Yield farming concepts in Blockchain / Solidity - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Yield Farming Rewards

In yield farming, users provide liquidity to a pool and earn rewards. Which of the following best describes how rewards are typically calculated?

A Rewards are randomly assigned to users each day.

B Rewards are proportional to the amount of liquidity a user provides relative to the total pool.

C Rewards depend only on the time a user has held tokens, not the amount provided.

D Rewards are fixed and distributed equally regardless of the amount provided.

💡 Hint

Think about fairness in sharing rewards based on contribution size.

In yield farming, rewards are usually proportional to the liquidity a user provides compared to the total pool. This ensures users who contribute more get more rewards.

❓ Predict Output

intermediate

Calculate User Share in a Liquidity Pool

Given the following Python code that calculates a user's share percentage in a liquidity pool, what is the output?

Blockchain / Solidity

total_liquidity = 1000
user_liquidity = 250
user_share = (user_liquidity / total_liquidity) * 100
print(f"User share: {user_share:.1f}%")

A User share: 250.0%

B User share: 2.5%

C User share: 0.25%

D User share: 25.0%

💡 Hint

Divide user liquidity by total liquidity and multiply by 100 to get percentage.

The user provides 250 out of 1000 total liquidity, so the share is (250/1000)*100 = 25.0%.

❓ Predict Output

advanced

Yield Farming Reward Calculation with Variable Rates

Consider this Python function that calculates rewards based on liquidity and a variable reward rate. What is the output when calling calculate_rewards(500, 0.05)?

Blockchain / Solidity

def calculate_rewards(liquidity, reward_rate):
    return liquidity * reward_rate

print(calculate_rewards(500, 0.05))

A 500.05

B 10.0

C 25.0

D 0.025

💡 Hint

Multiply liquidity by reward rate to get rewards.

500 * 0.05 equals 25.0, which is the reward amount.

🔧 Debug

advanced

Identify the Error in Reward Distribution Code

What error will this Python code produce when run?

Blockchain / Solidity

rate = 0.1
rewards = {user: liquidity * rate for user, liquidity in [('Alice', 100), ('Bob', 200)]}
print(rewards)

A {'Alice': 10.0, 'Bob': 20.0}

B TypeError due to wrong multiplication

C NameError because 'rate' is used before assignment

D SyntaxError in dictionary comprehension

💡 Hint

Check the order of variable definitions and usage.

The variable 'rate' is used inside the dictionary comprehension before it is defined, causing a NameError.

🧠 Conceptual

expert

Risks in Yield Farming Strategies

Which of the following is the most significant risk unique to yield farming compared to traditional savings?

A Smart contract vulnerabilities causing loss of funds

B Inflation risk reducing the value of rewards

C Interest rate changes by central banks

D Bank insolvency leading to loss of deposits

💡 Hint

Think about what can go wrong specifically in blockchain-based yield farming.

Yield farming involves smart contracts which can have bugs or be exploited, risking users' funds. This risk is unique compared to traditional savings.