JavaScript Fundamentals Quiz II

Which statement best describes a computer program?

• A list of images displayed by a computer

• A list of instructions executed by a computer

• A list of files stored on a computer

• A list of websites visited on a computer

Which statement about JavaScript is most accurate?

• It can run only inside web browsers

• It requires a paid license to run in browsers

• It is built into modern browsers and can also run on servers via Node.js

• It can only run on mobile devices

In JavaScript, a single-line comment starts with:

• <!--

• #

• //

• /*

Which keyword is NOT used to declare variables in modern JavaScript?

• let

• var

• const

• int

JavaScript is best described as:

• Strongly typed and statically checked

• Loosely typed and dynamically checked

• Untyped and compiled

• Strictly typed and compiled

Which option correctly distinguishes keywords from identifiers?

• Keywords can be redefined by the programmer; identifiers cannot

• Identifiers are reserved by the language; keywords are user-defined

• Keywords are reserved by the language; identifiers are user-defined names

• Both keywords and identifiers are reserved words

Which statement about identifiers is true in JavaScript?

• Identifiers are not case-sensitive

• Identifiers may start with a digit

• Identifiers are case-sensitive and may start with _ or $

• Identifiers must always be uppercase

Which statement best explains var vs let?

• They behave identically in all scopes

• let is block-scoped; var is function-scoped and hoisted

• let is function-scoped; var is block-scoped

• Both are block-scoped and not hoisted

Which statement about const is correct?

• A const must be initialized at declaration

• A const can be reassigned once

• A const is not case-sensitive

• A const must hold a number

What does "use strict" primarily do?

• Enables TypeScript features in plain JS

• Disables all runtime errors

• Enforces stricter parsing and error handling rules

• Forces the code to compile before running