Ruby Association Certified Ruby Examination Silver Sample Questions

Q1. Which of the following have true values in Ruby? (Choose two.)

(a) ""
(b) 0
(c) false
(d) nil

Q2. Which of the following are reserved words in Ruby? (Choose two.)

(a) each
(b) rand
(c) class
(d) send
(e) true

Q3. Which variable name is valid in Ruby? (Choose one.)

(a) 3y
(b) false
(c) _9class
(e) xyz$

Q4. Which of the following can be inserted into __(1)__ in order to generate the output below? (Choose two.)

$code = "CODE"
__(1)__

[Output]
i like writing CODE

(a) puts "i like writing #{$code}"
(b) puts "i like writing #$code"
(c) puts 'i like writing #{$code}'
(d) puts 'i like writing #$code'

Q5. Given the following:

num = 025
puts num

Which is the correct output? (Choose one.)

(a) nil
(b) 025
(c) 21
(d) 25

Q6. Given the following:

x = "Hello"
y = x.empty? ? 1 : 2
p y

Which is the correct output? (Choose one.)

(a) 1
(b) 2
(c) "Hello"
(d) true

Q7. Given the following:

amount = 120

size = case amount
  when 1..120; "S"
  when 120..170; "M"
  when 170..200; "L"
  else "XL"
end

p size

(a) "S"
(b) "M"
(c) "L"
(d) "XL"

Which is the correct output? (Choose one.)

Q8. Given the following:

item = "apple"

["banana", "carrot", "daikon"].each do |item|
  puts item
end

puts item

Which is the correct result? (Choose one.)

(a) A syntax error occurs

(b) An exception is raised

(c)

banana
carrot
daikon
daikon

(d)

banana
carrot
daikon
apple

Q9. Given the following:

x = 0

4.times do |i|
  x += i
end

p x

Which is the correct result? (Choose one.)

(a) 0
(b) 4
(c) 6
(d) A syntax error occurs

Q10. Which of the following are correct to specify Windows-1252 as the encoding of the source code? (Choose all that apply.)

(a) # charset: Windows-1252
(b) # chars: Windows-1252
(c) # coding: Windows-1252
(d) # encoding: Windows-1252

Q11. Given the following:

# coding: Windows-1252

puts "hello".encoding.name

Which is the correct result? (Choose one)

(a) ASCII-8BIT
(b) UTF-8
(c) Windows-1252
(d) A syntax error occurs.

Q12. Given the following:

puts "hello".encoding.name

Which is the correct result? (Choose one.)

(a) ASCII-8BIT
(b) UTF-8
(c) Windows-1252
(d) A syntax error occurs.

Q13. Given the following:

s = "pear"

if s.empty?
  puts "blank"
elsif s.length < 5
  puts "short"
else
  puts "long"
end

Which is the correct result? (Choose one.)

(a) blank
(b) short
(c) long
(d) an exception is raised

Q14: Given the following:

s = "daikon"

if s.empty?
  puts "blank"
elsif s.length < 5
  puts "short"
else
  puts "long"
end

Which is the correct result? (Choose one.)

(a) blank
(b) short
(c) long
(d) An exception is raised.

Q15: Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose one.)

n = 42
if n < 0
  puts "a"
__(1)__ n > 0
  puts "b"
else
  puts "c"
end

[Output]
b

(a) elseif
(b) else if
(c) elif
(d) elsif

Q16. Which of the following regular expressions only match the string "Ruby" or "ruby"? (Choose two.)

(a) /\A[Rr]uby\z/
(b) /\ARuby|ruby\z/
(c) /\A[Rr][u][b][y]\z/
(d) /\AR|ruby\z/

Q17. Which of the following regular expressions has a match only when a string has at least one character, and consists of lowercase letters only? (Choose one.)

(a) /\A[a-z]*\z/
(b) /\A[a-z][a-z]*\z/
(c) /\A[a-z][^a-z]*\z/
(d) /\A[a-z][a-z].\z/

Q18.Given the following:

MSG = 42
MSG += 5
p MSG

What is the correct result? (Choose one.)

(a) 47 is displayed without warning.
(b) An error occurs because MSG is a constant.
(c) 42 is displayed because MSG is a constant.
(d) A warning appears beacuse MSG is a constant but 47 is displayed.

Q19. Given the following:

MSG = "hello"
MSG.upcase!
p MSG

What is the correct result? (Choose one.)

(a) An error occurs because MSG is a constant.
(b) HELLO is displayed without warning.
(c) A warning apears because MSG is a constant but "HELLO" is displayed
(d) hello is displayed since MSG is a constant.

