R4RIN – MCQs, Mock Tests | Perl Perl Mcq Question Set 3

Which is the basic data type of Perl?

1. Integer
2. Scalars
3. Vectors
4. Typeglob

✅ Correct Answer: 2

How are scalars marked with?

1. #
2. !
3. $
4. %

✅ Correct Answer: 3

Which among the following are Scalars supported by Perl?

1. number,boolean, character
2. integer, boolean and character
3. number, character and reference
4. number, string and reference

✅ Correct Answer: 4

Which operator is used to compare Strings in Perl?

1. 'Computer'.equal('Computer')
2. 'Computer' eq 'Computer'
3. 'Computer' equals 'Computer'
4. 'Computer' == 'Computer'

✅ Correct Answer: 2

Which mong the following statements are/is true? S1: Attempting to use string operations on numbers will raise warnings S2: Attempting to use number operations on non-numeric strings will raise warnings

1. S1 only
2. S2 only
3. Both S1 and S2
4. Neither S1 nor S2

✅ Correct Answer: 2

Array References in Perl are _______

1. Scalars
2. Vectors
3. Typed
4. none of the above

✅ Correct Answer: 1

Which is true with respect to Array References in Perl?

1. Array References can be nested
2. Array Reference's contents can be accessed using dot(.)
3. Array References refer to Arrays,Numbers and Stirngs
4. When used as Boolean, references are not always true.

✅ Correct Answer: 1

Which operator is used to access the contents of Array References?

1. dot (.)
2. ->
3. =>
4. $

✅ Correct Answer: 2

Scalar Reference is used in which scenarios? S1: Disambiguate a file name from file content S2: Disambiguate returned content from a returned error string

1. S1 only
2. S2 only
3. Both S1 and S2
4. Neither S1 nor S2

✅ Correct Answer: 3

Which among the choices are/is false with respect to Arrays in Perl?

1. Arrays are mutable
2. Arrays store an ordered sequence of values
3. looping over the contents of an array is possible
4. Arrays are mutable and immutable

✅ Correct Answer: 4

Which of the following is not a sigil in Perl?

1. *typeglob
2. &function('arguments');
3. $#array;
4. @array = ( 1, 2, 3, 4, 5 );

✅ Correct Answer: 3

Chhose the correct Statements: S1: Typeglobs are handled when dealing with files S2: Typeglob *foo holds references to the contents of global variables

1. S1 only
2. S2 only
3. Both S1 and S2
4. Neither S1 nor S2

✅ Correct Answer: 3

Under which scenario & sigil is not used in Perl?

1. To make a reference to subroutine
2. To call a function by ignoring its prototype
3. Can be combined with goto()
4. To accept an expression

✅ Correct Answer: 4

Which of the following acepts an expression in Perl?

1. @{}
2. @()
3. $()
4. ${}

✅ Correct Answer: 1

Which of the statements are false with respect to Hash References in perl? S1: Hash references are scalars S2: Any changes made within the subroutine will be made to the original hash

1. S1 only
2. S2 only
3. Both S1 and S2
4. Neither S1 nor S2

✅ Correct Answer: 4

In Perl, if the keys in Hash are not strings-then

1. Throws compile time error
2. get converted to strings
3. automatic conversion to strings is not handled
4. treated as barewords

✅ Correct Answer: 2

How to access an element of %hash?

1. $hash{key}
2. %hash{key}
3. @hash{key}
4. #hash{key}

✅ Correct Answer: 1

Which among the following helps to create hashes out of arrays?

1. array and list flattening
2. map and list flattening
3. array and map flattening
4. map and tuple flattening

✅ Correct Answer: 2

When does hashes becomes true if used as boolean?

1. When they are empty
2. When they are barewords
3. When they are converted to map
4. When they not empty

✅ Correct Answer: 4

Which among the following esacpe sequence is not interpolated by Perl?

1.
2.
3.
4. v

✅ Correct Answer: 4

Which among the following statements are true? S1: Double quotes interpolate the enclosed string S2: Single quotes interpolate the enclosed string

1. S1 only
2. S2 only
3. Both S1 and S2
4. Neither S1 nor S2

✅ Correct Answer: 1

Which of the following number evaluates to true in Perl?

1. say 0 ? 'true' : 'false';
2. say -1 ? 'true' : 'false';
3. say 1-1 ? 'true' : 'false';
4. say -0.00 ? 'true' : 'false'; # false

✅ Correct Answer: 2

Which of the following Strings evaluates to false in Perl?

1. say 'a' ? 'true' : 'false';
2. say 'false' ? 'true' : 'false';
3. say ' ' ? 'true' : 'false';
4. say '0.0' ? 'true' : 'false';

✅ Correct Answer: 3

use Time::Piece; is available in which version of Perl?

1. Perl 2
2. Perl 3
3. Perl 4
4. Perl 5

✅ Correct Answer: 4

How to create a new datetime?

1. $dt = DateTime->now( time_zone => 'Asia');
2. $dt = DateTime::now( time_zone => 'Asia');
3. $dt = now::DateTime->( time_zone => 'Asia');
4. $dt = DateTime=>now( time_zone -> 'Asia');

✅ Correct Answer: 1

Which of the following conditional statements not supported by Perl?

1. unless
2. ternary
3. if-else
4. until

✅ Correct Answer: 4

Which keyword is used to create Subroutines in Perl?

1. sub
2. subroutine
3. mod
4. fn

✅ Correct Answer: 1

When functions are to be treated as variables which sigil is mandatory?

1. $
2. &
3. #
4. %

✅ Correct Answer: 2

What does the function does not output when use Data::Show; is used in Perl?

1. name of the variable
2. contents of that variable
3. address of that variable
4. the file from where show is run from

✅ Correct Answer: 3

Which is false with respect to array and list relationship?

1. Array contains a list
2. A list can be assigned to an array
3. ordered sequence of zero or more scalars
4. none of the above

✅ Correct Answer: 4

Which of the following usage of List is not allowed in Perl?

1. Assigning a list to a hash
2. Passing list to subroutines
3. Returning list from subroutine
4. Stack operation

✅ Correct Answer: 4

Choose the correct choice with respect to Perl S1: List can be assigned to hash s2: Hash can be used as list

1. S1 only
2. S2 only
3. Both S1 and S2
4. Neither S1 nor S2

✅ Correct Answer: 3

Which operator is used in comparator function to compare strings?

1. ==
2. compare
3. <=>
4. cmp

✅ Correct Answer: 4

Which operator is used in comparator function to compare numbers?

1. <=>
2. cmp
3. compare
4. ==

✅ Correct Answer: 1

Which of the following is not true with respect to Sorting in Perl? (Version > 5.16)

1. There is only one function sort used by Perl for sorting
2. Sorts nested datastructure
3. Does case senstive sort
4. Reverse Sort can be done

✅ Correct Answer: 3

What does the mode '>' write (trunc) does in Perl?

1. Will not overwrite existing files
2. Creates a new file if no file was found
3. Append new content at the end of it
4. Opens the file in read only mode

✅ Correct Answer: 2

What does the '+>' file operation denote in Perl?

1. Read / Write
2. Read / Write (trunc)
3. Read / Write (append)
4. Write (append)

✅ Correct Answer: 2

What does the '+>>' file operation denote in Perl?

1. Read / Write
2. Read / Write (trunc)
3. Read / Write (append)
4. Write (append)

✅ Correct Answer: 3

Which among the following enables faster file read?

1. File::Slurper
2. File::Dumper
3. File::Compress
4. Path::Tiny

✅ Correct Answer: 1