Question

which of the following are the most appropriate deck fasteners?
roofing nails
hot - dipped galvanized nails
drywall screws
8 - penny finishing nails
electroplate galvanized nails
question 4
where is rot most likely to occur in deck and porch floors?
on the underside of the floorboards
where there is the most foot traffic
where there is no roof over the floor
near steps, due to the stringer attachments
at horizontal joints with end grain

Explanation:

For the first question, hot - dipped galvanized nails are a good choice for deck fasteners as they offer good corrosion resistance. Roofing nails are for roofing, drywall screws for drywall, 8 - penny finishing nails are more for finish work, and electroplate galvanized nails may not have as good corrosion protection as hot - dipped ones.
For the second question, rot is most likely to occur on the underside of the floorboards as this area can trap moisture and is less likely to dry out compared to other areas. Foot traffic doesn't directly cause rot, lack of roof doesn't necessarily mean rot will occur immediately, near steps and at horizontal joints with end grain are not the most common areas for rot compared to the underside.

Answer:

1. hot - dipped galvanized nails
2. on the underside of the floorboards