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Test: Magnetic Effects of Electric Current - 1 - UPSC MCQ


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30 Questions MCQ Test Science & Technology for UPSC CSE - Test: Magnetic Effects of Electric Current - 1

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Test: Magnetic Effects of Electric Current - 1 - Question 1

An electric fuse prevents damage to the appliances and circuits due to ____.

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 1

An electric fuse prevents damage to the appliances and circuits due to short-circuiting, which can occur when the live wire and the neutral wire come into direct contact, causing an abrupt increase in current flow.

Test: Magnetic Effects of Electric Current - 1 - Question 2

What defines a solenoid in the context of magnetic fields?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 2

In the context of magnetic fields, a solenoid is defined as a coil of many circular turns of insulated wire. Solenoids are crucial components in electromagnets and various electrical devices due to their ability to generate strong and uniform magnetic fields.

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Test: Magnetic Effects of Electric Current - 1 - Question 3

Assertion (A): Magnetic field lines around a current-carrying straight conductor form closed loops.

Reason (R): Magnetic monopoles do not exist in nature.

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 3
  • The Assertion is correct. Magnetic field lines always form closed loops around a current-carrying conductor.
  • The Reason is also correct as magnetic monopoles, isolated magnetic charges (separate north or south poles), have not been observed in nature.
  • However, the Reason does not provide a direct explanation for the Assertion. The formation of closed loops in magnetic fields is a consequence of the fundamental property of magnetic fields, not directly related to the absence of magnetic monopoles.
  • Therefore, the correct option is revealed through detailed examination.
Test: Magnetic Effects of Electric Current - 1 - Question 4

What did Hans Christian Oersted discover accidentally?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 4

Hans Christian Oersted accidentally discovered the deflection of a compass needle near a metallic wire when an electric current passed through it, revealing the relationship between electricity and magnetism.

Test: Magnetic Effects of Electric Current - 1 - Question 5

What is the purpose of the earth wire in a domestic electric circuit?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 5
  • The earth wire in a domestic electric circuit is primarily installed to protect against electric shocks. It provides a low-resistance path for the current, ensuring that any leakage of current to the metallic body of an appliance keeps its potential equal to that of the earth.
  • This safety measure prevents users from experiencing severe electric shocks.
Test: Magnetic Effects of Electric Current - 1 - Question 6

An electric motor converts

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 6

An electric motor converts electrical energy into mechanical energy.

Test: Magnetic Effects of Electric Current - 1 - Question 7

Assertion (A): A metallic wire carrying an electric current has associated with it a magnetic field.

Reason (R): The field lines about the wire consist of a series of concentric circles whose direction is given by the right-hand rule.

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 7
  • The Assertion is correct. When a metallic wire carries an electric current, it generates a magnetic field around it. This phenomenon is a fundamental aspect of electromagnetism.
  • The Reason is also correct. The magnetic field around the wire indeed forms concentric circles, and the direction of these circles is determined by the right-hand rule.
  • However, the Reason statement is not the correct explanation of the Assertion. While both statements are individually true, the Reason does not directly explain why a metallic wire carrying an electric current produces a magnetic field.
Test: Magnetic Effects of Electric Current - 1 - Question 8

Assertion (A): The magnetic field lines around a bar magnet are closed curves.

Reason (R): Inside the magnet, the direction of field lines is from its south pole to its north pole.

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 8
  • Assertion (A) is true; magnetic field lines around a bar magnet are indeed closed curves.
  • Reason (R) is also true; inside the magnet, the direction of field lines runs from its south pole to its north pole.
  • However, the Reason does not correctly explain Assertion, as the closure of field lines is a consequence of the overall magnetic field configuration rather than just the direction of the field lines inside the magnet.
Test: Magnetic Effects of Electric Current - 1 - Question 9
Choose the correctly matched pair:
Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 9
  • Option A is correctly matched. The right-hand thumb rule is used to determine the direction of the magnetic field around a current-carrying straight conductor. According to this rule, if you hold the conductor in your right hand such that your thumb points in the direction of the current, your fingers will curl around the conductor in the direction of the magnetic field lines.
  • Option B is incorrect. The right-hand thumb rule specifically applies to a straight conductor, not a circular loop. For a current-carrying circular loop, the magnetic field lines form concentric circles at every point of the loop and appear as straight lines at the center.
  • Option C is incorrect. Maxwell's corkscrew rule is another way of describing the right-hand thumb rule for determining the direction of the magnetic field around a current-carrying conductor. It does not describe the motion of charged particles in a magnetic field.
  • Option D is incorrect. Magnetic field lines never intersect each other. If they did, it would imply that there are two different directions of the magnetic field at the point of intersection, which is not possible.
Test: Magnetic Effects of Electric Current - 1 - Question 10

Why does a compass needle get deflected when brought near a _____?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 10

When a compass needle is brought near an electric current, it gets deflected due to the magnetic effect produced by the current passing through a nearby conductor.

