Normal summon, no. Special summon, yes.
The reason is, when Obelisk is normal summoned, no spells, traps or monster effects can be activated. That means it prevents anything being activated in the 'summon response' window, which is where you'd normally use cards like Trap Hole, Bottomless Trap Hole, Torrential Tribute, etc.
No. No part of Bottomless Trap Hole negates effects. However a monster's continuous effect requires it to remain face-up on the field. In those cases, the monster effect will cease to apply as the monster is gone.
It depends on the circumstances. Generally, "Bottomless Trap Hole" will be the better card; it works on Special Summons and it removes the monster it destroys from play. However, "Trap Hole" has one advantage: the monster summoned only needs 1000 ATK to trigger it, whereas "Bottomless Trap Hole" requires at least 1500 ATK. So, it would depend upon the type of deck you planned to use or went up against, but most people would choose "Bottomless Trap Hole".
The effect activates first, and you are actually chaining Trap Hole to that trigger. Trap Hole will resolve first, but it will not stop the monster effect from resolving. Unless a card says it negates a monster's effect, then it is still able to resolve its affect when flip summoned.
You can't use Bottomless Trap Hole in the Damage Step of the Battle Phase (the period of play that starts when the defending monster is flipped, to the time monsters destroyed by battle go to the graveyard and anything that triggers from that finishes resolving). But you can't use Call of the Haunted during those times either, so any valid use of Call of the Haunted can have Bottomless Trap Hole used against it if the monster has enough ATK. If Gorz is being summoned outside the Damage Step, then yes, Bottomless Trap Hole can be used against him. If he is being summoned due to battle damage, this is in the Damage Step, so Bottomless Trap Hole can't be used against him.
Bottomless Trap Hole does not target, so Tyrant Dragon is unable to negate it.
No. No part of Bottomless Trap Hole negates effects. However a monster's continuous effect requires it to remain face-up on the field. In those cases, the monster effect will cease to apply as the monster is gone.
Yes, it is a Quick Effect and can be chained to Bottomless Trap Hole.
Bottomless Trap Hole only removes the monster it destroys. If another Six Samurai destroyed itself to save the one BTH was used against, then neither the initial Six Samurai is removed from the game, nor the destroyed one, since neither were destroyed by Bottomless Trap Hole.
Synchro summoned is considered a special summon so Trap Hole won't have an effect on them. But try Bottomless Trap Hole or Torrential Tribute instead.
Torrential Tribute and Bottomless Trap Hole can only be used in response to a monster's summon. Attacking a monster does not summon it (note that if the monster is face down, this is a Flip and not a Flip Summon).
Bottomless Trap Hole destroys the summoned monster as well as removing it, meaning that Stardust Dragon can tribute itself to chain its negating Quick Effect to BTH's activation. This negation effect will resolve, negating and destroying Bottomless Trap Hole. Then in the end phase, Stardust Dragon will summon itself to the field.
It depends on the circumstances. Generally, "Bottomless Trap Hole" will be the better card; it works on Special Summons and it removes the monster it destroys from play. However, "Trap Hole" has one advantage: the monster summoned only needs 1000 ATK to trigger it, whereas "Bottomless Trap Hole" requires at least 1500 ATK. So, it would depend upon the type of deck you planned to use or went up against, but most people would choose "Bottomless Trap Hole".
A Fusion Summon is considered a special summon, so anything that can respond to a special summon (such as Bottomless Trap Hole) can be used against it.
Obsidian Dragon only negates S/T cards that 'target' one Dark monster on the field. Bottomless Trap Hole does not target, Obisidian Dragon cannot protect against it.
there was a bottomless hole of dirt and bugs
The effect activates first, and you are actually chaining Trap Hole to that trigger. Trap Hole will resolve first, but it will not stop the monster effect from resolving. Unless a card says it negates a monster's effect, then it is still able to resolve its affect when flip summoned.
A monster is considered destroyed when killed in battle with another monster. It is also destroyed when a card effect says so (Dark Hole, Trap Hole, Dark Armed Dragon, etc).Lastly, if one of your monsters is temporarily removed from your side of the field (removed from play or control switched to the opponent) it will be destroyed if it tries to return to your side of the field, but all your slots are full.A monster is not considered destroyed if it is discarded from hand, "sent from the field to the graveyard," tributed, or only removed from play (such as by Caius the Shadow Monarch's effect, but not by Bottomless Trap Hole's effect, since this Trap says "destroy and remove from play").