Q: Potential energy is present in objects that are what? Choices: - crystals - rigid - unstable - elastic A:
elastic

Q: What bond is the force of attraction that holds together oppositely charged ions? Choices: - magnetic - iconic - harmonic - ionic A:
ionic

Q: Q: What is it called when rays focus at different distances from the lens? Choices: - constant aberration - carbon aberration - angular aberration - spherical aberration A:
A: spherical aberration

Question: Q: What type of masses are structureless particles that cannot spin? Choices: - weightless masses - turning masses - inertial mass - point masses A:
Answer: point masses

*Question*
Q: What do you call the system of glands that release chemical messenger molecules into the bloodstream? Choices: - homeostasis system - nervous system - limbic system - endocrine system A:
**Answer**
endocrine system

Q: Primary batteries are single-use batteries because they cannot be what? Choices: - UP ticked. - refreshed - plugged - recharged A:
recharged