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Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Class 10 MCQ


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15 Questions MCQ Test Online MCQ Tests for Class 10 - Assertion & Reason Test: Magnetic Effects of Electric Current - 2

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Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - 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 : On freely suspending a current - carrying solenoid, it comes to rest in N-S direction just like a bar magnet.

Reason : One end of current carrying straight solenoid behaves as a North pole and the other end as a South pole.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 1
Current carrying freely suspended solenoid behaves just like a bar magnet with fixed polarities (North and South) at its ends. Hence it rests in the North-South direction exactly in the same manner as a bar magnet does.
Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - 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 compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of an electric current in the wire is increased.

Reason : Strength of a magnetic field at a point near the conductor increases on increasing the current.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 2

Assertion : A compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of an electric current in the wire is increased. This statement is false. As Deflection of compass increases when current is increased.

Reason : Strength of a magnetic field at a point near the conductor increases on increasing the current. This statement is True.

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Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - 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 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: 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 - 2 - Question 3
According to Ohm’s Law, the resistance of an electric device can be calculated by dividing its voltage by the amount of electric current assumed.

If the voltage of two bulbs is assumed to be the same, the resistance of the bulbs equals to V/100 and V/60 respectively.

Thus, it is proved that the 60W bulb has higher resistance than the 100W bulb.

Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - 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 : An induced e.m.f. appears in any coil in which the current is changing.

Reason : Self induction phenomenon obeys Faraday’s law of induction.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 4
The property of a coil to oppose the change in flux linked with it due to the change in current in the same coil and hence opposing the change in current is called self-induction. It obeys Faraday's Law of induction. Hence, both assertion and reason are correct, but reason does not explain assertion.
Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - 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 : The magnetic field is stronger at a point which is nearer to the conductor and goes on decreasing on moving away from the conductor.

Reason : The magnetic field B produced by a straight current carrying wire is inversely proportional to the distance from the wire.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 5
The magnitude of magnetic field is

1. directly proportional to the current I passing through the wire.

2. Inversely proportional to the distance r from the wire.

The magnetic field is stronger at a point which is nearer to the conductor and goes on decreasing on moving away from the conductor.

Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - 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 direction current flows through a metallic rod, producing a magnetic field only outside the rod.

Reason : There is no flow of charge carriers inside the rod.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 6
In the case of metallic rod, the charge carries flow through the whole of the cross-section. Therefore, the magnetic field exists both inside as well as outside. However, the magnetic field inside the rod will not decrease as we go towards the axis.
Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - 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 : Electric appliances with metallic bodies have three connections, whereas an electric bulb has two pin connections.

Reason : Three pin connections reduce heating of connecting wires.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 7
The metallic body of the electrical appliance is connected to the third pin which is connected to the earth. This is a safety precaution and avoids eventual electric shock. By doing this the extra charge flowing through the metallic body is passed to earth and avoids shocks. There is nothing such as reducing the heating of connecting wires by three pin connections.
Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - 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 : When two long parallel wires, hanging freely are connected in series to a battery, they come closer to each other.

Reason : Wires carrying current in opposite direction repel each other

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 8
The wires are parallel to each other but the direction of current in it is in the same direction so they attract each other. If the current in the wire is in the opposite direction then wires repel each other.
Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - 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 : A small coil carrying current, in equilibrium, is perpendicular to the direction of the uniform magnetic field.

Reason : Torque is maximum when the plane of coil and direction of the magnetic field are parallel to each other.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 9
The torque acting on a coil is given by, r = NIA Bsin?
Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - 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: Basic difference between an electric line and magnetic line of force is that the former is discontinuous and the latter is continuous or endless.

Reason: No electric lines of force exist inside a charged body but magnetic lines do exist inside a magnet

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 10
In the case of the electric field of an electric dipole, the electric lines of force originate from positive charge and end at negative charge. Since, isolated magnetic lines are closed continuous loops extending throughout the body of the magnet, hence they form endless curves.
Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 11

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

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

Reason : Unlike poles will attract each other.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 11
When the north poles of two bar magnets are brought close together, there will be a force of repulsion opposites attract, if north is brought together with North they will repel.

Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 12

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

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

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

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 12
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 - 2 - Question 13

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

Assertion : No net force acts on a rectangular coil carrying a steady current when suspended freely in a uniform magnetic field.

Reason : Force on coil in magnetic field is always nonzero.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 13
Force acting on each pair of the opposite sides of the coil are equal.
Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 14

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 proton moves horizontally towards a vertical long conductor having an upward electric current. It will deflect vertically downward.

Reason : Seeing the proton and the conductor from the side of the proton, the magnetic field at the site of the proton will be towards the right. Hence the force will deflect the proton vertically downward.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 14
Seeing the proton and the conductor from the side of the proton, the magnetic field at the site of the proton will be towards the right. Hence the force will deflect the proton vertically downward.
Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 15

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 neutral body may experience a net nonzero magnetic force.

Reason : The net charge on a current carrying wire is zero, but it can experience a force in a magnetic field.

Detailed Solution for Assertion & Reason Test: Magnetic Effects of Electric Current - 2 - Question 15
A material body is ultimately composed of elementary particles like electrons, protons and neutrons, many of which have an electric charge. A body may be called 'electrically neutral' when adding the electric charges, some of which are positive, some negative and some zero. Of all its constituent elementary particles, the sum is zero. If all the charged elementary particles of a neutral body were at rest (relative to the body itself) then the body would exert no net force on another similar neutral body because the forces exerted by the charged particles of the first body on the charged particles of the second body would exactly cancel. The force between two charged particles also depends on the relative velocity of these particles and therefore, considering that in neutral body, the negative particles (electrons) have high speeds (relative to the body itself) while the positive particles (protons) have small speeds, it is expected (as explained below) that the net electro-dynamic force between two neutral pieces of matter, that is, with electrical field and magnetic field is not zero.

Electric current is the flow of free electrons in the conductor. At any instant, the number of electrons leaving the wire is always equal to the number of electrons flowing from the battery into it. Hence, the net charge on the wire is zero.

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