Do you want to know whether a particular set of search queries are popular on YouTube? Here is an easy tip to know that, and it's from Google itself.
Go to Google Trends, search for your desired search queries (or keywords) in the search box, let’s take “iPhone 8” for example. You’ll find an option called “Web Search” there, click on that, you’ll get “YouTube Search”. So, in this graph you can see the "Interest over time”.
"Numbers represent search interest relative to the highest point on the chart for the given region and time. A value of 100 is the peak popularity for the term. A value of 50 means that the term is half as popular. Likewise a score of 0 means the term was less than 1% as popular as the peak.”
You can tweak the time range, categories, countries, and much more. You can also compare the search queries and get related topics/queries if you are targeting specific keywords. Do check this tool and let us know your views.