Primary Three - Science Sa2 (Mock)
(82).webp "Primary Three - Science Sa2 (Mock) - Quiz")
The exam which you're about to take is a primary three science year-end examination. The two main topics which will be tested are "Interactions" and "Diversity".
Questions and Answers
- 1.
A magnet is an object that can _______________ other magnetic materials.
- A.
Push
- B.
Pull
- C.
Attract
- D.
Repel
Correct Answer(s)
B. Pull
C. AttractExplanation
A magnet has the ability to exert a force on other magnetic materials. This force can either attract the materials towards the magnet or pull them closer to it. Therefore, the correct answer is "pull" and "attract".Rate this question:
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- 2.
Which of the following is a magnetic material?
- A.
Glass
- B.
Wood
- C.
Iron
- D.
Paper
- E.
Rubber
- F.
Plastic
- G.
Silver
Correct Answer
C. IronExplanation
Iron is a magnetic material because it contains iron atoms that have unpaired electrons, which create a magnetic field. When a magnetic field is applied to iron, the unpaired electrons align themselves with the field, causing the iron to become magnetized. This property makes iron useful in various applications, such as in the production of magnets and electromagnets.Rate this question:
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- 3.
Is copper a metal?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Copper is indeed a metal. It is a chemical element with the symbol Cu and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Copper is commonly used in electrical wiring, plumbing, and various industrial applications due to its excellent conductivity and corrosion resistance. Therefore, the statement "Copper is a metal" is true.Rate this question:
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- 4.
Is copper a magnetic material?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Copper is not a magnetic material. Unlike iron, nickel, and cobalt, copper does not possess strong magnetic properties. It is classified as a non-magnetic material because it does not attract or repel other magnetic objects. Copper is commonly used in electrical wiring and circuits due to its excellent conductivity, but it does not exhibit magnetic behavior.Rate this question:
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- 5.
All metals are magnetic materials.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement "All metals are magnetic materials" is incorrect. While some metals, such as iron and nickel, are magnetic, not all metals exhibit magnetic properties. For example, metals like copper and aluminum are not magnetic. Therefore, the correct answer is False.Rate this question:
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- 6.
What do the letters 'N' and 'S' stand for on a magnet? (Separate both answers with a comma, e.g. "N------------, S------------" and you need not type in the "pole")
Correct Answer
North, South
north, south
North, south
north, SouthExplanation
The letters 'N' and 'S' on a magnet stand for North and South respectively.Rate this question:
- 7.
Which parts of a magnet have the strongest attracting force?
- A.
The North pole.
- B.
The center.
- C.
The South pole.
- D.
All parts of the magnet have the same attracting force.
Correct Answer(s)
A. The North pole.
C. The South pole.Explanation
The North pole and the South pole of a magnet have the strongest attracting force. This is because opposite poles attract each other, causing a strong magnetic force between them. The center of the magnet does not have a stronger attracting force compared to the poles. Therefore, the correct answer is the North pole and the South pole.Rate this question:
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- 8.
Like poles causes 2 magnets to ________ each other.
Correct Answer(s)
repel
push away fromExplanation
When two magnets have like poles facing each other, they will repel each other. This means that they will push away from each other, creating a force that keeps them apart. The like poles of magnets have the same magnetic orientation, which causes the magnetic fields to interact and create a repulsive force between them. This phenomenon is a fundamental property of magnets and is commonly observed in everyday situations.Rate this question:
- 9.
When a magnet is broken into half, the North and South poles still remain in each broken magnet.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When a magnet is broken into half, the North and South poles still remain in each broken magnet. This is because magnets have a magnetic field that is created by the alignment of their atoms. Breaking a magnet into half does not change the alignment of the atoms, so each broken piece still retains its own North and South poles.Rate this question:
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- 10.
Name the 2 ways to make a magnet.
- 11.
What method is used in the following picture to make a magnet?
- A.
