What is the SI unit of electric current?
a) Volt
b) Ampere
c) Ohm
d) Watt
Which law states that the current flowing through a conductor is directly proportional to the voltage applied across it?
a) Ohm’s Law
b) Faraday’s Law
c) Kirchhoff’s Law
d) Coulomb’s Law
What is the primary function of a transformer?
a) Convert DC to AC
b) Store electrical energy
c) Change voltage levels
d) Generate electricity
Which subatomic particle is responsible for electricity?
a) Neutron
b) Proton
c) Electron
d) Photon
What happens to resistance when the length of a wire increases?
a) Increases
b) Decreases
c) Remains the same
d) Becomes zero
Which device is used to measure electric current?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Galvanometer
What is the unit of electrical power?
a) Joule
b) Newton
c) Watt
d) Coulomb
Which type of magnet retains its magnetism for a long time?
a) Temporary magnet
b) Permanent magnet
c) Electromagnet
d) Superconducting magnet
What is the magnetic field around a straight current-carrying wire?
a) Circular
b) Rectangular
c) Spiral
d) Square
Which of the following materials is the best conductor of electricity?
a) Rubber
b) Wood
c) Copper
d) Plastic
Which of the following devices converts electrical energy into mechanical energy?
a) Transformer
b) Generator
c) Electric Motor
d) Capacitor
What is the relationship between voltage, current, and resistance in Ohm’s law?
a) V = IR
b) I = VR
c) R = VI
d) V = I/R
Which law states that the total current entering a junction equals the total current leaving the junction?
a) Kirchhoff’s Voltage Law
b) Kirchhoff’s Current Law
c) Ohm’s Law
d) Faraday’s Law
What is the unit of magnetic field strength?
a) Tesla
b) Newton
c) Joule
d) Volt
What is the function of a capacitor in a circuit?
a) Convert AC to DC
b) Store electrical energy
c) Measure voltage
d) Reduce resistance
Which scientist discovered electromagnetic induction?
a) Isaac Newton
b) Albert Einstein
c) Michael Faraday
d) Nikola Tesla
What type of current is produced by batteries?
a) Alternating Current (AC)
b) Direct Current (DC)
c) Pulsating Current
d) Eddy Current
What is the purpose of a fuse in an electric circuit?
a) Store electrical charge
b) Protect against overcurrent
c) Reduce voltage
d) Increase current flow
Which component in an electric circuit opposes the flow of current?
a) Battery
b) Resistor
c) Transformer
d) Inductor
Which rule is used to determine the direction of induced current?
a) Ohm’s Law
b) Fleming’s Right-Hand Rule
c) Coulomb’s Law
d) Newton’s Third Law
Which type of circuit has only one path for current to flow?
a) Parallel circuit
b) Series circuit
c) Short circuit
d) Open circuit
Which device converts mechanical energy into electrical energy?
a) Motor
b) Generator
c) Transformer
d) Capacitor
What happens to the resistance of a conductor if its temperature increases?
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero
What does an inductor store?
a) Electrical energy
b) Magnetic energy
c) Heat energy
d) Chemical energy
Which of the following materials is a good insulator?
a) Silver
b) Gold
c) Rubber
d) Copper
What is the function of a diode in a circuit?
a) Convert AC to DC
b) Store energy
c) Measure resistance
d) Reduce current
What is the direction of magnetic field lines around a magnet?
a) North to South outside the magnet
b) South to North outside the magnet
c) Clockwise inside the magnet
d) Counterclockwise inside the magnet
Which of the following increases the strength of an electromagnet?
a) Decreasing current
b) Increasing the number of coils
c) Using a wooden core
d) Reducing voltage
Which of the following is a source of alternating current?
a) Battery
b) Solar cell
c) Generator
d) Capacitor
What does a voltmeter measure?
a) Current
b) Resistance
c) Voltage
d) Power
