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Quiz: GPIO Programming and Hardware Projects

Test your understanding of GPIO, sensors, and IoT concepts.

1. What does GPIO stand for?

  1. General Processor Interface Output
  2. General Purpose Input/Output
  3. Graphical Processing Input/Output
  4. Ground Power Input/Output
Show Answer

The correct answer is B. GPIO (General Purpose Input/Output) refers to pins that can be programmed as either inputs (reading sensors) or outputs (controlling LEDs, motors, etc.) for interfacing with external hardware.

Concept Tested: GPIO Pins

See: Chapter 20 - GPIO Overview

2. What are the three main types of pins on the Raspberry Pi GPIO header?

  1. USB, HDMI, and Ethernet
  2. Power (5V/3.3V), Ground, and GPIO data pins
  3. Input, Output, and Bidirectional
  4. Serial, Parallel, and Network
Show Answer

The correct answer is B. The 40-pin header contains power pins (5V and 3.3V), ground pins (essential for completing circuits), and GPIO data pins (programmable for input/output).

Concept Tested: GPIO Pin Types

See: Chapter 20 - Pin Types

3. What is I2C used for?

  1. Internet 2 Connection
  2. A communication protocol for connecting multiple devices with two wires
  3. A type of camera interface
  4. Internal to Core processing
Show Answer

The correct answer is B. I2C (Inter-Integrated Circuit) is a serial communication protocol that uses just two wires (SDA for data, SCL for clock) to connect multiple devices like sensors and displays to the Pi.

Concept Tested: I2C Protocol

See: Chapter 20 - I2C

4. What happens if you connect a 5V sensor directly to a GPIO pin?

  1. It works perfectly
  2. It can damage the Raspberry Pi (GPIO uses 3.3V logic)
  3. The sensor won't power on
  4. It automatically converts the voltage
Show Answer

The correct answer is B. GPIO pins use 3.3V logic and are not 5V tolerant. Connecting 5V directly can fry the Pi! Use a level shifter or voltage divider when interfacing with 5V devices.

Concept Tested: GPIO Voltage Safety

See: Chapter 20 - Voltage Safety

5. What Python library is commonly used for GPIO programming on Raspberry Pi?

  1. NumPy
  2. RPi.GPIO or gpiozero
  3. Flask
  4. Pandas
Show Answer

The correct answer is B. RPi.GPIO is the traditional library for GPIO control, while gpiozero provides a simpler, beginner-friendly interface. Both are included in Raspberry Pi OS.

Concept Tested: GPIO Programming

See: Chapter 20 - GPIO Libraries

6. What is PWM and what is it used for?

  1. Power With Modulation - power saving
  2. Pulse Width Modulation - controlling brightness, motor speed, servos
  3. Programmed Wave Management - audio output
  4. Pin Wire Management - cable organization
Show Answer

The correct answer is B. PWM (Pulse Width Modulation) rapidly switches a pin on/off to simulate analog output. It's used to dim LEDs, control motor speeds, and position servo motors by varying the duty cycle.

Concept Tested: PWM

See: Chapter 20 - PWM

7. What is IoT?

  1. Input of Technology
  2. Internet of Things - connected smart devices
  3. Integrated Output Terminal
  4. Internal Operation Test
Show Answer

The correct answer is B. IoT (Internet of Things) refers to physical devices connected to the internet that can collect and share data. Examples include smart thermostats, security cameras, and sensor networks.

Concept Tested: IoT Concept

See: Chapter 20 - IoT

8. What is MQTT commonly used for in IoT projects?

  1. Multi-Query Translation Tool
  2. A lightweight messaging protocol for IoT devices
  3. Media Quality Transfer Technology
  4. Multi-platform Query Testing
Show Answer

The correct answer is B. MQTT (Message Queuing Telemetry Transport) is a lightweight publish-subscribe messaging protocol perfect for IoT devices. It's designed for low-bandwidth, high-latency networks.

Concept Tested: MQTT Protocol

See: Chapter 20 - MQTT

9. What is a breadboard used for?

  1. Cutting bread into circuits
  2. Prototyping electronic circuits without soldering
  3. Mounting the Raspberry Pi
  4. Storing electronic components
Show Answer

The correct answer is B. A breadboard is a reusable prototyping board with internal connections that lets you build and test circuits without soldering. Components and jumper wires plug into holes to create circuits.

Concept Tested: Breadboard

See: Chapter 20 - Breadboard

10. What does SPI stand for and what is it used for?

  1. Simple Programming Interface - basic coding
  2. Serial Peripheral Interface - fast communication with displays, sensors
  3. System Process Information - debugging
  4. Secure Protocol Internet - encryption
Show Answer

The correct answer is B. SPI (Serial Peripheral Interface) is a fast synchronous communication protocol used for high-speed devices like displays, SD cards, and some sensors. It uses more wires than I2C but is faster.

Concept Tested: SPI Protocol

See: Chapter 20 - SPI