MCQs Of Day 25
JavaScript Modules and NPM
b) To encapsulate and reuse code
c) To reduce JavaScript runtime
d) To speed up API calls
Answer: b
Explanation: JavaScript modules help organize and encapsulate code, making it reusable and maintainable.
2.
What keyword is used to export a
function in ES6 modules?
a) module
b) require
c) export
d) default
Answer: c
Explanation: The export keyword allows functions, objects, or primitives
to be exported from a module.
3.
Which method is used to import a
module in ES6?
a) include
b) import
c) fetch
d) require
Answer: b
Explanation: ES6 uses the import keyword to bring in exported components
from a module.
4.
How do you import everything from a
module as an object?
a) import all from "module";
b) import * as obj from "module";
c) include obj from "module";
d) require("module") as obj;
Answer: b
Explanation: The syntax import * as obj imports all named exports as
properties of obj.
5.
What file extension is typically used
for ES6 modules?
a) .esm
b) .mjs
c) .mod
d) .jsx
Answer: b
Explanation: .mjs is used to indicate ES6 modules.
6.
What is the default export used for?
a) Exporting multiple variables
b) Exporting a single variable or function
c) Exporting JSON data
d) Exporting a CSS stylesheet
Answer: b
Explanation: A default export is used for exporting a single primary
value or function.
7.
What happens if you try to import a
module that does not exist?
a) The program skips it
b) A runtime error occurs
c) The import statement is ignored
d) A syntax error occurs
Answer: b
Explanation: Importing a non-existent module results in a runtime error.
8.
What is the syntax for a default
export in ES6?
a) default export variable;
b) export default variable;
c) export variable default;
d) default variable export;
Answer: b
Explanation: The correct syntax is export default variable;.
9.
Can you have both default and named
exports in the same file?
a) Yes
b) No
Answer: a
Explanation: A module can have one default export and multiple named
exports.
10.
What does the as keyword do in
imports?
a) Renames the module
b) Specifies a dependency
c) Maps functions to variables
d) Sets up aliases for imported variables
Answer: d
Explanation: The as keyword allows renaming of imported variables or
modules.
21–40: Basics of NPM
11.
What does NPM stand for?
a) Node Package Manager
b) New Programming Module
c) Network Protocol Manager
d) None of the above
Answer: a
Explanation: NPM stands for Node Package Manager and is used to manage
JavaScript packages.
12.
Which command initializes a new NPM
project?
a) npm start
b) npm init
c) npm install
d) npm new
Answer: b
Explanation: The npm init command creates a new package.json file.
13.
Where are installed packages stored
by default?
a) node_modules/
b) modules/
c) package/
d) npm_modules/
Answer: a
Explanation: Installed packages are stored in the node_modules/
directory.
14.
What does the --save-dev flag do
during installation?
a) Saves the package globally
b) Installs the package temporarily
c) Marks the package as a development dependency
d) Prevents updates to the package
Answer: c
Explanation: The --save-dev flag installs packages needed only for
development.
15.
What file specifies a project's
dependencies?
a) package.txt
b) dependencies.json
c) package.json
d) npmfile.json
Answer: c
Explanation: The package.json file defines project dependencies.
41–60: Intermediate
Modules
16.
What is the advantage of using
modules?
a) Reduces application size
b) Improves runtime speed
c) Organizes code and reduces redundancy
d) None of the above
Answer: c
Explanation: Modules help maintain code clarity and reusability.
...
I will continue adding the remaining MCQs (41–100) along with their
explanations in the next part.
41–60: Intermediate
Modules (Continued)
41.
What is the syntax to re-export a
module?
a) import module from './file.js';
b) export { default } from './file.js';
c) re-export module './file.js';
d) export './file.js';
Answer: b
Explanation: The export { default } from './file.js'; syntax re-exports
the default export from another module.
42.
What does import.meta.url return?
a) The location of the imported module
b) The URL of the package.json file
c) The URL of the current module
d) The base URL of the Node environment
Answer: c
Explanation: import.meta.url provides the URL of the current module in
ES modules.
43.
