There's several factor that makes a problem to be a good research.
These are the types of problem that would demand good research to assuage the problem.
1) Causes Death or Impair Health. Human Life is the most priced item on plannet Earth, so anything that would enhance or prolong life is definitely a good research problem.
2) Save Cost: Cost effectiveness is important in all aspects of life , either domestic or commercial. Thus whatever that would reduce cost of it producing an item or consuming an item is a good research problem.
3)Discovery. Any problem that would bring about beneficial new discovery is worthy to be scientifically investigated as a research problem.