Perl Test Answers
·
1. Context in Perl can be.
Answers:
• conditional,
referenced, literal, null
• numeric,
string, list, scala
• associative,
numeric, scalar, sparse
• inary, string, list, scala
• Boolean,
numeric, string, null
2. A label, in Perl, is.
Answers:
• a marker for
the Perl interprete
• a heading
• a switch statement
• the name of an
operator
• a component
embedded in the code
3. How many times does the do statement allow
you to execute the block of statements in a loop?
Answers:
• Does not allow
you to execute statements in a loop
• At least once
• Twice
• Depends on the
number of times specified
• An indefinite
number of times
4. A directory handle.
Answers:
• is a program
that handles your operating system
• is a link from your computer
program to the directory on your file system
• does not have
its own namespace
• cannot be
considered equivalent to a file handle
• does not
require the opendir function
5. A scalar variable can contain.
Answers:
• only one data item at a time
• several data
items at a time, the number of which needs to be declared beforehand
• unlimited items
• two items at a
time
• an array of
data items
6. How are hash references created?
Answers:
• % $ reference
• $ reference = \ % hash;
• @ reference = \
% hash;
• % hash=$reference;
• $$reference= \
% hash;
7. How is an array assigned to an array?
Answers:
•
@array1=@array[1...6];
•
@array1=@array2;
• @array=(1,
"string", 4,5, \@ array z);
• By creating
another array object
• An array cannot be assigned to an
array
8. Non-associative operators are those that.
Answers:
• do not bind at
all
• change their
associativity depending on the context
• do not show precedence
• ind themselves
to whichever expression they are adjacent to
• do not
associate the lvalue with the expression on the right
9. Dereferencing refers to:
Answers:
• accessing an
array that contains a reference to another array
• removing the
reference
• an undefined or
empty reference
• accessing values referred to by
Perl references
• a scalar
variable that keeps track of where another variable is stored in memory
10. Context in Perl can be:
Answers:
• conditional,
referenced, literal, null
• numeric,
string, list, scalar
• associative,
numeric, scalar, sparse
• inary, string, list, scalar
• Boolean,
numeric, string, null
11. A scalar variable can contain:
Answers:
• only one data item at a time
• several data
items at a time, the number of which needs to be declared beforehand
• unlimited items
• two items at a
time
• an array of
data items
12. Non-associative operators are those that:
Answers:
• do not bind at
all
• change their
associativity depending on the context
• do not show precedence
• bind themselves
to whichever expression they are adjacent to
• do not
associate the lvalue with the expression on the right
13. When are the environment variables created?
Answers:
• Each time you
run a program
• When you save a
program
• When you
compile a program
• The first time
you run a program
• When you run a
program in the Unix command shell
14. What is meant by variable interpolation?
Answers:
• Exchanging the
values of one variable with anothe
• Passing a
variable as an argument to a function
• The process of
making a variable part of the namespace table
• The process of
assigning some value to a variable
• The process of
interpreting characters in a string literal surrounded by double quotation
marks
15. Scalar variables can contain.
Answers:
• numeric data
• string data
• either numeric
or string data
• null values
• Boolean values
16. What should be the first character of a
format code?
Answers:
• + or -
• x
• &
• %
• @
17. The bless operato
Answers:
• creates
references to objects that are not named
• creates a link
between the reference object and the class the object is created within
• contains the
literal name of another variable
• eferences a
subroutine
• efers to
literals
18. What is the following code an example of?
$hitCounter=sub {print
"This page has been called $hits times";};
Answers:
• Anonymous array
• Anonymous hash
• Object
reference
• Subroutine
• Anonymous
subroutine
19. What is the following code an example of?
$hitCounter=sub {print "This page has been called $hits times";};
Answers:
• Anonymous array
• Anonymous hash
• Object
reference
• Subroutine
• Anonymous
subroutine
20. Which of the following begins or ends a
system command string in Perl?
Answers:
• font
size=5>"</font
• font
size=5>'</font
• font
size=5><></font
• font
size=5><!</font
• font
size=5>`</font
21. The keyword 'my' is used to declare
Answers:
• comments
• are words
• default
variables
• Lexical
variables
22. The foreach loop is usually used to
process.
Answers:
• arrays and
hashes
• a block of
statements a number of times
• lists
•
multi-dimensional arrays
• namespaces
23. The s/// function.
Answers:
• substitutes one
string for another string
• eturns the
first position of a substring
• eturns the last
position of a substring
• eturns the
number of characters of a string
• eturns or
modifies a substring
24. Which of the following can be used with
the do statement?
Answers:
• A label modifie
• next
• while
• edo
• last
25. The s/// function:
Answers:
• substitutes one
string for another string
• returns the
first position of a substring
• returns the
last position of a substring
• returns the
number of characters of a string
• returns or
modifies a substring
26. The following code is an example of which
switch syntax option?
