Thanks @Adriano Faria,
1. Regarding the number of questions, I can only add 5 and if I try to add more, I get this notification (attached) that I can't add more. I tried looking for some setting in the back-end but wasn't there. Please could you help locate that option to change the maximum number of questions?
2. Also, how can we add Yes/No questions where we want to provide just 2 options instead of 4?
Many thanks for your help on this.