Perl MCQ (Multiple Choice Questions) With Answers, Perl Online Quiz

1 .

Who is designed and developed Perl?

A)

Tim O'Reilly

B)

Larry Wall

C)

Jimmy Wales

D)

James Gosling

Correct Answer : Larry Wall

Explanation : In December 1987 American programmer and linguist Larry Wall first released Perl 1.0 for computers running the UNIX operating system.

2 .

When was Perl language released?

A)

December 1961

B)

December 1969

C)

December 1978

D)

December 1987

Correct Answer : December 1987

Explanation : Perl was developed by Larry Wall in December 1987 as a general-purpose Unix scripting language to make report processing easier.

3 .

Which of the following data types are preceded by a dollar sign ($) in Perl?

A)

Array

B)

Hashes

C)

Scalar

D)

All of the above.

Correct Answer : Scalar

4 .

In which of the following variable context, an expression is being evaluated to see whether it's true or false?

A)

List

B)

Void

C)

Boolean

D)

Scalar

Correct Answer : Boolean

Explanation : Boolean context is simply any place where an expression is being evaluated

5 .

Which of the following method joins the separate strings of LIST into a single string with fields separated by the value of EXPR, and returns the string?

A)

join EXPR, LIST

B)

sort EXPR, LIST

C)

split EXPR, LIST

D)

splice EXPR, LIST

Correct Answer : join EXPR, LIST

Explanation : This function joins the separate strings of LIST into a single string with fields separated by the value of EXPR, and returns the string.

6 .

Which of the following function returns a single character from the specified FILEHANDLE, or STDIN if none is specified?

A)

seek

B)

getc

C)

close

D)

None of the above.

Correct Answer : getc

Explanation : The getc function returns a single character from the specified FILEHANDLE, or STDIN if none is specified.

7 .

Which of the following operator is used when the current value of a variable must be visible to called subroutines?

A)

local

B)

my

C)

state

D)

None of the above.

Correct Answer : local

Explanation : The local is used when the current value of a variable must be visible to called subroutines.

8 .

Which of the following operator dereferences a variable?

A)

..

B)

--

C)

++

D)

->

Correct Answer : ->

Explanation : -> − The arrow operator is mostly used in dereferencing a method or variable from an object or a class name.

9 .

Which of the following operator encloses a string with-in single quotes?

A)

qq{ }

B)

qx{ }

C)

q{ }

D)

enclose{}

Correct Answer : q{ }

Explanation : q{ } − Encloses a string with-in single quotes.

10 .

Which of the following function returns all keys of a Hash?

A)

values

B)

keys

C)

Both of the above.

D)

None of the above.

Correct Answer : keys

Explanation : keys − You can get a list of all of the keys from a hash by using keys function.

11 .

Which of the following operator performs exponential (power) calculation on operators?

A)

*

B)

**

C)

/

D)

%

Correct Answer : **

Explanation : ** − Exponent − Performs exponential (power) calculation on operators.

12 .

Which of the following operator checks if the value of left operand is less than the value of right operand, if yes then condition becomes true?

A)

>

B)

>=

C)

<=

D)

<=>

Correct Answer : >

Explanation : > − Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true.

13 .

Which of the following is correct about Perl?

A)

Perl's DBI package makes web-database integration easy.

B)

Perl can handle encrypted Web data, including e-commerce transactions.

C)

Perl is an interpreted language, which means that your code can be run as is, without a compilation stage that creates a non portable executable program.

D)

All of the above.

Correct Answer : All of the above.

14 .

Which of the following special variable represents current package name?

A)

Package

B)

PACKAGE

C)

_PACKAGE_

D)

None of the above.

Correct Answer : _PACKAGE_

Explanation : _PACKAGE_ represents current package name.

15 .

Which of the following method shifts the first value of the array off and returns it, shortening the array by 1 and moving everything down?

A)

pop @ARRAY

B)

push @ARRAY, LIST

C)

shift @ARRAY

D)

unshift @ARRAY, LIST

Correct Answer : shift @ARRAY

Explanation : shift @ARRAY − Shifts the first value of the array off and returns it, shortening the array by 1 and moving everything down.

16 .