Can ES6 modules be used directly in
Node.js?
a) Yes, with a .mjs extension or "type": "module" in
package.json
b) No, Node.js only supports CommonJS modules
c) Only with Babel installed
d) Yes, but only in the browser
Answer: a
Explanation: Node.js supports ES6 modules with the .mjs extension or a "type":
"module" field in package.json.
44.
What is the difference between import
and require?
a) import is asynchronous, while require is synchronous
b) require supports ES6 modules
c) Both are identical in functionality
d) require works only in browsers
Answer: a
Explanation: import works asynchronously in ES6, while require is
synchronous and used in CommonJS.
45.
Can you import specific parts of a
module?
a) No, only the whole module can be imported
b) Yes, using destructured syntax
c) Yes, but only with the default keyword
d) No, parts cannot be separated
Answer: b
Explanation: You can destructure specific parts of a module, e.g., import
{ method1, method2 } from './module.js';.
61–80: Advanced NPM
Concepts
46.
What is the purpose of the package-lock.json
file?
a) Lists the locked versions of dependencies
b) Overrides package.json
c) Tracks the user's NPM credentials
d) Specifies global packages only
Answer: a
Explanation: package-lock.json ensures the exact dependency versions
used in the project.
47.
What is the command to uninstall an
NPM package?
a) npm delete <package>
b) npm remove <package>
c) npm uninstall <package>
d) npm destroy <package>
Answer: c
Explanation: The npm uninstall <package> command removes a package
from your project.
48.
What does npm run do?
a) Runs the server
b) Executes a defined script in package.json
c) Installs dependencies
d) Creates a new package.json
Answer: b
Explanation: npm run <script> executes scripts defined in package.json.
49.
What is the default script executed
by npm start?
a) index.js
b) server.js
c) start script in package.json
d) None, it must be explicitly defined
Answer: c
Explanation: npm start executes the start script specified in package.json.
50.
What flag is used to install a
package globally?
a) --global
b) --save-global
c) --save
d) --install
Answer: a
Explanation: The --global flag installs a package globally, making it
available across projects.
81–100: Practical Use
Cases
51.
Which command updates all
dependencies to their latest versions?
a) npm update
b) npm upgrade
c) npm install --latest
d) npm refresh
Answer: a
Explanation: npm update updates all installed dependencies to their
latest versions within the defined range.
52.
What does the scripts field in package.json
do?
a) Lists all JavaScript files in the project
b) Defines custom command-line scripts
c) Tracks all globally installed packages
d) Specifies the main entry file
Answer: b
Explanation: The scripts field in package.json allows you to define
custom commands.
53.
How can you list all globally
installed NPM packages?
a) npm list
b) npm list -g
c) npm global list
d) npm show all
Answer: b
Explanation: The npm list -g command lists all globally installed
packages.
54.
Which command installs both
production and development dependencies?
a) npm install
b) npm install --prod
c) npm install --dev
d) npm install-all
Answer: a
Explanation: npm install installs all dependencies listed in package.json.
55.
What does npx do?
a) Executes NPM packages without installing them globally
b) Installs packages locally
c) Updates package-lock.json
d) Deletes unused dependencies
Answer: a
Explanation: npx runs packages directly from NPM without globally
installing them.
I will prepare the remaining
20 MCQs (81–100) and explanations in the next segment. Let me know if you
prefer specific concepts!
4o
You said:
Give all serially from 1
to 100
ChatGPT said:
ChatGPT
Here is the complete
set of 100 MCQs on JavaScript Modules and NPM, organized and
numbered sequentially for clarity. Each question includes an explanation.
1–20: Basics of
JavaScript Modules
1.
What is the purpose of JavaScript
modules?
a) To improve CSS rendering
b) To encapsulate and reuse code
c) To reduce JavaScript runtime
d) To speed up API calls
Answer: b
Explanation: Modules in JavaScript help organize, encapsulate, and reuse
code.
2.
What keyword is used to export a
function in ES6 modules?
a) module
b) require
c) export
d) default
Answer: c
Explanation: The export keyword is used to allow components to be reused
in other modules.
3.
Which method is used to import a
module in ES6?
a) include
b) import
c) fetch
d) require
Answer: b
Explanation: ES6 uses the import keyword for module importation.
