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Perl Online Quiz
Following quiz provides Multiple Choice Questions (MCQs) related to Perl. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.
Q 1 - Which of the following correctly describes scalar data types in Perl?
A - These are simple variables. They are preceded by a dollar sign ($).
B - These are ordered lists of scalars that you access with a numeric index which starts with 0.
C - These are unordered sets of key/value pairs that you access using the keys as subscripts.
Answer : A
Explanation
Scalars are simple variables. They are preceded by a dollar sign ($). A scalar is either a number, a string, or a reference. A reference is actually an address of a variable, which we will see in the upcoming chapters.
Q 2 - Which of the following special variable represents current package name?
Answer : A
Explanation
_PACKAGE_ -represents current package name.
Q 3 - Which of the following method splits a string into an array of strings, and returns it?
A - splice @ARRAY, OFFSET [ , LENGTH [ , LIST ] ]
B - split @ARRAY, OFFSET [ , LENGTH [ , LIST ] ]
Answer : B
Explanation
split [ PATTERN [ , EXPR [ , LIMIT ] ] ] - This function splits a string into an array of strings, and returns it. If LIMIT is specified, splits into at most that number of fields. If PATTERN is omitted, splits on whitespace.
Q 4 - How will you get the size of a Hash?
Answer : A
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.
Q 5 - Which of the following statement repeats a statement or group of statements until a given condition becomes true. It tests the condition before executing the loop body?
Answer : B
Explanation
until loop − Repeats a statement or group of statements until a given condition becomes true. It tests the condition before executing the loop body.
Q 6 - Which of the following operator returns true if the left argument is stringwise greater than the right argument?
Answer : B
Explanation
gt − Returns true if the left argument is stringwise greater than the right argument.
Q 7 - Which of the following operator returns true if the left argument is stringwise not equal to the right argument?
Answer : B
Explanation
ne − Returns true if the left argument is stringwise not equal to the right argument.
Q 8 - Which of the following function returns the current local time on the machine that runs the script?
Answer : A
Explanation
localtime − returns the current local time on the machine that runs the script.
Q 9 - Which of the following function opens a file in writing mode without truncating the file?
Answer : C
Explanation
open(DATA, "+<file.txt"); − opens a file in writing mode without truncating the file.
Q 10 - Which of the following is true about dereferencing?
A - Dereferencing returns the value from a reference point to the location.
Answer : C
Explanation
Both of the above options are correct.