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Julia MCQs and Answers with Explanation: Are you going to appear for an interview or certificate examination on Julia programming language? then you should have a look at these Julia Multiple Choice Questions to be able to perform well in the interview or exam. Julia is a high-level, dynamic programming language designed to address the needs of high-performance numerical and scientific computing, data analysis, and machine learning. It was developed in 2012 and has quickly gained popularity among data scientists, engineers, and researchers due to its ease of use, speed, and scalability. Julia is an open-source language that is easy to learn, and it has a rich ecosystem of packages that extend its functionality. Now, know more about Julia through these Julia MCQ Questions/ Julia programming language Quiz along with an explanation that we have accommodated in the following section.
Julia MCQs and Answers
This article provides a collection of Julia Multiple Choice Questions (MCQs) with answers to help you assess your knowledge and understanding of the language. Whether you are a beginner or an experienced programmer, these Julia programming language MCQs with Answers will help you sharpen your Julia skills and become more proficient in this powerful language.
Julia Multiple Choice Questions
| Name | Julia |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 47 Julia MCQs with Answers | Julia Programming Language Quiz
1. What is Julia programming language?
a) A high-level programming language for numerical and scientific computing
b) A low-level programming language for system programming
c) A web development framework
d) A markup language for creating web pages
Answer: a) A high-level programming language for numerical and scientific computing.
Explanation: Julia is a high-level, high-performance programming language designed specifically for numerical and scientific computing, data science, and machine learning.
2. Who created Julia programming language?
a) Guido van Rossum
b) James Gosling
c) Jeff Bezanson, Stefan Karpinski, and Viral B. Shah
d) Brendan Eich
Answer: c) Jeff Bezanson, Stefan Karpinski, and Viral B. Shah.
Explanation: Julia programming language was created by Jeff Bezanson, Stefan Karpinski, and Viral B. Shah in 2012.
3. What is the file extension for a Julia program?
a) .jl
b) .py
c) .java
d) .js
Answer: a) .jl.
Explanation: The file extension for a Julia program is .jl, for example, hello.jl.
4. What is the command to run a Julia program in the terminal?
a) run julia hello.jl
b) julia hello.jl
c) execute hello.jl
d) run hello.jl
Answer: b) julia hello.jl.
Explanation: To run a Julia program in the terminal, you need to type “julia” followed by the name of the Julia program file, for example, “julia hello.jl”.
5. What is the syntax for declaring a variable in Julia?
a) var x = 10
b) x = 10
c) int x = 10
d) declare x = 10
Answer: b) x = 10.
Explanation: In Julia, variables are declared by simply assigning a value to them, for example, “x = 10”.
6. What is the syntax for a single-line comment in Julia?
a) // This is a comment
b) # This is a comment
c) /* This is a comment */
d) <!– This is a comment –>
Answer: b) # This is a comment.
Explanation: In Julia, a single-line comment is denoted by the “#” symbol.
7. What is the syntax for a multi-line comment in Julia?
a) // This is a multi-line comment
b) # This is a multi-line comment #
c) /* This is a multi-line comment */
d) <!– This is a multi-line comment –>
Answer: c) /* This is a multi-line comment */.
Explanation: In Julia, a multi-line comment is denoted by the “/” and “/” symbols.
8. What is the syntax for a while loop in Julia?
a) while x < 10 do
# code here
end
b) while x < 10 {
# code here
}
c) while x < 10:
# code here
d) while x < 10
# code here
end
Answer: a) while x < 10 do … end.
Explanation: In Julia, a while loop is written as “while condition do … end”.
9. What is the syntax for a function in Julia?
a) function my_function(arg1, arg2)
# code here
end
b) def my_function(arg1, arg2):
# code here
c) void my_function(arg1, arg2) {
# code here
}
d) sub my_function(arg1, arg2) {
# code here
}
Answer: a) function my_function(arg1, arg2) … end.
Explanation: In Julia, a function is written as “function function_name(arguments) … end”.
10. What is the output of the following Julia code?
x = 5
y = 2
println(x + y)
a) 3
b) 7
c) 52
d) 25
Answer: b) 7.
Explanation: The code declares two variables, “x” and “y”, and then prints their sum using the “println” function.
11. What is the output of the following Julia code?
x = 5
y = “Hello”
println(“$y, the value of x is $x.”)
a) Hello, the value of x is 5.
b) Hello, the value of x is $x.
c) $y, the value of x is 5.
d) $y, the value of x is $x.
