Go (golang) MCQ Practice Test

Q1. In Go, what does 'for i, v := range mySlice' do?

• A. Iterates over the slice, yielding each index and value pair ✓
• B. Sorts the slice in place
• C. Reverses the slice
• D. Allocates a copy of the slice

Q2. What is the purpose of the & operator in Go?

• A. It is used for concatenating strings.
• B. It is used for creating a pointer to a variable.
• C. It is used for taking the address of a variable. ✓
• D. It is used for dereferencing a pointer.

Q3. What is the primary purpose of the 'error' return value (often assigned to a variable named 'err') when using functions from Go's built-in packages?

• A. To print error messages to the console.
• B. To handle and recover from panics.
• C. To indicate whether a function call was successful or if an error occurred. ✓
• D. To format output to the console.

Q4. What is the purpose of the "defer" keyword in Go?

• A. To specify the execution order of multiple goroutines
• B. To delay the execution of a function until the surrounding function returns ✓
• C. To specify the number of CPU cores to use for a program
• D. To handle runtime errors and panics

Q5. In Go, what is the purpose of the 'defer' statement in the following code snippet: 'defer fmt.Println('Hello World')'?

• A. To execute the function at the end of the scope ✓
• B. To execute the function at the beginning of the scope
• C. To execute the function when an error occurs
• D. To execute the function when the program ends

Q6. What is the purpose of the 'go get' command in Go?

• A. To compile the Go program
• B. To download and install a package ✓
• C. To run a Go program
• D. To build a Go program

Q7. What is the purpose of the "go get" command in Go?

• A. To compile and run a Go program
• B. To download and install a Go package ✓
• C. To run a Go program with a specific flag
• D. To build a Go package

Q8. In Go, what is the purpose of the `range` keyword in a `for` loop?

• A. To iterate over the keys of a map
• B. To iterate over the values of a map
• C. To iterate over the indices and values of an array or slice
• D. All of the above ✓

Q9. In Go, what operator is used for string concatenation?

• A. The + operator ✓
• B. The & operator
• C. The !+ operator
• D. The * operator

Q10. What is the purpose of the 'go mod init' command in Go?

• A. To create a new Go module ✓
• B. To install a specific Go package
• C. To upgrade the Go module cache
• D. To run a Go program

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