Javascript Mock Test

Yes! JavaScript is a case-sensitive language. This means that language keywords, variables, function names, and any other identifiers must always be typed with a consistent capitalization of letters.

Q 7 - Which of the following is true about variable naming conventions in JavaScript?

A - You should not use any of the JavaScript reserved keyword as variable name.

B - JavaScript variable names should not start with a numeral (0-9).

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 8 - Which of the following is true about variable naming conventions in JavaScript?

A - JavaScript variable names must begin with a letter or the underscore character.

B - JavaScript variable names are case sensitive.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 9 - Which of the following is true about typeof operator in JavaScript?

A - The typeof is a unary operator that is placed before its single operand, which can be of any type.

B - Its value is a string indicating the data type of the operand.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 10 - Can you access Cookie using javascript?

A - true

B - false

Answer : A

Explanation

Yes! JavaScript can also manipulate cookies using the cookie property of the Document object.

Q 11 - Which of the following is true about cookie handling in JavaScript?

A - JavaScript can manipulate cookies using the cookie property of the Document object.

B - JavaScript can read, create, modify, and delete the cookie or cookies that apply to the current web page.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 12 - Which of the following is the correct syntax to create a cookie using JavaScript?

A - document.cookie = 'key1 = value1; key2 = value2; expires = date';

B - browser.cookie = 'key1 = value1; key2 = value2; expires = date';

C - window.cookie = 'key1 = value1; key2 = value2; expires = date';

D - navigator.cookie = 'key1 = value1; key2 = value2; expires = date';

Answer : A

Explanation

document.cookie = 'key1 = value1; key2 = value2; expires = date'; is the correct option.

Q 13 - Which of the following is the correct syntax to redirect a url using JavaScript?

A - document.location='https://www.newlocation.com';

B - browser.location='https://www.newlocation.com';

C - navigator.location='https://www.newlocation.com';

D - window.location='https://www.newlocation.com';

Answer : D

Explanation

window.location='https://www.newlocation.com'; is the correct option.

Q 14 - Which of the following is the correct syntax to print a page using JavaScript?

A - window.print();

B - browser.print();

C - navigator.print();

D - document.print();

Answer : A

Explanation

window.print(); is the correct option.

Q 15 - Which of the following is a valid type of function javascript supports?

A - named function

B - anonymous function

C - Both of the above.

D - None of the above.

Answer : C

Explanation

A function in JavaScript can be either named or anonymous.

Q 16 - Can you assign a anonymous function to a variable?

A - true

B - false

Answer : A

Explanation

Yes! An anonymous function can be assigned to a variable.

Q 17 - Can you pass a anonymous function as an argument to another function?

A - true

B - false

Answer : A

Explanation

Yes! An anonymous function can be passed as an argument to another function.

Q 18 - How can you get the type of arguments passed to a function?

A - using typeof operator

B - using getType function

C - Both of the above.

D - None of the above.

Answer : A

Explanation

Using typeof operator, we can get the type of arguments passed to a function.

Q 19 - How can you get the total number of arguments passed to a function?

A - Using args.length property

B - Using arguments.length property

C - Both of the above.

D - None of the above.

Answer : B

Explanation

Using arguments.length property, we can get the total number of arguments passed to a function.

Q 20 - Which of the following type of variable is visible everywhere in your JavaScript code?

A - global variable

B - local variable

C - Both of the above.

D - None of the above.

Answer : A

Explanation

Global Variables: A global variable has global scope which means it is visible everywhere in your JavaScript code.

Q 21 - Which of the following type of variable is visible only within a function where it is defined?

A - global variable

B - local variable

C - Both of the above.

D - None of the above.

Answer : B

Explanation

Local Variables: A local variable will be visible only within a function where it is defined. Function parameters are always local to that function.

Q 22 - Which of the following type of variable takes precedence over other if names are same?

A - global variable

B - local variable

C - Both of the above.

D - None of the above.

Answer : B

Explanation

A local variable takes precedence over a global variable with the same name.

Q 23 - Which of the following is correct about callbacks?

A - A callback is a plain JavaScript function passed to some method as an argument or option.

B - Some callbacks are just events, called to give the user a chance to react when a certain state is triggered.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

A callback is a plain JavaScript function passed to some method as an argument or option. Some callbacks are just events, called to give the user a chance to react when a certain state is triggered.

Q 24 - Which built-in method returns the character at the specified index?

A - characterAt()

B - getCharAt()

C - charAt()

D - None of the above.

Answer : C

Explanation

charAt() method returns the character at the specified index.

Q 25 - Which built-in method combines the text of two strings and returns a new string?

A - append()

B - concat()

C - attach()

D - None of the above.

Answer : B

Explanation

concat() method returns the character at the specified index.

Answer Sheet

Question Number	Answer Key
1	D
2	D
3	C
4	D
5	D
6	A
7	C
8	C
9	C
10	A
11	C
12	A
13	D
14	A
15	C
16	A
17	A
18	A
19	B
20	A
21	B
22	B
23	C
24	C
25	B

Download

javascript_questions_answers.htm

Question Number	Answer Key
1	D
2	D
3	C
4	D
5	D
6	A
7	C
8	C
9	C
10	A
11	C
12	A
13	D
14	A
15	C
16	A
17	A
18	A
19	B
20	A
21	B
22	B
23	C
24	C
25	B

Question Number	Answer Key
1	D
2	D
3	C
4	D
5	D
6	A
7	C
8	C
9	C
10	A
11	C
12	A
13	D
14	A
15	C
16	A
17	A
18	A
19	B
20	A
21	B
22	B
23	C
24	C
25	B

Question Number	Answer Key
1	D
2	D
3	C
4	D
5	D
6	A
7	C
8	C
9	C
10	A
11	C
12	A
13	D
14	A
15	C
16	A
17	A
18	A
19	B
20	A
21	B
22	B
23	C
24	C
25	B