Test: Current Electricity- Case Based Type Questions


15 Questions MCQ Test Physics Class 12 | Test: Current Electricity- Case Based Type Questions


Description
This mock test of Test: Current Electricity- Case Based Type Questions for Class 12 helps you for every Class 12 entrance exam. This contains 15 Multiple Choice Questions for Class 12 Test: Current Electricity- Case Based Type Questions (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Current Electricity- Case Based Type Questions quiz give you a good mix of easy questions and tough questions. Class 12 students definitely take this Test: Current Electricity- Case Based Type Questions exercise for a better result in the exam. You can find other Test: Current Electricity- Case Based Type Questions extra questions, long questions & short questions for Class 12 on EduRev as well by searching above.
QUESTION: 1

Read the following text and answer the following questions on the basis of the same:

Electric Toaster : Small Industries Service Institute Takyelpat Industrial Estate Imphal has designed an Electric toaster which is operated at 220 volts A.C., single phase and available in four different rated capacity such as 600 W, 750 W, 1000 W and 1250 W.

The heating element is made of nichrome 80/20 (80% nickel, 20% chromium), since Nichrome does not get oxidise readily at high temperature and have higher resistivity, so it produces more heat. The element is wound separately on Mica sheets and fitted with body of toaster with the help of ceramic terminals.

Heating element of the toaster is made of:

Solution: The heating element is made of nichrome 80/20 (80% nickel, 20% chromium).
QUESTION: 2

Read the following text and answer the following questions on the basis of the same: Electric Toaster : Small Industries Service Institute Takyelpat Industrial Estate Imphal has designed an Electric toaster which is operated at 220 volts A.C., single phase and available in four different rated capacity such as 600 W, 750 W, 1000 W and 1250 W. The heating element is made of nichrome 80/20 (80% nickel, 20% chromium), since Nichrome does not get oxidise readily at high temperature and have higher resistivity, so it produces more heat. The element is wound separately on Mica sheets and fitted with body of toaster with the help of ceramic terminals.

Which one will consume more electricity?

Solution: Electricity consumption is measured by kWH. So, 1200W toaster will consume more electricity.
QUESTION: 3

Read the following text and answer the following questions on the basis of the same: Electric Toaster : Small Industries Service Institute Takyelpat Industrial Estate Imphal has designed an Electric toaster which is operated at 220 volts A.C., single phase and available in four different rated capacity such as 600 W, 750 W, 1000 W and 1250 W. The heating element is made of nichrome 80/20 (80% nickel, 20% chromium), since Nichrome does not get oxidise readily at high temperature and have higher resistivity, so it produces more heat. The element is wound separately on Mica sheets and fitted with body of toaster with the help of ceramic terminals.

Insulating materials used in the device are:

Solution: The element is wound separately on Mica sheets and fitted with body of toaster with the help of ceramic terminals.
QUESTION: 4

Read the following text and answer the following questions on the basis of the same:

Shunt resistance: The ammeter shunt is the device which provides the low resistance path to the flow of current. It is connected in parallel with the ammeter. In some ammeter the shunt is in-built inside the instrument while in others it is externally connected to the circuit. Ammeters are designed for measurement of low current. For measuring high current, the shunt is connected in parallel to the ammeter. The significant portion of the current passes to the shunt because of the low resistance path and little amount of current passes through the ammeter. The shunt is connected in parallel to the ammeter because of which the voltage drops across the meter and shunt remain the same. Thus, the movement of the pointer is not affected by the shunt. Let us consider that the current to be measured is I. The circuit has ammeter and shunt connected parallel to each other. The ammeter is designed for measurement of small current say, Im. The magnitude of the current I passes through the meter is very high, and it will burn the meter. So, for measuring the current I the shunt is required in the circuit. As the shunt connects in parallel with the ammeter, thus the same voltage drops occur between them:

IShRSH = ImRm

∴ RSH = ImRm/ISH

Shunt current ISH = I – Im

So, RSH = ImRm/(I – Im)

∴ I/Im = 1 + (Rm/RSH)

The ratio of the total current to the current required for the movement of the ammeter coil is called the multiplying power of the shunt.

∴ The multiplying power = m = I/Im

RSH = Rm / (m – 1)

The following are the requirements of the shunt.

• The resistance of the shunt should remain constant with time.

• The temperature of the material should remain the same even though substantial current flows through the circuit.

Manganin and Constantan are used for making the shunt of DC and AC ammeter respectively. What is multiplying power of the shunt?

