Javascript Mock Test
This section presents you various set of Mock Tests related to Javascript Framework . You can download these sample mock tests at your local machine and solve offline at your convenience. Every mock test is supplied with a mock test key to let you verify the final score and grade yourself.
Javascript Mock Test II
Answer : C
Explanation
forEach() method calls a function for each element in the array.
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Answer : C
Explanation
indexOf() method returns the index within the calling String object of the first occurrence of the specified value, or -1 if not found.
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Answer : A
Explanation
length() method returns the length of the string.
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Answer : C
Explanation
pop() method removes the last element from an array and returns that element.
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Answer : C
Explanation
push() method adds one or more elements to the end of an array and returns the new length of the array.
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Answer : B
Explanation
reverse() method reverses the order of the elements of an array -- the first becomes the last, and the last becomes the first.
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Answer : C
Explanation
sort() method sorts the elements of an array.
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Answer : A
Explanation
substr() method returns the characters in a string beginning at the specified location through the specified number of characters.
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Answer : A
Explanation
toLowerCase() method returns the calling string value converted to lower case.
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Answer : A
Explanation
toUpperCase() method returns the calling string value converted to upper case.
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Answer : C
Explanation
toString() method returns the string representation of the number's value.
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Q 12 - All user-defined objects and built-in objects are descendants of an object called Object?
A - true
B - false
Answer : A
Explanation
All user-defined objects and built-in objects are descendants of an object called Object.
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Answer : B
Explanation
var book = new Object(); creates an object.
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Answer : A
Explanation
toExponential(): Forces a number to display in exponential notation, even if the number is in the range in which JavaScript normally uses standard notation.
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Answer : B
Explanation
toFixed() − Formats a number with a specific number of digits to the right of the decimal.
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Answer : C
Explanation
toLocaleString() − Returns a string value version of the current number in a format that may vary according to a browser's locale settings.
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Answer : D
Explanation
toPrecision() − Defines how many total digits (including digits to the left and right of the decimal) to display of a number.
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Answer : A
Explanation
toString() − Returns a string value version of the current number.
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Answer : B
Explanation
valueOf() − Returns the number's value.
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Answer : A
Explanation
toSource() − Returns a string containing the source of the Boolean object; you can use this string to create an equivalent object.
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Answer : B
Explanation
valueOf() − Returns the primitive value of the Boolean object.
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Answer : C
Explanation
toString() − Returns a string of either 'true' or 'false' depending upon the value of the object.
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Answer : A
Explanation
charAt() − Returns the character at the specified index.
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Answer : B
Explanation
charCodeAt() − Returns a number indicating the Unicode value of the character at the given index.
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Answer : C
Explanation
concat() − Combines the text of two strings and returns a new string.
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Answer Sheet
Question Number
Answer Key
1
C
2
C
3
A
4
C
5
C
6
B
7
C
8
A
9
A
10
A
11
C
12
A
13
B
14
A
15
B
16
C
17
D
18
A
19
B
20
A
21
B
22
C
23
A
24
B
25
C
javascript_questions_answers.htm
