Identify which of following are statements :
a) Krishna is black . 
b) How black is Krishna?

Dear Student,
Solution) 
a) Krishna is black. 
It cannot  be assigned true or false. Because it is a command.
So, it cannot be called a sentence.
b) How black is Krishna? 
It cannot be assigned true or false. Because it is a question.
So, it is not a statement.
Regards!