Question triggered contraptions

A question triggered contraption is like an Automatic activator but is triggered by Mario hitting a question block instead of triggering upon loading.

Types of question triggered contraptions
A Question triggered POW activator activates a POW when its question block is hit.

A Question triggered P-Switch activator activates a P-Switch when its question block is hit.

A Question triggered Key activator gives a key when it's question block is hit:

''You simply must put a key in a question mark block. When Mario hits the block, he automatically obtains the key.''

A Question triggered On-Off Switch activator activates an on-off switch when its question block is hit.

Sister classes
Because question blocks are so versatile, subtle maker tricks often use them