Solution: As the shunt connects in parallel with the ammeter, thus the same voltage drop occurs between them. The ratio of the total current to the current requires the movement of the ammeter coil is called the multiplying power of the shunt.
QUESTION: 5

Read the following text and answer the following questions on the basis of the same:

Shunt resistance: The ammeter shunt is the device which provides the low resistance path to the flow of current. It is connected in parallel with the ammeter. In some ammeter the shunt is in-built inside the instrument while in others it is externally connected to the circuit. Ammeters are designed for measurement of low current. For measuring high current, the shunt is connected in parallel to the ammeter. The significant portion of the current passes to the shunt because of the low resistance path and little amount of current passes through the ammeter. The shunt is connected in parallel to the ammeter because of which the voltage drops across the meter and shunt remain the same. Thus, the movement of the pointer is not affected by the shunt. Let us consider that the current to be measured is I. The circuit has ammeter and shunt connected parallel to each other. The ammeter is designed for measurement of small current say, Im. The magnitude of the current I passes through the meter is very high, and it will burn the meter. So, for measuring the current I the shunt is required in the circuit. As the shunt connects in parallel with the ammeter, thus the same voltage drops occur between them:

IShRSH = ImRm

∴ RSH = ImRm/ISH

Shunt current ISH = I – Im

So, RSH = ImRm/(I – Im)

∴ I/Im = 1 + (Rm/RSH)

The ratio of the total current to the current required for the movement of the ammeter coil is called the multiplying power of the shunt.

∴ The multiplying power = m = I/Im

RSH = Rm / (m – 1)

The following are the requirements of the shunt.

• The resistance of the shunt should remain constant with time.

• The temperature of the material should remain the same even though substantial current flows through the circuit.

Current through shunt is

Solution: A shunt is an electrical device that generates a low-resistance path for an electrical current. This enables the current to flow to an alternative point in the circuit. Shunts may also be referred to as ammeter shunts or current shunt resistors.
QUESTION: 6

Read the following text and answer the following questions on the basis of the same:

Shunt resistance: The ammeter shunt is the device which provides the low resistance path to the flow of current. It is connected in parallel with the ammeter. In some ammeter the shunt is in-built inside the instrument while in others it is externally connected to the circuit. Ammeters are designed for measurement of low current. For measuring high current, the shunt is connected in parallel to the ammeter. The significant portion of the current passes to the shunt because of the low resistance path and little amount of current passes through the ammeter. The shunt is connected in parallel to the ammeter because of which the voltage drops across the meter and shunt remain the same. Thus, the movement of the pointer is not affected by the shunt. Let us consider that the current to be measured is I. The circuit has ammeter and shunt connected parallel to each other. The ammeter is designed for measurement of small current say, Im. The magnitude of the current I passes through the meter is very high, and it will burn the meter. So, for measuring the current I the shunt is required in the circuit. As the shunt connects in parallel with the ammeter, thus the same voltage drops occur between them:

IShRSH = ImRm

∴ RSH = ImRm/ISH

Shunt current ISH = I – Im

So, RSH = ImRm/(I – Im)

∴ I/Im = 1 + (Rm/RSH)

The ratio of the total current to the current required for the movement of the ammeter coil is called the multiplying power of the shunt.

∴ The multiplying power = m = I/Im

RSH = Rm / (m – 1)

The following are the requirements of the shunt.

• The resistance of the shunt should remain constant with time.

• The temperature of the material should remain the same even though substantial current flows through the circuit.

What will be the value of the shunt resistance if the ammeter coil resistance is 1Ω and multiplying power is 100?

Solution: RSH = Rm / (m – 1) = 1/(100 – 1) = 1/99Ω
QUESTION: 7

Read the following text and answer the following questions on the basis of the same:

Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrome) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.

Carbon composition resistors are made from a mixture of

Solution: Carbon Composition Resistors are manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together.
QUESTION: 8

Read the following text and answer the following questions on the basis of the same:

Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrome) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.

Metal Film Type Resistors are generally made by depositing pure ______, on ______ rod or substrate.

Solution: Metal Film Type Resistors are generally made by depositing pure metals, such as nickel on an insulating ceramic rod or substrate.
QUESTION: 9

Read the following text and answer the following questions on the basis of the same:

Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrome) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.

Wire wound resistors are available in very ____ ohmic high precision values with ______ power rating.

Solution: Wirewound Resistors are generally only available in very low ohmic high precision values. They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.
QUESTION: 10

Read the following text and answer the following questions on the basis of the same: Electric Toaster : Small Industries Service Institute Takyelpat Industrial Estate Imphal has designed an Electric toaster which is operated at 220 volts A.C., single phase and available in four different rated capacity such as 600 W, 750 W, 1000 W and 1250 W. The heating element is made of nichrome 80/20 (80% nickel, 20% chromium), since Nichrome does not get oxidise readily at high temperature and have higher resistivity, so it produces more heat. The element is wound separately on Mica sheets and fitted with body of toaster with the help of ceramic terminals.

What is meant by 80/20 Nichrome?