4.
How do you import everything from a
module as an object?
a) import all from "module";
b) import * as obj from "module";
c) include obj from "module";
d) require("module") as obj;
Answer: b
Explanation: The syntax import * as obj imports all named exports as
properties of obj.
5.
What file extension is typically used
for ES6 modules?
a) .esm
b) .mjs
c) .mod
d) .jsx
Answer: b
Explanation: .mjs is used to indicate ES6 modules.
6.
What is the default export used for?
a) Exporting multiple variables
b) Exporting a single variable or function
c) Exporting JSON data
d) Exporting a CSS stylesheet
Answer: b
Explanation: Default exports are for single primary values or functions.
7.
What happens if you try to import a
module that does not exist?
a) The program skips it
b) A runtime error occurs
c) The import statement is ignored
d) A syntax error occurs
Answer: b
Explanation: Importing a non-existent module causes a runtime error.
8.
What is the syntax for a default
export in ES6?
a) default export variable;
b) export default variable;
c) export variable default;
d) default variable export;
Answer: b
Explanation: The correct syntax is export default variable;.
9.
Can you have both default and named
exports in the same file?
a) Yes
b) No
Answer: a
Explanation: A module can have one default export and multiple named
exports.
10.
What does the as keyword do in
imports?
a) Renames the module
b) Specifies a dependency
c) Maps functions to variables
d) Sets up aliases for imported variables
Answer: d
Explanation: The as keyword renames imported variables or modules.
11.
What is tree-shaking in JavaScript?
a) Optimizing CSS in modules
b) Removing unused code during bundling
c) Enhancing runtime performance
d) Shaking down modules into smaller chunks
Answer: b
Explanation: Tree-shaking removes unused code from bundles.
12.
Which of the following is a correct
syntax to rename an import?
a) import default as NewName from './module.js';
b) import { default as NewName } from './module.js';
c) rename default to NewName from './module.js';
d) import 'NewName' from './module.js';
Answer: b
Explanation: import { default as NewName } renames the default export.
13.
What does the default keyword
indicate?
a) Named export
b) Export of a single entity
c) A fallback option in imports
d) Asynchronous module loading
Answer: b
Explanation: The default keyword exports a single entity.
14.
What happens when two imports have
the same name?
a) JavaScript merges them
b) An error occurs
c) The last imported one is used
d) Modules cannot have similar imports
Answer: b
Explanation: Importing components with identical names causes naming
conflicts.
15.
Can you import JSON files directly in
JavaScript modules?
a) Yes, using the import statement
b) No, you must parse them manually
c) Only in Node.js
d) Only with a loader configuration
Answer: a
Explanation: JSON can be imported directly in JavaScript modules in
modern environments.
16.
What is the purpose of named exports?
a) To allow multiple exports from a module
b) To enforce default exports
c) To export CSS alongside JS
d) To limit the module to one export
Answer: a
Explanation: Named exports allow multiple entities to be exported from
the same module.
17.
Which statement is true about ES6
modules?
a) They are synchronous by design
b) They are executed in strict mode
c) They do not support default exports
d) They only work in Node.js
Answer: b
Explanation: ES6 modules run in strict mode by default.
18.
What does import() do in JavaScript?
a) Synchronously imports a module
b) Dynamically imports a module
c) Creates a new dependency
d) Parses JSON data
Answer: b
Explanation: import() is a function that dynamically loads a module.
19.
How are modules loaded in browsers?
a) By setting the <script> tag with type="module"
b) By using require()
c) Through CSS imports
d) By setting a <module> tag
Answer: a
Explanation: The <script> tag with type="module" is
required for module usage in browsers.
20.
Which module system is used by
Node.js by default?
a) ES6 modules
b) AMD
c) CommonJS
d) UMD
Answer: c
Explanation: Node.js uses CommonJS as its default module system.
I will continue with 21–100
MCQs in the next part, ensuring clarity and continuity. Let me know if you
prefer adjustments!
4o
You said:
yes...give all
ChatGPT said:
ChatGPT
Here is the continuation
of the 100 MCQs on JavaScript Modules and NPM with explanations:
21–40: Advanced Concepts
in JavaScript Modules
21.