Electrical method
- B.
'Stroke' method
- C.
Others
Correct Answer
B. 'Stroke' methodExplanation
The 'Stroke' method is used to make a magnet in the given picture. This method involves stroking a piece of iron or steel with a magnet in order to align the magnetic domains within the material, thus creating a magnetic field. This process can be repeated multiple times to increase the strength of the magnet. The 'Stroke' method is a common and effective way to magnetize materials and is often used in industries and everyday applications.Rate this question:
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- 12.
Name 4 required things needed for the electrical method to work.
- 13.
Which of the following are uses of magnets by people in our daily lives?
- A.
Refrigerator doors
- B.
Doorstops
- C.
Televisions
- D.
Hole-punchers
- E.
MRT cards
- F.
Telephones
- G.
Computer disks
- H.
Keys
Correct Answer(s)
A. Refrigerator doors
B. Doorstops
C. Televisions
E. MRT cards
F. Telephones
G. Computer disksExplanation
Magnets are used in refrigerator doors to create a seal that keeps the cold air inside. Doorstops often contain magnets to hold the door open or closed. Magnets are used in televisions to direct the electron beam and create images on the screen. MRT cards, also known as subway or metro cards, often use magnetic strips to store information and allow for easy swiping. Some telephones use magnets in their speakers to convert electrical signals into sound waves. Computer disks, such as hard drives and floppy disks, use magnets to store and retrieve data. Keys may also have magnets in them for various purposes, such as attaching to a magnetic key holder.Rate this question:
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- 14.
Living things can be classified into 3 groups.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Living things can be classified into more than 3 groups. The classification of living things is done based on various criteria such as their cellular structure, mode of nutrition, and evolutionary relationships. The most commonly used classification system is the one that divides living things into five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia. Therefore, the statement that living things can be classified into only 3 groups is incorrect.Rate this question:
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- 15.
Which one of the following is a classification of living things?
- A.
Insects
- B.
Bacteria
- C.
Non-flowering plants
- D.
Fishes
Correct Answer
B. BacteriaExplanation
Bacteria is a classification of living things because it is a group of single-celled microorganisms that have a distinct cellular structure and can be found in various habitats. Bacteria are prokaryotes, meaning they lack a nucleus and membrane-bound organelles. They play crucial roles in various ecological processes, such as nutrient cycling, decomposition, and symbiotic relationships. Bacteria can be found in diverse environments, including soil, water, and the human body. They are an essential part of Earth's ecosystems and have a significant impact on the overall balance of life on our planet.Rate this question:
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- 16.
Give an example for each of the classified groups of living things.
- 17.
A dolphin is a fish.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement that a dolphin is a fish is false. Dolphins are actually mammals, not fish. They belong to the group of marine mammals known as cetaceans, which also includes whales and porpoises. Unlike fish, dolphins have lungs and breathe air, give live birth, and nurse their young with milk. They also have a more complex social structure and communication system compared to fish. Therefore, it is incorrect to classify dolphins as fish.Rate this question:
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- 18.
Not all birds can fly.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This statement is true because not all birds have the ability to fly. While many birds, such as eagles and sparrows, have the ability to fly, there are also several species of flightless birds, such as penguins and ostriches, that have evolved to live and move primarily on land. Therefore, it is accurate to say that not all birds can fly.Rate this question:
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- 19.
What is the similarity between mammals and fishes?
- A.
They are covered with fur.
- B.
Some mammals lay eggs while all fishes do.
- C.
They feed their young with milk.
- D.
Some fishes give birth to young while all mammals do.
Correct Answer
D. Some fishes give birth to young while all mammals do.Explanation
The similarity between mammals and fishes is that some fishes give birth to young while all mammals do. This means that both mammals and some fishes have the ability to reproduce by giving birth to live offspring. This is a characteristic that sets them apart from other animals, such as reptiles and birds, which typically lay eggs.Rate this question:
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- 20.
