Practice Questions For

ANS : (d) Both var and let can be used to declare variables in JavaScript.

ANS : (d) All of the above are valid data types in JavaScript.

ANS : (a) The correct way to create a function in JavaScript is function myFunction() {}.

ANS : (a) The output will be "object" because of a historical bug in JavaScript.

ANS : (a) The correct way to parse a JSON string in JavaScript is JSON.parse().

ANS : (c) Both {} and new Object() can be used to create an object in JavaScript.

ANS : (d) All of the above are popular JavaScript frameworks.

ANS : (b) The output will be false due to floating-point precision issues.

ANS : (a) The correct method to prevent the default action of an event is event.preventDefault();.

ANS : (b) The `this` keyword refers to the current object in the context of which it is used.

ANS : (d) All of the above methods can be used to convert a string to a number in JavaScript.

ANS : (b) The output will be "11" because of type coercion in JavaScript.

ANS : (c) Both {} and new Object() can be used to create an object in JavaScript.

ANS : (a) The setTimeout() function is used to delay the execution of a function.

ANS : (c) Both try-catch and throw are used to handle exceptions in JavaScript.

ANS : (b) The output will be "22" due to type coercion in JavaScript.

ANS : (c) Both new Array() and [] can be used to create an array in JavaScript.

ANS : (a) The output will be "number" because NaN is considered a number type in JavaScript.

ANS : (a) Curly braces {} are used to define a block of code in JavaScript.

ANS : (a) The `window.onload` event is used to execute code when the DOM is fully loaded.

ANS : (a) The = operator is used to assign values.

ANS : (a) // is used for single-line comments in JavaScript.

ANS : (c) The correct way is <script src="script.js">.

ANS : (c) A JavaScript function is created using the function keyword.

ANS : (d) All of the above keywords are used to declare variables.

ANS : (a) Math.round() is used to round numbers to the nearest integer.

ANS : (d) JavaScript supports Number, String, Boolean, and other types.

ANS : (b) You call a function by using its name followed by parentheses.

ANS : (b) The break statement exits a loop.

ANS : (a) push() adds elements to the end of an array.

ANS : (c) JavaScript uses if (condition) syntax.

ANS : (b) pop() removes the last element of an array.

ANS : (a) parseInt() converts strings to integers.

ANS : (c) There is no "loop" statement in JavaScript.

ANS : (c) Due to a bug in JavaScript, `typeof null` returns "object".

ANS : (b) JavaScript performs string concatenation when a number is added to a string.

ANS : (d) JavaScript supports single-line (//) and multi-line (/* */) comments.

ANS : (a) The = operator is used for assignment.

ANS : (c) `const` is used to declare constants in JavaScript.

ANS : (c) The correct way is <script src="xxx.js">

ANS : (b) `isNaN()` checks if the value is NaN (Not-a-Number).

ANS : (a) The `window` object is at the top of the scope chain in browsers.

ANS : (a) `console.log()` prints output to the browser console.

ANS : (b) Arrays in JavaScript are of type object.

ANS : (b) `onclick` is triggered when an element is clicked.

ANS : (b) `Boolean(0)` returns false.

ANS : (b) JSON.parse() is used to convert JSON strings into JavaScript objects.

ANS : (c) The `.length` property returns the number of characters in a string.

ANS : (c) === checks for both value and type equality.

ANS : (c) `addEventListener()` attaches an event handler to an element.

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