Ruby MCQs (Chapterwise Multiple Choice Questions)

Which of the following statements regarding catch and throw blocks are true?

U Catch def‌ines a block that is labeled with the given name.

D The catch block is executed normally even if a throw is encountered.

Ll When Ruby encounters a throw. it zips back the call stack looking for a catch block with a matching symbol.

D it the input does not contain correctly formatted lines. the throw will skip to the end of the corresponding catch.

Answer & Explanation

Correct Answer: D it the input does not contain correctly formatted lines. the throw will skip to the end of the corresponding catch.

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Which of the following operators indicate continuation of a statement In Ruby?

;

+

-

\

Answer & Explanation

Correct Answer: \

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In a Ruby installed environment, what happens when "lrb" is typed in the command prompt?

it starts an interactive Ruby Session.

It enables parser debug mode.

It displays an overview of command-line options.

It overwrites the file contents with program output.

Answer & Explanation

Correct Answer: it starts an interactive Ruby Session.

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Assuming that d is an instance of Dir class:

i_i d.rewind moves the position in d to the f‌irst entry.

D d.tell returns the current position in d.

U d.read returns the current entry front d.

D d.close closes the directOry stream.

Answer & Explanation

Correct Answer: D d.close closes the directOry stream.

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Which of the following statements regarding Ruby variables is incorrect?

Local variables begin with a lowercase letter or _.

instance variables are preceded by the at sign (@) followed by the variable name.

Class variables are preceded by the sign @Q and are followed by the variable name.

Global variables are always preceded by the # character.

Answer & Explanation

Correct Answer: Global variables are always preceded by the # character.

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Which of the following is used to cancel the method definition?

def‌ined

undef

self

rescue

Answer & Explanation

Correct Answer: undef

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if there are two variables x and y, such that x=10 and y=5, then:

x + y =15

x -y = 5

x % y = 2

x ** y = 250

Answer & Explanation

Correct Answer: x -y = 5

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Which of the following statements regarding the Ruby programming language are correct?

Ruby identifiers are case insensitive

Ruby identifier names may consist of alphanumeric characters and the underscore character ( _ ).

'rescue' is a reserved word in RUBY, but it can be used as a method name.

Answer & Explanation

Correct Answer: 'rescue' is a reserved word in RUBY, but it can be used as a method name.

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Ruby Quick Quiz

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