Yes. An effect that will only affect face-up monsters will specify so in the text.
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Face-down monsters are indeed monsters for the purposes of cards which count monsters on the field or affect all monsters.However, if a card effect specifies a monster with a specific type, attribute, ATK, etc., it will ignore face-down monsters because those values are unknown in game terms.Note: monsters used as Equip cards are not considered monsters.
No. Monsters are only ever flipped if they are Flip Summoned, attacked while face-down, or when a card effect specifically says they are flipped. Monsters are never considered flipped if destroyed, or tributed while face-down.
Skill Drain will do the following:If a monster activates an effect, and the monster is face-up on the field when that effect resolves, then that effect will be negated.If, when the effect resolves, the monster is not face-up on the field, then the effect will resolve as normal. This happens to monsters who activate and resolve in different zones, monsters tributed for the activation of their own effect, and monsters destroyed, or flipped face-down before their effects can resolve.A monster's continuous effect will be negated until Skill Drain is removed from the field.
No monster can activiate its effect while face down unless it specifically says so; only face up.If you are referring to monsters who say their effects activate when Flip Summoned, that means you must flip the monster up manually during your Main Phase after it is set face down. A monster fliped face up from an attack does not count as a Flip Summon.
Monsters cannot manually change their battle position after attacking, but Medusa Worm has an Ignition Effect which flips it face down. You can flip summon Medusa Worm in main phase 1 to get the effect, then attack in the battle phase, then activate the Ignition Effect in main phase 2 to flip it down again.