up and frog jump are individual.
An example of an indoor activity is
Scrabble is a board game played indoors.
An injury that occurs as a result of over-stretching of the ligament of the joint is
Overstretching or tearing a ligament at a joint is a sprain. A strain affects a muscle or tendon.
Which of the following is a style in swimming?
Breast stroke is one of the swimming styles.
A place where two or more bones meet in the body is a
A joint is where two or more bones meet.
Which of the following is a stunt activity?
A hand stand is a gymnastic stunt. The vaults are box activities and rolls and neck spring are tumbling.
Which of the following is a box activity in gymnastics?
Vaulting over a box, such as the through vault, is a box activity.
Spiking is a fundamental skill in
Spiking (smashing the ball over the net) is a volleyball skill.
In a game of tennis, when the ball lands outside the service area, it is a/an ______ service.
A serve that lands outside the service area is a fault, so it is a faulty service.
For a service to be valid in the game of tennis, the ball must touch the opponents'
A legal serve must land in the opponent's service area.
Which of the following is a skill in the game of football?
Dribbling is a football skill.
How many players make a team in a handball game?
A handball team has 7 players on court (6 court players and a goalkeeper).
Which of the following is an equipment in swimming?
Floats are used as swimming aids. A pool is a facility.
The bones at a joint are held together by
Ligaments join bone to bone at a joint.
The ability of the body to maintain its equilibrium is
Balance is the ability to keep the body steady.
The physical fitness component that allows free movement at the joint is
Flexibility is the range of movement at a joint.
Which of the following is not a rule in discus throw?
The discus is thrown from the circle into the sector, not from the sector.
The postural deformity leading to bending of lumbar spine beyond normal level is
Excessive inward curve of the lower (lumbar) spine is lordosis. Kyphosis is a curve of the upper back.
Repairs of worn out tissues and building of white blood cells is the function of
Protein is the body-building food that repairs worn out tissues and builds cells.
How many hurdles does an athlete run over in a 110m race?
The 110m hurdles race has 10 hurdles.
The following are responsibilities of government in school physical education programme except
Government supports and encourages school sports. It does not punish principals whose schools take part.
Which of the following personnel can be recommended as a school games master?
The health education teacher is the closest to physical education and games.
The road sign below indicates
The diamond sign with two lines squeezing in from both sides is the narrow bridge warning sign.
A component of hydraulic machine that controls the fluid direction, pressure and flow rate is
Valves control the direction, pressure and flow rate of the fluid.
What is the ratio of a driving gear with 20 teeth that is driven by 5 teeth gear?
Ratio = 20 : 5 = 4 : 1.
Cleaning, inspection, oiling and retightening done within a specific time frame are all activities of ______ maintenance.
Scheduled cleaning, inspection, oiling and retightening to stop faults before they happen is preventive maintenance.
The following are types of belt drive except
A sprocket is used with chain drives, not belt drives.
The appliance represented below is a
The long rectangular tub with a rounded end and a drain hole is a bath.
Which of the following is not a building material?
An anvil is a blacksmith's tool, not a building material.
Rescue operations on the road are carried out by
The Federal Road Safety Corps rescues road accident victims.
Which of the following is not used for rescue operation?
An escalator is a moving staircase for people in buildings, not a rescue tool.
The Global System for Mobile (GSM) Communication is facilitated by ______ technology.
Mobile phones send and receive voice and data as radio waves.
Disposable hand gloves in first aid box is used to
Gloves stop germs passing between the helper and the injured person.
Tin is generally used for
Tin does not corrode easily, so it is used to coat other metals, as in tin plating.
Solders are alloys of tin and
Solder is an alloy of tin and lead.
The ability of a material to resist breaking is
Toughness is the ability of a material to absorb energy and resist breaking.
Which of the following tools is used for measuring external diameter of an object?
A micrometer screw gauge measures the outside diameter of small objects accurately.
Which of the following is commonly referred to as a general purpose machine?
The lathe can turn, drill, bore, thread and face, so it is the general purpose machine.
Metal sheets are usually cut with
Tin snips are made for cutting thin metal sheets.
The part labelled X in the drawing below represents
X points to the inner frame drawn round the working space on the paper, which is the border line.
Which of the following instruments is mainly used for measuring straight lines?
A scale rule (ruler) is for measuring and drawing straight lines.
A normal is at what angle to the tangent of a circle?