Parameters of a function can be acessed inside the function using the special array @_?

A)

True

B)

False

C)

--

D)

--

Correct Answer : True

Explanation : Parameters can be acessed inside the function using the special array @_. Thus the first argument to the function is in $_[0], the second is in $_[1], and so on.

17 .

Which of the following code create a reference for a hash?

A)

$ref = \$foo;

B)

$ref = \%ENV;

C)

$ref = \@ARGV;

D)

$ref = \&PrintHash;

Correct Answer : $ref = \%ENV;

Explanation : You can create a reference for any hash by prefixing it with a backslash as follows - $ref = \%ENV;

18 .

Which of the following is true about lexical scoping?

A)

Lexical scoping is done with my operator.

B)

The my operator confines a variable to a particular region of code in which it can be used and accessed. Outside that region, this variable cannot be used or accessed.

C)

A lexical scope is usually a block of code with a set of braces around it, such as those defining the body of the subroutine or those marking the code blocks of if, while, for, foreach, and eval statements.

D)

All of the above.

Correct Answer : All of the above.

19 .

Which of the following statement expects the expression to return a label name and then jumps to that labeled statement?

A)

goto EXPR

B)

goto &NAME

C)

goto LABEL

D)

None of the above.

Correct Answer : goto EXPR

Explanation : The goto EXPR form is just a generalization of goto LABEL. It expects the expression to return a label name and then jumps to that labeled statement.

20 .

How will you get the size of a Hash?

A)

Using scalar context

B)

using sizeof operator

C)

Both (A) and (B)

D)

None of the above.

Correct Answer : Using scalar context

Explanation : You can get the size − that is, the number of elements from a hash by using the scalar context on either keys or values.

21 .

Which one of the following is the most powerful filter?

A)

sed

B)

awk

C)

perl

D)

grep

Correct Answer : perl

Explanation : A perl is the finest filter used on the UNIX system and is the finest of all (grep, sed, awk, tr). In fact, it combines the power of these. There is nothing can these filters can do and perl can’t.

22 .

To test whether perl is in your PATH, use ____

A)

perl -i

B)

perl -e

C)

perl -el

D)

perl -ed

Correct Answer : perl -e

Explanation : Unlike other filters, script errors are generated before the execution of perl script file. To check whether perl exist on our system or not use this simple command:

23 .

It is often more convenient to save perl program files with ____ extension.

A)

.sh

B)

.gp

C)

.awk

D)

.pl

Correct Answer : .pl

Explanation : perl programs are often very big, hence it is better to use .pl extension with perl program files.

24 .

Which escape character is used for identifying a word character?

A)

\d

B)

\n

C)

\s

D)

\w

Correct Answer : \w

Explanation :

Perl offers some escaped characters to represent whitespace, digits and word boundaries. The most commonly used ones are:

\s - a whitespace character
\d - a digit
\w - a word character

25 .

Which function is used for handling substitutions in perl?

A)

s

B)

tr

C)

str

D)

tr and s

Correct Answer : tr and s

Explanation : The s and tr functions handle all substitutions in perl. The s command is used in same way as it was used in sed while tr is used translating the characters in the same way as the UNIX tr command does.

26 .

Which function is used by perl for reversing a string?

A)

reverse

B)

rev

C)

split

D)

substr

Correct Answer : reverse

Explanation :

The reverse function, which can operate on strings as well as arrays is used to reverse the characters in a string and return the reversed string. For example,

$x= “abcd” ;
print reverse($x) ;       / prints dcba

27 .

___ function is used for removing the last character from the line.

A)

cut

B)

split

C)

chop

D)

erase

Correct Answer : chop

Explanation : In many conditions, we may need to chop the last character –especially when there is a newline character. For this purpose, chop function is used.

28 .

When a string is used for numeral computations, perl converts it into ___

A)

character

B)

number

C)

boolean value

D)

floating point number

Correct Answer : number

Explanation : There are some attributes which we should keep in mind while using perl. One of which is, when we use string for numerical comparison or computation, perl immediately converts it into a number.

29 .

If a variable is undefined, its value is ____

A)

0

B)

1

C)

NULL

D)

garbage

Correct Answer : 0

Explanation : When a variable is undefined, it is assumed to be a NULL string and NULL string is numerically zero.

