Electricity And Magnetism Post-test Wolf

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fourth grade pretest trimester three Magnetism and electricity

• 1.

To pull toward one another, as opposite poles of two magnets pull toward one another.

• A.

Push

• B.

Attract

• C.

Magnetic field

• D.

Repel

B. Attract
Explanation
When two magnets have opposite poles, they exhibit a force of attraction towards each other. This force is similar to the force of gravity, where objects are pulled towards each other. The term "attract" accurately describes this phenomenon, as it implies the pulling or drawing together of the magnets.

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• 2.

A pathway for the flow of electricity

• A.

Static

• B.

Switch

• C.

Circuit

• D.

Technology

C. Circuit
Explanation
A circuit is a pathway for the flow of electricity. It is a closed loop that allows the current to flow from a power source to a load and back. In a circuit, various components such as resistors, capacitors, and switches are connected together to control the flow of electricity. By completing the circuit, electricity can flow continuously, enabling the operation of electrical devices. Therefore, circuit is the correct answer as it best describes the pathway for the flow of electricity.

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• 3.

A complete circuit through which electricity flows

• A.

Closed circuit

• B.

Series

• C.

Magnet

• D.

Lightning

A. Closed circuit
Explanation
A closed circuit is a complete pathway that allows electricity to flow continuously. It means that all the components in the circuit are connected in such a way that there are no breaks or gaps, ensuring the current can flow without interruption. In a closed circuit, the electricity flows from the power source, passes through various components such as resistors or switches, and returns back to the source. This allows for the efficient transfer of electrical energy and enables devices to function properly.

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• 4.

An individual item in a circuit

• A.

Key

• B.

Patent

• C.

Pole

• D.

Component

D. Component
Explanation
A component refers to an individual item in a circuit. It is a part or element that is essential for the functioning of the circuit. Components can include resistors, capacitors, transistors, diodes, and other electronic devices. Each component has a specific role and contributes to the overall operation of the circuit. Therefore, out of the given options, "component" is the term that accurately describes an individual item in a circuit.

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• 5.

A substance, commonly a metal such as copper or aluminum, through which electricity will flow.

• A.

Conductor

• B.

Prediction

• C.

Telegraph

• D.

Switch

A. Conductor
Explanation
A conductor is a substance, typically a metal like copper or aluminum, that allows electricity to flow through it. It has low resistance to the flow of electric current, making it an efficient material for transmitting electricity. Conductors are commonly used in electrical wiring and circuits to transfer electrical energy from one point to another. They play a crucial role in enabling the efficient transmission and distribution of electricity in various applications, such as power grids, electronic devices, and electrical systems.

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• 6.

The flow of electricity through a conductor

• A.

Filament

• B.

Force

• C.

Current

• D.

Detector

C. Current
Explanation
The flow of electricity through a conductor is referred to as current. Current is the movement of electric charge, typically carried by electrons, in a specific direction. It is measured in units called amperes (A). The flow of current is essential for the functioning of electrical devices and circuits, as it allows the transfer of energy and the generation of various electrical effects.

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• 7.

Something that helps you identify or locate something

• A.

Lodestone

• B.

Series

• C.

Electricity

• D.

Detector

D. Detector
Explanation
A detector is something that helps you identify or locate something. In this context, a detector can be used to identify or locate something related to the series, electricity, or a lodestone. It is a device that is designed to detect or sense certain substances, energies, or signals, and can be used in various fields such as science, technology, or security.

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• 8.

A form of energy that can produce light, heat, and magnetism.

• A.

Electricity

• B.

Code

• C.

Closed

• D.

Open

A. Electricity
Explanation
Electricity is a form of energy that can produce light, heat, and magnetism. It is the flow of electrical charge through a conductor, such as a wire. When this flow of charge is harnessed, it can be used to power various devices and appliances, generating light and heat. Additionally, electricity can create magnetic fields and be used to generate electromagnetism. Therefore, electricity is the correct answer as it encompasses all the mentioned characteristics.

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• 9.

A component that uses the electricity from a source to make something happen.

• A.

Intersection

• B.

• C.

Key

• D.

Patent

Explanation
An electricity receiver is a component that utilizes the electricity from a source to initiate or cause a specific action or event. It acts as a recipient of electrical energy and converts it into a desired form of output or functionality. This could include devices such as motors, lights, or any other electrical appliance that requires electricity to operate.

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• 10.

Something that provides electric energy to make something happen.

• A.

Magnetism

• B.

Repel

• C.

Telegraph

• D.

Electricity source

D. Electricity source
Explanation
An electricity source is something that provides electric energy to make something happen. In this context, it refers to a device or system that generates or supplies electricity, such as a battery, power plant, or generator. This answer is the most relevant and accurate explanation among the given options as magnetism and repel are not directly related to the concept of providing electric energy, and telegraph is a communication system rather than an electricity source.

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• 11.

A push or a pull.

