Yes, "Junk Warrior" copies Level 2 and lower monsters' current ATK, not necessarily their original ATK. So other cards like "The Calculator", "King of Skull Servants", and more would work with "Junk Warrior".
Yes, it remains on the field and can attack as long as your opponent does not activate another effect.
In general, if one effect tells you to do something, and another effect says you cannot do that thing, the can't effect will win out. So if a monster says it must attack, it doesn't win out over an effect which says it can't attack. If a monster can attack all of the opponent's monsters, this does not override the effect which makes one of them unable to be selected as an attack target.
Not inherently, no, they get one single attack like most monsters. They can only attack twice if an effect is letting them do so.
No! You can never call off an attack once you have already declared it. The only way you can is by a card's effect.
Unless another card specifically denies the attack or if it was Special Summoned AFTER the Battle Phase, then yes the Special Summoned monster may attack.
No. Giving up your attack for the turn is his condition to use the effect. Once you attack, you can't activate the effect.
The Delhi Sultante was formed.
Yes, it remains on the field and can attack as long as your opponent does not activate another effect.
In general, if one effect tells you to do something, and another effect says you cannot do that thing, the can't effect will win out. So if a monster says it must attack, it doesn't win out over an effect which says it can't attack. If a monster can attack all of the opponent's monsters, this does not override the effect which makes one of them unable to be selected as an attack target.
The effect of a Cannizzaro reaction involves the attack of hydroxide. This results in an attack on another molecule, which results in the exchange of a proton.
Yes. This effect is sometimes referred to as marching ants.
No, it does not. It the attck is negated, it is like the attack never happened and the effect can not take place.
Ultimate Tyranno's effect forces you to attack all of your opponent's monsters with it FIRST. Meaning, if it is in Attack Position, at the beginning of your Battle Phase, it must be the first monster that you attack with, and it must attack all of your opponent's monsters, once each.Because of this, Ultimate Tyranno's effect is not essentially "activated". It has a "continuous" effect, meaning that the effect takes place the second it hits the field. So in answer to your question, it is not a matter of whether you CAN, it is the fact that you MUST utilize its effect during each of your Battle Phases, as long as it is on the field in face-up Attack Position.
Unless there is a card effect preventing it, it can attack.
No, this is considered targeting an opponent's monster with a card effect, not an attack.
Rocket Warrior's Effect:This effect is only active during the Battle Phase of your turn. Battle Damage to this card and this card's controller that they take from a battle involving this card becomes 0. After damage calculation, decrease the ATK of the monster that was attacked by this card by 500 points until the end of this turn.I'm assuming that you're talking about the 2nd part of the effect, in which case the answer is - after. The effect is to lower the attack of a monster after rocket warrior has attacked it and in doing so rocket warrior and his controller take no damage. If rocket warrior destroys the monster in the attack, the second effect is moot.
Yes; it has nothing in its effect stating against the fact that it can attack.