NEET Online Exam: Trivia Quiz
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Questions and Answers
- 1.
The property of inductance offers opposition to which of the following quantities?
- A.
Constant current
- B.
Constant voltage
- C.
Changes in current
- D.
Changes in voltage
Correct Answer
C. Changes in currentExplanation
Inductance offers opposition to changes in current. This is because inductors store energy in a magnetic field, and any change in current through the inductor induces a change in the magnetic field. The induced magnetic field then opposes the change in current, resulting in opposition to changes in current.Rate this question:
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- 2.
What is the symbol for inductance?
- A.
L
- B.
H
- C.
XL
- D.
IND
Correct Answer
A. LExplanation
The symbol for inductance is represented by the letter "L" in electrical circuits. Inductance is a property of an electrical circuit that opposes any changes in the current flowing through it. It is measured in henries (H). The other options, XL and IND, are not commonly used symbols for inductance.Rate this question:
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- 3.
What is the unit of measurement for inductance?
- A.
Ohm
- B.
Rel
- C.
Farad
- D.
Henry
Correct Answer
D. HenryExplanation
The unit of measurement for inductance is Henry. Inductance is a property of an electrical circuit that opposes changes in current. It is measured in Henry, named after American scientist Joseph Henry, who made significant contributions to the understanding of electromagnetism.Rate this question:
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- 4.
If 9 volts are induced in a conductor when the current changes by 4.5 amperes in one second, what is the total inductance of the circuit?
- A.
1.5 henries
- B.
2.0 henries
- C.
13.5 henries
- D.
40.0 henries
Correct Answer
B. 2.0 henriesExplanation
When a current changes in a circuit, it induces a voltage in the conductor according to Faraday's law of electromagnetic induction. The induced voltage is directly proportional to the rate of change of current and the inductance of the circuit. In this case, the current changes by 4.5 amperes in one second and induces a voltage of 9 volts. By rearranging the formula V = L * (dI/dt), where V is the induced voltage, L is the inductance, and (dI/dt) is the rate of change of current, we can solve for L. Plugging in the given values, we find that the inductance of the circuit is 2.0 henries.Rate this question:
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- 5.
What physical property is similar to inductance?
- A.
Mass
- B.
Motion
- C.
Velocity
- D.
Inertia
Correct Answer
D. InertiaExplanation
Inertia is the physical property that is similar to inductance. Inertia is the resistance of an object to changes in its motion, while inductance is the property of an electrical circuit that opposes changes in current flow. Both inertia and inductance involve a resistance or opposition to change, making them similar physical properties.Rate this question:
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- 6.
The difference in potential across a resistor, created by current through the resistor is an example of which of the following forces?
- A.
Resistive
- B.
Inertia
- C.
Inductive
- D.
Electromotive
Correct Answer
D. ElectromotiveExplanation
The difference in potential across a resistor, created by current through the resistor, is an example of electromotive force. Electromotive force, also known as voltage, is the driving force that pushes the electric charges through a circuit. In this case, the current flowing through the resistor creates a potential difference, or voltage, across it. This voltage is the electromotive force that causes the charges to move through the resistor.Rate this question:
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- 7.
When a magnetic field moves through a stationary conductor, the electrons in orbit are affected in what manner?
- A.
They are dislodged from orbit
- B.
They move closer to their nucleus
- C.
They move closer to other orbiting electrons
- D.
They bunch up on one side of the nucleus
Correct Answer
A. They are dislodged from orbitExplanation
When a magnetic field moves through a stationary conductor, the magnetic field induces a current in the conductor. This current creates a force on the electrons in the conductor, causing them to move. As a result, the electrons are dislodged from their original orbits around the nucleus of the atoms in the conductor. This phenomenon is known as the Hall effect, and it is the basis for many practical applications such as magnetic sensors and current measurements.Rate this question:
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- 8.
When electrons are moved in a conductor by a magnetic field, a force known by which of the following terms is created?
- A.
Voltage
- B.
Electromotive
- C.
Potential difference
- D.
All of the above
Correct Answer
B. ElectromotiveExplanation
When electrons are moved in a conductor by a magnetic field, a force known as electromotive force (EMF) is created. EMF is the force that pushes the electrons through the conductor and causes them to flow in a certain direction. It is responsible for the generation of electric current in a circuit. Voltage and potential difference are both terms used to describe the magnitude of the EMF. Therefore, the correct answer is "Electromotive".Rate this question:
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- 9.
Self-induced emf is also known as what force?
- A.
Magnetic force
- B.
Inertial force
- C.
