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GoLang Proficiency Evaluation: Core Concepts & Application Mastery

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1.What is the output of the following Go code snippet when executed? \npackage main\nimport \"fmt\"\nfunc main() {\nvar x int = 42\nif x := 10; x < 20 {\nfmt.Println(x * 2)\n} else {\nfmt.Println(x)\n}\n}
  • 1.20 ✓
  • 2.42
  • 3.20
  • 4.Compiling error
2.Which Go features ensure efficient memory management and garbage collection?
  • 1.Manual memory management
  • 2.Automatic garbage collection
  • 3.Pointer arithmetic
  • 4.Compile-time type checking
3.In Go, what is the purpose of a goroutine?
  • 1.To run functions concurrently ✓
  • 2.To manage memory resources
  • 3.To provide interface implementations
  • 4.To compile Go code
4.When would you use a buffered channel in Go?
  • 1.To prevent data races
  • 2.When you need to control the timing of the sender/receiver operations ✓
  • 3.To execute functions in parallel
  • 4.When you need high-frequency data updates
5.How does the Go scheduler optimize goroutine execution?
  • 1.By using priority levels
  • 2.By binding goroutines to specific CPUs
  • 3.Through preemption and fairness techniques
  • 4.By using non-blocking asynchronous operations ✓
6.What is the primary difference between a slice and an array in Go?
  • 1.Slices can hold different data types, arrays cannot
  • 2.Arrays are resizable, slices are not
  • 3.Slices are dynamically-sized, arrays have a fixed size ✓
  • 4.Arrays can be passed by reference, slices by value
7.Which statement is true about Go interfaces?
  • 1.They cannot contain methods
  • 2.A type can implement part of an interface and still be considered as implementing the whole interface
  • 3.Interfaces can store any type of value using dynamic typing
  • 4.A type implements an interface by implementing its methods ✓
8.What is a common pitfall when using maps in Go that can lead to runtime errors?
  • 1.Accessing a map value using an int index instead of a string
  • 2.Assigning a map to another map without copying it
  • 3.Concurrent writing to a map from multiple goroutines ✓
  • 4.Using a floating-point number as a map key
9.How does Go handle nil pointer dereferencing?
  • 1.It returns zero value silently
  • 2.The program exits with a segmentation fault
  • 3.The Go runtime recovers and retries execution
  • 4.It panics and may be recovered with a defer function ✓
10.Which of the following Go structures supports field inheritance-like behavior?
  • 1.Classes
  • 2.Struct embedding ✓
  • 3.Interfaces
  • 4.Function closures
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