1. 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
2. Variable resistors are also known as:
A. Fixed resistors
B. Potentiometers
C. Thermistors
D. Photoresistors
Answer: B. Potentiometers
3. 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
4. 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
5. 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
6. In the resistor color code, the color red represents the value:
A. 1
B. 2
C. 3
D. 4
Answer: B. 2
7. A resistor has color bands: Brown, Black, Red, and Gold. Its resistance is:
A. 1 kΩ±5%1 \, \text{k}\Omega \pm 5\%
B. 10 kΩ±5%10 \, \text{k}\Omega \pm 5\%
C. 1.2 kΩ±5%1.2 \, \text{k}\Omega \pm 5\%
D. 100 kΩ±5%100 \, \text{k}\Omega \pm 5\%
Answer: A. 1 kΩ±5%1 \, \text{k}\Omega \pm 5\%
8. In a resistor color code, the multiplier is represented by the third band. What does the color green indicate for the multiplier?
A. 10310^3
B. 10510^5
C. 10610^6
D. 10910^9
Answer: B. 10510^5
9. A resistor has color bands: Yellow, Violet, Orange, and Silver. Its resistance is:
A. 47 kΩ±10%47 \, \text{k}\Omega \pm 10\%
B. 4.7 kΩ±10%4.7 \, \text{k}\Omega \pm 10\%
C. 470 kΩ±10%470 \, \text{k}\Omega \pm 10\%
D. 47 \, \text{\(\Omega} \pm 10% )
Answer: A. 47 kΩ±10%47 \, \text{k}\Omega \pm 10\%
10. 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
11. 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
12. 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
13. 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
14. 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
15. 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