SS1 Third Term Basic Electronics Past Questions And Answers
20 Basic electronics questions for SS1 Third Term, along with options and answers:
Question: What is the purpose of a varistor in an electronic circuit?
A) To regulate voltage
B) To control current flow
C) To protect against voltage surges
D) To amplify signals
Answer: C) To protect against voltage surges
Question: What is the unit of frequency modulation (FM)?
A) Hertz
B) Megahertz
C) Kilohertz
D) Gigahertz
Answer: A) Hertz
Question: Which electronic component is often used as a switch in digital circuits?
A) Capacitor
B) Resistor
C) Transistor
D) Inductor
Answer: C) Transistor
Question: What is the primary function of a Schottky diode?
A) To regulate voltage
B) To control current flow
C) To amplify signals
D) To provide low forward voltage drop
Answer: D) To provide low forward voltage drop
Question: Which law states that the total power in a circuit is equal to the sum of the individual power values?
A) Ohm’s Law
B) Kirchhoff’s Current Law
C) Kirchhoff’s Voltage Law
D) Watt’s Law
Answer: D) Watt’s Law
Question: The process of converting analog signals to digital signals is called:
A) Modulation
B) Demodulation
C) Amplification
D) Analog-to-Digital Conversion (ADC)
Answer: D) Analog-to-Digital Conversion (ADC)
Question: What is the purpose of a flyback diode in a circuit?
A) To regulate voltage
B) To control current flow
C) To protect against voltage spikes in inductive loads
D) To amplify signals
Answer: C) To protect against voltage spikes in inductive loads
Question: The SI unit of magnetic field strength is:
A) Tesla
B) Gauss
C) Weber
D) Henry
Answer: A) Tesla
Question: Which type of logic gate performs the AND operation?
A) OR gate
B) AND gate
C) NOT gate
D) XOR gate
Answer: B) AND gate
Question: In digital electronics, what is the binary representation of the decimal number 10?
A) 1010
B) 1100
C) 1111
D) 1001
Answer: A) 1010
Question: What is the function of a thyristor in a circuit?
A) To regulate voltage
B) To control current flow
C) To amplify signals
D) To switch high-power loads
Answer: D) To switch high-power loads
Question: Which component is commonly used as a memory storage device in computers?
A) Transistor
B) Capacitor
C) Inductor
D) Hard Disk Drive (HDD)
Answer: D) Hard Disk Drive (HDD)
Question: What does the acronym PCB stand for in electronics?
A) Printed Circuit Board
B) Power Control Block
C) Programmable Circuit Buffer
D) Processor Control Board
Answer: A) Printed Circuit Board
Question: Which type of display technology uses organic compounds to emit light?
A) LCD (Liquid Crystal Display)
B) LED (Light Emitting Diode)
C) OLED (Organic Light Emitting Diode)
D) CRT (Cathode Ray Tube)
Answer: C) OLED (Organic Light Emitting Diode)
Question: The unit of electric power is also equal to one joule per second. What is this unit called?
A) Watt
B) Volt
C) Ampere
D) Ohm
Answer: A) Watt
Question: What is the purpose of a photoresistor in a circuit?
A) To regulate voltage
B) To control current flow
C) To vary resistance based on light intensity
D) To store charge
Answer: C) To vary resistance based on light intensity
Question: Which type of memory retains data even when the power is turned off?
A) RAM (Random Access Memory)
B) ROM (Read-Only Memory)
C) Cache Memory
D) Flash Memory
Answer: B) ROM (Read-Only Memory)
Question: What is the function of a optocoupler in electronics?
A) To regulate voltage
B) To control current flow
C) To provide electrical isolation between input and output
D) To amplify signals
Answer: C) To provide electrical isolation between input and output
Question: Which component is used to store data in binary form in digital systems?
A) Transistor
B) Capacitor
C) Flip-Flop
D) Inductor
Answer: C) Flip-Flop
Question: What is the purpose of a Hall effect sensor in electronics?
A) To regulate voltage
B) To measure magnetic fields
C) To control current flow
D) To amplify signals
Answer: B) To measure magnetic fields.