Electromagnetic Induction MCQs : This section focuses on the "Electromagnetic Induction" in Physics Class 12. These Multiple Choice Questions (MCQs) should be practiced to improve the Physics Class 12 skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Electromagnetic Induction was discovered by Michael Faraday in?
A. 1830
B. 1831
C. 1832
D. 1833
View Answer
Ans : B
Explanation: Electromagnetic Induction was discovered by Michael Faraday in 1831 and James Clerk Maxwell mathematically described it as Faraday’s law of induction.
Question 2
What are all Applications of Electromagnetic Induction?
A. AC generator
B. electrical transformers
C. magnetic flow
D. All of the above
View Answer
Ans : D
Explanation: All of the above are Applications of Electromagnetic Induction.
Question 3
In Electromagnetic Induction Formula, e stands for?
A. number of turns in the coil
B. magnetic flux
C. induced voltage
D. time
View Answer
Ans : C
Explanation: e is the induced voltage (in volts)
Question 4
Electromagnetic Induction is a current produced because of voltage production (electromotive force) due to a changing magnetic field.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, Electromagnetic Induction is a current produced because of voltage production (electromotive force) due to a changing magnetic field.
Question 5
Pick out the SI unit of magnetic flux.
A. Ampere
B. Tesla meter
C. Weber
D. Maxwell
View Answer
Ans : C
Explanation: The magnetic flux through a surface is the surface integral of the normal component of the magnetic field flux density passing through that surface. The SI unit of magnetic flux is weber (Wb). One weber is the flux produced when a uniform magnetic field of one tesla acts normally over an area of 1 cm2.
Question 6
Which of the following is a unit of magnetic flux?
A. Gauss
B. Tesla
C. Ampere
D. Maxwell
View Answer
Ans : D
Explanation: The CGS unit of magnetic flux is Maxwell (Mx). One Maxwell is the flux produced when a uniform magnetic field of one gauss acts normally over an area of 1 cm2
Question 7
Which type of physical quantity is magnetic flux?
A. Scalar
B. Vector
C. Isotropic
D. Isentropic
View Answer
Ans : A
Explanation: The magnetic flux is measured as the product of the component of the magnetic field normal to the surface and the surface area.Magnetic flux is a scalar quantity.
Question 8
What is the instrument used in Faraday’s experiment?
A. Meter Bridge
B. Ammeter
C. Voltmeter
D. Galvanometer
View Answer
Ans : D
Explanation: Faraday used a galvanometer and connected it to a coil. A bar magnet was pushed towards the coil, such that the north-pole is pointing towards the coil. As the bar magnet is shifted, the pointer in the galvanometer gets deflected, thus indicating the presence of current in the coil.
Question 9
Calculate the magnetic flux produced when the magnetic field is parallel to the surface area.
A. Maximum
B. Minimum
C. Zero
D. Depends on the magnetic field
View Answer
Ans : C
Explanation: It follows that magnetic flux linked with a surface is zero when the direction of the magnetic field is parallel to the surface area.
Question 10
The induced voltage is directly proportional to the number of turns/coils of the wire.
A. Yes
B. No
C. Can be yes or no
D. Can not say
View Answer
Ans : A
Explanation: The induced voltage is directly proportional to the number of turns/coils of the wire. Greater the number of turns, greater is voltage produced