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Quiz 2: Basics

Overview

This quiz covers the following parts of the Substrate Knowledge Map:

1. What language compiler/interpreter do you need to install in your local machine to compile Substrate?

  • A. gcc
  • B. node
  • C. rustc
  • D. ruby
  • E. python

2. What OS platform could you use to compile Substrate? Check all that apply.

  • A. Windows
  • B. macOS
  • C. Linux
  • D. Android

3. Why do we need both the rust stable and rust nightly versions installed to compile Substrate?

  • A. We want to make sure our binaries support the upcoming features in rust nightly version.
  • B. To test our compiled binaries support features in both rust stable and rust nightly.
  • C. We want to build Substrate projects in both native binary (using rust stable), and Wasm binary (which requires rust nightly).
  • D. We want both binaries to verify the stability of our code.

4. What operations could you perform using Polkadot-JS Apps? Check all that apply.

  • Inspect the block information of a Substrate network.
  • Send extrinsics to a Substrate network.
  • With an embedded javascript editor, you could write javascript to interact with the connected Substrate network.
  • Can act as a faucet of a Substrate network, and acquire a small amount of Substrate tokens.
  • Can sign an arbitrary message with a user account.

5. Which of the following are WRONG about Polkadot-JS Apps? Check all that apply.

  • You can only see the block information of the latest block of a Substrate-based network with Polkadot-JS Apps.
  • You can run a local version as well as using the hosted version of Polkadot-JS Apps.
  • You can use Polakdot-JS Apps to connect to Bitcoin and Ethereum networks.
  • You can inspect a user account in Polkadot-JS Apps but not creating a new one. You need a browser plugin to do so.
  • We need to specify our own custom data type in Polkadot-JS Apps is because Substrate sent a series of bytes to its clients. So developers need to tell the Apps how to decode and interpret these bytes.

6. If you added custom data type in Substrate runtime, what do you need to do on Polkadot-JS Apps side to for the Apps to support this Substrate network?

  • In the Settings > Metadata tab, add the custom data definition in JSON form.
  • In the Settings > Developer tab, add the custom data definition in XML form.
  • In the Settings > Developer tab, add the custom data definition in JSON form.
  • In the Toolbox > Sign message tab, sign a message with the sudo user account for confirmation.
  • In the Toolbox > Verify signature tab, verify the signature coming from a sudo user account for confirmation.