Part 2: Chapter 10

1) Where does the voice “You are the dead” come from?

After Julia and Winston make their statement, “We are the dead,” a voice chimes in from the telescreen and says, "You are the dead," which eventually the two of them find out to be Mr. Charrington.

2) What happens to the paperweight? How is this symbolic of Julia and Winston’s story?

The paperweight is smashed when the troops come over to arrest Julia and Winston, and it represents their relationship being smashed apart, and them being torn away from each other, and out of their eternal sanctuary that Winston found them within the glass walls of that paperweight.
 
3) What does Charrington turn out to be?

Mr. Charrington, the kind and accepting antique store owner turns out to have been a Thought Police, leading Winston and Julia on in thinking he is just an innocent prole storekeeper.