Question

write the type of sentence. 1)what does it do ? 2) Rohit shut the door.3) Rajarao got an injury on his head.

Answer 1

1:-)Interrogative sentence 2:-)Imperative sentence 3:-)Declarative sentence

Answer 2

1) What does it do? - Interrogative Sentence 
2) Rohit shut the door. - Declarative Sentence (or also called "Assertive Sentence")
3) Rajarao got an injury on his head - Declarative Sentence

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1# Every sentence that appears to be a question, is an "Interrogative Sentence".
2 & 3# Any normal sentence that conveys a fact is known as a "Declarative Sentence" or "Assertive Sentence".