Answer: a) Hello, the value of x is 5.
Explanation: The code uses string interpolation to insert the values of the variables “x” and “y” into the string that is printed.
12. What is the output of the following Julia code?
x = 5
if x < 10
println(“x is less than 10”)
elseif x == 10
println(“x is equal to 10”)
else
println(“x is greater than 10”)
end
a) x is less than 10
b) x is equal to 10
c) x is greater than 10
d) No output
Answer: a) x is less than 10.
Explanation: The code uses an if-elseif-else statement to check the value of the variable “x” and print a corresponding message.
13. What is the output of the following Julia code?
x = 1
while x <= 10
println(x)
x += 1
end
a) 1 2 3 4 5 6 7 8 9 10
b) 10 9 8 7 6 5 4 3 2 1
c) 1 3 5 7 9
d) No output
Answer: a) 1 2 3 4 5 6 7 8 9 10.
Explanation: The code uses a while loop to print the numbers from 1 to 10.
14. What is the output of the following Julia code?
function my_function(x)
return x * 2
end
y = my_function(5)
println(y)
a) 2
b) 5
c) 10
d) 25
Answer: c) 10.
Explanation: The code defines a function called “my_function” that takes one argument and returns its value multiplied by 2. The function is then called with an argument of 5, and the result is stored in a variable called “y” and printed.
15. What is the output of the following Julia code?
function my_function(x)
println(“The value of x is $x.”)
end
my_function(5)
a) The value of x is 5.
b) The value of x is $x.
c) 5
d) No output
Answer: a) The value of x is 5.
Explanation: The code defines a function called “my_function” that takes one argument and prints a message using string interpolation. The function is then called with an argument of 5, which is inserted into the message and printed.
16. What is the output of the following Julia code?
function my_function(x = 1, y = 2)
println(“x = $x, y = $y”)
end
my_function()
my_function(3)
my_function(3, 4)
a) x = 1, y = 2
x = 3, y = 2
x = 3, y = 4
b) x = 1, y = 2
x = 2, y = 3
x = 3, y = 4
c) x = 1, y = 2
x = 3, y = 4
x = 4, y = 5
d) No output
Answer: a) x = 1, y = 2
x = 3, y = 2
x = 3, y = 4.
Explanation: The code defines a function called “my_function” that takes two arguments with default values of 1 and 2. The function is then called three times with different argument combinations, and the values of the arguments are printed using string interpolation.
17. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
println(a[3])
a) 3
b) 4
c) [3]
d) [4]
Answer: a) 3.
Explanation: The code declares an array “a” containing the values 1 through 5, and then prints the third element of the array, which is 3.
18. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = a[2:4]
println(b)
a) [1, 2, 3, 4, 5]
b) [2, 3, 4]
c) [2, 4]
d) [3, 4, 5]
Answer: b) [2, 3, 4].
Explanation: The code declares an array “a” containing the values 1 through 5, and then creates a new array “b” containing the elements of “a” from the second through the fourth index. The array “b” is then printed.
19. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = push!(a, 6)
println(b)
a) [1, 2, 3, 4, 5, 6]
b) [1, 2, 3, 4, 5]
c) 6
d) No output
Answer: a) [1, 2, 3, 4, 5, 6].
Explanation: The code declares an array “a” containing the values 1 through 5, and then appends the value 6 to the end of the array using the push!() function. The resulting array, which now contains the values 1 through 6, is then printed.
20. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = pop!(a)
println(b)
a) [1, 2, 3, 4]
b) [5]
c) 4
d) No output
Answer: c) 5.
Explanation: The code declares an array “a” containing the values 1 through 5, and then removes the last element of the array using the pop!() function, which returns the removed element. The value of the removed element, which is 5, is then printed.
21. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = reverse(a)
println(b)
a) [1, 2, 3, 4, 5]
b) [5, 4, 3, 2, 1]
c) [5, 1]
d) No output
Answer: b) [5, 4, 3, 2, 1].
Explanation: The code declares an array “a” containing the values 1 through 5, and then creates a new array “b” containing the elements of “a” in reverse order using the reverse() function. The resulting array “b” is then printed.
22. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = sum(a)
println(b)
a) 1
b) 15
c) [1, 2, 3, 4, 5]
d) No output
Answer: b) 15.
