*Question*
Q: What kind of lines does a diffraction grating produce? Choices: - nearly spaced lines - properly spaced lines - randomly spaced lines - evenly spaced lines A:
**Answer**
evenly spaced lines

*Question*
Q: Liquefaction ccurs when the molecules of a gas are cooled to the point where they no longer possess sufficient kinetic energy to overcome what? Choices: - intermolecular gravitational forces - gravitational attractive forces - bonding attractive forces - intermolecular attractive forces A:
**Answer**
intermolecular attractive forces

*Question*
Q: What is the term for the basic contractile unit of the muscle? Choices: - filament - sphincter - bandimere - sarcomere A:
**Answer**
sarcomere

*Question*
Q: Electrons are located at fixed distances from the nucleus, what are they called? Choices: - Energy layers - Positive levels - energy concentrations - energy levels A:
**Answer**
energy levels