Ferns are fungi.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement "Ferns are fungi" is incorrect. Ferns are not fungi, but rather a type of vascular plant that reproduces via spores. Fungi, on the other hand, are a separate kingdom of organisms that includes mushrooms, yeasts, and molds.Rate this question:
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- 21.
Which of the following is not a plant?
- A.
Mosses
- B.
Yeasts
- C.
Rice
- D.
Palms
Correct Answer
B. YeastsExplanation
Yeasts are not considered plants because they belong to the kingdom Fungi. While plants are multicellular organisms that produce their own food through photosynthesis, yeasts are single-celled organisms that obtain nutrients by breaking down organic matter. They reproduce through a process known as budding, which is different from the reproductive methods of plants. Therefore, yeasts do not possess the typical characteristics and features of plants.Rate this question:
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- 22.
Which of the following is true?
- A.
Bacteria can be seen by using a magnifying glass
- B.
Bacteria can be seen by using a microscope
- C.
Bacteria can be seen by a naked eye
- D.
Bacteria can be seen by using a binocular.
Correct Answer
B. Bacteria can be seen by using a microscopeExplanation
Bacteria are microscopic organisms that cannot be seen with the naked eye or a magnifying glass. They are too small to be visible without the use of a microscope, which allows for magnification and enhanced visibility of these tiny organisms.Rate this question:
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- 23.
Not all bacteria are harmful.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Bacteria are a diverse group of microorganisms, and not all of them are harmful to humans. In fact, many bacteria are beneficial and play important roles in various ecological processes. Some bacteria help with digestion, produce vitamins, and even protect against harmful pathogens. Therefore, it is true that not all bacteria are harmful.Rate this question:
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- 24.
What material can be used to make a swimming float?
- A.
Rubber
- B.
Wood
- C.
Metal
- D.
Fabric
Correct Answer
A. RubberExplanation
Rubber is the correct answer because it is a buoyant material that can float on water. It is commonly used in the manufacturing of swimming floats due to its ability to provide flotation and support in the water. Rubber floats are lightweight, durable, and can easily be inflated or deflated as needed. Additionally, rubber is water-resistant, making it suitable for prolonged use in swimming pools or open water.Rate this question:
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- 25.
What materials can be used to make a slipper?
- A.
Rubber
- B.
Plastic
- C.
Glass
- D.
Ceramic
Correct Answer(s)
A. Rubber
B. PlasticExplanation
Rubber and plastic are suitable materials for making slippers because they are flexible, durable, and provide comfort to the wearer. Glass and ceramic are not commonly used for making slippers as they are rigid and can cause discomfort and injury.Rate this question:
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- 26.
Which object consists of more than 1 material?
- A.
Cloth
- B.
Clothes
- C.
Mineral water bottle
- D.
Spectacle
Correct Answer
D. SpectacleExplanation
Spectacles consist of more than one material because they are typically made with a combination of materials such as plastic, metal, and glass. The frame of the spectacles is usually made of plastic or metal, while the lenses are made of glass or plastic. Additionally, the hinges and screws used in the spectacles are often made of metal. Therefore, spectacles are an object that consists of more than one material.Rate this question:
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- 27.
What objects float on water?
- A.
Paper
- B.
Stone
- C.
Cork
- D.
Wood
- E.
Marble
- F.
Glass bottle
Correct Answer(s)
A. Paper
C. Cork
D. Wood
F. Glass bottleExplanation
Objects that float on water are typically less dense than water. Paper, cork, wood, and a glass bottle can all float on water because they have a lower density than water. These materials are less compact and have air pockets or empty spaces within them, making them buoyant enough to float on the surface of the water. Conversely, objects like stone, marble, and other dense materials have a higher density than water, causing them to sink.Rate this question:
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Dec 13, 2023Quiz Edited by
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Oct 15, 2010Quiz Created by
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