All 85 questions from the Junior Secondary Certificate Examination (JSCE) Basic Science 2024 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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In a group discussion, students were asked to compare an acid with a base. They concluded that ____
An acid and a base react together in a neutralization reaction.
Neutron exists in the atomic nucleus. One other component that also exists in the nucleus is ____.
The nucleus contains protons and neutrons.
The key to a classroom was discovered to have changed colour from silver to brown which indicates that rusting has taken place. How can this have been prevented?
Grease keeps out air and moisture, which stops rusting.
The following are the content of the air we breathe in around us EXCEPT ____.
Air is mainly nitrogen, oxygen and noble gases; hydrogen is not a normal constituent.
When two atoms of hydrogen react with one atom of oxygen to form water, the water represents ____ in the equation.
Water is formed, so it is the product.
(Diagram of a beaker with two electrodes marked + and -) The diagram above shows ____.
Two electrodes dipped in a solution make an electrochemical cell.
Elements and compounds can be represented by symbols. Choose one that represents an element from the options below:
H2 contains only one kind of atom, so it is an element.
All matter has a building block which is made up of ____.
Atoms are the building blocks of matter.
The joints found in your elbows, fingers, and knees are examples of which joint?
They move in one plane like a door hinge.
Victor touched a hot pot and quickly withdrew his hand. The stimulus is transferred from the receptor muscle to the central nervous system through the ____.
Sensory neurons carry impulses from receptors to the central nervous system.
1. Blood 2. Semen 3. Tears 4. Saliva. Above are fluids in the body; that produce the fluid that transmits HIV using the numbers.
HIV is carried mainly in blood and semen; tears and saliva do not transmit it. Closest option is 1 only.
An organ that works like a pumping machine in the body is the ____.
The heart pumps blood.
A monkey cannot be enrolled in a school, unlike humans who learn in schools. The major difference between monkey and human that enables man to attend school is they ____.
Humans have the largest and most developed brain for learning.
The first person to prove that pea plants have certain traits that come in pairs is ____.
Gregor Mendel worked on pea plants and heredity.
Rearrange the following to illustrate the organization of life. 1-Tissue 2-Cell 3-System 4-Organ 5-Organization
Cell, tissue, organ, system, organism.
The absence of rain for a long period of time occurs in the Northern part of Nigeria; this causes ____.
Prolonged drought leads to desertification.
A particular species of plant produces light non-sticky pollen in large numbers and its stigma is long with feathers. This modification facilitates pollination by ____.
Light pollen and feathery stigma are adaptations for wind pollination.
In digesting food, the pounded yam eaten by Josiah moves from the mouth to the oesophagus, then to the ____.
Food passes mouth, oesophagus, stomach.
Victor can jump, walk, swim, eat, skip, and hop using his ____.
Bones and muscles together produce movement.
(Diagram of white light passing through a prism and splitting into colours R O Y G B I V) The diagram shows which property of light?
Splitting of white light into its colours is dispersion.
Benjamin puts on the generator in his house at 7pm. The generator converts ____ energy to electrical energy.
A generator converts mechanical energy to electrical energy.
We see objects mainly because they ____.
Light reflected from objects enters our eyes.
The earth is similar to a magnet in operation because ____.
Both have north and south poles.
The order through which sound travels through our ear to our brain is ____. I. Pinna II. Auditory nerve III. Eardrums IV. Cochlear V. Ossicles
Pinna, eardrum, ossicles, cochlea, auditory nerve.
(Diagram of two cans of water in the sun, T1 in can A and T2 in can B.) Two cans containing equal amounts of water were placed in the sun for hours. Can A is silver coloured and can B is painted black. The first water to get hot is ____.
Black surfaces absorb heat radiation best.
The structure below represents an element (14 over 7 N). Calculate the number of protons in the element.
The lower number (7) is the atomic number, which equals the protons.
The structure below represents an element (14 over 7 N). Calculate the number of neutrons in the element.
Neutrons = mass number - atomic number = 14 - 7 = 7.
When you hit a metal tank, sound travels a longer distance through it. Justify the reason.
Closely packed particles pass vibrations on quickly in solids.
Daniel boiled water in an electric kettle, the water became hot by ____ process.
Heated water rises and cooler water sinks, forming convection currents.
A magnet attracts objects to itself but not all objects are attracted. The type of material a magnet attracts or pulls is ____.
Magnets attract magnetic metals such as iron.
Corrective maintenance can also be referred to as ____.
Corrective maintenance is done after a fault, so it is reactive.
Which of the following is an impelling tool?
A hammer drives or impels nails.
The production manager of a rubber processing company ordered that sulphur should be heated with raw rubber to make their products stronger and more durable. He called the process ____.
Heating rubber with sulphur is vulcanisation.
When a tree is cut down, both the internal and external parts are exposed and one of the internal parts is the ____.
Sapwood is inside the trunk.
The two types of current are ____ and ____.
The two types are alternating current and direct current.
Metals that shine when polished have the ____ property.
Lustre is the shiny appearance of metals.
Which of the following is a source of alternating current?
A generator produces alternating current.
Which of the following is NOT a triangle?
