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How does a nil channel affect its communication case inside a select statement?

The case behaves like default

❌

The case is always ready

❌

The case cannot proceed and is effectively disabled

✅

The select immediately panics

❌

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Which statement about closing channels is correct?

Every channel must be closed before a function returns

❌

Closing removes all buffered values immediately

❌

A receiver must always close the channel

❌

Closing a channel signals that no more values will be sent

✅

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Which situation is a typical reason to configure an HTTP timeout in a Go service?

To replace TLS encryption

❌

To guarantee that every request succeeds

❌

To prevent an operation from waiting indefinitely for a slow or unresponsive peer

✅

To increase the number of CPU cores

❌

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What happens if a goroutine sends to an unbuffered channel and no receiver is ready?

The channel is closed automatically

❌

The send blocks until a receiver is ready

✅

The value is discarded

❌

The goroutine always panics

❌

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Under which condition can recover stop an active panic?

When recover is called only from main

❌

When recover is called directly by a deferred function while that goroutine is panicking

✅

When recover is called before panic

❌

When recover is called from any goroutine

❌

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What is a goroutine?

A special type of HTTP request

❌

A package used for testing

❌

A lightweight concurrent execution unit managed by the Go runtime

✅

A database transaction

❌

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What is the main purpose of a database transaction?

To create an HTTP connection pool

❌

To convert SQL into Go source code

❌

To group operations so they can be committed or rolled back as a unit

✅

To cache every query result permanently

❌

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Which statement about Go's race detector is correct?

It detects data races that occur during the instrumented execution, so unexecuted race paths may remain undetected

✅

It detects only deadlocks, not data races

❌

It removes races automatically before tests run

❌

A clean race-detector run mathematically proves that the program contains no races

❌

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What does http.Request.Context() return?

The HTTP response body

❌

A database transaction

❌

The global context of the Go runtime

❌

A context associated with the HTTP request

✅

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What does the range keyword provide when iterating over a slice with two variables?

The index and a copy of the element value

✅

The index and the slice capacity

❌

The element value and the slice length

❌

Two copies of the element value

❌

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