What does "true-false" mean?

Allowing only the answers "true" or "false".

True-false

adj

adj ·Rare ·Advanced level

Adjective

1
Allowing only the answers "true" or "false". not-comparable
"Somehow he got one true-false question wrong out of twenty."

Adjective

1
offering a series of statements each of which is to be judged as true or false wordnet

"Somehow he got one true-false question wrong out of twenty."