- What is the SI unit of electric current?
a) Volt
b) Ohm
c) Ampere
d) Watt
Answer: c) Ampere
- Which of the following materials is a good conductor of electricity?
a) Glass
b) Rubber
c) Copper
d) Wood
Answer: c) Copper
- What is the direction of electron flow in a circuit?
a) From positive to negative terminal
b) From negative to positive terminal
c) It depends on the type of circuit
d) None of the above
Answer: b) From negative to positive terminal
- Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?
a) Newton's Law
b) Coulomb's Law
c) Ohm's Law
d) Faraday's Law
Answer: c) Ohm's Law
- Which device is used to measure electric current?
a) Ammeter
b) Voltmeter
c) Ohmmeter
d) Wattmeter
Answer: a) Ammeter
- Which of the following statements is true regarding a series circuit?
a) The total resistance of the circuit is the sum of individual resistances.
b) The voltage across each component is the same.
c) The current through each component is the same.
d) All of the above
Answer: c) The current through each component is the same.
- What is the symbol for electric current?
a) V
b) I
c) R
d) Q
Answer: b) I
- What is the resistance of a circuit with a voltage of 12 V and a current of 2 A?
a) 6 Ω
b) 10 Ω
c) 24 Ω
d) 14 Ω
Answer: a) 6 Ω
- What is the relationship between voltage, current, and resistance in a circuit?
a) V = IR
b) I = VR
c) R = VI
d) None of the above
Answer: a) V = IR
- Which of the following materials is an insulator?
a) Copper
b) Aluminum
c) Rubber
d) Silver
Answer: c) Rubber
- What is the formula for power in an electric circuit?
a) Power = Voltage × Current
b) Power = Voltage/Current
c) Power = Current/Resistance
d) Power = Resistance/Current
Answer: a) Power = Voltage × Current
- What is the unit of power in an electric circuit?
a) Volt
b) Ohm
c) Ampere
d) Watt
Answer: d) Watt
- What is the unit of resistance?
a) Volt
b) Ohm
c) Ampere
d) Watt
Answer: b) Ohm
- What is the relationship between voltage and power in an electric circuit?
a) Power = Voltage/Resistance
b) Power = Voltage²/Resistance
c) Power = Current × Resistance
d) Power = Voltage × Current
Answer: d) Power = Voltage × Current
- What is a circuit breaker?
a) A device used to measure electric current
b) A device used to measure voltage
c) A device used to switch off a circuit in case of overcurrent
d) A device used to switch off a circuit in case of overvoltage
Answer: c) A device used to switch off a circuit in case of overcurrent
- What is the function of a fuse in an electric circuit?
a) To measure the current in the circuit
b) To regulate the voltage in the circuit
c) To switch off the circuit in case of overvoltage
d) To break the circuit in case of overcurrent
Answer: d) To break the circuit in case of overcurrent
- What is the difference between a conductor and an insulator?
a) Conductors allow electricity to flow through them, while insulators do not.
b) Insulators allow electricity to flow through them, while conductors do not.
c) Both conductors and insulators allow electricity to flow through them.
d) None of the above.
Answer: a) Conductors allow electricity to flow through them, while insulators do not.
- What is the purpose of grounding in an electrical system?
a) To reduce the voltage of the system
b) To provide a path for current to flow in case of a short circuit
c) To prevent electric shocks
d) All of the above
Answer: d) All of the above
- What is the purpose of a transformer in an electrical system?
a) To regulate the voltage of the system
b) To regulate the current of the system
c) To regulate the resistance of the system
d) To regulate the power of the system
Answer: a) To regulate the voltage of the system
- Which of the following is a type of electric current?
a) Direct current
b) Alternating current
c) Both direct and alternating current
d) None of
a) 50 Hz
b) 60 Hz
c) 100 Hz
d) 120 Hz
Answer: b) 60 Hz
- What is the symbol for a resistor?
a) R
b) C
c) L
d) P
Answer: a) R
- What is the formula for calculating the total resistance of resistors connected in parallel?
a) R = R1 + R2
b) R = (R1 × R2) / (R1 + R2)
c) R = 1 / (1/R1 + 1/R2)
d) R = R1 × R2
Answer: c) R = 1 / (1/R1 + 1/R2)
- What is the formula for calculating the total resistance of resistors connected in series?
a) R = R1 + R2
b) R = (R1 × R2) / (R1 + R2)
c) R = 1 / (1/R1 + 1/R2)
d) R = R1 × R2
Answer: a) R = R1 + R2
- What is the unit of capacitance?
a) Volt
b) Ohm
c) Ampere
d) Farad
Answer: d) Farad
- What is the unit of inductance?
a) Volt
b) Ohm
c) Ampere
d) Henry
Answer: d) Henry
- What is the formula for calculating the capacitance of a capacitor?
a) C = Q/V
b) C = V/Q
c) C = Q × V
d) C = V/Q
Answer: a) C = Q/V
- What is the formula for calculating the inductance of an inductor?
a) L = V/I
b) L = I/V
c) L = V × I
d) L = I/V²
Answer: c) L = V × I
- What is the purpose of a diode in an electrical circuit?
a) To regulate the voltage of the circuit
b) To provide a path for current to flow in one direction only
c) To measure the current in the circuit
d) To measure the voltage in the circuit
Answer: b) To provide a path for current to flow in one direction only
- What is the purpose of a transistor in an electrical circuit?
a) To regulate the voltage of the circuit
b) To amplify or switch electronic signals
c) To measure the current in the circuit
d) To measure the voltage in the circuit
Answer: b) To amplify or switch electronic signals