Explanation: The code declares an array “a” containing the values 1 through 5, and then computes the sum of the elements in the array using the sum() function. The resulting sum, which is 15, is then printed.
23. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = map(x -> x * 2, a)
println(b)
a) [1, 2, 3, 4, 5]
b) [2, 4, 6, 8, 10]
c) [1, 4, 9, 16, 25]
d) No output
Answer: b) [2, 4, 6, 8, 10].
Explanation: The code declares an array “a” containing the values 1 through 5, and then creates a new array “b” containing the elements of “a” multiplied by 2 using the map() function with an anonymous function. The resulting array “b” is then printed.
24. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = filter(x -> x % 2 == 0, a)
println(b)
a) [1, 2, 3, 4, 5]
b) [2, 4]
c) [1, 3, 5]
d) No output
Answer: b) [2, 4].
Explanation: The code declares an array “a” containing the values 1 through 5, and then creates a new array “b” containing only the even elements of “a” using the filter() function with an anonymous function that checks for evenness. The resulting array “b” is then printed.
25. What is the output of the following Julia code?
function myfunc(x)
return x + 1
end
a = [1, 2, 3, 4, 5]
b = map(myfunc, a)
println(b)
a) [1, 2, 3, 4, 5]
b) [2, 3, 4, 5, 6]
c) [1, 4, 9, 16, 25]
d) No output
Answer: b) [2, 3, 4, 5, 6].
Explanation: The code declares a function “myfunc” that takes a single argument and returns the argument plus 1. It then declares an array “a” containing the values 1 through 5, and creates a new array “b” containing the elements of “a” with 1 added to each element using the map() function with the “myfunc” function as an argument. The resulting array “b” is then printed.
26. What is the output of the following Julia code?
function myfunc(x)
if x % 2 == 0
return true
else
return false
end
end
a = [1, 2, 3, 4, 5]
b = filter(myfunc, a)
println(b)
a) [1, 2, 3, 4, 5]
b) [2, 4]
c) [1, 3, 5]
d) No output
Answer: b) [2, 4].
Explanation: The code declares a function “myfunc” that takes a single argument and returns true if the argument is even, and false otherwise. It then declares an array “a” containing the values 1 through 5, and creates a new array “b” containing only the even elements of “a” using the filter() function with the “myfunc” function as an argument. The resulting array “b” is then printed.
27. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = popfirst!(a)
println(b)
a) [1, 2, 3, 4, 5]
b) [2, 3, 4, 5]
c) [1, 2, 3, 4]
d) 1
Answer: d) 1.
Explanation: The code declares an array “a” containing the values 1 through 5, and then removes the first element of “a” using the popfirst!() function. The removed element (which is the return value of popfirst!()) is then printed.
28. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = insert!(a, 3, 2.5)
println(b)
a) [1, 2, 3, 4, 5]
b) [1, 2, 2.5, 3, 4, 5]
c) [2, 2.5, 3, 4, 5]
d) [1, 2.5, 3, 4, 5]
Answer: b) [1, 2, 2.5, 3, 4, 5].
Explanation: The code declares an array “a” containing the values 1 through 5, and then inserts the value 2.5 at the 3rd position of “a” using the insert!() function. The resulting array “a” (which is the return value of insert!()) is then printed.
29. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = sort(a, rev=true)
println(b)
a) [5, 4, 3, 2, 1]
b) [1, 2, 3, 4, 5]
c) [1, 5, 4, 3, 2]
d) [5, 1, 4, 2, 3]
Answer: a) [5, 4, 3, 2, 1].
Explanation: The code declares an array “a” containing the values 1 through 5, and then sorts the array in reverse order using the sort() function with the optional argument rev=true. The resulting sorted array “b” is then printed.
30. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = length(a)
println(b)
a) [1, 2, 3, 4, 5]
b) 5
c) [5, 4, 3, 2, 1]
d) [1, 3, 5]
Answer: b) 5.
Explanation: The code declares an array “a” containing the values 1 through 5, and then calculates the length of the array using the length() function. The resulting length of the array “a” is then printed.
31. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = maximum(a)
println(b)
a) [1, 2, 3, 4, 5]
b) 5
c) [5, 4, 3, 2, 1]
d) [1, 3, 5]
Answer: b) 5.
Explanation: The code declares an array “a” containing the values 1 through 5, and then finds the maximum value of the array using the maximum() function. The resulting maximum value of the array “a” is then printed.
32. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = minimum(a)
println(b)
a) [1, 2, 3, 4, 5]
b) 1
c) [5, 4, 3, 2, 1]
d) [1, 3, 5]
Answer: b) 1.
Explanation: The code declares an array “a” containing the values 1 through 5, and then finds the minimum value of the array using the minimum() function. The resulting minimum value of the array “a” is then printed.
33. What is the output of the following Julia code?
a = 5
b = “Julia”
println(“$b is version $a”)
a) “Julia is version 5
b) “5 is version Julia”
c) “Juliais version5”
d) “Version 5 is Julia”
Answer: a) “Julia is version 5”.
Explanation: The code declares a variable “a” with a value of 5, a variable “b” with a value of “Julia”, and then prints a string that interpolates the values of these variables using the $ sign. The resulting string is “Julia is version 5”.
34. What is the output of the following Julia code?
a = 5
b = “Julia”
c = a + b
a) “Julia5”
b) “Julia+a”
c) an error occurs
d) “5Julia”
Answer: c) an error occurs.
Explanation: The code declares a variable “a” with a value of 5, a variable “b” with a value of “Julia”, and then tries to add them together using the “+” operator. However, the “+” operator is not defined for adding an integer and a string in Julia, so an error occurs.
35. What is the output of the following Julia code?
function myfunc(a, b)
c = a * b
return c
end
result = myfunc(5, 3)
println(result)
a) 15
b) 8
c) an error occurs
d) 53
Answer: a) 15.
Explanation: The code defines a function called “myfunc” that takes two arguments “a” and “b”, multiplies them together, assigns the result to a variable “c”, and then returns “c”. The function is then called with arguments 5 and 3, and the resulting value is assigned to a variable “result” which is then printed. The resulting output is 15.
36. Which of the following is not a valid way to declare a string in Julia?
a) “This is a string”
b) “””This is also a string”””
c) ‘This is not a string’
d) string(“This”, ” is also a”, ” string”)
Answer: c) ‘This is not a string’
Explanation: In Julia, strings can be declared using double quotes (“…”), triple double quotes (“””…”””), or the string function (string(…)). However, single quotes are not used to declare strings in Julia. Single quotes are used to declare characters, which are not the same as strings.
37. What is the output of the following Julia code?
a = 10
b = a > 5 ? “greater than 5” : “less than or equal to 5”
println(b)
a) greater than 5
b) less than or equal to 5
c) an error occurs
d) 10
Answer: a) greater than 5.
Explanation: The code declares a variable “a” with a value of 10, and then uses a ternary operator to check whether “a” is greater than 5. If “a” is greater than 5, the string “greater than 5” is assigned to a variable “b”. Otherwise, the string “less than or equal to 5” is assigned to “b”. The resulting value of “b” is then printed, which is “greater than 5” because 10 is greater than 5.
38. What is the output of the following Julia code?
function myfunc(a, b=10)
c = a * b
return c
end
result1 = myfunc(5)
result2 = myfunc(5, 3)
println(result1)
println(result2)
a) 50 15
b) 50 10
c) an error occurs
d) 15 50
Answer: a) 50 15.
Explanation: The code defines a function called “myfunc” that takes two arguments, “a” and “b” (which has a default value of 10 if not provided). The function multiplies “a” and “b” together, assigns the result to a variable “c”, and then returns “c”. The function is then called twice, first with only one argument (5), and then with two arguments (5 and 3). The resulting values are assigned to variables “result1” and “result2”, which are then printed. The output is 50 for “result1” (since “b” defaults to 10) and 15 for “result2” (since “b” is explicitly set to 3).
39. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = map(x -> x^2, a)
println(b)
a) [1, 2, 3, 4, 5]
b) [1, 4, 9, 16, 25]
c) [1, 8, 27, 64, 125]
d) an error occurs
Answer: b) [1, 4, 9, 16, 25].
Explanation: The code declares an array “a” containing the values 1 through 5, and then applies the “map” function to “a” using a lambda function that squares each element. The resulting array ”
b” is then printed, which contains the squared values of “a”: [1, 4, 9, 16, 25].
40. What is the output of the following Julia code?
function myfunc(a)
b = a * 2
println(b)
end
c = 10
myfunc(c)
a) 10
b) 20
c) an error occurs
d) nothing
Answer: b) 20.
