I could provide a simple example that I have had some clients use.
"This question is an example of the test questions we will be asking you throughout the survey, to ensure you are focused and reading the questions carefully. We need to ask these questions to ensure the quality of the data we collect."
Please select the response ‘Blue’ from the list below. Please select one response only.
You can insert a small bunch of ATTENTION CHECKER questions in your survey to observe how focused the respondent is. You can warn the respondent if they answer the question incorrectly, or you can filter out respondents after the survey is closed if they answer these questions incorrectly.
I suggest you monitor these questions during field work via the admin module.