GetOptions("extension:s");
Answers:
• Sets the
default syntax
• Allows the
option to be negated
• Sets the input
option to include a mandatory string argument
• Sets the input
option to include a mandatory integer argument
• Sets the input
option to include an optional string argument
27. The foreach loop is usually used to
process:
Answers:
• arrays and
hashes
• a block of
statements a number of times
• lists
•
multi-dimensional arrays
• namespaces
28. The bless operator:
Answers:
• creates
references to objects that are not named
• creates a link
between the reference object and the class the object is created within
• contains the
literal name of another variable
• references a
subroutine
• refers to
literals
29. What does the abs_path method do?
Answers:
• Gets the
current working directory
• Gets the
absolute path of the paramete
• Gets the
absolute path of the input paramete
• Gets the
absolute path of the current working directory
• Gets the
current paramete
30. An atom cannot be
Answers:
• a single
character or digit, A-Z, a-z, 0-9
• an escaped
meta-characte
• an escaped
special meaning characte
• a regular
expression enclosed in parenthesis
• a meta characte
31. Which of the following is not an alignment
character?
Answers:
•
•
• |
• &
• #
32. Which of the following translation
modifiers matches all characters that are not part of the search string?
Answers:
• d
• s
• c
• x
• z
33. The value assigned to an array cell must
be.
Answers:
• a scalar value
• a variable
value
• a scalar or a
variable value that resolves to a scalar value
• null
• None of the
above
34. Which of the following characters denotes
a comment in Perl?
Answers:
• //
• #
• /*
• &
• *
35. What does the pop function do?
Answers:
• Takes elements
off the end of an array
• Puts elements
into the first cell index of an array
• Adds an element
to the end of an array
• Takes elements
off the first index of the array
• Modifies or
deletes elements from the array
36. Which one of the following is a part of
the if family of branching statements in Perl?
Answers:
• if
• if else
• if elsif
• if, if else,
and if elsif
• None of the
above
37. Which of the following loops is usually
used to process arrays?
Answers:
• while
• until
• do
• for / foreach
38. Which of the following can replace if
else?
Answers:
• ? :
• : ?
• ! :
• / ?
• ? /
39. Which of the following is not a rule for
switches using the Getopt function?
Answers:
• Switches begin
with a dash character (-)
• Switches that
do not take a parameter are set to the value 0
• Switches that
take a parameter may or may not have space between the switch name and the
switch value
• Switches are
not required to be in any orde
• Switches are
case-sensitive
40. Of which of the following switch syntax
options is the following code an example of?
GetOptions("extension:s");
Answers:
• Sets the
default syntax
• Allows the
option to be negated
• Sets the input
option to include a mandatory string argument
• Sets the input
option to include a mandatory integer argument
• Sets the input
option to include an optional string argument
41. What does @ARGV refer to?
Answers:
• The number of
elements in an array
• An array loaded
with the command-line arguments
• A file handle
used when processing an array
• A file
associated with a file handle
• The name of
your program
42. What are bare words?
Answers:
• Comments with
the # sign missing
• Improperly
declared variables
• Operators
• Character
strings without surrounding quotation marks
• Characters
denoting a string
43. What does the following error indicate?
"Can't Locate Function in @INC"
Answers:
• You misspelled
a function name
• The last line
of the required file returned a zero or null value
• You forgot to
type the comma after the first argument of a function
• Your code is
using a function that has been replaced by a newer function
• You used an
uninitialized value
44. Dereferencing refers to.
Answers:
• accessing an
array that contains a reference to another array
• emoving the
reference
• an undefined or
empty reference
• accessing
values referred to by Perl references
• a scalar
variable that keeps track of where another variable is stored in memory
45. Which of the following is not true of
labels?
Answers:
• A label can go
on any line
• A label must
begin with a character followed by any combination of letters or numbers that
end with a colon
• Reserved words
cannot be used as labels
• Labels are case
sensitive
• A label
performs the same function as the last command
46. Which of the following operators is
associated with writing to a program?
Answers:
• +
•
•
• | filename
• filename |
47. Which of the following characters is the
variable designator for scalar variables?
Answers:
• @
• %
• $
• *
• &
48. The syntax of the sort function without a
special purpose sort subroutine is:
Answers:
• sort ( ) {$b
cmp $a ;}
• lvalue=sort
list
• $ name= ~tr/+/
/;
• sortDescending
( ) {$b cmp $a;}
• lvalue=sort
subroutineName list;
49. Which of the following meta characters
creates a single expression or atom?
Answers:
• { }
• ( )
• *
• +
• ?
50. What does the following compound
assignment operator signify?
| =
Answers:
• Exclusive OR
the expression on the left of the operator with the expression on the right of
the operator
• Logical OR the
expression on the left of the operator with the expression on the right of the
operator
• Left shift the
expression on the left of the operator by the expression on the right of the
operator
• Binary OR the
expression on the left of the operator with the expression on the right of the
operator
• Append the
expression on the left of the operator with the expression on the right of the
operator
51. Which of the following is not a feature of
Perl?
