Resistors: types, color coding, and applications MCQs

Q1: Which of the following is NOT a type of resistor?
(A) Carbon film resistor
(B) Wire-wound resistor
(C) Capacitive resistor
(D) Metal oxide resistor
Answer: (C) Capacitive resistor

Q2: Variable resistors are also known as:
(A) Fixed resistors
(B) Potentiometers
(C) Thermistors
(D) Photoresistors
Answer: (B) Potentiometers

Q3: A thermistor is a type of resistor whose resistance:
(A) Decreases with temperature
(B) Increases with temperature
(C) Depends on the material
(D) Can either increase or decrease with temperature
Answer: (D) Can either increase or decrease with temperature

Q4: Which type of resistor is commonly used for high-precision applications?
(A) Carbon film resistor
(B) Wire-wound resistor
(C) Metal film resistor
(D) Variable resistor
Answer: (C) Metal film resistor

Q5: Light-dependent resistors (LDRs) are primarily used in:
(A) High-voltage circuits
(B) Light-sensitive circuits
(C) Temperature control systems
(D) Motor speed control
Answer: (B) Light-sensitive circuits

Resistor Color Coding

Q6: In the resistor color code, the color red represents the value:
(A) 1
(B) 2
(C) 3
(D) 4
Answer: (B) 2

Q7: A resistor has color bands: Brown, Black, Red, and Gold. Its resistance is:
(A) 1 kΩ ±5%
(B) 10 kΩ ±5%
(C) 1.2 kΩ ±5%
(D) 100 kΩ ±5%
Answer: (A) 1 kΩ ±5%

Q8: In a resistor color code, the multiplier is represented by the third band. What does the color green indicate for the multiplier?
(A) $10^3$
(B) $10^5$
(C) $10^6$
(D) $10^9$
Answer: (B) $10^5$

Q9: A resistor has color bands: Yellow, Violet, Orange, and Silver. Its resistance is:
(A) 47 kΩ ±10%
(B) 4.7 kΩ ±10%
(C) 470 kΩ ±10%
(D) 47 Ω ±10%
Answer: (A) 47 kΩ ±10%

Q10: What does the fourth band in a 4-band resistor indicate?
(A) Resistance value
(B) Multiplier
(C) Tolerance
(D) Power rating
Answer: (C) Tolerance

Applications of Resistors

Q11: Resistors are used in electronic circuits to:
(A) Store charge
(B) Control current
(C) Convert AC to DC
(D) Increase power
Answer: (B) Control current

Q12: Which of the following is an application of a variable resistor?
(A) Voltage dividers
(B) Speed control in fans
(C) Light dimming
(D) All of the above
Answer: (D) All of the above

Q13: In a voltage divider circuit, the function of resistors is to:
(A) Decrease voltage to a required level
(B) Increase the current
(C) Block alternating current
(D) Amplify signals
Answer: (A) Decrease voltage to a required level

Q14: Power resistors are commonly used in:
(A) High-frequency circuits
(B) Current limiting applications
(C) Low-power signal circuits
(D) Battery-powered devices
Answer: (B) Current limiting applications

Q15: The main role of resistors in LED circuits is to:
(A) Increase brightness
(B) Prevent overheating of LEDs
(C) Limit current through the LEDs
(D) Change LED color
Answer: (C) Limit current through the LEDs