Q20. Which of the following statements are true? (Choose two.):

(a) Local variables start with a lower case letter, and are two or more characters in length.
(b) Global variables start with $.
(c) Instance variables start with *.
(d) Class variables start with $.
(e) Constants start with an upper case letter.

Q21. Given the following:

x = [1,2,3,4,5,6,7,8]
y = x
x.reject! { |e| e.even? }
p x
p y

Which is the correct output? (Choose one)

(a)

[1,3,5,7]
[1,2,3,4,5,6,7,8]

(b)

[1,2,3,4,5,6,7,8]
[1,2,3,4,5,6,7,8]

(c)

[1,3,5,7]
[1,3,5,7]

(d)

[1,3,5,7]
[2,4,6,8]

Q22. Given the following:

a = [ 2, 4, 6, 8, 10 ]
a.shift
a.pop
a.push(12)
p a

(a) [2, 4, 6, 8, 10, 12]
(b) [2, 4, 6, 8, 10]
(c) [4, 6, 8, 12]
(d) [4, 6, 8]

Which is the correct output? (Choose one.)

Q23. Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose one.)

x = true
x __(1)__ exit(1)
puts("succeeded!")

[Output]
succeeded!

(a) |
(b) ||
(c) &
(d) &&

Q24. Given the following:

m = true
m or n = true
p n

Which is the correct result? (Choose one.)

(a) true
(b) false
(c) nil
(d) A syntax error occurs.

Q25. Which of the following can be inserted into (1) in order for the given code to generate the output below? (Choose two.)

x = [ 9, 7, 5, 3, 1 ]
p __(1)__

[Output]
[7, 5, 3]

(a) x[1, 3]
(b) x[1..-1]
(c) x[-3..-1]
(d) x[-4..-2]

Q26. Which of the following can be inserted into (1) in order for the given code to generate the output below? (Choose one.)

ary = [ "apple", "banana", "carrot" ]
p ary.__(1)__(",")

[Output]
"apple,banana,carrot"

(a) concat
(b) map
(c) select
(d) join

Q27. Given the following:

puts "42A7".to_i

What is the correct result? (Choose one)

(a) 42
(b) 42A7
(c) 17063
(d) An error occurs at run-time.

Q28. Which of the following methods will NOT show you if the element 'c' exists in the hash key or not? (Choose one.)

h = {"a"=>2, "b"=>4, "c"=>6, "d"=>8, "e"=>10}

(a) p h.has_key?('c')
(b) p h.contain?('c')
(c) p h.include?('c')
(d) p h.key?('c')
(e) p h.member?('c')

Q29. "Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose two.)

a = [120, 40, 20, 80, 160, 60, 180]
a.__(1)__
p a

[Output]
[120,80,160,180]

(a) reject! {|i| i < 80}
(b) slice {|i| i < 80 }
(c) slice! {|i| i < 80}
(d) delete_if! {|i| i < 80}
(e) delete_if {|i| i < 80}
(f) reject {|i| i < 80}

Q30. Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose one.)

p ["apple", "banana"] __(1)__ ["banana", "carrot"]

[Output]
["apple", "banana", "carrot"]

(a) .concat
(b) &
(c) |
(d) ||

Q31. Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose one.)

p ["apple", "banana"] __(1)__ ["banana", "carrot"]

[Output]
["banana"]

(a) |
(b) ||
(c) &&
(d) &
(e) .concat

Q32. Given the following:

class SomeError < StandardError; end
class SomeOtherError < SomeError; end

def meth1
  raise SomeOtherError.new("error")
end

begin
  meth1
rescue SomeError
  print "SomeError"
rescue SomeOtherError
  print "SomeOtherError"
end

What is the correct result? (Choose one.)

(a) A syntax error
(b) SomeError
(c) SomeErrorSomeOtherError
(d) SomeOtherError

Q33. Given the following:

begin
  ans = 100/0
  puts ans
rescue ZeroDivisionError
  puts "Error: ZeroDivisionError"
  exit 1
ensure
  puts "DONE!"
end

Which is the correct output? (Choose one.)

(a)

0
DONE!

(b)

Error: ZeroDivisionError

(c)

Error: ZeroDivisionError
DONE!

(d)

Error: ZeroDivisionError
0

Q34. Which of the following statements appropriately applies to class in Ruby? (Choose one.)

For a class which does not explicitly specify a superclass:

(a) an UndefinedParentClassError exception is raised
(b) a syntax error occurs
(c) the Module class becomes the superclass.
(d) the class is created without a superclass.
(e) the Object class becomes the superclass.

