The correct interface in Go that allows you to define custom JSON marshaling and unmarshaling logic is the json.Marshaler and json.Unmarshaler interfaces. By implementing these interfaces for a custom type, you can control how instances of that type are converted to JSON when marshaling and how JSON data is converted back to instances of that type when unmarshaling. This customization is useful when you need to handle special cases or non-standard JSON formatting requirements.

Channels are a preferred choice for inter-goroutine communication in Go due to their safety features and built-in synchronization, simplifying the development process.

In Go, methods with pointer receivers can modify the fields of the receiver struct, while methods with value receivers cannot. This is because methods with pointer receivers operate on the actual instance of the struct rather than a copy.

The correct option is Query. The Query method in database/sql package is used to execute a SQL query that returns rows. This method is used when you expect rows to be returned from the query execution.

Polymorphic programming is promoted by Go interfaces, enabling different types to be treated uniformly through shared interfaces. This encourages code reuse, flexibility, and adaptability by allowing functions and methods to accept a wide range of types as arguments without the need for explicit type declarations.

The correct operator to perform bit clear (AND NOT) in Go is the '&' operator followed by the '^' symbol, forming '&^'. This operator clears bits in the first operand based on the corresponding bits in the second operand.

In Go, the _______ data type is represented by the string type. A string is a sequence of bytes, commonly used for representing text data. It is immutable and UTF-8 encoded, allowing for efficient handling of text in various languages.

The "panic" function in Go is used to cause the program to terminate immediately with a runtime error message. This function is typically called when a critical error occurs that cannot be gracefully handled, leading to an abrupt termination of the program.

In Go, anonymous functions are declared using the func keyword followed by an optional parameter list and return type. Thus, the correct option is 'anonymous'.

In Go, the 't.Parallel()' method in the 'testing' package is used to allow parallel execution of tests. When a test function calls 't.Parallel()', it informs the testing framework that this test can be run in parallel with other tests. This can help in speeding up the test execution time, especially when dealing with I/O-bound or CPU-bound tests. It's essential to ensure that the test functions are safe for parallel execution to avoid race conditions or other concurrency issues.

Yes, in Go, variables can be declared without being initialized. When a variable is declared without an explicit initialization, it's assigned the zero value of its type. This is one of the key features of Go's memory safety, ensuring variables always have a valid value.

When working with JSON in Go, it's important to avoid common pitfalls to ensure robust and maintainable code. One such pitfall is ignoring JSON field tags, which are used to specify custom field names, omit fields, or handle field visibility during encoding and decoding. Failure to use JSON tags properly can lead to unexpected behavior or incorrect JSON output. Other common pitfalls include ignoring error handling when encoding or decoding JSON, using map[string]interface{} excessively instead of defining appropriate structs, and not considering struct field visibility, which can affect JSON encoding. By being aware of these pitfalls and following best practices, developers can write cleaner and more reliable JSON code in Go.