Answer: C) What's it made of?
Explanation for this question is being written.
Answer: A) Do you know what year your house was built?
Answer: D) Was the missing hiker found by the rescue team?
Answer: B) False
Answer: A) Active Voice.
Answer: A) By whom can Gandhi's integrity be questioned?
Answer: C) Was the door cleaned by Harry?
Answer: A) Can the potatoes be roasted in five minutes?
Answer: C) By whom was my watch stolen?
Answer: B) Passive
Answer: A) Was the cake eaten by the children?
Answer: B) Passive Voice.
Answer: C) Where was the pencil found by him?
Answer: B) By whom will we be helped with the arrangements?
Answer: B) Passive voice.