All 100 questions from the Junior Secondary Certificate Examination (JSCE) Basic Science 2023 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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A boy collapsed in the class and was rushed to the school clinic. The following are the professionals that will attend to him in the clinic.
A clinic is staffed by health professionals: nurse, laboratory technologist and doctor.
A plant grows towards the source of light as shown in the diagram. This action indicates .......
Light is the stimulus; the plant growing towards it is the response.
Ozone layer is a protective which protects the earth from the UV ray of the sun. The protective layer is found in the .....
The ozone layer lies in the stratosphere.
Absalom has sore in his mouth which signifies that he lacks vitamin C. This disease is known as ......
Lack of vitamin C causes scurvy.
The spread of AID has been reduced because of the public awareness campaign and care on AIDS. The most common means of transmitting AIDS is .....
Sexual intercourse is the most common route of HIV transmission.
A drainage pattern which has branches like that of a tree is known as .....
Tree-like branching = dendritic.
Interpret the lines A, B, C, D, E, F and G as the Rainbow colours.
The rainbow has seven colours; only option A lists seven (Red, Orange, Yellow, Green, Blue, Indigo, Violet; A has Blue and Green swapped).
Sound can be produced by a musical instrument and other vibrating bodies and can travel through medium. Sound cannot be transferred through one of the following media.
Sound needs a material medium; it cannot travel in a vacuum.
Esther can see far and near objects, therefore images are formed on the retina. How does the image appear on the retina?
The image on the retina is real and inverted.
Government advices planting of trees in all houses, the purpose ......
Trees give off oxygen and cool the environment.
1. Kerosine, 2. Ear-ring, 3. Body spray. One of the following is not true about the three samples.
Kerosine is a liquid, the ear-ring a solid and body spray a gas. Only the solid has a definite shape, so 'all three have definite shapes' is not true.
After digestion, food is turned into liquid form which can easily be absorbed into the body. The structure that absorbs the digested food is known as ......
Taking digested food into the blood is absorption.
In female reproduction, the fertilized egg moves to the uterus where it is implanted. This process takes place ......
Implantation occurs about 6 to 7 days after fertilization.
Drug traffickers are always caught at the international airport. The Government Agency set up to control traffic of hard drug is ......
The National Drug Law Enforcement Agency (NDLEA) controls hard drugs.
In the electric circuit above, the resistance of the variable resistor was increased, deduce the size of current and brightness of the lamp.
I = V/R. More resistance means less current, so the lamp gets dimmer.
Chemical changes occur around us every day, examples include the following EXCEPT ......
Sieving only separates by size; it is a physical change.
The soap we use to wash our clothes is made up of molecules that contains different atoms so it is a/an ......
Molecules with different kinds of atoms form a compound.
A man pushes a drum of palm oil of 20kg up an inclined plane AC. If AC is 5m, calculate the potential energy of the drum at A.
PE = mgh = 20 x 10 x 5 = 1000 J, taking the 5 m as the height of A from the ground.
The earth moves round the sun in 365 1/4 days. This type of movement the earth undergoes is known as ......
Going round the sun is revolution; spinning on its axis is rotation.
A little boy threw his ball up and the ball came down on its own. The force responsible for this action is ......
Gravity pulls objects towards the earth.
Radioactive elements could either be natural or artificial, select the natural radioactive element from options below.
Uranium occurs naturally and is radioactive.
Ikeja is an example of an ecosystem which contains biotic and abiotic components. Identify the abiotic component in the list provided.
Soil is non-living, so abiotic.
Security man forgot a 5 litre keg of petrol in the school compound without a cover. He found the keg empty after two days. Deduce the process that have taken place.
Uncovered petrol is a volatile liquid that evaporates.
The electric wire in our homes that connect appliances are usually covered with a layer of plastic. Justify this act.
Plastic is an insulator, so it prevents electric shock.
The type of circuit connection in homes or schools that allows the flow in different direct is .....
Parallel circuits give current separate paths.
The practice of science around us is either good or bad, the wrong application of science as a result of bad practice is ......
Mercy killing is a misuse of science.
A man of mass 50kg ascends a set of stairs 5m high in 5 seconds. Calculate the power expended if the acceleration due to gravity is 10m/s2
P = mgh / t = (50 x 10 x 5) / 5 = 500 W.
The chemical name and formula of rust found of exposed iron or metal is ......
Rust is hydrated ferric oxide, Fe2O3.
Mr. Ojo is an electrician, constantly he needs an insulator to protect himself from electric shock. Which of the following do you think he needs most?
Rubber gloves insulate the hands, which touch the wires.
School building is mainly for educational purposes, assembly building is meant for entertainment and religious activities. What is hospitality building meant for?
