Sample Questions and Answers
What is the basic unit of electric charge?
Volt
B. Ampere
C. Coulomb
D. Ohm
Answer: C
What does Ohm’s Law state?
Voltage is directly proportional to current and resistance.
B. Power equals the product of current and voltage.
C. Resistance is directly proportional to voltage and inversely proportional to current.
D. Voltage is inversely proportional to current.
Answer: A
Which of the following is a non-linear component in an electric circuit?
Resistor
B. Capacitor
C. Inductor
D. Diode
Answer: D
In a simple circuit, if the resistance is 10 ohms and the current is 2 amperes, what is the voltage across the resistor?
10 volts
B. 20 volts
C. 5 volts
D. 2 volts
Answer: B
Which law states that the sum of currents entering a junction equals the sum of currents leaving?
Ohm’s Law
B. Kirchhoff’s Voltage Law
C. Kirchhoff’s Current Law
D. Faraday’s Law
Answer: C
The unit of electric power is:
Ampere
B. Ohm
C. Watt
D. Volt
Answer: C
What type of current is used in most electronic devices?
Direct Current (DC)
B. Alternating Current (AC)
C. Square Wave
D. Sine Wave
Answer: A
What is the unit of capacitance?
Henry
B. Ampere
C. Farad
D. Volt
Answer: C
A 220V AC source is connected to a series circuit containing a 10 ohm resistor. What is the current in the circuit?
22 Amperes
B. 220 Amperes
C. 22 Milliamperes
D. 220 Milliamperes
Answer: A
The energy stored in a capacitor is given by which formula?
E = ½ C V²
B. E = C V
C. E = ½ L I²
D. E = V I t
Answer: A
Which component opposes the flow of electric current in a circuit?
Inductor
B. Resistor
C. Capacitor
D. Diode
Answer: B
What is the time constant of an RC circuit?
R + C
B. R × C
C. 1 / (R × C)
D. 1 / (R + C)
Answer: B
What is the effect of increasing resistance in a series circuit?
The current increases.
B. The current decreases.
C. The voltage increases.
D. The voltage stays the same.
Answer: B
In a parallel circuit, what happens to the total resistance as more resistors are added?
It increases.
B. It decreases.
C. It remains the same.
D. It becomes zero.
Answer: B
What is the purpose of a diode in a circuit?
To store electrical energy
B. To block current flow in one direction
C. To increase the voltage
D. To reduce power loss
Answer: B
A resistor has a value of 5 ohms. If the voltage across it is 10 volts, what is the current?
0.5 Amperes
B. 2 Amperes
C. 10 Amperes
D. 50 Amperes
Answer: B
Which of the following is a passive electrical component?
Transistor
B. Capacitor
C. LED
D. Diode
Answer: B
If the voltage in a circuit is doubled and the resistance remains the same, what happens to the current?
It doubles
B. It halves
C. It quadruples
D. It stays the same
Answer: A
The current through a resistor is 3 A and the resistance is 5 Ω. What is the power dissipated in the resistor?
15 W
B. 5 W
C. 3 W
D. 10 W
Answer: A
Which law relates the voltage, current, and resistance in an electrical circuit?
Kirchhoff’s Current Law
B. Ohm’s Law
C. Coulomb’s Law
D. Faraday’s Law
Answer: B
What is the equivalent capacitance of two capacitors of values 4 µF and 6 µF connected in series?
10 µF
B. 2.4 µF
C. 0.01 µF
D. 10,000 µF
Answer: B
Which of the following components stores energy in a magnetic field?
Capacitor
B. Resistor
C. Inductor
D. Diode
Answer: C
What happens to the total current in a parallel circuit as more branches are added?
It increases.
B. It decreases.
C. It remains constant.
D. It becomes zero.
Answer: A
Which of the following materials is a good conductor of electricity?
Rubber
B. Glass
C. Copper
D. Wood
Answer: C
What is the primary function of a capacitor in an AC circuit?
To store electrical energy temporarily
B. To increase resistance
C. To block AC current
D. To generate voltage
Answer: A
What type of electrical circuit is commonly used to distribute power in buildings?
Parallel circuit
B. Series circuit
C. Series-parallel circuit
D. Capacitive circuit
Answer: A
What is the unit of electrical resistance?
Ampere
B. Volt
C. Ohm
D. Watt
Answer: C
In which direction does current flow in a diode when it is forward biased?
From the anode to the cathode
B. From the cathode to the anode
C. In both directions
D. No current flows
Answer: A
What is the power consumed by a resistor if the current through it is 1.5 A and the voltage across it is 12 V?
18 W
B. 12 W
C. 1.5 W
D. 24 W
Answer: A
Which of the following laws is used to analyze voltage distribution in a circuit?
Kirchhoff’s Current Law
B. Coulomb’s Law
C. Kirchhoff’s Voltage Law
D. Ohm’s Law
Answer: C
31. Which of the following components is used to limit the current in a circuit?
Resistor
B. Capacitor
C. Diode
D. Inductor
Answer: A
32. The unit of electric current is:
Watt
B. Ampere
C. Volt
D. Ohm
Answer: B
33. If a 5 ohm resistor has 10 volts across it, what is the current through the resistor?
1 A
B. 2 A
C. 5 A
D. 10 A
Answer: B
34. What is the formula for power in an electrical circuit?
P = I²R
B. P = V² / R
C. P = VI
D. All of the above
Answer: D
35. What is the total resistance of three 10-ohm resistors connected in parallel?
30 ohms
B. 3.33 ohms
C. 10 ohms
D. 5 ohms
Answer: B
36. In an AC circuit, what does the RMS value of the voltage represent?
The peak value
B. The average value
C. The equivalent DC value
D. The instantaneous value
Answer: C
37. Which of the following describes a series circuit?
The current is the same in all parts of the circuit.
B. The voltage is the same across all components.
C. The total resistance is the sum of the individual resistances.
D. Both A and C
Answer: D
38. What happens to the current in a parallel circuit if one branch is removed?
The current stays the same.
B. The current decreases.
C. The current increases.
D. The current becomes zero.
Answer: B
39. The current through a 4-ohm resistor is 3 A. What is the voltage across the resistor?
7 V
B. 12 V
C. 15 V
D. 8 V
Answer: B
40. Which of the following laws is used to calculate the total voltage in a loop?
Ohm’s Law
B. Kirchhoff’s Voltage Law
C. Faraday’s Law
D. Coulomb’s Law
Answer: B
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