30 .

Which of the following are concatenation operators?

A)

.

B)

/

C)

_

D)

\\

Correct Answer : .

Explanation :

Like in shell, concatenation is performed by placing two variables side by side. This case is not followed with perl. Rather perl uses . (dot) operator for concatenating two variables. For example,

$ perl  -e  '$x="FreeTime" ; $y="Learning" ; print($x . $y);'
FreeTimeLearning

31 .

To repeat a string, perl uses ___ operator.

A)

.

B)

/

C)

\\

D)

x

Correct Answer : x

Explanation :

perl uses the x operator to repeat a string. For example, the following command will print * 10 times;

$ perl  -e  ‘print “*” x 10 ;’
**********

32 .

Which function is used by perl for displaying the length of a string?

A)

len

B)

split

C)

length

D)

string

Correct Answer : length

Explanation :

The length function is used by perl to return the length of any string. For example,

$x= “Srinivas”;
print length($x);       // prints 8

33 .

For extracting a substring, ____ function is used.

A)

index

B)

substr

C)

string

D)

length

Correct Answer : substr

Explanation :

The substr function extracts a particular substring from a string based on the value of specified indices. For example,

$x= “abcdefghijklm”
$y= substr( $x, -3,2);   // extracts two characters from the third position on the right side
print “$y”;             // prints kl

34 .

What is the syntax to create multiline comments in Perl?

A)

#begin
#cut

B)

=begin
=cut

C)

=start
=end

D)

None of the above

Correct Answer :

=begin
=cut

Explaination :

The syntax for creating a multiline comment in Perl is :

=begin
=cut

35 .

What are the disadvantages of Perl over C/C++?

A)

Support closures

B)

It is interpreted language

C)

No main() [driver] function

D)

None of the above

Correct Answer : None of the above

Explanation :

The Perl programming language is better than the C/C++ programming language. So common advantages include:

* No main () function that acts as entry point to the program.

* It is interpreted language leading to faster compilation.

36 .

What is the correct syntax for defining a class in Perl?

A)

package class_name

B)

class class_name

C)

new class class_name

D)

new package class_name

Correct Answer : package class_name

Explanation :

The correct syntax for creating a class in Perl is : package class_name

37 .

What is called when an object is created in Perl?

A)

Variable

B)

Destructor

C)

Constructor

D)

All of the above

Correct Answer : All of the above

Explanation : The constructor of a class is the first subroutine to be called when an object of that class is initiated.

38 .

What is the correct syntax for creating a new object in Perl?

A)

new object_name = class_name()

B)

var object_name = new class_name()

C)

my object_name = new class_name()

D)

None of the above

Correct Answer : my object_name = new class_name()

Explanation :

The correct syntax for creating an object in Perl is : my object_name = new class_name()

39 .

Which of these is not a type of method in Perl?

A)

Virtual method

B)

Constant method

C)

Static method

D)

All of the Above

Correct Answer : Constant method

Explanation : Virtual methods and static methods are valid types of methods in Perl.

40 .

Destructor's in Perl are ___.

A)

Called at the start of the program

B)

Used for cleanup of reference of objects

C)

Not a program

D)

All of the above

Correct Answer : Used for cleanup of reference of objects

Explanation : Destructors in Perl are called when the object goes out of scope. It is used to clean up the reference of the object.

41 .

What is method overwriting in Perl?

A)

Filling up method with extra written data

B)

Methods that provide extra features

C)

A Feature that allows rewriting of methods in child class

D)

All of the above

Correct Answer : Filling up method with extra written data

Explanation : Method overwriting in Perl is a feature using which we can rewrite the method in child class.

42 .

Which of these are valid type of inheritance in Perl?

A)

Simple inheritance

B)

Multilevel inheritance

C)

Hierarchical inheritance

D)

All of the Above

Correct Answer : All of the Above

Explanation :

Common types of inheritance in Perl are:

Simple inheritance

Multiple inheritance

Multilevel inheritance

Hierarchical inheritance

43 .

Which module is required to perform excel operation in Perl?

