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All answers are from Article 100.
duty: operates at a substantially constant load for an indefinitely long
2. The definition isn't just a house or apartment--it's more inclusive than that. A dwelling is one or more rooms for the use of one or more persons as a housekeeping unit with space for eating, living, and sleeping and permanent provisions for cooking and sanitation.
3. One-family, two-family, and multi-family.
4. Many people confuse "energized" with "on" and "de-energized" with "off." That can literally be a fatal mistake. Something is "energized" any time it's connected to a source of power. A disconnecting means and a switch each serve different purposes.
5. An explosion-proof device contains the flame of an explosion that occurs within it. It does not protect equipment from an explosion.
6. Wiring is accessible if a qualified person can expose it without damaging the structure or finish of the building. Wiring is exposed if a person can touch it or approach it at an unsafe distance. Exposed wiring is, by definition, "not suitably guarded, insulated, or protected." Sometimes, you must expose wiring to work on it. That requires the wiring to be accessible. However, it should not be exposed when you are done working on it. It just needs to be accessible.
7. A garage is a building or portion of a building in which one or more self-propelled vehicles can be kept for use, sale, storage, rental, repair, exhibition, or demonstration purposes.
8. This rating is the highest current (at rated voltage) that a protection device is intended to interrupt under standard test conditions. Note: devices of the same interrupt rating may not be suitable for the same purpose.
devices have a marking or label showing they have been tested to meet
the criteria of the labeling authority.
10. Damp locations are protected from weather
and saturation, but not moisture.