Pick up the incorrect statement from the following:
- AChannelization of pavement is caused by constant use of tri-cycle gears of aircraft
- BBlast pads are used over cohesionless soils to resist erosion due to tremendous speed of the jet blast
- COver-run areas of at least 300 m length on either side of the runway are provided
- DNone of theseCorrect
Solution
Concept
Airport pavement and runway features
Step-by-step solution
1. Channelization: the wheel path of aircraft tricycle gear repeatedly follows the same track, so pavements show channelization. 2. Blast pads protect the soil from the erosion due to the jet blast. 3. Over-run (stopway) areas are provided beyond the runway ends. 4. All the statements are correct, so none of them is incorrect.
Explanation
All three statements are accepted as correct in the standard treatment of airport pavements and runways (and by the official key), so the answer to "pick the incorrect statement" is "none of these".
Why the other options are wrong
Choosing A, B or C would mean treating a correct statement as incorrect.
Shortcut
When all statements look correct for an "incorrect statement" question, the answer is usually "none of these".
Common mistake
Picking any option without checking all of them.
Correct answer: D) None of these