![...on its center axis
until the lights turn green.
...on its center axis
until the lights turn green.](https://content2.mcqstudy.com/ss/tbbt-8-22-00:04:23.090.jpeg)
...on its center AXIS
until the lights turn green.
The Big Bang Theory Season 8, Episode 22
![...by an inclined plane
wrapped helically around an axis.
...by an inclined plane
wrapped helically around an axis.](https://content2.mcqstudy.com/ss/tbbt-4-5-00:16:57.185.jpeg)
...by an inclined plane
wrapped helically around an AXIS.
The Big Bang Theory Season 4, Episode 5
![...by an inclined plane
wrapped helically around an axis?
...by an inclined plane
wrapped helically around an axis?](https://content2.mcqstudy.com/ss/tbbt-4-5-00:09:16.022.jpeg)
...by an inclined plane
wrapped helically around an AXIS?
The Big Bang Theory Season 4, Episode 5
![at which the Earth
rotates on its axis,
at which the Earth
rotates on its axis,](https://content2.mcqstudy.com/ss/tbbt-7-2-00:00:13.474.jpeg)
at which the Earth
rotates on its AXIS,
The Big Bang Theory Season 7, Episode 2
![The rate of spinning
for the central axis centrifuge
The rate of spinning
for the central axis centrifuge](https://content2.mcqstudy.com/ss/tbbt-10-20-00:03:21.118.jpeg)
The rate of spinning
for the central AXIS centrifuge
The Big Bang Theory Season 10, Episode 20