What is the difference between an objection based on the form of the question and an objection based upon the substance of the question?

Answer 1

As to form, think of it as "how" is the question asked. As to substance, think of it as "what" information is the question seeking. Some questions are asked in a manner that is not allowed in court, such as "leading questions." The question might be seeking legitimate testimony, but just not legitimately phrased under the rules of evidence. The objection will be as to the form of the question. Some questions seek testimony that does not have to be given, such as priveledged information. That kind of question might be legitimately phrased but seeking testimony that according to evidence rules the witness does not have to provide. That objection will be as to the substance of the question.