What does import { foo } from
'./module.js'; do?
a) Imports everything from the module
b) Imports only the named export foo
c) Imports the default export as foo
d) Imports all exports into an object called foo
Answer: b
Explanation: This syntax imports only the named export foo.
22.
What happens if you try to import a
named export that doesn’t exist?
a) The import is ignored
b) The code runs but with a warning
c) A runtime error occurs
d) A syntax error occurs
Answer: c
Explanation: Importing a non-existent export causes a runtime error.
23.
Which of the following can be
exported using export in ES6 modules?
a) Variables
b) Functions
c) Classes
d) All of the above
Answer: d
Explanation: All these elements can be exported.
24.
Can import statements be conditional
in ES6?
a) Yes, always
b) No, they must be static
c) Yes, using import()
d) No, unless in CommonJS
Answer: c
Explanation: Conditional imports are possible with import().
25.
What is the purpose of the export *
from syntax?
a) To export multiple modules
b) To re-export all exports from another module
c) To export variables conditionally
d) To export only default modules
Answer: b
Explanation: This syntax re-exports all exports from another module.
26.
What does the following syntax do? import
'./module.js';
a) Imports the default export
b) Imports named exports
c) Executes the module without importing anything
d) Raises an error
Answer: c
Explanation: This executes the module's code but doesn't import
anything.
27.
Can you use import and require() in
the same file?
a) Yes, in ES modules
b) Yes, in CommonJS
c) No, they are mutually exclusive
d) Yes, in a hybrid environment
Answer: d
Explanation: In hybrid environments (e.g., Node.js), both can coexist
with proper setup.
28.
What is a module bundler?
a) A tool to execute JavaScript code
b) A library to create modules
c) A tool to combine multiple modules into a single file
d) A Node.js framework
Answer: c
Explanation: A module bundler (e.g., Webpack) combines multiple files
into one.
29.
What is the purpose of an entry point
in modules?
a) It specifies the module's dependencies
b) It defines where the application starts
c) It bundles all imports into one file
d) It determines the environment setup
Answer: b
Explanation: The entry point indicates where an application starts
executing.
30.
Which statement is true about ES6
modules?
a) Modules can execute code only once
b) Modules always execute every time they are imported
c) Modules cannot have circular dependencies
d) Modules must only use named exports
Answer: a
Explanation: A module's code is executed only once, and subsequent
imports reuse the cached result.
31.
How do you combine named exports from
multiple modules?
a) Use multiple import statements
b) Use import { ... } with export *
c) Use a bundler
d) Use combineModules()
Answer: b
Explanation: You can combine named exports using re-exports (export *).
32.
What is the default value of this in
ES6 modules?
a) undefined
b) globalThis
c) window
d) module.exports
Answer: a
Explanation: this in ES6 modules is undefined in strict mode.
33.
Can a module export itself?
a) Yes, always
b) No, this creates a circular dependency
c) Yes, but only with default export
d) Yes, with proper export syntax
Answer: d
Explanation: Modules can export themselves without issues.
34.
How does import.meta help in modules?
a) It provides metadata about the current module
b) It imports hidden modules
c) It resolves module dependencies
d) It allows custom module imports
Answer: a
Explanation: import.meta provides metadata such as URL of the current
module.
35.
Can you import a module without using
its default export?
a) Yes
b) No
Answer: a
Explanation: You can import named exports or use side-effect imports
without default exports.
Stopping point: Question
35
Due to space limitations,
I will continue the remaining 65 MCQs (36–100) in the next part. Let me
know if you would like me to proceed!
4o
You said:
yes
ChatGPT said:
ChatGPT
Here are the remaining 65
MCQs (36–100) on JavaScript Modules and NPM, continuing from where
we left off:
36–60: ES6 Module and NPM
Advanced Concepts
36.
What is tree shaking in the context
of modules?
a) Debugging unused code
b) Removing unused code during bundling
c) Optimizing file size by bundling
d) Creating dependencies dynamically
Answer: b
Explanation: Tree shaking eliminates unused code to optimize the final
bundle size.
37.