A)

Excel::creator

B)

Sheets::manager

C)

Excel::Writer::XLSX

D)

None of the above

Correct Answer : Excel::Writer::XLSX

Explanation :

Module required to perform excel operation in Perl is : Excel :: Writer :: XLSX

44 .

Length of string in Perl is calculated using ___.

A)

len()

B)

size()

C)

len_size()

D)

length()

Correct Answer : length()

Explanation : The length of string in Perl is calculated using length() method.

45 .

The 'It' operator of string is used to ___.

A)

Concatenate string

B)

Substitute text

C)

Check if the string to its left is stringwise less than string to its left

D)

None of the above

Correct Answer : Check if the string to its left is stringwise less than string to its left

Explanation : The 'It' operator of string is used to check if the string to its left is stringwise less that string to its left.

46 .

The '==' operation is not valid on string in Perl?

A)

True

B)

False

C)

--

D)

--

Correct Answer : True

Explanation : The == operation in Perl is not a valid comparison operator on strings.

47 .

What will be the output of the following Perl code?

%lang = ('Perl' => 4, 'Python' => 2, 'Javascript' => 5);
@arr = values %lang;
print @arr

A)

245

B)

425

C)

PerlPythonJavascript

D)

None of the above

Correct Answer : 425

48 .

What is a hash in Perl?

A)

Collection sorting array

B)

Set of key-value pair

C)

Collection storing scalar

D)

None of the above

Correct Answer : Set of key-value pair

Explanation : Hash in Perl is a set of key-value pairs.

49 .

Which is a valid way to extract the size of an array in Perl?

A)

_len(@array_name)

B)

@array_name.length()

C)

$size = scalar @array_name

D)

All of the above

Correct Answer : $size = scalar @array_name

Explanation :

The valid way to extract the size of an array in Perl is : $size = scalar @array_name

50 .

Which keyword is used to make the current iteration last one?

A)

end

B)

exit

C)

Both (A) and (B)

D)

last

Correct Answer : last

Explanation : The last keyword in Perl can make the current iteration of the loop the last one.

51 .

Is the Redo operator in Perl used?

A)

Create a loop

B)

Repeat current block evaluation

C)

Jump the flow to the given label skipping the current block execution

D)

All of the above

Correct Answer : Jump the flow to the given label skipping the current block execution

Explanation : The redo operator is used to Jump the flow to the given label skipping the current block execution.

52 .

Is the goto statement in Perl used to ______.

A)

Iterate over statements

B)

Create an entry point in program

C)

Jump from anywhere to anywhere within the block

D)

None of the above

Correct Answer : Jump from anywhere to anywhere within the block

Explanation : The goto statement in Perl is used to jump from anywhere to anywhere with the block of code.

53 .

What is a given-when statement in Perl?

A)

Loop

B)

String

C)

Function

D)

Multiway branch statement

Correct Answer : Multiway branch statement

Explanation : Given-when in Perl is a multiway branch statement.

54 .

What will be the output of the following Perl code?

$a = 8;

until ($a <= 7){
    print "Value of a = $a\n";
    $a = $a - 1;
}

A)

Value of a = 8

B)

Infinite loop

C)

Code Error

D)

None of the above

Correct Answer : Value of a = 8

55 .

Valid loops in Perl are ___.

A)

for

B)

foreach

C)

do while

D)

All of the above

Correct Answer : All of the above

Explanation : Valid loops in Perl are for, foreach, while, do while, until, nested loop.

56 .

Unless_elsif statement contains ______.

A)

if nested inside unless

B)

elsif statement along with unless

C)

unless nested inside elsif

D)

None of the above

Correct Answer : elsif statement along with unless

Explanation : unless elsif statement has elseif statement working with unless.

57 .

STDIN in Perl stands for ___.

A)

STandarD INput

B)

Simple Date Input

C)

Standard input output stream

D)

None of the Above

Correct Answer : STandarD INput

58 .

Automatic end of line is added using which statement?

A)

print()

B)

clear()

C)

say()

D)

loop()

Correct Answer : say()

Explanation : The say() method is used to display expressions in Perl. It automatically adds the end of line after print.

59 .

The return() function in Perl is ___.

