What is Raspberry Pi - Practice Questions & Exercises

Challenge - 5 Problems

🧠 Conceptual

intermediate

What is the primary purpose of a Raspberry Pi?

Choose the best description of what a Raspberry Pi is mainly used for.

A A high-end gaming console designed for playing the latest video games.

B A small, affordable computer used for learning programming and electronics projects.

C A smartphone designed for making calls and sending messages.

D A cloud server used for hosting large websites and applications.

💡 Hint

Think about a device that helps beginners learn coding and build simple projects.

The Raspberry Pi is a tiny, low-cost computer designed to help people learn programming and create electronics projects. It is not a gaming console, smartphone, or cloud server.

❓ Predict Output

intermediate

What will this Python code print on a Raspberry Pi?

Assuming you run this Python code on a Raspberry Pi, what will be the output?

Raspberry Pi

import platform
print(platform.machine())

A i386

B x86_64

C armv7l

D mips

💡 Hint

Raspberry Pi uses an ARM processor architecture.

The Raspberry Pi uses an ARM processor, so the platform.machine() function returns 'armv7l' or similar ARM architecture string, not x86 or i386.

🔧 Debug

advanced

Why does this Raspberry Pi GPIO code raise an error?

Look at this Python code snippet for controlling a Raspberry Pi GPIO pin. Why does it raise an error?

Raspberry Pi

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BOARD)
GPIO.setup(18, GPIO.OUT)
GPIO.output(18, True)

A Pin 18 is invalid in BOARD mode; it should be a pin number from 1 to 40.

B GPIO.setmode must be called after GPIO.setup.

C GPIO.output requires a string pin name, not an integer.

D The code is correct and will not raise an error.

💡 Hint

BOARD mode uses physical pin numbers, not BCM GPIO numbers.

In BOARD mode, pin numbers correspond to physical pins on the header (1 to 40). Pin 18 is a BCM GPIO number, not a BOARD pin number, so using 18 causes an error.

📝 Syntax

advanced

Which option correctly initializes SPI communication on Raspberry Pi in Python?

Choose the correct Python code snippet to initialize SPI communication using the spidev library on a Raspberry Pi.

A

import spidev
spi = spidev.SpiDev()
spi.open(0, 0)
spi.max_speed_hz = 50000

B

import spidev
spi = spidev.SpiDev()
spi.open(1, 0)

C

import spidev
spi = spidev.SpiDev
spi.open(0, 0)

D

import spidev
spi = spidev.SpiDev()
spi.open(0, 0)

💡 Hint

Check for correct class name casing and method calls.

Option A correctly creates an instance of SpiDev with correct casing, opens bus 0 device 0, and sets max speed. Option A misses setting speed, C misses parentheses for class instantiation, D opens bus 1 which may not be available.

🚀 Application

expert

How many GPIO pins are available for general use on a Raspberry Pi 4 Model B?

Consider the Raspberry Pi 4 Model B's 40-pin header. How many pins can you use as general-purpose input/output (GPIO) pins?

A 17 pins

B 28 pins

C 40 pins

D 26 pins

💡 Hint

Not all 40 pins are GPIO; some are power, ground, or special function pins.

The Raspberry Pi 4 Model B has 40 pins on its header, but only 26 of these are usable as GPIO pins. The rest are power, ground, or reserved pins.