Question

long hair in the laboratory must be cut short. held away from the experiment with one hand. always neatly groomed. tied back or kept entirely out of the way with a hair band, hairpins, or other confining device. in a laboratory, the following should not be worn. loose clothing dangling jewelry sandals all of the above

Explanation:

For the first question, in a laboratory, long hair should be tied back or kept out of the way (not cut short as it's not necessary, holding with hand is impractical, neat grooming is not the key safety - related requirement). For the second question, loose clothing can get caught in equipment, dangling jewelry can be a hazard, and sandals don't provide proper foot protection, so all of the above should not be worn.

Answer:

First question: tied back or kept entirely out of the way with a hair band, hairpins, or other confining device. Second question: all of the above.