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Test: Variables and Operators - 1 - Software Development MCQ


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15 Questions MCQ Test - Test: Variables and Operators - 1

Test: Variables and Operators - 1 for Software Development 2024 is part of Software Development preparation. The Test: Variables and Operators - 1 questions and answers have been prepared according to the Software Development exam syllabus.The Test: Variables and Operators - 1 MCQs are made for Software Development 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Variables and Operators - 1 below.
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Test: Variables and Operators - 1 - Question 1

Which keyword is used to declare variables in JavaScript?

Detailed Solution for Test: Variables and Operators - 1 - Question 1

The "var" keyword is used to declare variables in JavaScript.

Test: Variables and Operators - 1 - Question 2

Which of the following is NOT a valid variable name in JavaScript?

Detailed Solution for Test: Variables and Operators - 1 - Question 2

Variable names in JavaScript cannot start with a number.

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Test: Variables and Operators - 1 - Question 3

What is the result of the following expression: "5" + 2?

Detailed Solution for Test: Variables and Operators - 1 - Question 3

When using the + operator with a string and a number, JavaScript performs string concatenation.

Test: Variables and Operators - 1 - Question 4

What is the value of x after executing the following code?

let x = 5;
x += 3;

Detailed Solution for Test: Variables and Operators - 1 - Question 4

The "+=" operator adds the right operand to the left operand and assigns the result to the left operand.

Test: Variables and Operators - 1 - Question 5

Which of the following is NOT a JavaScript number method?

Detailed Solution for Test: Variables and Operators - 1 - Question 5

"toUpperCase()" is a string method, not a number method.

Test: Variables and Operators - 1 - Question 6

What is the output of the following code?

let x = 10;
let y = "5";
console.log(x + y);

Detailed Solution for Test: Variables and Operators - 1 - Question 6

JavaScript performs string concatenation when adding a string and a number.

Test: Variables and Operators - 1 - Question 7

What will be printed to the console when executing the following code?
let x = 10;
let y = 5;
console.log("The sum is: " + (x + y));

Detailed Solution for Test: Variables and Operators - 1 - Question 7

The sum of x and y is calculated as 10 + 5, resulting in 15.

Test: Variables and Operators - 1 - Question 8

What is the output of the following code?
let x = 5;
let y = "2";
console.log(x - y);

Detailed Solution for Test: Variables and Operators - 1 - Question 8

JavaScript tries to perform a numeric subtraction but encounters a string, resulting in "NaN" (Not a Number).

Test: Variables and Operators - 1 - Question 9

What will be the value of result after executing the following code?
let x = 5;
let y = 2;
let result = x % y;

Detailed Solution for Test: Variables and Operators - 1 - Question 9

The modulus operator (%) returns the remainder of the division between x and y.

Test: Variables and Operators - 1 - Question 10

What will be printed to the console when executing the following code?
let x = 10;
let y = 3;
console.log(x / y);

Detailed Solution for Test: Variables and Operators - 1 - Question 10

JavaScript performs floating-point division when dividing a number by another number.

Test: Variables and Operators - 1 - Question 11

What is the value of x after executing the following code?
let x = 5;
x++;
x += 2;

Detailed Solution for Test: Variables and Operators - 1 - Question 11

The code first increments x by 1 (5 + 1 = 6) and then adds 2 to the updated value (6 + 2 = 8).

Test: Variables and Operators - 1 - Question 12

What will be the value of result after executing the following code?
let x = 10;
let y = 3;
let result = Math.pow(x, y);

Detailed Solution for Test: Variables and Operators - 1 - Question 12

The "Math.pow()" function calculates the power of x raised to y.

Test: Variables and Operators - 1 - Question 13

What is the value of x after executing the following code?
let x = 5;
x *= 3 - 1;

Detailed Solution for Test: Variables and Operators - 1 - Question 13

The expression 3 - 1 evaluates to 2, and then x is multiplied by 2.

Test: Variables and Operators - 1 - Question 14

What will be printed to the console when executing the following code?
let x = 5;
let y = 2;
console.log(x % y);

Detailed Solution for Test: Variables and Operators - 1 - Question 14

The modulus operator (%) returns the remainder of the division between x and y.

Test: Variables and Operators - 1 - Question 15

What is the output of the following code?
let x = "Hello";
let y = "World";
console.log(x + " " + y);

Detailed Solution for Test: Variables and Operators - 1 - Question 15

The code concatenates the strings "Hello" and "World" with a space in between.

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