Electromotive force
- D.
Counter electromotive force
Correct Answer
D. Counter electromotive forceExplanation
Self-induced emf refers to the phenomenon where a changing magnetic field induces an opposing voltage in a conductor, according to Faraday's law of electromagnetic induction. This induced voltage is known as counter electromotive force (CEMF), which opposes the change in current flow. Therefore, the correct answer is CEMF.Rate this question:
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- 10.
According to Lenz’s Law, the induced emf produced by a change in current in an inductive circuit tends to have what effect on the current?
- A.
It aids a rise in current and opposes fall in current
- B.
It aids a fall in current and opposes a rise in current
- C.
It opposes either a rise or a fall in current
- D.
It aids either a rise or fall in current
Correct Answer
C. It opposes either a rise or a fall in currentExplanation
According to Lenz's Law, the induced emf produced by a change in current in an inductive circuit tends to oppose the change in current. This means that if there is a rise in current, the induced emf will try to reduce the current. Similarly, if there is a fall in current, the induced emf will try to increase the current. Therefore, the correct answer is "It opposes either a rise or a fall in current."Rate this question:
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- 11.
The direction of the induced voltage in an inductor may be found by the application of which of the following rules?
- A.
The left-hand rule for inductors
- B.
The left-hand rule for generators
- C.
The right-hand rule for conductors
- D.
The right-hand rule for motors
Correct Answer
B. The left-hand rule for generatorsExplanation
The left-hand rule for generators can be used to determine the direction of the induced voltage in an inductor. This rule states that if the thumb, index finger, and middle finger of the left hand are extended perpendicular to each other, with the index finger representing the direction of the magnetic field and the middle finger representing the direction of the current, then the thumb will indicate the direction of the induced voltage.Rate this question:
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- 12.
The left-hand rule for generators states that the thumb of the left-hand points in the direction of motion of the:
- A.
Conductor
- B.
Magnetic field
- C.
Generator poles
- D.
Induced current
Correct Answer
A. ConductorExplanation
The left-hand rule for generators states that the thumb of the left hand points in the direction of motion of the conductor. This rule is used to determine the direction of the induced current in a generator. When a conductor moves through a magnetic field, it experiences a force that causes the electrons in the conductor to move, creating an induced current. By using the left-hand rule, we can determine the direction of this current based on the motion of the conductor.Rate this question:
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- 13.
When source voltage is removed from a current-carrying conductor, a voltage will be induced in the conductor by which of the following actions?
- A.
The decreasing voltage
- B.
The collapsing magnetic field
- C.
The reversal of current
- D.
The reversing electrical field
Correct Answer
C. The reversal of currentExplanation
When the source voltage is removed from a current-carrying conductor, a voltage will be induced in the conductor by the reversal of current. This is because when the source voltage is removed, the magnetic field around the conductor collapses. This collapsing magnetic field induces a voltage in the conductor, causing the current to reverse its direction. This phenomenon is known as self-induction or back EMF (electromotive force). The reversal of current helps to maintain the flow of current in the conductor even after the source voltage is removed.Rate this question:
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- 14.
The property of inductance is present in which of the following electrical circuits?
- A.
An ac circuit
- B.
A dc circuit
- C.
A resistive circuit
- D.
Each of the above
Correct Answer
A. An ac circuitExplanation
The property of inductance is present in an AC circuit. Inductance is the property of an electrical circuit that opposes changes in current flow. It is caused by the presence of an inductor, which is a coil of wire that stores energy in its magnetic field. In an AC circuit, the current continuously changes direction, causing the magnetic field in the inductor to constantly expand and collapse. This results in the generation of an induced voltage that opposes the change in current, exhibiting the property of inductance. In contrast, in a DC circuit or a resistive circuit, where the current is constant or there is no inductor present, the property of inductance is not applicable.Rate this question:
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- 15.
How are inductors classified?
- A.
By core type
- B.
By conductor type
- C.
By the number of turns
- D.
By the direction of the windings on the core
Correct Answer
A. By core typeExplanation
Inductors are classified by core type, which refers to the material used for the core of the inductor. Different core materials have different magnetic properties, which affect the inductor's performance. The most common core types are air core, iron core, ferrite core, and toroidal core. Each core type has its own advantages and disadvantages, making it suitable for different applications. By classifying inductors based on core type, it becomes easier to select the right inductor for a specific circuit or system.Rate this question:
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- 16.
Normally, most coils have cores composed of either air or:
- A.
Copper
- B.
Carbon
- C.
Soft iron
- D.
