Why scaling solves blockchain limitations - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the maximum number of transactions per block.

Blockchain / Solidity

MAX_TRANSACTIONS = [1]

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

A10000

B1000

C100

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing too low a number limits throughput.

Choosing too high a number may cause block size issues.

The maximum transactions per block is set to 1000 to allow more transactions and improve throughput.

2fill in blank

medium

Complete the code to increase the block size limit for scaling.

Blockchain / Solidity

block_size_limit = [1]  # in megabytes

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

A8

B20

C0.5

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Setting block size too small limits transactions.

Too large block size can cause network delays.

Increasing the block size limit to 8 MB allows more data per block, improving scalability.

3fill in blank

hard

Fix the error in the code that calculates transactions per second (TPS).

Blockchain / Solidity

tps = total_transactions / [1]  # seconds per block

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

Ablock_time

Bblock_size

Ctransaction_fee

Dblock_height

Attempts:

3 left

💡 Hint

Common Mistakes

Using block size instead of block time.

Using unrelated variables like transaction fee.

TPS is calculated by dividing total transactions by the block time in seconds.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps block numbers to their sizes if size is less than 8 MB.

Blockchain / Solidity

block_sizes = {block_num: size for block_num, size in blocks.items() if size [1] [2]

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

A<

B8

C>

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using greater than instead of less than.

Using wrong size value.

The comprehension filters blocks with size less than 8 MB to manage scalability.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps block IDs (uppercase) to their transaction counts if count is greater than 1000.

Blockchain / Solidity

filtered_blocks = { [1]: [2] for block_id, count in blocks.items() if count [3] 1000}

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

Ablock_id.upper()

Bcount

C>

Dblock_id.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using lower() instead of upper().

Using less than operator instead of greater than.

This comprehension filters blocks with more than 1000 transactions and maps uppercase block IDs to counts.