Perl Test 2015

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