Do you think that the topics that are being asked by the researcher through Research - Gate are within his specific competence?
Not necessary - it can be any question as long as can contribute to knowledge. Also some of the answers are "one man's trash is another man's treasure" because different researchers coming from different backgrounds.
... this is an open platform for researchers to interact with each other and this openness should also encompass the range of topics under discussion. Under this platform free exchange of thoughts and ideas is of utmost importance.
I think that the answer for most of the asked questions is yes, but sometimes the questions reflect a desire from the questioner to expand the horizon of his general information...
Research Gate is a knowledgeable group of person joining with the research with an end to ask their knowledge where they may get the exchange of their views under the discussion as we know that knowledge is power & there is no limit to the knowledge . With the discussion & opportunities for learning the areas from various researcher , new ideas creating the further research may prove to be a guideline for the researcher .