Explanation: The code defines a function called “myfunc” that takes one argument “a”. The function multiplies “a” by 2, assigns the result to a variable “b”, and then prints “b”. The code then declares a variable “c” with a value of 10, and calls the “myfunc” function with “c” as the argument. The function is passed the value of “c”, which is 10, and then prints 20 (since 10 * 2 = 20).
41. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = [6, 7, 8, 9, 10]
c = a .+ b
println(c)
a) [7, 9, 11, 13, 15]
b) [1, 2, 3, 4, 5]
c) [6, 7, 8, 9, 10]
d) an error occurs
Answer: a) [7, 9, 11, 13, 15].
Explanation: The code declares two arrays “a” and “b” containing the values 1 through 5 and 6 through 10, respectively. The code then uses the element-wise addition operator “.” to add each element of “a” to the corresponding element of “b”, and assigns the resulting array to “c”. The resulting value of “c” is then printed, which contains the element-wise sum of “a” and “b”: [1 + 6, 2 + 7, 3 + 8, 4 + 9, 5 + 10] = [7, 9, 11, 13, 15].
42. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = [6, 7, 8, 9, 10]
c = a .* b
println(c)
a) [6, 14, 24, 36, 50]
b) [1, 2, 3, 4, 5]
c) [6, 7, 8, 9, 10]
d) an error occurs
Answer: a) [6, 14, 24,
43. What is the output of the following Julia code?
a = [1, 2, 3, 4, 5]
b = [6, 7, 8, 9, 10]
c = a .> b
println(c)
a) [false, false, false, false, false]
b) [true, true, true, true, true]
c) [false, false, true, true, true]
d) an error occurs
Answer: a) [false, false, false, false, false].
Explanation: The code declares two arrays “a” and “b” containing the values 1 through 5 and 6 through 10, respectively. The code then uses the element-wise comparison operator “.>” to compare each element of “a” with the corresponding element of “b”, and assigns the resulting array to “c”. The resulting value of “c” is then printed, which contains a boolean value of false for each element, since each element of “a” is less than or equal to the corresponding element of “b”.
44. What is the output of the following Julia code?
a = Dict(“apple” => 1, “banana” => 2, “orange” => 3)
println(a[“banana”])
a) 1
b) 2
c) 3
d) an error occurs
Answer: b) 2.
Explanation: The code declares a dictionary “a” containing key-value pairs where “apple” maps to 1, “banana” maps to 2, and “orange” maps to 3. The code then uses the key “banana” to retrieve the corresponding value from the dictionary and prints it, which outputs 2.
45. What is the output of the following Julia code?
a = Dict(“apple” => 1, “banana” => 2, “orange” => 3)
a[“pear”] = 4
println(a)
a) Dict(“apple” => 1, “banana” => 2, “orange” => 3, “pear” => 4)
b) Dict(“apple” => 1, “banana” => 2, “orange” => 3)
c) Dict(“pear” => 4)
d) an error occurs
Answer: a) Dict(“apple” => 1, “banana” => 2, “orange” => 3, “pear” => 4).
Explanation: The code declares a dictionary “a” containing key-value pairs where “apple” maps to 1, “banana” maps to 2, and “orange” maps to 3. The code then adds a new key-value pair “pear” maps to 4 to the dictionary using the syntax a[“pear”] = 4. The resulting value of “a” is then printed, which contains all four key-value pairs: “apple” maps to 1, “banana” maps to 2, “orange” maps to 3, and “pear” maps to 4.
46. What is the output of the following Julia code?
function f(x)
x * 2
end
println(f(3))
a) 6
b) 9
c) an error occurs
d) nothing
Answer: a) 6.
Explanation: The code defines a function “f” that takes a single argument “x” and multiplies it by 2. The function is then called with an argument of 3, and the resulting value of 6 is printed using the println function.
47. What is the output of the following Julia code?
function f(x, y)
x * y
end
println(f(3, 4))
a) 7
b) 12
c) 34
d) an error occurs
Answer: b) 12.
Explanation: The code defines a function “f” that takes two arguments “x” and “y” and multiplies them together. The function is then called with arguments of 3 and 4, and the resulting value of 12 is printed using the println function.
This article presents a valuable resource for anyone looking to improve their understanding and skills in the versatile programming language of Julia. The Julia MCQs and answers provided here offer a useful way to practice and build confidence and proficiency in using Julia for various applications, including numerical computing, data analysis, and machine learning. Keep exploring our Freshersnow website to learn more and discover the full potential of this exciting language.