Hospitality buildings are hotels and recreation centres.
Which of the following is NOT an aspect of domestic plumbing?
Domestic plumbing covers water supply, drainage and sanitary fittings.
Calculate the percentage moisture content of a timber which weighs 250grams before drying and 150grams after drying.
Water lost = 250 - 150 = 100 g. 100/250 x 100 = 40%.
The process of reducing the drawing of an object to fit into the paper is known as .....
Reducing a drawing to fit is scaling down.
One of the following hand tools is used for cutting in both wood and metals.
A hack saw cuts both wood and metal.
The distribution of weight of a building over the surface area is attached to the .....
The foundation spreads the building's load over the ground.
Electrical accessories are coated with protective materials in order to make them .....
The coating protects them from hazards in the environment.
Which of the following is an electrical wiring tool?
A plier is used for cutting and twisting wires.
A conductor is easily identified by its ability to .....
The printed options are unclear; a conductor is identified by allowing electricity through.
The most important rule for lettering is.....
Lettering must be legible (easy to read).
Which of the following combination of drawing instrument is best used to draw a vertical line?
The T-square gives the base; the set-square slides along it to draw verticals.
The following plastic item was found in the classroom environment of a Basic four pupil. Which of them is a typical example of thermoplastic?
Plastic chairs soften on heating (thermoplastic); sockets are thermosetting.
Putting safety into consideration, a good workshop should have the following EXCEPT ......
A very smooth tiled floor is slippery and unsafe.
Calculate the area of a square of lengths 8cm.
Area = 8 x 8 = 64 cm2.
In a drawing lesson class, the teacher asked the students to set their drawing paper on the drawing board properly. Which of the following is best preferred to hold down the paper on the board?
Masking tape holds the paper without damaging it.
Which of the following types of wood is good for making furniture?
Hardwood is durable and good for furniture.
Robot is a technological development known as .....
Robots are an application of artificial intelligence.
In a community of learners, consisting 500 males and 3500 females among who are lower Basic pupils, upper Basic pupils and senior secondary students. Who among them will you recommend for technological advancement training?
Upper basic and senior secondary students are old enough for technology training.
What type of technology is being practiced by Tade and Tolu who are found of breaking to school on daily basis?
Not clearly stated; breaking into school with crude means is under-developed technology.
Blue print is essential to a building because it .....
The blueprint gives everyone the same plan to work from.
A gear is a special drive that transmits ..... to other parts of the machine.
Gears transmit power (motion and torque).
The maintenance needed to be carried out on a gadget that makes strange sound while still working is ......
The gadget still works, so action before breakdown is preventive.
Fastening two pieces of wood without nailing can be achieved using ......
Wood joints fasten pieces without nails.
Re-arrange the following processes. i. Wood seasoning ii. Wood preservation iii. Felling of trees iv. Wood conversion
Fell the tree (iii), convert to planks (iv), season (i), then preserve (ii).
Preventive maintenance include the following EXCEPT
Replacing worn-out parts is done after wear or failure (corrective).
The type of drawing carried out without measuring instrument is called .....
Free-hand drawing uses no instruments.
One of the following is an essential instrument for free-hand sketching.
A pencil is all that free-hand sketching needs.
Peter started growing beard on his chin, develop broading chest and adamic apple which are all sign of .....
These are signs of puberty.
Contact sport is a sport in which players are involved in physical collation with the opponents during the cause of play. Which of the following is an example of non-contact sport?
Swimmers do not make physical contact.
When your opponent's left foot touches baseline during the second serve buts does not completely cross the line, the call is?
Touching the baseline during a serve is a foot fault.
In Judo game if a Judoka has half point, it is called Waza-ari, while the full point is called ......
A full point is Ippon.
In Athletic Chart, the events is grouped into track and field events and all track events involves running at a distance, while the field events involves ......
Field events are jumps and throws.
If safety means freedom from hazards or dangers then acquiring knowledge and skills to handle unexpected hazards will be .....
Learning about hazards is safety education.
Ballet, cheorography and aerobatic dance are grouped under which classes of dancing ......
These are modern dance forms.
Separating of bottles, plastics, nylons and papers when disposing our waste materials is one of refuse disposal method called ......
Bottles, plastics and nylon do not decompose.
Physical scientific procedure giving to injured or diseased athletes who engaged in accident sport. i.e. rehabilitation treatment is known as ......
Physiotherapy is physical treatment for injury.
A standard dimension of a swimming pool is ..... length, ..... width and ..... depth.
Olympic pool: 50 m long, 25 m wide, 2 m deep.
Modern boxing started in 1866 when a new set of rules of three minutes rounds with one minute rest was given by
The Marquess of Queensberry rules.
