Browse topic-based Ruby practice sets.
96 practice sets · Page 5 of 5
Which of the following is supported by Ruby?
Multiple Programming Paradigms
Dynamic Type System
Automatic Memory Management
All of the Mentioned
Correct Answer: D — All of the Mentioned
Explanation:
Ruby supports all the features because it is a object oriented programming language.
Ruby is an object oriented general purpose programming language.
True
False
Correct Answer: A — True
Explanation:
Ruby allow users to manipulate data structures called objects to build and execute programs.
Ruby does not support ++ operator, it only supports += operator.
True
False
Correct Answer: A — True
Explanation:
Ruby does not support ++ or - operator. It only supports += or -= operator.
What does the **= assignment operator do?
Multiplies the value twice
It is used as exponent like 2**3=8
It is the multiplication operator.
None of the mentioned
Correct Answer: B — It is used as exponent like 2**3=8
Explanation:
a=2 means a to the power of two.
Which of the following is a valid assignment operator?
+=
-=
*=
All of the mentioned
Correct Answer: D — All of the mentioned
Explanation:
Assignment operators are (+=, -=, =, /=, *=).
Array of arrays are called multidimensional arrays.
True
False
Correct Answer: A — True
Explanation:
We can put anything in an array and make it array of arrays.
Each element in an array has an index and the starting index is index 1.
True
False
Correct Answer: B — False
Explanation:
Array's starting index is index 0 not index 1.
Arrays can be used to store multiple values in one single variable.
True
False
Correct Answer: A — True
Explanation:
We can store multiple value in one single variable known as arrays.
What does %x!ls! represents?
Same as back tick command output ls
Same as 'x'
Same as "xls"
None of the mentioned
Correct Answer: A — Same as back tick command output ls
Explanation:
It is same as back tick command output ls.
What does %Q{ Learn ruby language } represents?
" Learn Ruby language "
"%{ Learn Ruby language }"
"%Q{ Learn Ruby language }"
None of the mentioned
Correct Answer: A — " Learn Ruby language "
Explanation:
Anything inside %Q{} is written inside "".
What does %{Learn ruby language} represents?
"Learn Ruby language"
"%{Learn Ruby language}"
" Learn Ruby language "
None of the mentioned
Correct Answer: A — "Learn Ruby language"
Explanation:
Anything written inside %{} is same as anything written inside "".
What do we mean by expression substitution?
Embedding the value of Ruby expression into a string using #{ }
Substituting string functions
Storing string value
None of the mentioned
Correct Answer: A — Embedding the value of Ruby expression into a string using #{ }
Explanation:
Strings are displayed #{} sequence.
What is the role of ! at the end of the capitalize method?
It is the syntax for using capitalize method
It modifies the value stored in the variable
It indicates the termination of string
None of the mentioned
Correct Answer: B — It modifies the value stored in the variable
Explanation:
It is used for modifying the variable.
What is the use of .capitalize method?
It capitalizes the entire string
It capitalize on the first letter of the string
It capitalize the strings which are in small case
All of the mentioned
Correct Answer: B — It capitalize on the first letter of the string
Explanation:
It capitalizes only the first letter.
The .upcase and .capitalize method are used for capitalizing the whole string.
True
False
Correct Answer: B — False
Explanation:
The .capitalize method doesn't change the whole string to uppercase, it just capitalizes the first letter.
It is possible to make array of booleans.
True
False
Correct Answer: A — True
Explanation:
Arrays of strings, numbers, booleans can be made.
