Q1) Who discovered the phenomenon of electromagnetic induction?

a) Michael Faraday

b) James Clerk Maxwell

c) Isaac Newton

d) Nikola Tesla

Q2) What is the SI unit of magnetic flux?

a) Tesla

b) Gauss

c) Weber

d) Henry

Q3) According to Faraday's law of electromagnetic induction, the magnitude of induced electromotive force (EMF) is proportional to which of the following?

a) Rate of change of magnetic field

b) Strength of the magnetic field

c) Resistance of the conductor

d) Distance between the coils

Q4) Lenz's law is a consequence of which principle of physics?

a) Law of conservation of energy

b) Newton's third law of motion

c) Law of gravitational force

d) Coulomb's law

Q5) In electromagnetic induction, if the direction of motion between a magnet and a coil is reversed, what happens to the direction of the induced current?

a) It remains the same

b) It becomes zero

c) It reverses

d) It depends on the strength of the magnet

Q6) What is the name of the device used to convert mechanical energy into electrical energy through electromagnetic induction?

a) Transformer

b) Inductor

c) Generator

d) Capacitor

Q7) Which of the following factors does NOT affect the magnitude of the induced electromotive force (EMF) in a coil?

a) Number of turns in the coil

b) Magnetic permeability of the core material

c) Strength of the magnetic field

d) Length of the coil

Q8) Mutual induction occurs between which of the following?

a) Two parallel conductors

b) A coil and a magnetic field

c) Two adjacent coils

d) A magnet and a conductor

Q9) What happens to the induced current in a coil if the rate of change of magnetic flux through the coil increases?

a) The induced current decreases

b) The induced current remains constant

c) The induced current increases

d) The induced current becomes zero

Q10) What is the direction of the induced current in a coil according to Lenz's law?

a) It flows in the direction that opposes the change in magnetic flux

b) It flows in the same direction as the change in magnetic flux

c) It flows perpendicular to the magnetic field

d) It flows in the direction of the magnetic field

Q11) What is the process called when a changing current in one coil induces a current in a nearby coil?

a) Self-induction

b) Mutual induction

c) Electromagnetic radiation

d) Electromagnetic interference

Q12) Which of the following materials is commonly used as a core in transformers to enhance mutual induction?

a) Copper

b) Aluminum

c) Iron

d) Silver

Q13) What is the effect of increasing the number of turns in a coil on the induced electromotive force (EMF)?

a) It decreases

b) It increases

c) It remains the same

d) It depends on the strength of the magnetic field

Q14) What is the relationship between the frequency of the alternating current and the induced voltage in a transformer?

a) Directly proportional

b) Inversely proportional

c) No relationship

d) It depends on the number of turns in the coils

Q15) Which law states that the electromotive force (EMF) induced in a closed circuit is equal to the rate of change of magnetic flux through the circuit?

a) Faraday's law

b) Lenz's law

c) Ohm's law

d) Coulomb's law

Q16) What is the SI unit of inductance?

a) Henry

b) Tesla

c) Ohm

d) Ampere-turn

Q17) Which of the following is NOT a method to increase the induced EMF in a coil?

a) Increasing the number of turns in the coil

b) Increasing the strength of the magnetic field

c) Increasing the resistance of the coil

d) Increasing the rate of change of magnetic flux

Q18) Which type of transformer has more turns in the secondary coil compared to the primary coil?

a) Step-up transformer

b) Step-down transformer

c) Isolation transformer

d) Autotransformer

Q19) What is the efficiency of an ideal transformer?

a) 50%

b) 75%

c) 100%

d) Depends on the load connected

Q20) Which of the following phenomena is NOT based on electromagnetic induction?

a) Electric motors

b) Power generation in hydroelectric plants

c) Inductive charging of smartphones

d) Photoelectric effect