I think you misunderstood what Alexa skills are. Skills are essentially programs that a 3rd party created to perform a particular task. Think of skills as apps on your smartphone. But skills are voice controlled and used on your Echo device. It is possible for someone or some company to make a skill that can accomplish what you desire.
Think of the Echo device as a computer. When you take a new computer out of the box, it has some basic functions. Echo has some basic functions too. On a computer, if you want to play Angry Birds, you'd have to download and install it. Same on the Echo. Out of the box, the Echo does not have the Questions and Answers ability that you desire. Is there a skill for this? I don't know. You might want to search in the Alexa Skill catalogue (just like searching the App Store on your smartphone). If you find the skill that does what you want, just enable it and try it out. Keep in mind that most skills are free, but not all of them. It is inevitable that companies that create useful skills will want to monetize from their work.