• A.

Force

• B.

Battery

• C.

Coil

• D.

Core

A. Force
Explanation
The given options - battery, coil, and core - are not related to the concept of a push or a pull. However, force is the correct answer because it is the term used to describe a push or a pull that can cause an object to accelerate, decelerate, or change direction.

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• 12.

The influence of a permanent magnet’s magnetic field on a piece of iron, which makes the iron act like a magnet.

• A.

Compass

• B.

Filament

• C.

Induced magnetism

• D.

Gap

C. Induced magnetism
Explanation
When a permanent magnet is brought near a piece of iron, the magnetic field of the magnet aligns the magnetic domains in the iron, causing it to become temporarily magnetized. This temporary magnetization is known as induced magnetism. The iron behaves like a magnet as long as it is in the presence of the permanent magnet.

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• 13.

A material that prevents the flow of electricity, commonly plastic, rubber, glass, or air.

• A.

Switch

• B.

Magnet

• C.

Gap

• D.

Insulator

D. Insulator
Explanation
An insulator is a material that does not allow the flow of electricity. It can be made of various substances such as plastic, rubber, glass, or even air. Insulators are used to prevent the transfer of electrical current and to provide safety in electrical systems. They have high resistance to the flow of electrons, which helps in keeping the electricity contained within the desired path.

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• 14.

An object that sticks to iron

• A.

Magnet

• B.

Code

• C.

Filament

• D.

Insulator

A. Magnet
Explanation
The correct answer is "magnet" because a magnet is an object that sticks to iron. Magnets have the ability to attract and stick to ferromagnetic materials such as iron, nickel, and cobalt. This is due to the presence of magnetic fields generated by the magnet, which causes the iron to be attracted and stick to it. Magnets are commonly used in various applications such as in compasses, electric motors, and refrigerator magnets.

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• 15.

An incomplete circuit through which electricity will not flow.

• A.

Graph

• B.

Key

• C.

Open circuit

• D.

Pole

C. Open circuit
Explanation
An open circuit refers to an incomplete circuit where there is a gap or break in the path, preventing the flow of electricity. In such a circuit, the current cannot pass through and complete the loop. This can occur when a switch is turned off or when there is a disconnected wire. Without a closed loop, the electrical energy cannot be transferred from the source to the load, resulting in no flow of electricity.

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• 16.

A circuit that splits into two or more pathways before coming together at the battery.

• A.

Magnet

• B.

Static

• C.

Parallel circuit

• D.

Electricity

C. Parallel circuit
Explanation
A parallel circuit is a type of circuit that splits into two or more pathways before coming together at the battery. In a parallel circuit, each pathway has its own branch that connects to the battery, allowing multiple devices or components to be connected independently. This means that if one device or component fails, the others will still continue to function. Parallel circuits are commonly used in homes and buildings to power multiple appliances or lights simultaneously.

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• 17.

To push away, as similar poles of two magnets push away from one another.

• A.

Attract

• B.

Switch

• C.

Graph

• D.

Repel

D. Repel
Explanation
When two magnets have similar poles facing each other, they repel each other. This means that they push away from one another. This phenomenon occurs because the magnetic fields of the two magnets interact in such a way that they create a force of repulsion between them. Therefore, the correct answer is "repel."

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• 18.

A circuit with only one pathway for current flow.

• A.

Intersection

• B.

Series circuit

• C.

Switch

• D.

Static

B. Series circuit
Explanation
A series circuit is a circuit that has only one pathway for current flow. In a series circuit, the components are connected one after another, forming a single loop. This means that the current passing through each component is the same. If one component in a series circuit fails, the entire circuit will be interrupted and no current will flow. Therefore, a series circuit fits the description of a circuit with only one pathway for current flow.

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• 19.

Positive and negative electric charges that are separated from each other and are not moving.

• A.

Gap

• B.

Circuit

• C.

Parallel

• D.

Static electricity

D. Static electricity
Explanation
Static electricity refers to the accumulation of electric charges on an object that is not in motion. When positive and negative charges are separated and not moving, they create an electric field. This phenomenon is commonly observed when rubbing certain materials together, causing the transfer of electrons and resulting in an imbalance of charges. The charges remain static until they are discharged or grounded. Static electricity can cause objects to attract or repel each other and can lead to small shocks or sparks when discharged.

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• 20.

A piece of iron that behaves like a magnet when it is touching a permanent magnet.

• A.

Temporary magnet

• B.

Nail

• C.

Repel

• D.

Switch

A. Temporary magnet
Explanation
A piece of iron can behave like a magnet when it is in contact with a permanent magnet because the iron becomes temporarily magnetized. This occurs through a process called magnetic induction, where the magnetic field of the permanent magnet aligns the magnetic domains within the iron, causing it to exhibit magnetic properties. However, once the iron is no longer in contact with the permanent magnet, it loses its magnetism and returns to its original state.

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