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Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Class 10 MCQ


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10 Questions MCQ Test Physics for Class 10 - Assertion & Reason Test: Magnetic Effects of Electric Current - 1

Assertion & Reason Test: Magnetic Effects of Electric Current - 1 for Class 10 2024 is part of Physics for Class 10 preparation. The Assertion & Reason Test: Magnetic Effects of Electric Current - 1 questions and answers have been prepared according to the Class 10 exam syllabus.The Assertion & Reason Test: Magnetic Effects of Electric Current - 1 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 below.
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Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 1

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): In Fleming’s Left Hand Rule, the direction of magnetic field, force and current are mutually perpendicular.

Reason (R): Fleming’s Left hand Rule is applied to measure the induced current.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 1
It is used to find the direction of force in a current carrying conductor in the presence of a magnetic field.
Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 2

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): Two bar magnets attract when they are brought near to each other with the same pole.

Reason (R): Unlike poles will attract each other.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 2
Two bar magnets repel when the same poles face each other. Opposite poles attract each other.
Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 3

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : When the number of turns in a coil is doubled, the coefficient of self-inductance of the coil becomes 4 times.

Reason : This is because self inductance is directly proportional to the square of number of turns in a coil.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 3
Self inductance of coil is given by,

From this we know that Self Inductance of the coil depends on the square of the number of turns of the coil. Hence on doubling the number of turns, the Self Inductance becomes four times.

So, Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion.

Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 4

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): Magnetic field lines never intersect.

Reason (R): At a particular point the magnetic field has only one direction.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 4
Magnetic field lines never intersect each other as for two lines to intersect, there must be two north directions at a point, which is not possible.
Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 5

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): AC load line is used for long distance transmission.

Reason (R): It has very less loss of energy in long distance transmission.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 5
It can be easily transmitted over long distances without much loss in energy.
Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 6

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): Safety fuses are made up of materials having a low melting point.

Reason (R): Safety fuses should be resistant to electric current.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 6
Safety fuses are made up of materials having a low melting point so that when excess current flows through the circuit, the fuse melts breaking the circuit and thus prevents appliances.
Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 7

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): When two bulbs are operated on the same voltage supply, having power 60 W and 100 W then 100 W bulb has less resistance than 60 W.

Reason (R): The power of the bulb is directly proportional to the square of the voltage.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 7
Since, power (P) = V2/R or R ∝ 1/P

Hence, a 100 W bulb has less resistance.

Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 8

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion (A): Copper is used to make electric wires.

Reason (R): Copper has very low electrical resistance.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 8
The low electrical resistance of copper makes it a good conductor for electricity.
Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 9

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : The strength of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the current flowing through the coil.

Reason : Magnetic field strength is inversely proportional to the current flowing in the coil.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 9
The magnetic field produced depends directly on the current flowing through the circular coil. If the number of turns of the coil increases then the current flowing in a coil also increases and hence the magnetic field will increase with increase in the number of turns.
Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 10

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : The strength of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the number of turns of the circular coil.

Reason: Magnetic field strength is directly proportional to the number of turns of the circular coil.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 1 - Question 10
The magnetic field produced depends directly on the current flowing through the circular coil. If the number of turns of the coil increases then the current flowing in a coil also increases and hence the magnetic field will increase with increase in the number of turns.
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