Question

how long does it take for the earth to make one complete revolution around the sun?
365 days (actually 365.25 - thats why we have leap year every 4 years and add one day)
5 years
24 hours
27-30 days

Explanation:

The Earth's orbital period (revolution around the Sun) is approximately 365.25 days. The 0.25 part accumulates, so we have a leap year every 4 years (adding a day) to account for it. 5 years is incorrect, 24 hours is Earth's rotation period (day), and 27 - 30 days is typical for a Moon - related period or some planetary rotations, not Earth's revolution around the Sun.

Answer:

365 days (Actually 365.25 - that's why we have leap year every 4 years and add one day)