Excuse me; what are the main questions asked in the US consulate interview?

I also came to the United States through a K visa. Mine was a K1 fiancee visa. I guess yours was a K3 marriage visa.

I didn’t hear that the visa officer asked about the emergency number and who the president is. . .

The most common question is what was the process like when you met and got married, your husband’s address, phone number, birthday, workplace, names of his parents, brothers, sisters, children, etc. The visa officer will Ask to see evidence of your relationship.

You immigrated by marriage, so the visa officer cares most about whether your relationship is genuine and whether you know your husband and his family. This has nothing to do with emergency calls. Generally, in the United States, call 911 for any emergency. That's it.