Test: Magnetic Effects of Electric Current - 1 - Question 11

The magnetic field is stronger where the field lines are ______.

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 11

The magnetic field is stronger where the field lines are closer together, indicating a higher concentration of magnetic force in that region. This closeness of field lines signifies a greater force acting on the poles of another magnet placed in that area.

Test: Magnetic Effects of Electric Current - 1 - Question 12

The phenomenon of electromagnetic induction is

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 12

Electromagnetic induction is the phenomenon due to which an induced current is set up in a coil when magnetic field around it, is changed.

Test: Magnetic Effects of Electric Current - 1 - Question 13

In Fleming’s left-hand rule the thumb indicates the direction of

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 13

In Fleming’s left-hand rule the thumb indicates the direction of mechanical force acting on the conductor. The forefinger points in the direction of magnetic field and the central finger in the direction of current flowing in the conductor.

Test: Magnetic Effects of Electric Current - 1 - Question 14

Which property of a proton can change while it moves freely in a magnetic field?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 14

When a proton moves freely in a magnetic field, its velocity can change. This change occurs due to the interaction between the magnetic field and the moving charge, leading to alterations in the proton's direction and speed.

Test: Magnetic Effects of Electric Current - 1 - Question 15

Assertion (A): The deflection of a compass needle decreases as the distance from a current-carrying conductor increases.

Reason (R): The magnetic field produced by a given current in the conductor decreases as the distance from it increases.

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 15
  • The Assertion is true as per the information provided in the text. As the distance from a current-carrying conductor increases, the deflection of a compass needle does indeed decrease.
  • The Reason is true. The magnetic field produced by a given current in the conductor decreases as the distance from it increases, as explained in the content.
  • However, the Reason is not the correct explanation of the Assertion. While both statements are individually correct, the decrease in deflection with distance is due to the weakening magnetic field, not necessarily because the magnetic field decreases in magnitude. Hence, Option C is the correct answer for this question.
Test: Magnetic Effects of Electric Current - 1 - Question 16

A metallic wire carrying an electric current has associated with it a _______.

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 16

A metallic wire carrying an electric current generates a magnetic field around it. This phenomenon is a fundamental concept in electromagnetism, demonstrated by the right-hand rule.

Test: Magnetic Effects of Electric Current - 1 - Question 17

Which among of these are the main characteristics of fuse element?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 17

Fuse wire must have high conductivity, low melting point and it do not burn due to oxidation. These characteristics of a fuse wire make it possible to prevent from damages.

Test: Magnetic Effects of Electric Current - 1 - Question 18

The main advantage of A.C power transmission over D.C power transmission over long distance is

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 18

AC transmit over a long distance without much loss of energy as compare to DC.

Test: Magnetic Effects of Electric Current - 1 - Question 19

Overloading is due to

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 19

Overloading occurs when there is any fault in the appliances or the insulation of wire got damaged. It also occurs when there is sudden hike in supply voltage.

Test: Magnetic Effects of Electric Current - 1 - Question 20

What is the name of the rule that determines the direction of magnetic field lines around a current-carrying straight conductor?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 20
  • The correct answer is the Right-hand thumb rule, which helps in determining the direction of magnetic field lines around a current-carrying straight conductor.
  • When the thumb points in the direction of the current, the fingers wrap around the conductor in the direction of the magnetic field lines.
Test: Magnetic Effects of Electric Current - 1 - Question 21
Choose the correctly matched pair.
Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 21
  • Option A: Electric generator - Converts mechanical energy to electrical energy. This is correct because an electric generator functions by converting mechanical energy into electrical energy through electromagnetic induction.
  • Option B: Electric motor - Converts electrical energy to sound energy. This is incorrect. An electric motor converts electrical energy to mechanical energy, not sound energy.
  • Option C: Loudspeaker - Converts electrical energy to mechanical energy. This is incorrect. A loudspeaker converts electrical signals (electrical energy) into sound energy (mechanical vibrations of the diaphragm).
  • Option D: Microphone - Converts magnetic energy to electrical energy. This is incorrect. A microphone converts sound energy (mechanical energy) into electrical energy.

Thus, the correct match is provided in Option A.

Test: Magnetic Effects of Electric Current - 1 - Question 22

Assertion (A): When a circular loop of wire lies in the plane of the table with current passing through it clockwise, the magnetic field direction inside and outside the loop can be determined using the right-hand rule.

