Question

important to tie back long hair in the science lab?
a to keep it styled neatly.
b to avoid seeing it in experiments.
c to prevent it from catching fire or dipping into chemicals.
d to comply with fashion trends.

15 which of the following actions is unsafe while working with open flames in a lab?
a using fire-resistant gloves.
b keeping flammable materials away.
c working at a safe distance.
d wearing loose clothing.

16 if you do not understand the instructions for an experiment, what should you do?
a ask the teacher for clarification.
b guess and proceed with the experiment.
c copy what your peer is doing.
d skip the confusing parts.

Explanation:

Question 1 (about tying back long hair in science lab)

Tying back long hair in a science lab is to prevent it from catching fire (e.g., near open flames) or dipping into chemicals (e.g., during experiments with liquids). Option C matches this safety reason. Options A (styling neatly) and B (avoid seeing in experiments) are not safety - related, and D (fashion trends) is irrelevant to lab safety.

• Option A: Using fire - resistant gloves is a safe practice when working with open flames.
• Option B: Keeping flammable materials away from open flames is a basic lab safety rule.
• Option C: Working at a safe distance from open flames reduces the risk of burns or fires.
• Option D: Wearing loose clothing is unsafe as loose clothing can catch fire easily when near open flames.

• Option A: Asking the teacher for clarification is the correct and safe approach. It ensures you understand the experiment to avoid mistakes or accidents.
• Option B: Guessing and proceeding can lead to incorrect procedures and potential safety hazards.
• Option C: Copying a peer may not be correct as the peer could also be wrong, and it doesn't ensure you understand.
• Option D: Skipping confusing parts can make the experiment incomplete or dangerous.

Answer:

C. To prevent it from catching fire or dipping into chemicals.

Question 15 (unsafe action with open flames in lab)