Virtual Labs

Tools

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Understanding the Concepts of Smart Contracts Using Solidity

Choose difficulty:

Beginner

Intermediate

Advanced

In Solidity, which keyword is used to define a constructor in a class?

a: init Explanation

Explanation

b: create Explanation

Explanation

c: constructor Explanation

Explanation

d: setup Explanation

Explanation

Why are gas fees required in Ethereum transactions, and how are they determined?

a: Gas fees are used to purchase Ether; they are fixed for all transactions. Explanation

Explanation

b: Gas fees are required to compensate miners for computation; they vary based on the computational complexity of the transaction. Explanation

Explanation

c: Gas fees are optional and depend on the user's preference Explanation

Explanation

d: Gas fees are waived for transactions involving smart contracts. Explanation

Explanation

What is the primary purpose of the mapping keyword in Solidity?

a: To create loops Explanation

Explanation

b: To define a dynamic array Explanation

Explanation

c: To implement key-value pairs Explanation

Explanation

d: To handle exceptions Explanation

Explanation

Community Links Sakshat Portal Outreach Portal FAQ: Virtual Labs

AGPL 3.0 & Creative Commons (CC BY-NC-SA 4.0)