Reflex is a type of angle, not a triangle.
The radius of a circle is Xcm. What is its diameter?
Diameter = 2 x radius.
A regular polygon is identified by ____.
A regular polygon has all sides and angles equal.
A good advantage of a pneumatic system over a hydraulic is; its ____.
Pneumatic systems are simple and reliable.
A good example of the application of rack and pinion is seen in a/an ____.
Steering systems in automobiles use rack and pinion.
The major advantage of chain drives over belt drives is ____.
Chain drives do not slip and can carry heavier loads.
A mining industry dug out iron ore and sent it for processing in a metallurgical industry. Which of the following furnaces will be first used to separate the iron ore from impurities?
Iron ore is first smelted in the blast furnace.
Which of the following is not a good property of ceramics?
Ceramics resist heat and weather well.
Which of the following is the next stage after setting-out?
Site clearing, setting-out, then excavation.
A drawing at a scale of 1:25 means that the object is ____.
1:25 means the drawing is 25 times smaller than the real object.
Orthographic projection is regarded as 'working drawing' because ____.
It gives several 2D views with exact dimensions.
The major difference between isometric and oblique drawing is that oblique drawing has ____.
Oblique drawing shows the front face in true shape.
A group of students were arguing over the following combinations of careers in engineering and technology, who among them was wrong?
Sociology is not an engineering or technology career.
Godwin Luck happens to win the toss for the tennis game and begins the game by putting the ball to play. Berry is the ____ while his opponent is ____.
The one who starts the point is the server; the other is the returner.
The collection of supplies and equipment that is used to give medical treatment is called ____.
It is a first aid box.
A healthy school environment promotes the following EXCEPT ____.
Rivalry does not promote a healthy school.
The proper grip for a forehand shot in tennis is known as the ____ grip.
The eastern grip is the standard forehand grip.
During a match, it's essential to maintain proper ____ to conserve energy and read quickly to the opponent's shots.
Good footwork saves energy and helps you reach shots.
One of these gymnastics activities can be performed without apparatus.
A backward roll is done on the floor with no apparatus.
When a served ball touches the net and drops at the server's side of the table, it is ____
A ball that touches the net on service is a let.
A team must not hit the ball beyond ____ times before passing it to a opponent court in a volleyball game.
A volleyball team is allowed at most three touches.
A player throws a racket at the ball and it hits the net before landing in an opponent's court. The ball is called ____
A ball touching the net and landing in is a let.
Water is known as a basic necessity that sustains all life. Which one of these is preferable to be used for human consumption?
Natural sources such as springs and underground water are cleaner.
(Diagram of a field-event pitch with a throwing circle and a marked sector) The above diagram is a pitch for a field event called ____.
A circle with a stop board and a landing sector is the shot put pitch.
Physical education is the integral part of education that develops learners' overall health through selected physical activities with all these as its objectives EXCEPT ____.
Physical, social and mental development are objectives; performance development is not.
In jumping events, we have the long jump which has 2 commands "step and jump" while triple has ____
The triple jump consists of the hop, step and jump phases.
The Yoruba cultural dance can be categorised under which classes of dance?
A cultural dance of a people is a folk or traditional dance.
The Physical Fitness training that involves a series of exercises arranged into different stations which performers engage in from one station to another is ____.
Moving from station to station is circuit training.
The act of striking the ball with the face of the stick to make it move to a long distance in a hockey game is ____.
A drive is a long hit with the face of the stick.
The athletic activity involving an athlete performing some track and field events to test his/her all-round ability is ____.
Combined events test an athlete's all-round ability.
When the body takes in food and utilizes it properly, it is known as ____.
Nutrition is taking in and using food properly.
When two players pass the ball (egg) to one another in a tennis game for a long period nonstop, it is called ____ in tennis terminology.
A long exchange of shots is a rally.
If Physical Education is aimed at improving the physical, mental, emotional and social aspects of an individual, then Health Education is an activity that ____ of an individual.
Health education improves the health aspect of an individual.
Which of the following best describes a search engine?
A search engine helps users find information on the web.
Multidirectional keys on the keyboard are also known as ____.
The four arrow keys point in different directions.
BCC in email context stands for ____.
BCC means blind carbon copy.
GUI stands for ____.
GUI means graphical user interface.
The primary function of a search engine is ____.
Its main job is to find and retrieve information on the internet.
The loud ringtone of a mobile phone device causes the following EXCEPT ____.
Loud sound affects the ears and head, not the eyes.
ENIAC was the first ____.
ENIAC was the first general-purpose electronic computer.
Search engines generate search results by ____.
They index pages and rank them by relevance.
The Pascals machine was made by ____.
Blaise Pascal made the Pascaline.
Malicious programs that infect a computer are ____.
Viruses are malicious programs that infect computers.
Which of the following is NOT a popular search engine?
Facebook is a social network.
Games such as flight simulations are played using ____.
A joystick controls flight simulators.
An embedded computer can be found in a ____.
Embedded computers are built into appliances like washing machines.
When an image is copied, it goes to the ____ first.
Copied items are held on the clipboard.
A standard QWERTY keyboard contains ____ keys.
A standard keyboard has 104 keys.
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