- AConditional block
- BBlock that combines a number of statements into a single compound statement
- CBoth conditional block and a single statement
- DBlock that contains a single statement
Basic JavaScript MCQ - Quiz
- AA URL that uses the special javascript:protocol
- BA URL that uses the special javascript:code
- CA URL that uses the special javascript:encoding
- DA URL that uses the special javascript:stack
- Acompilation error
- Bfalse
- Cruntime error
- Dtrue
- AgetElementbyId()
- BgetElementsByClassName()
- CBoth A & B
- DNone of the above
- Aobj.newProperty = 'value';
- Bobj.addProperty('newProperty', 'value');
- Cobj['newProperty'] = 'value';
- Dobj.set('newProperty', 'value');
- Anull
- B'null'
- C'object'
- Dundefined
- A25
- B'5'
- C'0'
- D'55'
- AJavaScript is a scripting language used to make the website interactive
- BJavaScript is an assembly language used to make the website interactive
- CJavaScript is a compiled language used to make the website interactive
- DNone of the mentioned
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Basic JavaScript MCQ - Quiz
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- A. Conditional block
- B. Block that combines a number of statements into a single compound statement
- C. Both conditional block and a single statement
- D. Block that contains a single statement
Remarks:
Explanation:
A block of statements is a group of zero or more statements that are treated as a single unit.
In JavaScript, a block of statements is defined using curly braces {}.
A block of statement can be understand as the set of the zero or more statements.
In general, a block of statement has common definition "which combines one or a number of statements into a single statement for ease.
- A. A URL that uses the special javascript:protocol
- B. A URL that uses the special javascript:code
- C. A URL that uses the special javascript:encoding
- D. A URL that uses the special javascript:stack
Remarks:
Explanation:
You can use the javascript: protocol in a URL to execute a JavaScript function.
This can be used, for example, to create a link that executes a JavaScript function when clicked.
- A. compilation error
- B. false
- C. runtime error
- D. true
Remarks:
Explanation:
If this code is run, the function will return true.
The == operator, also known as the abstract equality operator, compares two values for equality.
It converts the operands to the same type before making the comparison, so it can return true even if the operands have different types.
In this case, the variable x is of type int (integer) and the variable y is of type char (character).
However, the == operator will convert both variables to the same type (number) before making the comparison, so the comparison will evaluate to true.
If you wanted to perform a strict comparison that only returns true if the operands are equal and have the same type,
you could use the === operator instead.
- A. getElementbyId()
- B. getElementsByClassName()
- C. Both A & B
- D. None of the above
Remarks:
Explanation:
There are several ways to get a reference to an HTML element in JavaScript:
getElementById():
This method is used to get a reference to an element with a specific id.
For example:
let element = document.getElementById('my-element');
getElementsByClassName():
This method is used to get a list of elements with a specific class name.
For example:
let elements = document.getElementsByClassName('my-class');
- A. obj.newProperty = 'value';
- B. obj.addProperty('newProperty', 'value');
- C. obj['newProperty'] = 'value';
- D. obj.set('newProperty', 'value');
Remarks:
Explanation:
obj.newProperty = 'value'; is the correct way to add a new property to an object in JavaScript.
You can use the dot notation (obj.property) or the square bracket notation (obj['property']) to add a new property to an object.
- A. true
- B. false
- C. 10
- D. '10'
Remarks:
Explanation:
The result of the code is true.
The == operator in JavaScript performs type coercion, which means that it converts the operands to the same type before performing the comparison.
In this case, the string '10' is converted to the number 10, so the comparison returns true.
- A. null
- B. 'null'
- C. 'object'
- D. undefined
Remarks:
Explanation:
The result of the code is 'object'.
In JavaScript, the typeof operator returns a string that represents the type of a value.
However, the typeof operator has a few quirks,
one of which is that it returns 'object' for null values.
This is a known issue in JavaScript, and it can cause confusion for developers who are not aware
- A. &&
- B. ||
- C. !
- D. in
Remarks:
Explanation:
in is not a logical operator in JavaScript.
Logical operators in JavaScript include && (and), || (or), and ! (not). in is an operator that is used to check whether an object has a property with a given name.
- A. 25
- B. '5'
- C. '0'
- D. '55'
Remarks:
Explanation:
The result of the code is 25.
In JavaScript, the * operator performs multiplication if both operands are numbers.
In this case, the string '5' is coerced to the number 5, so the final result is 5 * 5 = 25
- A. JavaScript is a scripting language used to make the website interactive
- B. JavaScript is an assembly language used to make the website interactive
- C. JavaScript is a compiled language used to make the website interactive
- D. None of the mentioned
Remarks:
Explanation:
JavaScript is a
scripting language used along with HTML and CSS to make the website interactive along. It is used both on the client-side and server-side.