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Blog Quizzes Top 70 Golang MCQs (Quiz) With Answers

Top 70 Golang MCQs (Quiz) With Answers

By: Sanjay Prajapat

Last Updated: March 25th, 2026

Read Time: 30:00 Minutes

1. Master Golang Programming with Our Golang Tutorial

2. Top Golang MCQs

3. Your Quiz Result

Preparing for your next Golang interview? Well, then this Golang MCQ list is a go-to source for you. It includes the most asked Golang multiple-choice interview questions. These will help you test your proficiency and skills as well as find the weak areas.

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Top Golang MCQs

1. What is the role of the "init" function in Go?

A) To handle errors
B) To perform setup tasks for a package
C) To define constants
D) To start goroutines

2. How do you implement concurrency in Go?

A) Using threads
B) Using processes
C) Using goroutines and channels
D) Using locks

3. Which of the following is not a basic data type in Go?

A) int
B) float64
C) array
D) bool

4. How do you declare a constant in Go?

A) var MY_CONST = 10
B) const MY_CONST = 10
C) static MY_CONST = 10
D) #define MY_CONST 10

5. Which keyword is used to create a goroutine?

A) start
B) run
C) thread
D) go

6. What is the purpose of channels in Go?

A) To manage memory
B) To communicate between goroutines
C) To define interfaces
D) To handle errors

7. Which of the following is not a feature of Go?

A) Concurrency with goroutines
B) Static typing
C) Garbage collection
D) Classical inheritance

8. How do you implement an interface in Go?

A) Using the implements keyword
B) By defining all methods of the interface
C) Using the extends keyword
D) By declaring the interface explicitly

9. What is the default value of a boolean variable in Go?

A) true
B) 0
C) false
D) nil

10. What is the zero value of a slice in Go?

A) empty
B) nil
C) []
D) 0

11. Which keyword is used to defer the execution of a function until the surrounding function returns?

A) delay
B) wait
C) defer
D) postpone

12. What does the "make" function do in Go?

A) Creates a new package
B) Initializes slices, maps, and channels
C) Declares variables
D) Compiles the program

13. How do you declare a struct in Go?

A) class MyStruct {}
B) struct MyStruct;
C) type MyStruct struct {}
D) define MyStruct struct {}

14. What is the output of fmt.Println(10 / 3)?

A) 3.33
B) 3
C) 3.0
D) Error

15. Which of the following is a valid comment in Go?

A) // This is a comment
B) # This is a comment
C) /* This is a comment
D) -- This is a comment

16. What is the purpose of the "panic" function in Go?

A) To handle exceptions gracefully
B) To stop execution and start recovery
C) To defer function execution
D) To create goroutines

17. How do you recover from a panic in Go?

A) Using try-catch
B) Using defer-panic
C) Using recover()
D) Using catch()

18. What is a slice in Go?

A) A fixed-size array
B) A key-value data structure
C) A dynamic view of an array
D) A pointer to a struct

19. Which package is used for input/output operations in Go?

A) fmt
B) os
C) io
D) net

20. What is the zero value of a pointer in Go?

A) 0
B) null
C) false
D) nil

21. What is the purpose of the "range" keyword in a for loop?

A) To define loop boundaries
B) To iterate over elements of a collection
C) To break the loop
D) To skip iterations

22. Which collection allows unique elements without maintaining insertion order?

A) slice
B) map
C) map with struct{} values
D) array

23. How do you define a method for a struct in Go?

A) func (s *Struct) Method() {}
B) func Struct.Method() {}
C) func (s Struct) Method() {}
D) method Struct.func() {}

24. Which of the following is not a valid loop construct in Go?

A) for loop
B) for range loop
C) while loop
D) do-while loop

25. What is the purpose of the "break" statement in Go?

A) Skip the current iteration
B) Terminate the loop or switch
C) Exit the program
D) Restart the loop

26. What is the zero value of a map in Go?

A) {}
B) empty
C) nil
D) 0

27. What is the maximum value of an int32 in Go?

A) 2^15 - 1
B) 2^31 - 1
C) 2^32 - 1
D) 2^63 - 1

28. Which of the following is true about strings in Go?

A) Strings are mutable
B) Strings are stored as arrays
C) Strings are pointers
D) Strings are immutable

29. What does the "go" command do?

A) Compiles and runs a program
B) Manages dependencies and builds programs
C) Formats code
D) Creates new packages

30. Which of the following is used to handle errors in Go?

A) try-catch
B) throw
C) error type
D) exception

31. What is the output of fmt.Println(5 + 'A')?

A) 5A
B) Error
C) 70
D) A5

32. Which interface must be implemented for custom sorting in Go?

A) fmt.Stringer
B) sort.Interface
C) io.Reader
D) error

33. What is the primary benefit of using a slice over an array in Go?

A) Faster access time
B) Fixed size
C) Dynamic resizing
D) Type safety

34. Which keyword is used to import a package in Go?

A) include
B) require
C) import
D) use

35. What is the purpose of the "iota" identifier in Go?

A) To define variables
B) To create enumerated constants
C) To handle errors
D) To initialize slices