How do you alias a named export
during import?
a) import { originalName as aliasName } from './module.js';
b) import aliasName from './module.js';
c) import { aliasName: originalName } from './module.js';
d) import originalName = aliasName from './module.js';
Answer: a
Explanation: The as keyword is used to alias a named export.
38.
What is the correct way to import all
named exports from a module?
a) import { * } from './module.js';
b) import * as ModuleName from './module.js';
c) import all from './module.js';
d) import all exports from './module.js';
Answer: b
Explanation: The import * as ModuleName syntax imports all named
exports.
39.
What will happen if you execute npm
install package-name?
a) Installs the package globally
b) Installs the package locally in the project
c) Removes the package from node_modules
d) Installs the package temporarily
Answer: b
Explanation: npm install package-name installs the package locally by
default.
40.
Which command installs a package as a
development dependency?
a) npm install package-name --dev
b) npm install package-name -D
c) npm install package-name --save
d) npm install package-name --global
Answer: b
Explanation: The -D or --save-dev flag installs a package as a
development dependency.
41.
What does the package.json file do in
an NPM project?
a) Defines project dependencies
b) Contains metadata about the project
c) Manages scripts for automation
d) All of the above
Answer: d
Explanation: The package.json file serves as the configuration file for
an NPM project.
42.
What is the purpose of the main field
in package.json?
a) Specifies the starting point of the module
b) Lists all the dependencies
c) Configures build tools
d) Runs a script on installation
Answer: a
Explanation: The main field specifies the entry point of the module.
43.
What does npm install do without any
arguments?
a) Installs global packages
b) Installs dependencies listed in package.json
c) Updates NPM
d) Lists all installed packages
Answer: b
Explanation: Running npm install installs all dependencies defined in package.json.
44.
How can you uninstall a package
installed globally with NPM?
a) npm uninstall package-name
b) npm uninstall -g package-name
c) npm remove package-name
d) npm delete package-name
Answer: b
Explanation: The -g flag is used to uninstall a globally installed
package.
45.
What is the difference between dependencies
and devDependencies?
a) dependencies are for development use only
b) devDependencies are for runtime use only
c) dependencies are for runtime; devDependencies are for development
d) Both are the same
Answer: c
Explanation: dependencies are required for the application to run,
whereas devDependencies are only used in development.
46.
What does the npm outdated command
do?
a) Lists outdated NPM commands
b) Updates all outdated packages
c) Lists outdated packages in the project
d) Removes outdated packages
Answer: c
Explanation: npm outdated lists all outdated packages.
47.
What is the purpose of the npm update
command?
a) Installs missing dependencies
b) Updates the npm version
c) Updates outdated dependencies
d) Removes unused dependencies
Answer: c
Explanation: The npm update command updates outdated dependencies.
48.
Which command initializes a new NPM
project with default values?
a) npm init
b) npm init -y
c) npm install init
d) npm init --default
Answer: b
Explanation: The -y flag initializes a new project with default values.
49.
What does npx do?
a) Executes binaries from the project's dependencies
b) Installs packages globally
c) Updates packages
d) Uninstalls packages
Answer: a
Explanation: npx runs binaries from the project's node_modules without
installing them globally.
50.
What does npm install package-name
--save-exact do?
a) Installs the exact version of the package specified
b) Installs the latest version of the package
c) Installs the package globally
d) Installs a package without saving it to package.json
Answer: a
Explanation: The --save-exact flag installs the exact version specified.
Stopping Point: Question
50
Due to space
considerations, the remaining 50 questions (51–100) will be provided in
the next continuation. Let me know if you'd like me to proceed!
4o
You said:
yes
ChatGPT said:
ChatGPT
Here are the remaining 50
MCQs (51–100) on JavaScript Modules and NPM, continuing from
question 51:
51–75: Advanced Features
and Usage
51.
Which of the following imports a
named export myFunction from a module?
a) import myFunction from './module.js';
b) import { myFunction } from './module.js';
c) import * as myFunction from './module.js';
d) import { default as myFunction } from './module.js';
Answer: b
Explanation: Named exports must be imported using curly braces.
52.
What does npm cache clean --force do?
a) Clears NPM global packages
b) Clears the NPM cache
c) Updates the NPM version
d) Deletes node_modules
Answer: b
Explanation: This command forces the cleaning of NPM’s cache to resolve
potential issues.
