Browse topic-based Ruby practice sets.
96 practice sets · Page 2 of 5
Which of the following is the valid string method?
The .length method
The .upcase method
The .downcase method
The .irreverse method
Correct Answer: D — The .irreverse method
Explanation:
There is no predefined method which can reverse an already reversed string.
What will the following expression evaluate to !true && !false
True
False
Error
None of the mentioned
Correct Answer: B — False
Explanation:
Boolean operator && evaluates to true only when both the values are true.
What will the following expression evaluate to (true && false) || (!true)
True
False
Error
None of the mentioned
Correct Answer: B — False
Explanation:
Boolean operator && evaluates to true only when both the values are true and !true means false hence the whole expression will evaluate to false.
What will the following expression evaluate to true || false
True
False
Error
None of the mentioned
Correct Answer: A — True
Explanation:
Boolean operator || evaluates to true only when both the values are true or one is true and other is false.
What will the following expression evaluate to true && false
True
False
Error
None of the mentioned
Correct Answer: B — False
Explanation:
Boolean operator && evaluates to true only when both the values are true.
The boolean operator && only result in true when both the values are true?
True
False
Correct Answer: A — True
Explanation:
The && operator only results in true when both the values are true rest all cases it evaluates to false.
Which of the following is a valid boolean operator?
and(&&)
or(||)
not(!)
All of the mentioned
Correct Answer: D — All of the mentioned
Explanation:
We have three boolean operators which are and, or, not.
Boolean opeartors are also known as logical operators.
True
False
Correct Answer: A — True
Explanation:
Boolean operators result in boolean values like true or false.
first_name,Last_name=gets.chomp,gets.chomp is the correct way to get the input from the user.
True
False
Correct Answer: A — True
Explanation:
It will take the input from user and store its value in the specified variables.
Why is gets not preferred instead of gets.chomp?
Gets add an extra new line while chomp removes it
Gets remove an extra new line
Chomp erases the value stored in the variable
All of the mentioned
Correct Answer: A — Gets add an extra new line while chomp removes it
Explanation:
gets.chomp will remove the extra blank space.
Which sequence can be used to substitute the value of any ruby expression in a string?
#(expr)
#{expr}
#expr
None of the mentioned
Correct Answer: B — #{expr}
Explanation:
#{expr} is valid.
For getting an input from the user which method is used?
get
gets.chomp
get-s
chomp
Correct Answer: B — gets.chomp
Explanation:
The method gets.chomp takes the input from the user.
We use semicolon or parentheses after every print or puts statement.
True
False
Correct Answer: B — False
Explanation:
No semicolon or parentheses is required.
Why is the library function 'puts'used for?
Prints whatever is given and print it to the screen
Prints whatever is given and insert a new(blank) line
Gets input from the user
None of the mentioned
Correct Answer: B — Prints whatever is given and insert a new(blank) line
Explanation:
Puts is a library function which prints and then insert a new blank line.
Which of the following is not a valid library function?
Puts
Gets
Get
Correct Answer: D — Get
Explanation:
gets is used for taking input from the user.
It's a good habit to give two spaces between if statement and condition.
True
False
Correct Answer: A — True
Explanation:
Not necessary but good coders follow it.
If statement inside if statement is called Nested if statements.
True
False
Correct Answer: A — True
Explanation:
Nested if means statement inside statement.
What error does the if condition gives if not terminated with end statement?
Syntax error
Unexpected end
Expecting keyword end
All of the mentioned
Correct Answer: D — All of the mentioned
Explanation:
We will get all the three errors.
If expression. The expression can be of which type?
True
Any number
Any string
All of the mentioned
Correct Answer: D — All of the mentioned
Explanation:
The condition must be true then if statement works.
The elsif statement can add many alternatives to if/else statements.
True
False
Correct Answer: A — True
Explanation:
We can add many conditions between if/else statements using elsif conditional statement.
