1.
A certain number of workers can complete a task in 20 days. If there were 4 fewer workers, it would take 10 more days to complete the task. How many workers are there?

2.
Which of the following tags is used to define a hyperlink in HTML?

3.
Which of the following is a block-level element in HTML?

4.
The distance between two cities is 500 kilometers. A car travels from the first city to the second city at an average speed of 50 kilometers per hour, and returns at an average speed of 60 kilometers per hour. What is the average speed for the entire round trip?

5.
A bag contains 3 red balls and 2 blue balls. If two balls are drawn at random without replacement, what is the probability that both balls are red?

6.
Which property is used to set the background color of an element in CSS?

7.
Which of the following is not a core module in Node.js?

8.
What is the result of the following expression: "5" === 5 ?

9.
Which lifecycle method is called after a component is rendered for the first time?

10.
Which property is used to change the font size of text in CSS?

11.
Which of the following is a popular web framework for Node.js?

12.
What does the type of operator in JavaScript return for an array?

13.
Which of the following is used to manage state in a React component?

14.
A sphere has a volume of 36π cubic units. What is the surface area of the sphere?

15.
A rectangular box has dimensions of 6 inches by 8 inches by 10 inches. What is the length of the diagonal of the box?