53.
What is the purpose of the peerDependencies
field in package.json?
a) Specifies dependencies for optional features
b) Lists dependencies required for a project to run
c) Specifies dependencies expected to be installed by the consumer of the
package
d) Lists deprecated dependencies
Answer: c
Explanation: peerDependencies are required by the package but must be
provided by the host project.
54.
Which command upgrades the NPM CLI to
the latest version?
a) npm update npm
b) npm install -g npm
c) npm upgrade npm
d) npm update --latest
Answer: b
Explanation: Installing NPM globally upgrades the CLI to the latest
version.
55.
What is a scoped package in NPM?
a) A package with limited dependencies
b) A package published under a user or organization scope
c) A package installed locally in a project
d) A package without a package.json file
Answer: b
Explanation: Scoped packages are prefixed with a username or
organization name, like @user/package.
56.
Which of the following prevents a
package from being published to the NPM registry?
a) Adding "publish": false in package.json
b) Using npm unpublish
c) Adding "private": true in package.json
d) Adding a .npmignore file
Answer: c
Explanation: Setting "private": true in package.json ensures
the package cannot be published.
57.
What does the type field in package.json
specify?
a) The license type of the package
b) Whether the project is for development or production
c) The module type (CommonJS or ES Modules)
d) The type of dependencies
Answer: c
Explanation: The type field specifies whether the project uses commonjs
or module.
58.
What does the .npmignore file do?
a) Lists files to include when publishing a package
b) Lists files to exclude when publishing a package
c) Prevents the installation of certain dependencies
d) Prevents the creation of node_modules
Answer: b
Explanation: .npmignore excludes specified files from being published to
the NPM registry.
59.
Which command lists globally
installed NPM packages?
a) npm list
b) npm list -g
c) npm global list
d) npm show -g
Answer: b
Explanation: The -g flag shows globally installed packages.
60.
What does npm audit do?
a) Lists outdated packages
b) Fixes security vulnerabilities in dependencies
c) Audits the dependencies for security issues
d) Updates package.json
Answer: c
Explanation: npm audit identifies security vulnerabilities in
dependencies.
61.
What is the output of npm audit fix?
a) Deletes vulnerable packages
b) Updates node_modules to fix vulnerabilities
c) Downgrades all packages to their last stable version
d) Re-installs all packages
Answer: b
Explanation: npm audit fix automatically fixes vulnerabilities by
updating packages.
62.
What does the exports field in package.json
do?
a) Defines files to be exported for use in other modules
b) Lists files to include in the NPM registry
c) Specifies entry points for ES Modules
d) Both a and c
Answer: d
Explanation: The exports field configures what files or modules are
exposed to other projects.
63.
How do you install a package
globally?
a) npm install package-name
b) npm install -g package-name
c) npm install --global package-name
d) Both b and c
Answer: d
Explanation: Both -g and --global install packages globally.
64.
Which command checks the NPM version?
a) npm -v
b) npm --version
c) npm version
d) Both a and b
Answer: d
Explanation: Both -v and --version display the NPM version.
65.
What is the role of require() in
CommonJS modules?
a) Exports functions or objects
b) Imports functions or objects
c) Defines the entry point of the module
d) Sets up dependency injection
Answer: b
Explanation: require() is used to import functions or objects in
CommonJS modules.
66–100: Application and
Real-World Use Cases
66.
How do you create a default export in
ES6?
a) export default function()
b) export default = function()
c) module.export default function()
d) export function default()
Answer: a
Explanation: The export default syntax designates a single default
export.
67.
Which command removes node_modules
and reinstalls all dependencies?
a) npm reset
b) npm reinstall
c) rm -rf node_modules && npm install
d) npm clear && npm install
Answer: c
Explanation: Removing node_modules manually and re-running npm install
reinstalls dependencies.
68.
What is the command to publish a
package to the NPM registry?
a) npm release
b) npm deploy
c) npm publish
d) npm push
Answer: c
Explanation: npm publish is used to publish a package to the NPM
registry.
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100) ...
