R4RIN – MCQs, Mock Tests | JavaScript JavaScript MCQ Set 2

An expression that can legally appear on the left side of an assignment expression.” is a well known explanation for variables, properties of objects, and elements of arrays. They are called ___________

1. Properties
2. Prototypes
3. Lvalue
4. Definition

✅ Correct Answer: 3

What will be the equivalent output of the following JavaScript code snippet? x = ~-y; w = x = y = z; q = a?b:c?d:e?f:g;

1. x = ~(-y); w = (x = (y = z)); q = a?b:(c?d:(e?f:g));
2. x = a?b:(c?d:(e?f:g)); q = ~(-y); w = (x = (y = z));
3. x = (x = (y = z));w = ~(-y); q = a?b:(c?d:(e?f:g));
4. x = ~(-y); w = (x = (y = z)); q = (c?d:(e?f:g));

✅ Correct Answer: 3

What will be the output of the following JavaScript code? function output(option) { return (option ? “yes” : “no”); } bool ans=true; console.log(output(ans));

1. Yes
2. No
3. Runtime error
4. Compilation error

✅ Correct Answer: 1

What will be the output of the following JavaScript code? function height() { var height = 123.56; var type = (height>=190) ? "tall" : "short"; return type; }

1. 123.56
2. 190
3. tall
4. short

✅ Correct Answer: 4

What will be the output of the following JavaScript code? string a = ”hi”; string b =”there”; alert(a+b);

1. hi
2. there
3. hithere
4. undefined

✅ Correct Answer: 3

What will be the output of the following JavaScript code? function output(object) { var place=object ? object.place : “Italy”; return “clean:”+ place; } console.log(output({place:India}));

1. clean:India
2. clean:Italy
3. error
4. undefined

✅ Correct Answer: 1

What will be the output of the following JavaScript code? <p id="demo"></p> <script> function myFunction() { document.getElementById("demo").innerHTML = Math.abs(-7.25); } </script>

1. 7.25
2. -7.25
3. 7
4. -7

✅ Correct Answer: 1

What will be the output of the following JavaScript code? <p id="demo"></p> <script> function myFunction() { document.getElementById("demo").innerHTML = Math.cbrt(125); } </script>

1. 125
2. 25
3. 5
4. Error

✅ Correct Answer: 3

What will be the output of the following JavaScript code? <p id="demo"></p> <script> function myFunction() { document.getElementById("demo").innerHTML = Math.acos(0.5); } </script>

1. 1.01
2. 1.047
3. 1.00
4. 1.4

✅ Correct Answer: 2