Knowledge
Knowledge is the simplest type of question. "To exibit memory of preciously-learned meterial by recalling facts, terms, basic concepts and answers."
Key Words
Who, what, why, when, omit, where, which,choose, find,how, define, label, show, spell, list,name, relate, tell, recall, select.
Questions
What is...?
Where is...?
How did...?
Why did...?
Can you recall...?

Example 1
Q. About how long ago was the sun created?

A. 4.6 billion years ago.

Example 2
Q. Are the planets Mercury, Venus, Earth, and Mars inner or outer planets?

A. Inner planets

Example 3
Q.If the sun was hollow, how many Earths could fit in it?

A. 1.3 million