IIPExam

What is the primary function of the button in a wireless doorbell project?

• To turn off the power

• To send a signal to the receiver

• To change the melody

• To control the volume 

Which component is typically used to play sound in a doorbell project?

• Servo motor

• Buzzer

• LED

• Resistor 

In a wireless doorbell system, what does the RF module do?

• It powers the LED

• It transmits and receives signals

• It plays melodies

• It measures distance 

What is the purpose of using a capacitor in a doorbell circuit?

• To increase resistance

• To store energy for sound output

• To reduce signal noise

• To amplify the signal 

Which Arduino pin type is commonly used to connect a push button in a doorbell project?

• Analog pin

• PWM pin

• Digital pin

• Ground pin 

What does PWM stand for?

• Pulse Width Modulation

• Pulse Wave Modulation

• Power Width Modulation

• Pulse Wave Management 

How many PWM-capable pins does an Arduino Uno have?

• 4

• 6

• 8

• 10 

Which function is used to set PWM values on an Arduino?

• analogRead()

• digitalWrite()

• analogWrite()

• pwmWrite() 

What is the range of values for PWM output on an Arduino?

• 0 to 100

• 0 to 255

• 0 to 1023

• 0 to 500 

In PWM, what does a duty cycle of 75% mean?

• The signal is on for 75% of the time and off for 25%

• The signal is off for 75% of the time and on for 25%

• The signal is always on

• The signal is always off