# Science Week 12, Level G

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Latifa
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Quizzes Created: 4 | Total Attempts: 331
Questions: 22 | Attempts: 49

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• 1.

### An object that attracts certain magnetic materials, such as iron and steel is called a [____________]. e.g. to identify black steel marbles from black glass marbles, use a magnet since a magnet can attract steel but it cannot attract glass

Explanation
A magnet is an object that has the ability to attract certain magnetic materials such as iron and steel. It creates a magnetic field around itself which can exert a force on other magnetic objects, pulling them towards it. This property of magnets is used to identify materials that are attracted to it, like steel, from materials that are not, like glass. In the given example, a magnet is used to differentiate between black steel marbles and black glass marbles, as the magnet can attract the steel marbles but not the glass marbles.

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• 2.

### The end of each magnet is called magnetic [_____].

Explanation
The end of each magnet is called a pole.

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• 3.

### All magnets have [_____] different poles: a north pole noted N and a south pole noted S.

Explanation
Magnets have two different poles, a north pole (N) and a south pole (S). These poles are opposite in nature and attract each other. This property of magnets is fundamental and is observed in all magnets.

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• 4.

### [_________] poles attract (pull) each other. [_______] poles repel (push away) each other. ï‚· The north pole of one magnet and the south pole of another magnet will [_______] each other. ï‚· The north pole of one magnet and the north pole of another magnet will [________] each other

Explanation
Opposite poles attract each other because they have opposite magnetic charges, causing them to be drawn together. Like poles repel each other because they have the same magnetic charges, creating a force that pushes them away from each other.

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• 5.

### The area around a magnet in which its magnetic effects can be observed is a [____________]. e.g. For an iron object to be attracted by a magnet it should be placed within the magnetic field of the magnet.

Explanation
The area around a magnet where its magnetic effects can be observed is called a magnetic field. This field is responsible for attracting or repelling other magnetic objects within its range. In the example given, an iron object can only be attracted by a magnet if it is placed within the magnetic field of the magnet. The magnetic field is the region where magnetic forces are present and can be detected.

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• 6.

### Since the magnetic field of a magnet cannot be seen, to locate it we sprinkle small bits of [_______] around the magnet

Explanation
To locate the magnetic field of a magnet, we sprinkle small bits of iron around it. Iron is attracted to magnets and will align itself with the magnetic field lines, making it visible and allowing us to locate the magnet.

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• 7.

### An electric wire carrying an electric current can produce a [________] magnetic field. To make the magnetic field produced by the wire stronger, wrap the wire around an iron nail.

Explanation
When an electric current flows through a wire, it generates a magnetic field around the wire. This magnetic field is typically weak. However, by wrapping the wire around an iron nail, the magnetic field can be strengthened. This is because iron is a ferromagnetic material, meaning it can easily magnetize and amplify the magnetic field produced by the current. Therefore, by using an iron nail, the magnetic field produced by the wire becomes stronger.

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• 8.

### When a wire that carries an electric current is wrapped around an iron rod, an [_________] is built.

Explanation
When a wire that carries an electric current is wrapped around an iron rod, an electromagnet is built. This is because the electric current flowing through the wire creates a magnetic field. The iron rod, being a ferromagnetic material, becomes magnetized in the presence of this magnetic field. As a result, the iron rod becomes an electromagnet, capable of attracting and holding magnetic objects. The strength of the electromagnet can be increased by increasing the number of wire turns or the amount of current flowing through the wire.

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• 9.

### The main difference between an electromagnet and a regular magnet is a regular magnet is [__________] while an [_____________] can be turned on and off.

Explanation
An electromagnet is different from a regular magnet because it can be turned on and off, whereas a regular magnet is always on. This is because an electromagnet is created by passing an electric current through a coil of wire, which generates a magnetic field. By controlling the flow of electricity, the magnetic field can be either activated or deactivated, allowing the electromagnet to be turned on and off as needed.

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• 10.

### When the number of coils around the iron rod is increased, the electromagnet becomes [________].

Explanation
When the number of coils around the iron rod is increased, the electromagnet becomes stronger. This is because increasing the number of coils increases the number of turns of wire, which in turn increases the magnetic field produced. The magnetic field is directly proportional to the number of turns of wire, so more coils result in a stronger electromagnet.

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• 11.

### To increase the strength of electromagnet without changing the number of coils, we can increase the [______________] passing through the wire using a stronger battery.

Explanation
To increase the strength of an electromagnet without changing the number of coils, we can increase the electric current passing through the wire using a stronger battery. This is because the strength of an electromagnet is directly proportional to the amount of electric current flowing through it. By increasing the electric current, we increase the magnetic field produced by the electromagnet, thus increasing its strength.

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• 12.