A student fell from the staircase and broke his leg. In physical and Health education class, we are taught to .....
First aid comes first.
Every three ethnic groups in Nigeria have traditional dance activities in Yoruba, we have Bata, Bolojo, Eyo and Apepe, in Hausa, we have .......
Hausa dances include Koroso, Sharo and Lauga.
Postural defects are Kyphosis, Scoliosis
Lordosis is the third common postural defect.
Activities performed during our free time or period has so many benefits. One of it is ......
Leisure activities help develop skills.
Power is the ability apply force or energy at a speed movement as one of the component of physical fitness, which sport activities can be used.
Throwing events need explosive power.
The preliminary exercise which stimulates the body muscles ready for the main sporting activities is called
Warm-up.
The movement of a text automatically to another line is ......
Word wrap.
The symbols B, I, U are commonly used buttons created in a ......
Bold, Italic and Underline are on the formatting toolbar.
To which of the following is IT profession useful? i. Education ii. Farming iii. Medicine
IT is useful in all three.
To prevent loss of Data in case of power outage requires ......
A UPS keeps the computer on during an outage.
ITAN stands for ......
Information Technology Association of Nigeria.
To communicate with your friend in Ghana, you would use .....
An e-mail address.
The computer equivalence of a sheet of paper divided into rows and columns is called .....
Spreadsheet.
The legal right that prevents stealing of intellectual property is called ......
Copyright.
ATM stands for ......
Automated Teller Machine.
Which of the following can bring enhanced learning experience to the classroom through the use of pictures, videos and sound is .....
Multimedia software combines pictures, video and sound.
The broad pre-historic time period about 50,000 - 10,000BC when humans had no technology is the .....
Stone age.
You get ...... when you calculate 4^2
4 squared = 16.
The feature that enables a surfer to fetch the latest of a web page is ......
Refresh reloads the page.
The management of communication between hardware and application software is done by a/an ......
The operating system.
Mr. Okon's daily duties include typing documents, connecting and printing documents. Mr. Okon is a/an ......
A computer operator.
Information can be transmitted through the following EXCEPT ....
The CPU processes data; it is not a transmission medium.
The oldest information age is the ...... age.
Stone age.
Identify a common fly that lays eggs on exposed food which are later hatched into maggots. It causes a particular disease called ......, and which part of its body are the legs located?
The housefly spreads cholera; insect legs are on the thorax.
Identify an aquatic animal that possesses gills for breathing. The primary body part for navigating and moving in its habitat are ......, and what part of human body performs the same function of the gills?
Fish have gills and fins; the lungs do the job of gills.
Mention a waxy whitish solid ball with a strong aroma used at home to repel cockroaches and ants in cabinets and storages. The changes this substance undergoes is from solid to ....., and mention the type of physical change that occurs when it is exposed to air for a period of time.
Camphor goes straight from solid to gas: sublimation.
Identify an historical baked food product prepared from a dough of flour and water. What class of food does it belong to? and what grows on the baked food when left for some days without eating it?
Bread is a carbohydrate; mould grows on it.
Which of the following matters are in their correct state? (Solid / Liquid / Gas)
Ice is a solid, kerosene a liquid, perfume (spray) a gas.
In a simple electric circuit, the positive terminal of a dry cell battery is joined with a wire to the ...... An electric bulb that is placed on the other end of the terminal with a wire converts electrical energy to ..... energy, and what is the function of the wire in the simple electric circuits?
The bulb converts electrical energy to light and the wire is a good conductor.
Select the appropriate skill from the options below for the under-listed Judo Sport activities. .....i..... involves holding an opponent with his or her back to the mat for 25 seconds. A full point scored in Judo Sport is called .....ii..... and, When an opponent is caused to submit by applying a reverse pressure across the elbow, this is called .....iii..... .
Hold-down for 25 seconds, Ippon is a full point, arm-lock across the elbow.
Fill the blanks below with their suitable terms from the skills in basket-ball game. A continuous motion that a player repeatedly bounces the ball off the floor with one hand is ....i...., ....ii.... involves throwing or sending the ball within a team-mate in order to prevent opponents from taking it, standing near an opponent while preventing from moving towards a desired location on the court is known as ....iii....., and using one's arm strength to throw a ball into a basket height speed from a long distance away is ....iv....
Dribbling, passing, defending, shooting.
Arrange the following from the lowest to the highest capacity: floppy disk, hard disc, CD, DVD
Floppy (1.44 MB), CD (700 MB), DVD (4.7 GB), hard disk (GB to TB).
The diagram above shows a food web in an eco-system. How many producers and consumers are in the system? (Producer / Consumer)
Grass is the only producer; grasshopper, lizard, hawk, rodents and snakes are the 5 consumers.
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