Answers:
• Portability
• Interpreted
language
• Compiled
language
• Is used for CGI
applications
• Was originally
used to generate reports that tracked errors
52. Which of the following is not a type of
reference variables?
Answers:
• Direct
• Constant
• Subroutine
• Numeric
• Symbolic
53. What does the switch syntax :f do?
Answers:
• It allows the
option to be negated
• It sets the
default syntax
• It sets the
input option to include an optional real-number argument
• It sets the
input option to include an optional integer argument
• It sets the
input option to include a mandatory real-number argument
54. The syntax of assigning to an array cell
is.
Answers:
• array=new
Array(n);
•
scalar=@array[cellIndex]
•
@array[cellIndex]=scalar;
•
$array[cellIndex]=scalar;
•
$array[n]=newArray;
55. Which of the following pertains to IO:
:Handle?
Answers:
• Base class for
IO classes
• Interface to
file-open functions
• Get the file
descripto
• Interface to
IO: : *classes
• Export file
symbols
56. Which of the following operators has/have
the highest precedence?
Answers:
•
Increment/decrement
• NOT, escape,
sign operator
• Dereference
operator
• Exponential
operator
• Parenthesis,
function, quotation marks
57. Which of the following Getopt::Long
Configuration variables refers to an internal error flag?
Answers:
• debug
• orde
• pass_through
• null
• error
58. The syntax of the heredoc operator is.
Answers:
• print
>>heredoc - marker;
• print
<<heredoc - marker;
• select
<<heredoc - marker;
• print <<
heredoc -label;
• printlist
<<heredoc -label;
59. Which of the following file functions gets
the file descriptor of a file handle?
Answers:
• fcntl
• flock
• getc
• fileno
• link
60. Which of the following is not true
regarding scalar variable names?
Answers:
• Variable names
that begin with an underscore or an alphabet character may have any practical
length
• The characters
that follow variable names that begin with an underscore or alphabet character
may be digits, underscores or alphabet characters
• If a variable
name begins with a digit, it may be of any practical length but can contain
only digits
• If a variable
name begins with a non-alphanumeric character, it can only be one character
long
• Variable names
can contain spaces
61. What does Perl stand for?
Answers:
• Programmer's
Extraction Report Language
• Practical Extra
Reference Language
• Practical
Extraction and Report Language
• Practical
Evolving Report Language
• Practical Error
Report Language
62. What does a print FILEHANDLE list do?
Answers:
• Prints to
FILEHANDLE the data in list
• Prints the
contents of the default special variable $_ to FILEHANDLE
• Prints to the
default selected file handle the data in list
• Prints to the
default selected file handle the contents of the default special variable $_
• None of the
above
63. Which of the following parameters does the
printf function take?
Answers:
• An output file
handle which is optional
• A format string
which can include the format codes
• The variables
to be formatted
• All of the
above
• Does not take
any parameters
64. What does the directory function telldir
do?
Answers:
• Changes the
current directory
• Closes a
directory handle
• Creates a new
directory
• Opens a
directory handle
• Gets a
directory handle's current byte offset
65. What does the ord string function do?
Answers:
• Returns or
modifies a sub string
• Translates a
number into a characte
• Creates a
delineated string from an input list
• Returns the
number of characters in a string
• Converts ASCII
characters into their numeric value
66. Which of the following executes the
continue block of statements before returning execution to the top of the loop?
Answers:
• last
• edo
• less
• next
• lu
67. What does the following syntax indicate?
$lvalue=join(delimiter, list);
Answers:
• Creates a
single delineated string from an input list
• Translates a
number into a characte
• Returns the
first position of a substring
• Returns the
number of characters in a string
• Returns the
last position of a substring
68. To start the Perl debugger, what will you
type at the command prompt?
Answers:
• perld
• DB<1
• perl
errorMessage.pl-d
• perl -d
filename.pl
• perl-w
programName.pl
69. What does the pattern modifier m do?
Answers:
• Ignores the
character case when matching the pattern
• Compiles the
pattern and interprets it only the first time it occurs
• Treats the
input string as if it were a single line
• Treats the
input string as if it were multiple lines
• Allows a
comment character in the pattern
70. Scalar variables can contain:
Answers:
• numeric data
• string data
• either numeric
or string data
• null values
• Boolean values
71. An atom cannot be:
Answers:
• a single
character or digit, A-Z, a-z, 0-9
• an escaped
meta-character
• an escaped
special meaning character
• a regular
expression enclosed in parenthesis
• a meta character
72. What does the following syntax indicate?
$lvalue=join(delimiter, list);
Answers:
• Creates a
single delineated string from an input list
• Translates a
number into a character
• Returns the
first position of a substring
• Returns the
number of characters in a string
• Returns the
last position of a substring
73. The value assigned to an array cell must
be:
Answers:
• a scalar value
• a variable
value
• a scalar or a
variable value that resolves to a scalar value
• null
• None of the
above