Carbon steel
Correct Answer
C. Soft ironExplanation
Soft iron is commonly used as a core material in coils because it has high magnetic permeability, which allows it to easily magnetize and demagnetize. This property makes soft iron ideal for enhancing the magnetic field produced by the coil. Additionally, soft iron has low electrical conductivity, which reduces eddy currents and energy losses in the core. This makes soft iron an efficient and effective choice for core material in coils.Rate this question:
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- 17.
The hollow form of nonmagnetic material found in the center of an aircore coil has what purpose?
- A.
To focus the magnetic flux
- B.
To support the windings
- C.
To act as a low resistance path for flux
- D.
To serve as a container for the core
Correct Answer
D. To serve as a container for the coreExplanation
The hollow form of nonmagnetic material found in the center of an aircore coil serves as a container for the core. The core is placed inside the hollow form to provide support and structure to the coil. It helps to maintain the shape and stability of the coil, ensuring that the windings are properly aligned and spaced. Additionally, the hollow form also helps to protect the core from external factors such as dust, moisture, and physical damage.Rate this question:
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- 18.
Which of the following factors will NOT affect the value of inductance of a coil?
- A.
Number of coil turns
- B.
Diameter of the coil
- C.
Conductor tensility
- D.
Core materials used
Correct Answer
C. Conductor tensilityExplanation
The value of inductance of a coil is not affected by the conductor tensility. Inductance is primarily determined by factors such as the number of coil turns, the diameter of the coil, and the core materials used. Conductor tensility refers to the ability of the conductor material to withstand stretching or bending without breaking. While conductor tensility is important for the durability and flexibility of the coil, it does not directly impact the inductance value.Rate this question:
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- 19.
When the number of turns is increased in a coil from 2 to 4, the total inductance will increase by a factor of?
- A.
Eight
- B.
Two
- C.
Six
- D.
Four
Correct Answer
D. FourExplanation
When the number of turns in a coil is increased from 2 to 4, the total inductance will increase by a factor of four. This is because inductance is directly proportional to the square of the number of turns in a coil. So, when the number of turns is doubled from 2 to 4, the inductance will increase by a factor of four (2^2 = 4).Rate this question:
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- 20.
Why do large diameter coils have greater inductance than smaller diameter coils, all other factors being the same?
- A.
Large diameter coils have more wire and thus more flux
- B.
Large diameter coils have less resistance
- C.
Small diameter coils have less resistance
- D.
Small diameter coils have large cemfs which oppose current flow
Correct Answer
A. Large diameter coils have more wire and thus more fluxExplanation
Large diameter coils have more wire, which means there are more turns of wire in the coil. This increases the amount of magnetic field lines, or flux, that can pass through the coil. The increase in flux results in a higher inductance because inductance is directly proportional to the number of turns in a coil. Therefore, large diameter coils have greater inductance than smaller diameter coils, all other factors being the same.Rate this question:
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- 21.
If the radius of a coil is doubled, its inductance is increased by what factor?
- A.
One
- B.
Two
- C.
Eight
- D.
Four
Correct Answer
D. FourExplanation
When the radius of a coil is doubled, its inductance is increased by a factor of four. This is because the inductance of a coil is directly proportional to the square of its radius. So, when the radius is doubled, the inductance becomes four times larger.Rate this question:
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- 22.
If the length of a coil is doubled while the number of turns is kept the same, this will have (a) what effect on inductance and (b) by what factor?
- A.
(a) Decrease, (b) by 1/4
- B.
(a) Decrease, (b) by 1/2
- C.
(a) Increase, (b) by 2 times
- D.
(a) Increase, (b) by 4 times
Correct Answer
B. (a) Decrease, (b) by 1/2Explanation
When the length of a coil is doubled while the number of turns remains the same, the inductance will decrease. This is because inductance is directly proportional to the square of the number of turns and inversely proportional to the length of the coil. Therefore, when the length is doubled, the inductance will decrease by a factor of 1/2.Rate this question:
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- 23.
A soft iron core will increase inductance because it has which of the following characteristics?
- A.
Low permeability and low reluctance
- B.
Low permeability and high reluctance
- C.
High permeability and high reluctance
- D.
High permeability and low reluctance
Correct Answer
D. High permeability and low reluctanceExplanation
A soft iron core will increase inductance because it has high permeability, which means it can easily allow the magnetic flux to pass through it. Additionally, it has low reluctance, which means it offers minimal opposition to the flow of magnetic flux. These characteristics of high permeability and low reluctance result in a higher inductance value for the soft iron core.Rate this question:
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