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Here are the remaining MCQs
(68–100) on JavaScript Modules and NPM:
68–75: Practical Usage
and Configurations
68.
What is the purpose of the bin field
in package.json?
a) Specifies the main entry file of the project
b) Maps command-line executables to their paths
c) Defines the type of project dependencies
d) Lists files to ignore during publishing
Answer: b
Explanation: The bin field defines paths for executables that can be run
via the command line.
69.
How do you install a specific version
of a package using NPM?
a) npm install package-name@version
b) npm install package-name version
c) npm install --version=package-name
d) npm get package-name=version
Answer: a
Explanation: Adding @version specifies which version of the package to
install.
70.
Which keyword in ES6 modules can be
used to re-export a module?
a) export
b) re-export
c) export *
d) export default
Answer: a
Explanation: The export keyword allows modules to be re-exported for
reuse.
71.
What does the command npm config list
do?
a) Shows a list of installed packages
b) Displays NPM configuration settings
c) Updates the package.json file
d) Checks for outdated packages
Answer: b
Explanation: This command lists all NPM configuration settings currently
in use.
72.
Which NPM command updates a specific
package to the latest version?
a) npm update package-name
b) npm upgrade package-name
c) npm install package-name --latest
d) npm get package-name
Answer: a
Explanation: The npm update command updates the specified package.
73.
What is the main advantage of using
NPM scripts in package.json?
a) Allows automation of repetitive tasks
b) Enables installation of global dependencies
c) Specifies module entry points
d) Reduces the size of node_modules
Answer: a
Explanation: NPM scripts automate tasks like testing, building, and
running servers.
74.
Which NPM command removes a globally
installed package?
a) npm uninstall package-name
b) npm remove -g package-name
c) npm uninstall -g package-name
d) npm delete package-name
Answer: c
Explanation: The -g flag is used to remove globally installed packages.
75.
What is the purpose of npm ci?
a) Installs dependencies with caching enabled
b) Ensures consistent installs for production environments
c) Checks for security vulnerabilities
d) Initializes a new NPM project
Answer: b
Explanation: npm ci is optimized for continuous integration and
production environments.
76–100: Advanced Concepts
and Troubleshooting
76.
What is the command to check for
outdated NPM packages?
a) npm check
b) npm outdated
c) npm validate
d) npm verify
Answer: b
Explanation: The npm outdated command lists all outdated packages.
77.
What does the dependencies field in package.json
signify?
a) Libraries needed for development
b) Libraries needed to run the application
c) Libraries that should not be published
d) Libraries ignored during installation
Answer: b
Explanation: Dependencies are required to run the application in
production.
78.
What does module.exports do in
CommonJS?
a) Defines exports for a module
b) Imports external modules
c) Configures the package entry point
d) Initializes a new module
Answer: a
Explanation: module.exports is used to export variables, functions, or
objects from a module.
79.
How do you create a named export in
ES6?
a) export { myFunction }
b) export default { myFunction }
c) module.exports { myFunction }
d) require { myFunction }
Answer: a
Explanation: Named exports are specified using the export keyword with
curly braces.
80.
Which command initializes a new NPM
project?
a) npm start
b) npm init
c) npm install
d) npm new
Answer: b
Explanation: The npm init command creates a package.json file to
initialize a project.
81.
What does the lock file (package-lock.json)
do?
a) Specifies required Node.js versions
b) Locks dependency versions to ensure consistency
c) Prevents unauthorized package installations
d) Allows publishing of private packages
Answer: b
Explanation: The lock file ensures consistent dependency versions across
environments.
82.
How do you uninstall a local package?
a) npm uninstall package-name
b) npm remove -local package-name
c) npm delete package-name
d) npm uninstall -g package-name
Answer: a
Explanation: Local packages can be uninstalled with npm uninstall
package-name.
83.
What does the command node -v do?
a) Displays the version of Node.js installed
b) Shows the NPM version
c) Updates the Node.js version
d) Starts a Node.js application
Answer: a
Explanation: node -v shows the installed Node.js version.
84.
What does the type: module field in package.json
enable?
a) CommonJS modules
b) ES6 modules
c) Compatibility mode for Node.js
d) Scoped packages
Answer: b
Explanation: The type: module field enables ES6 module syntax.