Q35. Given the following:

class Object
  def moo
    puts "MOO!"
  end
end

"Cow".moo

What is the correct result? (Choose one.)

(a) No output.
(b) An error occurs at run-time.
(c) "MOO!"
(d) nil

Q36. Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose one.)

class Shouter
  def __(1)__(message)
    @message = message
  end

  def greet
    puts @message.upcase
  end
end

g = Shouter.new("Hello, world!")
g.greet

[Output]
HELLO, WORLD!

(a) Shouter
(b) new
(c) initialize
(d) __init__

Q37. Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose one.)

class Shouter
  def initialize(message)
    @message = message
  end

  def greet
    puts @message.upcase
  end
end

g = __(1)__("Hello, world!")
g.greet

[Output]
HELLO, WORLD!

(a) Shouter
(b) #Shouter
(c) new Shouter
(d) Shouter.new

Q38. Given the following:

class Foo
  attr_reader :var
  def initialize
    @var = "apple"
  end
end

class Bar < Foo
  def initialize
    @var = "banana"
    super
  end
end

bar = Bar.new
puts bar.var

What is the correct result? (Choose one.)

(a) apple
(b) banana
(c) No output.
(d) An error occurs at run-time.

Q39. Given the following:

ary = [4,2,8,4,2,8,4,2,8]
ary.delete(8)
p ary

Which is the correct output? (Choose one.)

(a) [4, 2, 8, 4, 2, 8, 4, 2]
(b) [4, 2, 8, 4, 2, 8, 4, 2, 8]
(c) [4, 2, 4, 2, 4, 2]
(d) [8]

Q40. Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose one.)

r = "a".."e"
p r.__(1)__

[Output]
["a", "b", "c", "d", "e"]

Which is the correct output? (Choose one.)

(a) array
(b) to_ary
(c) to_a
(d) to_array

Q41. Given the following:

p [0,1,2,3,4,5].find {|x| x < 3}

Which is the correct output? (Choose one.)

(a) [0, 1, 2]
(b) 0
(c) [0, 1, 2, 3]
(d) true

Q42. Which of the following can be inserted into __(1)__ in order for the given code to generate the output below? (Choose two.)

p [1,16,8,4,2].__(1)__

[Output]
[16, 8, 4, 2, 1]

(a) sort_by { |x| -x }
(b) sort_reverse
(c) sort.reverse
(d) reverse.sort

Q43. Which of the following can be inserted into (1) in order for the given code to sort an array in descending order? (Choose one.)

ary = [2,4,8,1,16]
p ary.__(1)__

[Output]
[16, 8, 4, 2, 1]

(a) sort { |i,j| -i <= -j }
(b) sort { |i,j| -i <=> -j }
(c) sort { |i,j| i >= j }
(d) sort{ |i,j| i <=> j }

Q44. Given the following:

file = File.new("test")
file.seek(5)
print file.gets

[Contents of file test]
hellorubyworld

Which is the correct output? (Choose one.)

(a) hello
(b) rubyworld
(c) hellor
(d) rubyw
(e) orubyworld

Q45. The code below was used to open a file omitting the second argument of the open method. In this case, which of the following is implicitly specified? (Choose one.)

file = open("sample.txt")

(a) r
(b) r+
(c) a
(d) a+
(e) w
(f) w+

Q46: Which of the following can be inserted into __(1)__ in order for the given code to copy the content of file "test_one.txt" to file "test_two.txt"?

In the case that the “test_two.txt” file already exist, this code should set first the file size to zero and then overwrites its content from the beginning. (Choose two.)

open("test_one.txt") {|source|
  open("test_two.txt", "__(1)__") {|dest|
    dest.write(source.read)
  }
}

(a) r+
(b) a
(c) a+
(d) w
(e) w+

Q47: Which class methods do NOT belong to Dir class? (Choose two.)

(a) Dir.pwd
(b) Dir.rename
(c) Dir.basename
(d) Dir.chdir
(e) Dir.delete

Q48. Given the following:

p "hello ruby world"[6,4]

What is the correct result? (Choose one.)

(a) "hello "
(b) "ruby"
(c) " world"
(d) An error occurs at run-time.

Q49:

Given the following:

str = "bat"
str[1,1] = "o"
p str

Which is the correct output? (Choose one.)

(a) "boo"
(b) "bot"
(c) "oat"
(d) "o"

Q50. Given the following:

puts 5 * "hi"

What is the correct result? (Choose one.)

(a) "hihihihihi"
(b) An error occurs at run-time.
(c) "5hi"
(d) "5*hi"

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Ruby Association Certified Ruby Examination Silver Sample Questions