LDR,Signals and Resistance-Quiz

What is resistance in an electrical circuit?

• A type of battery

• A tool for measuring current

• A barrier to the flow of electric current

• A type of wire

What unit is used to measure resistance?

• Volts

• Amps

• Ohms

• Watts

How does a photoresistor (LDR) work?

• It produces light when electricity flows through it

• It changes resistance based on the amount of light it receives

• It stores electrical energy

• It converts light into sound

What happens to the resistance of a photoresistor when more light shines on it?

• The resistance increases

• The resistance decreases

• The resistance stays the same

• The resistance turns into voltage

Which of the following is an example of an analog signal?

• A light switch turning on and off

• The sound of a violin

• A computer processing data in 0s and 1s

• The blinking of an LED

Digital signals are represented by which of the following?

• Smooth waves

• Fixed values like 0s and 1s

• Continuous curves

• Random patterns

In an Arduino project, which pin is typically used to read analog input from a sensor like a photoresistor?

• Pin 13

• Pin A0

• Pin GND

• Pin 5V

What would happen if the resistance in a circuit is very high?

• More electricity would flow through

• Less electricity would flow through

• The circuit would explode

• The resistance would turn into a current

Which Arduino function is used to read analog signals?

• analogRead()
• digitalRead()

• digitalWrite()

• pinMode()

In an Arduino sketch, which function runs repeatedly after setup()?

• delay()

• loop()

• start()

• execute()