Q1) Why is it important to apply 'PACC' when communicating in different social situations?
In different social situations, we will need to communicate differently as the topics of the chats will be different too, and PACC will help us to communicate easily and keep the conversation going. We will also be less likely to offend someone without meaning to during the conversation.
Q2) If a majority of your classmates hold a certain view about a controversial topic, while you hold an opposing view, how would you convey your thoughts politely?
I would first listen to my classmate's thoughts and opinions, then point out my view to him, then I'll slowly explain my view and why I disagree with him. My tone would also be light and casual, I would not start screaming at my classmate.
Q3) What are the possible repercussions (consequences) if the tone & register were used wrongly?
The conversation would not be going the way you wanted it to be and will most likely end badly. The other party will feel offended or angry and will most likely avoid any conversation with you in the future. The other party may also strike back at you, resulting in a fight.