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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 IV
Q 1 - Which of the following function of String object causes a string to be displayed in a small font, as if it were in a <small> tag?
Answer : B
Explanation
small() − Causes a string to be displayed in a small font, as if it were in a <small> tag.
Q 2 - Which of the following function of String object causes a string to be displayed as struck-out text, as if it were in a <strike> tag?
Answer : C
Explanation
strike() − Causes a string to be displayed as struck-out text, as if it were in a <strike> tag.
Q 3 - Which of the following function of String object causes a string to be displayed as a subscript, as if it were in a <sub> tag?
Answer : D
Explanation
sub() − Causes a string to be displayed as a subscript, as if it were in a <sub> tag.
Q 4 - Which of the following function of String object causes a string to be displayed as a superscript, as if it were in a <sup> tag?
Answer : A
Explanation
sup() − Causes a string to be displayed as a superscript, as if it were in a <sup> tag.
Q 5 - Which of the following function of Array object returns a new array comprised of this array joined with other array(s) and/or value(s)?
Answer : A
Explanation
concat() − Returns a new array comprised of this array joined with other array(s) and/or value(s).
Q 6 - Which of the following function of Array object returns true if every element in this array satisfies the provided testing function?
Answer : B
Explanation
every() − Returns true if every element in this array satisfies the provided testing function.
Q 7 - Which of the following function of Array object creates a new array with all of the elements of this array for which the provided filtering function returns true?
Answer : C
Explanation
filter() − Creates a new array with all of the elements of this array for which the provided filtering function returns true.
Q 8 - Which of the following function of Array object calls a function for each element in the array?
Answer : D
Explanation
forEach() − Calls a function for each element in the array.
Q 9 - Which of the following function of Array object returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found?
Answer : A
Explanation
indexOf() − Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found.
Q 10 - Which of the following function of Array object joins all elements of an array into a string?
Answer : B
Explanation
join() − Joins all elements of an array into a string.
Q 11 - Which of the following function of Array object returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found?
Answer : C
Explanation
lastIndexOf() − Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found.
Q 12 - Which of the following function of Array object creates a new array with the results of calling a provided function on every element in this array?
Answer : D
Explanation
map() − Creates a new array with the results of calling a provided function on every element in this array.
Q 13 - Which of the following function of Array object removes the last element from an array and returns that element?
Answer : A
Explanation
pop() − Removes the last element from an array and returns that element.
Q 14 - Which of the following function of Array object adds one or more elements to the end of an array and returns the new length of the array?
Answer : B
Explanation
push() − Adds one or more elements to the end of an array and returns the new length of the array.
Q 15 - Which of the following function of Array object applies a function simultaneously against two values of the array (from left-to-right) as to reduce it to a single value?
Answer : C
Explanation
reduce() − Applies a function simultaneously against two values of the array (from left-to-right) as to reduce it to a single value.
Q 16 - Which of the following function of Array object applies a function simultaneously against two values of the array (from right-to-left) as to reduce it to a single value?
Answer : D
Explanation
reduceRight() − Applies a function simultaneously against two values of the array (from right-to-left) as to reduce it to a single value.
Q 17 - Which of the following function of Array object reverses the order of the elements of an array?
Answer : A
Explanation
reverse() − Reverses the order of the elements of an array.
Q 18 - Which of the following function of Array object removes the first element from an array and returns that element?
Answer : B
Explanation
shift() − Removes the first element from an array and returns that element.
Q 19 - Which of the following function of Array object extracts a section of an array and returns a new array?
Answer : C
Explanation
slice() − Extracts a section of an array and returns a new array.
Q 20 - Which of the following function of Array object returns true if at least one element in this array satisfies the provided testing function?
Answer : D
Explanation
some() − Returns true if at least one element in this array satisfies the provided testing function.
Q 21 - Which of the following function of Array object represents the source code of an object?
Answer : A
Explanation
toSource() − Represents the source code of an object.
Q 22 - Which of the following function of Array object sorts the elements of an array?
Answer : B
Explanation
sort() − Sorts the elements of an array.
Q 23 - Which of the following function of Array object adds and/or removes elements from an array?
Answer : C
Explanation
splice() − Adds and/or removes elements from an array.
Q 24 - Which of the following function of Array object returns a string representing the array and its elements?
Answer : D
Explanation
toString() − Returns a string representing the array and its elements.
Q 25 - Which of the following function of Array object adds one or more elements to the front of an array and returns the new length of the array?
Answer : A
Explanation
unshift() − Adds one or more elements to the front of an array and returns the new length of the array.
Answer Sheet
| Question Number | Answer Key |
|---|---|
| 1 | B |
| 2 | C |
| 3 | D |
| 4 | A |
| 5 | A |
| 6 | B |
| 7 | C |
| 8 | D |
| 9 | A |
| 10 | B |
| 11 | C |
| 12 | D |
| 13 | A |
| 14 | B |
| 15 | C |
| 16 | D |
| 17 | A |
| 18 | B |
| 19 | C |
| 20 | D |
| 21 | A |
| 22 | B |
| 23 | C |
| 24 | D |
| 25 | A |