Question

which of the following questions leads to a binary answer? what color is the sky? what is your name? is the sky blue? what day is it?

Explanation:

A binary answer has two possible responses, typically yes - no. "Is the sky blue?" can be answered with either "yes" or "no". The other questions have multiple - valued answers. For example, "What color is the sky?" can have various answers like blue, gray, orange (during sunrise/sunset), etc.; "What is your name?" has a wide range of personal names as answers; "What day is it?" has seven possible days of the week as answers.

Answer:

Is the sky blue?