Reason (R): The magnetic field in a given region is uniform.

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 22
  • The assertion is correct. When a circular loop of wire lies in the plane of the table with current passing through it clockwise, the right-hand rule helps determine the direction of the magnetic field inside and outside the loop. This rule states that if the thumb points in the direction of the current, the fingers curl in the direction of the magnetic field lines.
  • Regarding the reason, it is also correct. A uniform magnetic field means that the field strength and direction are consistent throughout the region in question.
  • However, the reason does not directly explain the assertion. While a uniform magnetic field is mentioned in the reason, it does not serve as a direct explanation for how the right-hand rule is used to determine the magnetic field direction around a current-carrying loop.
  • Therefore, the correct answer is Option B: If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Test: Magnetic Effects of Electric Current - 1 - Question 23

What is the purpose of a fuse in an electrical circuit?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 23
  • A fuse in an electrical circuit serves the crucial role of safeguarding the circuit from short-circuiting or overloading. It does so by breaking the circuit when excessive current flows through it, thereby preventing damage to the components and ensuring safety.
  • Fuses are designed to melt and interrupt the flow of current when the current exceeds a safe level, thus protecting the circuit from potential hazards.
Test: Magnetic Effects of Electric Current - 1 - Question 24

What determines the pattern of the magnetic field generated by a current through a conductor?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 24

The pattern of the magnetic field generated by a current through a conductor is primarily determined by the shape of the conductor. Different shapes of conductors can produce varied patterns of magnetic fields based on their geometries and orientations.

Test: Magnetic Effects of Electric Current - 1 - Question 25
Choose the correctly matched pair:
Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 25
  • Option A: Live wire - Green insulation:
    • This is incorrect. According to the provided content, the live wire has red insulation, not green. The green insulation is used for the earth wire.
  • Option B: North pole - Points towards north:
    • This is correct. The content states that one end of a compass needle, which points towards the north, is called the north pole.
  • Option C: Magnetic field lines - Straight lines:
    • This is incorrect. The content describes magnetic field lines as paths along which a hypothetical free north pole would tend to move, and they are shown closer together where the magnetic field is greater. They are not necessarily straight lines.
  • Option D: Neutral wire - Red insulation:
    • This is incorrect. According to the content, the neutral wire has black insulation, not red. The red insulation is for the live wire. Therefore, the correctly matched pair is Option B: North pole - Points towards north.
Test: Magnetic Effects of Electric Current - 1 - Question 26

Earth wire carries

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 26

A "groundingwire on the other hand is a safety wire that has intentionally been connected to earth. The grounding wire does not carry electricity under normal circuit operations. It's purpose is to carry electrical current only under short circuit or other conditions that would be potentially dangerous.

Test: Magnetic Effects of Electric Current - 1 - Question 27

What do concentric circles around a straight conducting wire represent?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 27

The concentric circles around a straight conducting wire represent the magnetic field lines produced by the electric current flowing through the wire. These lines indicate the direction and strength of the magnetic field surrounding the wire.

Test: Magnetic Effects of Electric Current - 1 - Question 28

What is the primary function of an electric fuse in a circuit?

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 28

An electric fuse plays a crucial role in preventing damage to appliances and circuits caused by overloading. When there is an abrupt increase in current due to short-circuiting or other faults, the fuse melts to break the circuit, safeguarding the system from potential harm.

Test: Magnetic Effects of Electric Current - 1 - Question 29
Choose the correctly matched pair.
Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 29
  • Option A: (a) Hans Christian Oersted - Discovered the magnetic effect of electric current in 1820 This is the correct pair. Hans Christian Oersted, in 1820, discovered that a compass needle gets deflected when an electric current passes through a nearby metallic wire, demonstrating the magnetic effect of electric current.
  • Option B: (b) Compass needle - Always points towards the west This is incorrect. A compass needle points towards the north and south directions, not the west.
  • Option C: (c) Iron filings - Represent electric field lines This is incorrect. Iron filings align along magnetic field lines, not electric field lines.
  • Option D: (d) North pole - Repels the south pole of another magnet This is incorrect. The north pole of a magnet attracts the south pole of another magnet, while like poles repel each other.
Test: Magnetic Effects of Electric Current - 1 - Question 30

The direction of induced current produced in a rectangular coil, when it is rotated in a uniform magnetic field, is given by

Detailed Solution for Test: Magnetic Effects of Electric Current - 1 - Question 30

Fleming’s right-hand rule gives the direction of induced current in a rectangular coil when the coil is rotated in a uniform magnetic field.

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