Chemistry Quiz Application

This Node.js application runs a timed chemistry quiz based on a set of predefined questions stored in a JSON file.

Features

• Randomly selects 10 questions from a pool of chemistry questions generated from the chemistry Gaia node
• 
• 10-second timer for each question
• 5 points awarded for correct answers, 0 for incorrect answers
• No ability to return to previous questions
• Displays total score at the end of the quiz

Prerequisites

• Node.js installed on your system
• quiz_data.json file in the same directory as the script

Setup

1. Save the provided JavaScript code in a file named index.js.
2. Ensure quiz_data.json is in the same directory as index.js.

Running the Application

Run the following command in your terminal:

node index.js

Code Structure

The application is structured as follows:

1. Importing Required Modules:

   • readline for handling user input
   • fs for reading the JSON file

2. Data Loading and Preparation:

   • Reads and parses the quiz_data.json file
   • Shuffles the questions randomly using the shuffleArray function

3. Quiz Logic:

   • askQuestion(): Main function that handles asking questions, timing, and scoring
   • endQuiz(): Displays the final score and closes the readline interface

4. User Interaction:

   • Uses readline to get user input for answers
   • Provides immediate feedback on correct/incorrect answers

5. Timing Mechanism:

   • Uses setInterval to create a 10-second countdown for each question

Key Functions

• shuffleArray(array): Randomizes the order of elements in an array
• askQuestion(): Manages the flow of the quiz, including displaying questions, handling user input, and timing
• endQuiz(): Concludes the quiz and displays the final score

Quiz Flow

1. The application starts by welcoming the user and explaining the rules.
2. For each question:
   • The question and options are displayed.
   • A 10-second timer starts.
   • The user can input their answer (1-4).
   • If the timer expires before an answer is given, the quiz moves to the next question.
   • Immediate feedback is provided for each answer.
3. After all questions are answered or timed out, the total score is displayed.

Customization

To modify the quiz questions or add more, edit the quiz_data.json file. Ensure each question object has:

• A question field (string)
• An options field (array of strings)
• A correctAnswer field (string matching one of the options)

Limitations & Next Steps

• Console-based interface
• No persistence of scores between runs
• Fixed number of questions and time per question