Here is how I would answer them.
Describe your technical method of crossing crevasses safely: I approach with caution, probing the area I am going to cross. I will approach slowly, and cross the crevasse.
Describe your method of self-rescue from a crevasse: Assuming I am not very deep into the crevasse, I will extricate myself with my ice tools and/or ski poles. If I am too deep, I will attempt to summon help by whatever means necessary and at my disposal.
A: Since it is not in my plan to fall into a crevasse, if I do, I will use whatever time I have left to slowly melt an epic poem, extemporaneously composed, into the ice-wall with my tongue while I die of hypothermia.