36. Which of the following is true about Go interfaces?

A) They require explicit implementation
B) They can contain fields
C) They support inheritance
D) They are implicitly implemented

37. What is garbage collection in Go?

A) Manual memory management
B) Automatic memory management for unused objects
C) Code optimization
D) Data backup

38. Which package contains the "fmt" functions for formatting and printing?

A) fmt
B) io
C) os
D) log

39. What is the purpose of the "select" statement in Go?

A) To define conditions
B) To iterate over slices
C) To handle multiple channel operations
D) To switch between functions

40. Which of the following is true about Go modules?

A) They are used for concurrency
B) They replace interfaces
C) They are optional for small projects
D) They manage dependencies

41. What is the purpose of the "type" keyword in Go?

A) To declare variables
B) To define new types
C) To import packages
D) To handle errors

42. Which package is used for reading input from the console in Go?

A) io
B) os
C) fmt
D) bufio

43. What does the "interface{}" type represent in Go?

A) A specific struct type
B) Any type
C) A pointer type
D) A constant type

44. Which data structure is used for key-value pairs in Go?

A) slice
B) array
C) map
D) struct

45. What is the purpose of the "append" function in Go?

A) To add elements to a slice
B) To create a new array
C) To modify a map
D) To initialize a channel

46. What happens when you read from an unbuffered channel with no data?

A) Returns nil
B) Blocks until data is available
C) Panics
D) Returns zero value

47. What is the purpose of the "struct" type in Go?

A) To define loops
B) To create interfaces
C) To group related fields
D) To manage concurrency

48. Which statement is used to handle multiple cases in Go?

A) if
B) for
C) switch
D) select

49. What is the purpose of the "runtime" package in Go?

A) To format strings
B) To interact with the Go runtime system
C) To handle HTTP requests
D) To manage files

50. What is the zero value of a struct in Go?

A) nil
B) empty struct
C) Zero values for all fields
D) undefined

51. How do you start a goroutine in Go?

A) run func()
B) start func()
C) go func()
D) thread func()

52. What is the purpose of the "sync" package in Go?

A) To format output
B) To provide synchronization primitives
C) To manage files
D) To handle HTTP servers

53. Which of the following is true about Go’s error handling?

A) Uses try-catch blocks
B) Relies on exceptions
C) Uses panic exclusively
D) Returns errors as values

54. What is the default value of a string in Go?

A) ""
B) nil
C) null
D) 0

55. Which package provides HTTP server functionality in Go?

A) http
B) net/http
C) io/http
D) web

56. What is the output of fmt.Println("Hello"[1:4])?

A) Hell
B) ello
C) ell
D) Hel

57. Which of the following is true about Go’s type system?

A) Supports dynamic typing
B) Allows multiple inheritance
C) Uses classes for structs
D) Is statically typed

58. How do you explicitly trigger a panic in Go?

A) throw
B) panic
C) error
D) raise

59. What is the purpose of the "len" function in Go?

A) To return the length of a collection
B) To initialize a slice
C) To create a channel
D) To format strings

60. Which of the following is a valid function signature in Go?

A) func name() {}
B) func name() return int {}
C) func name() int {}
D) func name(int) {}

61. What is the output of fmt.Println(10 + 20 + "30")?

A) 60
B) Error
C) 3030
D) 102030

62. Which package contains the "errors" package for error handling?

A) fmt
B) io
C) os
D) errors

63. What is the purpose of the "cap" function in Go?

A) To return the capacity of a slice or channel
B) To initialize a map
C) To close a channel
D) To format strings

64. Which function is used to copy elements between slices in Go?

A) move()
B) transfer()
C) copy()
D) clone()

65. What is the purpose of the "context" package in Go?

A) To format output
B) To manage request-scoped data and cancellation
C) To handle file operations
D) To create goroutines

66. Which collection maintains insertion order in Go?

A) map
B) array
C) struct
D) slice

67. What is the purpose of the "new" function in Go?

A) To allocate memory for a pointer
B) To create a slice
C) To initialize a map
D) To define a struct

68. What happens when you access an uninitialized map in Go?

A) Returns zero value
B) Returns nil
C) Panics
D) Creates an empty map

69. Which keyword is used to define a named constant group in Go?

A) var
B) const
C) type
D) enum

70. What is the purpose of the "String()" method in Go?

A) To convert a string to an integer
B) To compare strings
C) To format numbers
D) To provide a string representation of a type

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About the Author

Sanjay Prajapat

Sanjay Prajapat is a Data Engineer and technology writer with expertise in Python, SQL, data visualization, and machine learning. He simplifies complex concepts into engaging content, helping beginners and professionals learn effectively while exploring emerging fields like AI, ML, and cybersecurity in today’s evolving tech landscape.

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