Virtual Labs

I/O Programming -Interfacing of Proximity switches and Relays

What does digitalWrite(11, HIGH) do in this experiment?

a: Reads sensor value Explanation

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b: Turns off relay Explanation

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c: Turns on relay Explanation

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d: Resets Arduino Explanation

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What component is controlled by the relay in this circuit?

a: Sensor Explanation

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b: LED Explanation

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c: Motor Explanation

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d: LCD Explanation

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Which function causes delay between relay switching?

a: delay() Explanation

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b: pause() Explanation

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c: wait() Explanation

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d: stop() Explanation

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How many terminals does a relay typically have (excluding coil)?

a: 2 Explanation

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b: 3 Explanation

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c: 4 Explanation

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d: 6 Explanation

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What is the function of NO (Normally Open) pin on the relay?

a: Always connected to COM Explanation

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b: For power input Explanation

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c: Ground connection Explanation

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d: Connected only when coil is energized Explanation

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What will happen if you connect relay GND to 5V?

a: Circuit won’t work Explanation

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b: Relay works fine Explanation

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c: LED glows permanently Explanation

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d: Arduino restarts Explanation

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Why use a relay instead of directly driving an LED with Arduino?

a: It's easier Explanation

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b: For learning Explanation

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c: Relay can handle higher loads Explanation

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d: Saves code Explanation

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What happens when the relay coil is energized?

a: NO connects to COM Explanation

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b: Nothing Explanation

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c: NC disconnects from COM Explanation

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d: LED blinks randomly Explanation

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Which pin sends control signals to relay?

a: GND Explanation

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b: VCC Explanation

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c: Analog pin 0 Explanation

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d: Digital pin 11 Explanation

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What is the delay in the given code?

a: 500ms Explanation

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b: 1000ms Explanation

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c: 2000ms Explanation

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d: No delay Explanation

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