A)

return named subroutine

B)

return value at the end of subroutines

C)

a subroutine from return package

D)

None of the above

Correct Answer : return value at the end of subroutines

Explanation : The return() function in Perl is used to return values at the end of subroutines.

60 .

A built-in subroutine which is used inside the method is?

A)

Trait

B)

Method

C)

Mutable parameter

D)

All of the above

Correct Answer : Trait

Explanation : Trait is a built-in subroutine which is used inside the method.

61 .

Immutable parameters in Perl are?

A)

Values that cannot be modified within the function

B)

Values that can be modified within the function

C)

Special immutable string parameters passed to the function

D)

None of the above

Correct Answer : Values that cannot be modified within the function

Explanation : Immutable parameters in Perl are values that cannot be modified within the function.

62 .

Arguments in Perl are passed as ___.

A)

Strings

B)

Values

C)

Both (A) and (B)

D)

Array

Correct Answer : Array

63 .

Which of these is a valid way to define a function in Perl?

A)

function function_name{ }

B)

returntype function_name{ }

C)

sub function_name{ }

D)

None of the Above

Correct Answer : sub function_name{ }

Explanation :

The valid method to define a function in Perl : sub function_name{}

64 .

A group of statements that perform a specific task is known as ___.

A)

Method

B)

Function

C)

Subroutine

D)

All of the above

Correct Answer : All of the above

Explanation : A group of statements that perform a specific task is known as function or subroutine or method.

65 .

Which method in Perl is used to delete a directory?

A)

cldir

B)

rmdir

C)

chdir

D)

deldir

Correct Answer : rmdir

Explanation : In Perl, rmdir is used to delete a directory.

66 .

The chdir() function used to ___.

A)

Change directory

B)

Create directory

C)

Remove directory

D)

None of the above

Correct Answer : Change directory

Explanation : The chdir() function used to change the current directory in Perl.

67 .

What is a directory in Perl?

A)

A data structure

B)

An array to string

C)

A place to store values in the form of a list

D)

None of the above

Correct Answer : A place to store values in the form of a list

Explanation : In Perl, Directory is a place to store values in the form of a list.

68 .

Which escape sequence is used to print hexadecimal of a number in Perl?

A)

%b

B)

%x

C)

%h

D)

%hex

Correct Answer : %x

Explanation : The "%x" character sequence is used to print the number's hexadecimal conversion.

69 .

Which statement in Perl is used to import a module?

A)

use module_name

B)

import module_name

C)

include module_name

D)

None of the above

Correct Answer : use module_name

Explanation : The "use" keyword in Perl is used to import a module in Perl.

70 .

'Our' keyword is used to ___.

A)

Create a new array

B)

Create a new variable

C)

Create a virtual variable

D)

Create an alias to package

Correct Answer : Create an alias to package

Explanation : The "Our" keyword is used to create an alias to package.

71 .

Global scope variables can be used :

A)

Inside a specific block

B)

Inside any function or block

C)

Inside a specific function

D)

None of the above

Correct Answer : Inside any function or block

Explanation : Global scoped variable is declared outside all blocks of code. The scope of this variable inside any function or block.

72 .

Scalar variables in Perl are ___.

A)

Array values

B)

String Values

C)

String_len Values

D)

A Single unit of data

Correct Answer : A Single unit of data

Explanation : Scalar variables in Perl are a single unit of data. Different types of scalars in Perl are string, character, floating point, large group of string, webpage, etc.

73 .

Which of these is not a basic data type in Perl?

A)

Arrays

B)

Scalars

C)

Integer

D)

None of the above

Correct Answer : Integer

Explanation :

Perl in basic data types are :

* Scalar variable

* Array variable

* Hash variable

74 .

What is multiple inheritance in Perl?

A)

When a class inherits more than two classes

B)

When two classes inherit properties from a single class

C)

When more than two different inheritance takes place in a single program.

D)

None of the above

Correct Answer : When a class inherits more than two classes

Explanation : In multiple inheritance, one class inherits more than two classes in Perl.

75 .

What is multilevel inheritance in Perl?

