Avoid questions suggesting a certain answer. This kind of questions may contain terminology or word sequence that will lead the respondent to answer in a certain way. Often they include assumptions that are or maybe not true.
AVOID QUESTION : Is green your favourite colour?
Ask about one thing in a question. Combining questions in one sentence can make it difficult for respondent to answer and can make it impossible to interpret question correctly.
AVOID QUESTION : Please score quality and price of product X on a scale 1 (very good) - 5 (poor).
Confusing or wordy questions
Make sure your questions are not too long and can be interpreted in the same way by all survey participants.
Questions not related to survey objective
Make sure your questions are in line with survey objective. A good way to check it is to ask somebody to read your survey or to test it on a small sample.
Slang words of abbreviation
Don't use words that may be difficult to understand like slang, jargon or abbreviations.