The normal (radius) meets the tangent at 90°.
Vertex point is part of a
A vertex is a corner point where lines meet, as in a triangle.
The block below is drawn in
The block is drawn with its vertical edges upright and the other edges at 30° to the horizontal, which is isometric drawing.
Oblique drawing is drawn at ______ to the horizontal plane.
Receding lines in oblique drawing are drawn at 45° to the horizontal.
Identify the plan of the block drawn below.
Looking down on the stepped block with the front at the bottom shows two horizontal surfaces (the top and the lower step) divided by one line.
Which of the following is a reduced scale?
In a reduced scale the drawing is smaller than the object, so the first number is smaller. 1:2 is reduced.
The drawing of a project to be mass produced includes
Working drawings for mass production show the orthographic views of the project.
Wood is classified into
Wood is classified into two groups, hardwood and softwood.
The tool drawn below is a
The tool has a large wooden head on a handle. It is a mallet, used to strike chisels without damaging them.
Which of the following materials is resistant to heat and appears glazy?
Ceramics are glazed and resist heat.
A woodwork machine that performs multiple operations in a school workshop is
The wood lathe can turn, shape, bore and sand wood, so it performs several operations.
The acronym "PC" stands for
PC means Personal Computer.
Which of the following electronic communication channels is a substitute to letter writing?
E-mail is the electronic form of a written letter.
Computers that perform multiple tasks are classified as
A general purpose computer can run many kinds of tasks.
Google chrome is an example of a/an
Chrome is a web browser. Google is the search engine.
The capacity of a DVD is measured in
A DVD holds about 4.7 GB, so it is measured in gigabytes.
Where is an expansion card inserted in a computer?
Expansion cards plug into expansion slots on the motherboard.
Which of the following is a peripheral device?
A keyboard is attached to the computer from outside. The others are internal parts.
The graphical illustration below is a
The bars touch each other and show a continuous range of heights. This is a histogram.
The acronym "SIM" stand for
SIM stands for Subscriber Identity Module.
The speed of a computer processor is measured in
Processor speed is measured in hertz (megahertz or gigahertz). Bytes measure storage.
Which of the following is a problem solving step in computing?
The problem solving steps are to define the problem, design a solution (algorithm or flowchart), code it and test it.
The smallest amount of disk space that can be allocated to hold a file in data storage is
A cluster is the smallest unit of disk space allocated to a file.
What will a disc jockey primarily use computer for?
A disc jockey uses a computer mainly to play music.
I. Bones II. Gold III. Metals IV. Stones V. Wood From the list above, identify the items that can be associated with stone age.
People of the Stone Age made tools from bones, stones and wood. Gold and metals came later.
In Microsoft Excel environment Ctrl + ______ will enter the current date in a cell.
Ctrl + ; inserts the current date in a cell. Ctrl + Shift + ; inserts the time.
Jacquard loom was used in ______ industry.
The Jacquard loom used punched cards to control the weaving of patterns in cloth.
The operator ≠ in BASIC programming stands for
The sign ≠ means not equal to (written <> in BASIC).
The specialized programs that help in locating information on the internet are
Search engines such as Google are programs that find information on the internet.
Which of the following is not a type of monitor?
CRT, LED, LCD (Liquid Crystal Display) and OLED are monitor types. "Light Crystal Display" is not.
Which of the following is a volatile storage device?
RAM loses its contents when the power is switched off, so it is volatile.
The process of saving addresses from the internet for future use is
Saving a web address to return to later is bookmarking.
A character in word processing that is set above the baseline is
Text set above the baseline, like the 2 in x², is superscript.
The modern gadget used for the acquisition, processing, storage and dissemination of information include the following except
A digital wristwatch only displays time and does not acquire, store and send information the way the others do.
Which of the following is a mobile phone operating system?
Android is the operating system used on mobile phones.
The function of the "CLS" command in BASIC Programming is to
CLS means clear screen.
Ctrl + Z will ______ in Microsoft Paint.
Ctrl + Z is the undo shortcut.
In spreadsheet by default, formula usually begins with the ______ sign.
Every spreadsheet formula starts with an equals sign.
A grid with labelled columns and rows is called ______ in Microsoft Excel.
A worksheet is the grid of labelled columns and rows.
Which of the following ages is not a category of the information era?
Iron age is not a stage of the information era.
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