Solution: Nichrome 80/20 means an alloy of 80% nickel, 20% chromium.
QUESTION: 11

Read the following text and answer the following questions on the basis of the same: Electric Toaster : Small Industries Service Institute Takyelpat Industrial Estate Imphal has designed an Electric toaster which is operated at 220 volts A.C., single phase and available in four different rated capacity such as 600 W, 750 W, 1000 W and 1250 W. The heating element is made of nichrome 80/20 (80% nickel, 20% chromium), since Nichrome does not get oxidise readily at high temperature and have higher resistivity, so it produces more heat. The element is wound separately on Mica sheets and fitted with body of toaster with the help of ceramic terminals.

Operating voltage of the device is:

Solution: The designed electric toaster is operated at 220 volts A.C., single phase.
QUESTION: 12

Read the following text and answer the following questions on the basis of the same:

Shunt resistance: The ammeter shunt is the device which provides the low resistance path to the flow of current. It is connected in parallel with the ammeter. In some ammeter the shunt is in-built inside the instrument while in others it is externally connected to the circuit. Ammeters are designed for measurement of low current. For measuring high current, the shunt is connected in parallel to the ammeter. The significant portion of the current passes to the shunt because of the low resistance path and little amount of current passes through the ammeter. The shunt is connected in parallel to the ammeter because of which the voltage drops across the meter and shunt remain the same. Thus, the movement of the pointer is not affected by the shunt. Let us consider that the current to be measured is I. The circuit has ammeter and shunt connected parallel to each other. The ammeter is designed for measurement of small current say, Im. The magnitude of the current I passes through the meter is very high, and it will burn the meter. So, for measuring the current I the shunt is required in the circuit. As the shunt connects in parallel with the ammeter, thus the same voltage drops occur between them:

IShRSH = ImRm

∴ RSH = ImRm/ISH

Shunt current ISH = I – Im

So, RSH = ImRm/(I – Im)

∴ I/Im = 1 + (Rm/RSH)

The ratio of the total current to the current required for the movement of the ammeter coil is called the multiplying power of the shunt.

∴ The multiplying power = m = I/Im

RSH = Rm / (m – 1)

The following are the requirements of the shunt.

• The resistance of the shunt should remain constant with time.

• The temperature of the material should remain the same even though substantial current flows through the circuit.

Materials used for making shunt of DC and AC ammeter are respectively

Solution: Manganin is usually used for shunts of DC instruments as it gives a low value of thermal emf with copper although it is liable to corrosion and is difficult to solder. Constantan is a useful material for AC circuits since its comparatively high thermal emf, being unidirectional, is ineffective in these circuits.
QUESTION: 13

Read the following text and answer the following questions on the basis of the same:

Shunt resistance: The ammeter shunt is the device which provides the low resistance path to the flow of current. It is connected in parallel with the ammeter. In some ammeter the shunt is in-built inside the instrument while in others it is externally connected to the circuit. Ammeters are designed for measurement of low current. For measuring high current, the shunt is connected in parallel to the ammeter. The significant portion of the current passes to the shunt because of the low resistance path and little amount of current passes through the ammeter. The shunt is connected in parallel to the ammeter because of which the voltage drops across the meter and shunt remain the same. Thus, the movement of the pointer is not affected by the shunt. Let us consider that the current to be measured is I. The circuit has ammeter and shunt connected parallel to each other. The ammeter is designed for measurement of small current say, Im. The magnitude of the current I passes through the meter is very high, and it will burn the meter. So, for measuring the current I the shunt is required in the circuit. As the shunt connects in parallel with the ammeter, thus the same voltage drops occur between them:

IShRSH = ImRm

∴ RSH = ImRm/ISH

Shunt current ISH = I – Im

So, RSH = ImRm/(I – Im)

∴ I/Im = 1 + (Rm/RSH)

The ratio of the total current to the current required for the movement of the ammeter coil is called the multiplying power of the shunt.

∴ The multiplying power = m = I/Im

RSH = Rm / (m – 1)

The following are the requirements of the shunt.

• The resistance of the shunt should remain constant with time.

• The temperature of the material should remain the same even though substantial current flows through the circuit.

How shunt is connected with a ammeter?

Solution: Ammeter Shunt is used for the measurement of heavy current using an Ammeter. Ammeter Shunt is basically a low resistance connected in parallel with the moving coil so that most of the current is bypassed by the Shunt and hence only a small current flows through the moving coil.
QUESTION: 14

Read the following text and answer the following questions on the basis of the same:

Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrome) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.

In carbon composition resistors, ______ the ratio of carbon, _____ the overall resistance.

Solution: The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance.
QUESTION: 15

Read the following text and answer the following questions on the basis of the same:

Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrome) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.

Wirewound Resistors are made by winding a thin _____ or similar wire on an ____ former in the form of a spiral helix.

Solution: Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrome) or similar wire on an insulating ceramic former in the form of a spiral helix.