"If there is any" vs "If there are any"

Should I use "if there is any" or "if there are any" in the following sentences? Are they all correct? Can I ever use if there is any with singular countable nouns? 

  • Please let me know if there is any problem.

  • Please let me know if there are any problems.

  • If there is any book that is better than yours, it is this one.

  • If there are any books that are better than yours, it is this one.

  • If there is any scooter or bike parked in front my door, I will throw it away.

  • If there are any scooters or bikes parked in front my door, I will throw them away.

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