Part 1 of "The Deathly Hallows: Part 2" Quiz

Answer: Bellatrix Lestrange and Draco Malfoy

This conversation occurs in a bedroom at Shell Cottage, where Ollivander is recovering after being rescued from Death Eaters, at the end of the previous movie. Ollivander remembers any wand he has ever made. He holds each wand and identifies what wood has been used, how long it is, whether the wand is pliable or unyielding and what its inner wand core is. He then mentions who each wand previously belonged to. After identifying Malfoy's wand, he says that he believes that the wand has switched its allegiance to Harry.
Ollivander is played by John Hurt and Harry is played by Daniel Radcliffe.

Answer: They are hidden under the invisibility cloak.

Harry carries Griphook on his shoulders and they are both covered with the invisibility cloak. They walk beside the disguised Hermione and Ron, passing both goblins and guards.
Griphook is played by Warwick Davis, Hermione is played by Emma Watson and Ron is played by Rupert Grint.

Answer: her wand

When Hermione/Bellatrix enters Gringotts, all of the guards and goblin tellers seem to be on edge. It is highly likely that they have been warned to look out for impostors. The fact that Harry is already in possession of Bellatrix's wand is likely the reason she is asked to produce it.

The goblins would know that if she has the wand, she cannot be the real Bellatrix. At first Hermione tries to imperiously declare that she does not have to show her wand, but the goblin does not back down. They end up getting co-operation from the teller when Harry uses the Imperius Charm on him.

This gets them deep into the tunnels.

Answer: The cart runs through the Thief's Downfall.

The Thief's Downfall is a waterfall that falls on the tracks. It is one of Gringotts' security devices, that washes away anything magical that is used to hide something. The effects of the Polyjuice Potion are negated, as is Ron's disguise. The Thief's Downfall even negates the effects of the Imperius curse on the goblin who is accompanying them. What's worse is that an alarm is set off, alerting Gringotts to the fact that they have impostors and would-be thieves in their midst. Fortunately they are still able to retrieve the Horcrux from the vault.

Answer: He learns it through Voldemort's thoughts.

After they jump off the dragon's back into the lake, Harry's scar begins to hurt. He has another 'connection' with Voldemort, while still underwater. Harry learns that Voldemort knows what they took from Gringotts and knows that they are hunting Horcruxes. He becomes worried about the security of the rest of them, and in doing so identifies that one is hidden at Hogwarts. Harry reads these thoughts and knows that they have to go to there next.
Voldemort is played by Ralph Fiennes.

Answer: They set off an alarm when they apparate in Hogsmeade.

Death Eaters have set up a detection charm or spell, that sets off a shrieking alarm, presumably based on movement. The Death Eaters do come out in force, shouting for Harry to reveal himself, which suggests that the charm or spell is attuned to Harry.

But while the three friends huddle in hiding and the Death Eaters appear to be getting close, a second alarm goes off, sending them off in another direction. The second alarm could not have possibly been triggered by Harry.

Answer: Aberforth Dumbledore

The eyes of the face in the mirror are very similar to Albus Dumbledore's. So much so that, in the book, Harry believes his old headmaster to be helping him still. Harry appealed to those eyes for help, when they were captured by Death Eaters (in "Part 1"). This was when Dobby was sent to help them escape.
In "Deathly Hallows: Part 2", after the second alarm distracts the Death Eaters, a door opens and a voice calls Harry and friends to safety. Once inside, they recognize the man as being Aberforth Dumbledore. Hermione sees a mirror on the wall, that is reflecting Harry's face even though Harry is not in front of it. The mirror has a piece missing, which corresponds to the piece that Harry has been holding onto.
Aberforth is played by Ciaran Hinds.

Answer: Neville Longbottom

Harry tells Aberforth that he needs to get into Hogwarts and, after a brief argument about whether or not Harry should trust Albus, Harry convinces Aberforth of his determination. Aberforth turns to a girl in a portrait and tells her that she knows what to do.

The girl (Ariana Dumbledore) nods, turns and walks down the road behind her. When she returns she brings Neville Longbottom with her, who is ecstatic to see Harry. While leading Harry, Ron and Hermione back to Hogwarts, Neville fills them in on this recently constructed tunnel, now the only secret passage in or out of the castle.

He brings them up to date on life at Hogwarts with Snape as headmaster and Death Eaters as professors. Neville takes them into a large room where many students, a lot of them former Dumbledore's Army members, seem to be hiding out.

They immediately assume that Harry is there to lead them in revolt and are eager to help.

Answer: Ron's

Having stirred the students and loyal staff of Hogwarts into offering resistance to buy him time, Harry sets off to find the lost Diadem of Ravenclaw. Hermione tells Harry that since they no longer have the Sword of Gryffindor with which to destroy the Horcruxes, they have decided to seek out a basilisk fang, which is what Harry had used to destroy Riddle's diary.

Hermione tells Harry that it was actually Ron's idea and says that it's brilliant. Harry agrees and gives them the Marauder's Map so that they can find him again.

Answer: Harry talks in his sleep.

Standing in front of the great door to the chamber with Hermione, Ron speaks a few words in Parseltongue and the snakes in the door begin to move, causing the door to swing forward. Hermione looks at Ron in surprise and he shrugs and says that Harry talks in his sleep. When he asks Hermione if she has ever noticed this, she seems quite put out that he would think that.
They take a tooth from the skeleton of the basilisk and Hermione stabs Hufflepuff's Cup with it, destroying yet another Horcrux.