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Software Development Exam  >  Software Development Test  >  JavaScript for Web Development  >  Test: Functions - 1 - Software Development MCQ

Functions - 1 - Free MCQ Practice Test with solutions, Software Development


MCQ Practice Test & Solutions: Test: Functions - 1 (15 Questions)

You can prepare effectively for Software Development JavaScript for Web Development with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Functions - 1". These 15 questions have been designed by the experts with the latest curriculum of Software Development 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 30 minutes
  • - Number of Questions: 15

Sign up on EduRev for free to attempt this test and track your preparation progress.

Test: Functions - 1 - Question 1
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Which of the following statements is true about JavaScript functions?

Detailed Solution: Question 1

A function in JavaScript is a set of statements that performs a specific task.

Test: Functions - 1 - Question 2
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What is the purpose of using parameters in JavaScript functions?

Detailed Solution: Question 2

Parameters allow us to pass values into a function for its operation.

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Test: Functions - 1 - Question 3
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Which of the following options correctly represents the syntax to define a function in JavaScript?

Detailed Solution: Question 3

The correct syntax to define a function in JavaScript is "function myFunction() {}".

Test: Functions - 1 - Question 4
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What does the term "function expression" mean in JavaScript?

Detailed Solution: Question 4

A function expression is a way to define a function as a value of a variable.

Test: Functions - 1 - Question 5
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What is the difference between function declarations and function expressions in JavaScript?

Detailed Solution: Question 5

Function declarations are hoisted, while function expressions are not.

Test: Functions - 1 - Question 6
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What will be the output of the following JavaScript code?
function greet() {
  console.log("Hello, World!");
}

greet();

Detailed Solution: Question 6

The code defines a function named "greet" that logs "Hello, World!" to the console. Calling "greet()" executes the function, resulting in the output "Hello, World!".

Test: Functions - 1 - Question 7
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What will be the output of the following JavaScript code?
function sum(a, b) {
  return a + b;
}

var result = sum(3, 4);
console.log(result);

Detailed Solution: Question 7

The code defines a function named "sum" that takes two parameters and returns their sum. Calling "sum(3, 4)" passes the values 3 and 4 to the function, which returns the sum of 7. The result is then logged to the console.

Test: Functions - 1 - Question 8
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What will be the output of the following JavaScript code?
var multiply = function(a, b) {
  return a * b;
};

console.log(multiply(2, 5));

Detailed Solution: Question 8

The code defines a function expression named "multiply" that takes two parameters and returns their product. Calling "multiply(2, 5)" passes the values 2 and 5 to the function, which returns the product of 10. The result is then logged to the console.

Test: Functions - 1 - Question 9
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What will be the output of the following JavaScript code?
var x = 5;

function updateX() {
  var x = 10;
}

updateX();
console.log(x);

Detailed Solution: Question 9

The code declares a global variable "x" with the value 5. The function "updateX" declares a local variable "x" with the value 10 but does not modify the global variable. Calling "updateX()" has no effect on the value of the global "x". Therefore, the output is 5.

Test: Functions - 1 - Question 10
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What will be the output of the following JavaScript code?
var x = 5;

function updateX() {
  x = 10;
}

updateX();
console.log(x);

Detailed Solution: Question 10

The code declares a global variable "x" with the value 5. The function "updateX" modifies the global variable "x" by assigning it the value 10. Calling "updateX()" updates the value of the global "x". Therefore, the output is 10.

Test: Functions - 1 - Question 11
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Consider the following JavaScript code:
var calculate = function(a, b, operation) {
  return operation(a, b);
};

function add(a, b) {
  return a + b;
}

var result = calculate(3, 4, add);
console.log(result);
What will be the output of the above code?

Detailed Solution: Question 11

The code defines a function expression named "calculate" that takes three parameters: "a", "b", and "operation". The "operation" parameter is expected to be a function. In this case, the "add" function is passed as an argument to "calculate". The "calculate" function then calls the "operation" function with the values of "a" and "b". So, "calculate(3, 4, add)" is equivalent to "add(3, 4)", which returns the sum of 7. The result is then logged to the console.

Test: Functions - 1 - Question 12
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Consider the following JavaScript code:
function outer() {
  var x = 10;

  function inner() {
    console.log(x);
  }

  return inner;
}

var closureFn = outer();
closureFn();
What will be the output of the above code?

Detailed Solution: Question 12

The code defines a function named "outer" that declares a variable "x" with the value 10. Inside "outer", there is a nested function named "inner" that logs the value of "x" to the console. Finally, the "inner" function is returned from "outer" and assigned to the variable "closureFn". Calling "closureFn()" executes the "inner" function, which accesses the value of "x" from its outer scope. Therefore, the output is 10.

Test: Functions - 1 - Question 13
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Consider the following JavaScript code:
function multiplyBy(factor) {
  return function(number) {
    return number * factor;
  };
}

var multiplyByTwo = multiplyBy(2);
var multiplyByFive = multiplyBy(5);

console.log(multiplyByTwo(3));
console.log(multiplyByFive(4));
What will be the output of the above code?

Detailed Solution: Question 13

The code defines a function named "multiplyBy" that takes a parameter "factor" and returns an inner function. The inner function takes a parameter "number" and multiplies it by the "factor" value captured in its closure. By calling "multiplyBy(2)", we create a closure that multiplies any number by 2. Similarly, calling "multiplyBy(5)" creates a closure that multiplies any number by 5. Therefore, "multiplyByTwo(3)" returns 6, and "multiplyByFive(4)" returns 20.

Test: Functions - 1 - Question 14
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Consider the following JavaScript code:
function outer() {
  var x = 10;

  function inner() {
    console.log(x);
    var x = 20;
  }

  inner();
}

outer();
What will be the output of the above code?

Detailed Solution: Question 14

The code defines a function named "outer" that declares a variable "x" with the value 10. Inside "outer", there is a nested function named "inner" that logs the value of "x" to the console. However, before the console log, there is a variable declaration "var x = 20". This declaration creates a new local variable "x" within the "inner" function's scope. Since JavaScript has function-level scope, the declaration of the local "x" variable shadows the outer "x" variable. Therefore, when the console log is executed, the value of the local "x" variable, which is undefined, is logged.

Test: Functions - 1 - Question 15
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Consider the following JavaScript code:
var x = 5;

function updateX() {
  x = 10;
}

setTimeout(updateX, 1000);

console.log(x);
What will be the output of the above code?

Detailed Solution: Question 15

The code declares a global variable "x" with the value 5. The function "updateX" modifies the global variable "x" by assigning it the value 10. However, the function "updateX" is called asynchronously using "setTimeout" with a delay of 1000 milliseconds. Therefore, the console log is executed before the "updateX" function has a chance to modify the value of "x". Hence, the output is 5.

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About this Software Development Practice Test

This test contains 15 MCQs on Functions - 1 with detailed solutions for each question. It is part of the JavaScript for Web Development course on EduRev, designed to align with the current Software Development syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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