1. Can you sink an orange?
2. Can you sink one orange?
3. Can you sink any orange?
[Does #1 mean only #2? What about #3? Can #1 mean #3?]
4. Can you sink oranges?
[In this sentence, is 'oranges' a generic noun? Or do oranges mean some oranges?]
5. Can you sink the orange?
[What about 'the orange' here? Does 'the orange' mean the specific orange all the time? Can 'the orange' mean a generic noun sometimes?]
I guess 1 could mean either 2 or 3. It would depend on the circumstances.
4 - in general, yes
5 - a specific orange, yes