A)

Multiple classes inherit properties from a class

B)

A subclass of a class is inherited by another class

C)

A class inherits properties from multiple classes

D)

None of the above

Correct Answer : A subclass of a class is inherited by another class

Explanation : In multilevel inheritance, a subclass of a class is inherited by another class in Perl.

76 .

What is polymorphism in Perl?

A)

Creating multiple variables with the same name

B)

Creating multiple constants with the same name

C)

Defining multiple methods under the same name

D)

All of the Above

Correct Answer : All of the Above

Explanation : Polymorphism in Perl is defining multiple methods under the same name.

77 .

What is encapsulation in Perl?

A)

Creating Arrays

B)

Creating separate structures storing values

C)

Wrapping up data and related methods to a single unit

D)

All of the above

Correct Answer : Wrapping up data and related methods to a single unit

Explanation : Encapsulation is wrapping up data and related methods to a single unit in Perl.

78 .

Encapsulation is also known as?

A)

Polymorphism

B)

Data hiding

C)

Method overriding

D)

Method overloading

Correct Answer : Data hiding

Explanation : Data hiding in Perl is also known as Encapsulation.

79 .

Advantages of encapsulation are :

A)

Reusability

B)

Data hiding

C)

Ease of testing

D)

All of the Above

Correct Answer : All of the Above

Explanation :

Advantages of Encapsulation are :

* Reusability
* Data Hiding

* Increasing Flexibility

* Testing code is easy

80 .

Which statement is used to enable strict mode in Perl?

A)

Use strict;

B)

Strict mode;

C)

Use strict mode;

D)

None of the above

Correct Answer : use strict;

Explanation :

The syntax to enable strict mode in Perl is : Use strict

81 .

Which of the following is a type of operator in Perl?

A)

Arithmetic Operator

B)

Logical Operator

C)

Assignment Operator

D)

All of the above

Correct Answer : All of the above

Explanation :

Types of operators :

* Arithmetic Operator

* Relation Operator

* Logical Operator

* Bitwise Operator

* Assignment Operator

* Ternary Operator

82 .

Logical operators in Perl are ___.

A)

Used to compare values

B)

Used to perform arithmetic operations

C)

Used to combine conditions

D)

None of the above

Correct Answer : Used to combine conditions

Explanation : Logical operators in Perl are used to combine multiple conditions.

83 .

The result of the following operation is - 100 << 3

A)

001

B)

800

C)

300

D)

None of the above

Correct Answer : 800

Explaination :

The "<<" is a binary left shift operator, if left shifts the bits of the first operand, the second operand decides the number of places to shift.

84 .

Which of the following is a valid assignment operator in Perl?

A)

=

B)

+=

C)

==

D)

%=

Correct Answer : ==

Explanation :

= is simple assignment operator

+= is addition assignment operator

%= is remainder assignment operator

85 .

What will be the output of the following Perl code?

$val1 = 5;
$val2 = 10;

$result = $val1 == $val2 ? $val1 : $val2;

print "$result"

A)

1

B)

2

C)

5

D)

10

Correct Answer : 10

86 .

'x' operator on string used to?

A)

Add two strings

B)

Add x character to the string

C)

Both (A) and (B)

D)

Repeat the given string multiple times

Correct Answer : Repeat the given string multiple times

Explanation : The "x" operator in Perl strings is used to repeat the given string multiple times.

87 .

What are 'listary operators' in Perl?

A)

Operators on integers

B)

Operator on collections

C)

Operators on the list of operators

D)

All of the above

Correct Answer : Operators on the list of operators

Explanation : Listary operator is an operator that operates on a list of operands.

88 .

What is the correct operator precedence for the following operators?

&& , &, = , ->

A)

-> , & , && , =

B)

= , & , && , ->

C)

= , -> , && , &

D)

& , && , = , ->

Correct Answer : -> , & , && , =

89 .

"+=" known as ________in Perl.

A)

Assignment Operator

B)

Arithematic Operator

C)

Comparision Operator

D)

Increment/Decrement Operator

Correct Answer : Assignment Operator

Explanation : "+=" known as "Assignment operator" in Perl.

90 .

Which operator is also known as string repetition operator in perl?

A)

(.)

B)

(x)

C)

($)

D)

(++)

Correct Answer : (x)