Why understanding hardware builds intuition in Intro to Computing - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the number of CPU cores available on the system.

Intro to Computing

import os
cores = os.cpu_count()
print('CPU cores:', [1])

Drag options to blanks, or click blank then click option'

Acpu_count

Bos

Ccores

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using the function name instead of the variable.

Trying to print the module name.

The variable cores stores the number of CPU cores returned by os.cpu_count(). We print this variable to show the count.

2fill in blank

medium

Complete the code to calculate the total memory in bytes using the given hardware info dictionary.

Intro to Computing

hardware_info = {'memory_gb': 8}
total_bytes = hardware_info['memory_gb'] * [1]
print('Total memory in bytes:', total_bytes)

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A1024 * 1024 * 1024

B1024 * 1024

C1000 * 1000 * 1000

D1024

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1000 instead of 1024 for conversion.

Multiplying by 1024 only once or twice.

1 GB equals 1024³ bytes (1024 * 1024 * 1024). Multiplying memory in GB by this converts it to bytes.

3fill in blank

hard

Fix the error in the code to correctly calculate the CPU speed in MHz from GHz.

Intro to Computing

cpu_speed_ghz = 3.5
cpu_speed_mhz = cpu_speed_ghz [1] 1000
print('CPU speed in MHz:', cpu_speed_mhz)

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A/

B-

C+

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using division or addition instead of multiplication.

Confusing units.

To convert GHz to MHz, multiply by 1000 because 1 GHz = 1000 MHz.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps each device name to its RAM size in MB.

Intro to Computing

devices = {'laptop': 8, 'tablet': 4, 'phone': 2}
ram_mb = { [1]: [2] * 1024 for [1] in devices }

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Adevice

Bdevices[device]

Cram

Ddevice_name

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names.

Not multiplying RAM size by 1024.

The comprehension iterates over device names as device. For each, it maps the device name to its RAM in MB by multiplying the GB value by 1024.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that includes only devices with RAM greater than 3 GB, converting RAM to MB.

Intro to Computing

devices = {'laptop': 8, 'tablet': 4, 'phone': 2}
filtered_ram = { [1]: devices[[2]] * 1024 for [3] in devices if devices[[2]] > 3 }

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Aname

Ddevice

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Not filtering correctly.

The comprehension uses name as the loop variable and key. It filters devices with RAM > 3 GB and converts RAM to MB.