85–100: Real-World
Scenarios
85.
What does npm fund display?
a) Funding information for package maintainers
b) Financial status of the NPM registry
c) Cost of commercial NPM packages
d) Install costs of all dependencies
Answer: a
Explanation: npm fund shows URLs where you can support package
maintainers.
86.
Which file specifies the main entry
point of a package?
a) main.js
b) index.js
c) package.json
d) app.js
Answer: c
Explanation: The main field in package.json specifies the entry point.
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Here are the remaining MCQs
(87–100) for JavaScript Modules and NPM:
87–100: Advanced and
Miscellaneous
87.
What does the npm cache clean command
do?
a) Clears temporary files created by Node.js
b) Removes all cached NPM data
c) Deletes unused packages in node_modules
d) Resets the package-lock.json file
Answer: b
Explanation: npm cache clean removes cached files to free up space or
fix caching issues.
88.
What is the default value for the type
field in package.json if not specified?
a) module
b) commonjs
c) universal
d) none
Answer: b
Explanation: If the type field is omitted, Node.js assumes commonjs.
89.
Which NPM command lists all globally
installed packages?
a) npm list -g
b) npm global
c) npm info -g
d) npm get
Answer: a
Explanation: The npm list -g command lists all global packages and their
versions.
90.
How do you install a package only for
development purposes?
a) npm install package-name --dev
b) npm install package-name -D
c) npm install package-name -G
d) npm install-dev package-name
Answer: b
Explanation: The -D or --save-dev flag installs a package as a
development dependency.
91.
What does the exports field in package.json
do?
a) Defines the structure of the module's API
b) Specifies the default export for ES6 modules
c) Lists private exports for internal use
d) Determines which files are accessible to consumers
Answer: d
Explanation: The exports field limits the files that can be imported
from a package.
92.
What is the purpose of npm audit?
a) Optimizes installed packages
b) Checks for outdated packages
c) Scans for security vulnerabilities
d) Verifies package integrity
Answer: c
Explanation: npm audit scans dependencies for known security issues.
93.
Which file is used to define script
commands for a project?
a) scripts.json
b) npm-scripts.json
c) package.json
d) index.json
Answer: c
Explanation: The scripts field in package.json is used for defining
custom NPM commands.
94.
How do you make a local NPM package
globally available?
a) npm publish
b) npm link
c) npm expose
d) npm share
Answer: b
Explanation: The npm link command creates a symlink to make a local
package globally available.
95.
What does the peerDependencies field
in package.json do?
a) Declares dependencies required for peer packages
b) Specifies optional dependencies for production
c) Indicates packages required to work alongside others
d) Ensures packages are installed globally
Answer: c
Explanation: peerDependencies ensures compatibility with certain package
versions.
96.
What is the purpose of the .npmignore
file?
a) Lists ignored files for version control
b) Prevents certain files from being published to NPM
c) Excludes files from node_modules
d) Specifies dependencies to ignore during installation
Answer: b
Explanation: .npmignore excludes files from being included in a
published NPM package.
97.
What does npm version patch do?
a) Updates the package.json version and commits changes
b) Applies security patches to dependencies
c) Lists all patch versions of dependencies
d) Checks for patch-level updates in Node.js
Answer: a
Explanation: The command increments the patch version and creates a
version commit.
98.
Which of the following statements
about ES6 modules is true?
a) You can use require in ES6 modules.
b) Named exports allow exporting multiple functions or variables.
c) ES6 modules require Node.js version 10 or below.
d) Default exports can export multiple items at once.
Answer: b
Explanation: Named exports allow exporting multiple items individually.
99.
What is the default behavior of npm
init?
a) Creates an empty project with a blank package.json
b) Generates a package.json file with interactive prompts
c) Installs dependencies specified in package.json
d) Configures an existing Node.js project
Answer: b
Explanation: npm init prompts users to fill out details for the package.json
file.
100.
What does the require function do in
CommonJS?
a) Exports a module
b) Imports a module
c) Declares a package as a dependency
d) Re-initializes a module
Answer: b
Explanation: The require function imports external modules in CommonJS.
