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Quiz: ENGINEERING Challenge #8: The I's have it!

Welcome to the ENGINEERING.com Challenge #7. Have a look at the images below and enter the common engineering term that relates to the picture starting with the letter I!

Instructions: For each question fill in the appropriate answer. The answer box will turn green if your response is correct and red if incorrect. Take as much time as you need.

As an example: 3.141592 is pi
Good Luck!

CORRECT ANSWERS: 0 / 16
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CORRECT ANSWERS: 0 / 16