### When the current passing through the circuit is decreased, the electromagnet becomes [_______].

Explanation
When the current passing through the circuit is decreased, the electromagnet becomes weaker. This is because the strength of an electromagnet is directly proportional to the amount of current flowing through its coils. When the current is decreased, there is a decrease in the magnetic field produced by the electromagnet, resulting in a weaker overall magnetic force.

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• 13.

### A strong [__________] is used to separate metal scraps from other materials in a junkyard

Explanation
An electromagnet is a strong magnet created by passing an electric current through a coil of wire. In the context of a junkyard, an electromagnet can be used to separate metal scraps from other materials. When the electric current flows through the coil, it generates a magnetic field, which attracts the metal scraps and allows them to be easily separated from the rest of the materials. This makes the process of sorting and recycling metal scraps more efficient and effective.

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• 14.

### In a junkyard, an electromagnet is turned on to [_________] metals from a scrap pile, then it is turned off to [________] the metals into another pile (unlike a regular magnet that is always on).

Explanation
In a junkyard, an electromagnet is turned on to attract metals from a scrap pile, then it is turned off to release the metals into another pile. Unlike a regular magnet that is always on, the electromagnet can be controlled by turning it on and off, allowing for easy collection and separation of the metals in the junkyard.

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• 15.

### An [_____________] is used to produce a ringing sound in an alarm bell

Explanation
An electromagnet is used to produce a ringing sound in an alarm bell because it can create a magnetic field when an electric current passes through it. This magnetic field attracts a metal striker, which is then released to strike the bell and produce the ringing sound. The electromagnet provides the necessary force and movement to create the audible alarm.

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• 16.

### The electromagnet in an alarm bell moves the [_____________] that hits the bell repeatedly and fast.

Explanation
The electromagnet in an alarm bell moves the hammer that hits the bell repeatedly and fast. The electromagnet creates a magnetic field when electricity flows through it, which attracts the hammer towards it. As the electromagnet is turned on and off rapidly, the hammer is repeatedly pulled towards it and then released, causing it to hit the bell in a fast and repetitive motion, creating the ringing sound of the alarm bell.

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• 17.

### An electromagnet is turned on to [___________] a hammer towards the metal ball and produce a sound, then it is turned off to repeat the cycle and produce a ringing sound.

Explanation
When an electromagnet is turned on, it produces a magnetic field that attracts objects made of magnetic materials, such as the hammer in this case. By attracting the hammer towards the metal ball, the electromagnet causes them to collide and produce a sound. Once the electromagnet is turned off, the magnetic attraction is no longer present, allowing the hammer to move away from the metal ball and repeat the cycle, producing a ringing sound.

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• 18.

### A _________ circuit has a single pathway for the charges to flow through (the electric charges can pass through one path only).e.g. in the circuit below the devices of the circuit that receive current electricity are the three light bulbs

Explanation
In a series circuit, the components are connected one after the other, forming a single pathway for the charges to flow through. The current flowing through each component is the same, as there are no other paths for the charges to take. In the given circuit, the three light bulbs are connected in series, meaning that the electric charges can pass through them one after the other.

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• 19.

### When a device is broken in a series circuit, it causes a ___________ in the electric path (all the bulbs will be off)

Explanation
When a device is broken in a series circuit, it causes a gap in the electric path. This means that the flow of electricity is interrupted and cannot continue through the circuit. As a result, all the bulbs connected in the circuit will be turned off because there is no longer a complete path for the electricity to flow through.

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• 20.

### A circuit that has more than one path for the electric charges to flow through is a _________ _________. e.g. In the circuit below, the electric charges can pass through three paths.

Explanation
A parallel circuit is a circuit that has more than one path for the electric charges to flow through. In this type of circuit, the components are connected in such a way that the current has multiple paths to follow. In the given example, the electric charges can pass through three different paths, indicating that it is a parallel circuit.

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• 21.

### We use __________ circuits to allow the devices to function separately (e.g. To control each lamp while not affecting the other)

Explanation
Parallel circuits are used to allow devices to function separately because in a parallel circuit, each device is connected to the power source through its own separate branch. This means that the current can flow through each device independently, allowing them to operate individually without affecting the others. In the case of controlling lamps, each lamp can be connected in parallel to the power source, allowing them to be controlled individually without affecting the other lamps in the circuit.

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• 22.

### When a device is broken in a __________ circuit, it does not affect the current in other devices

Explanation
In a parallel circuit, the devices are connected to the same voltage source but have separate branches. Each device has its own current path, so when one device is broken, it does not interrupt the flow of current in the other devices. The current can still flow through the other branches and devices without any disruption. Therefore, the current in other devices remains unaffected when a device is broken in a parallel circuit.

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