2025 RET Units 100 200 NOCTI review

What range best describes the minimum lethal electrical shock current?

• 6-25 mA

• 9-30 mA

• 100-200 mA

• 250-400 mA

What class of fire extinguisher should be used on electrical fires?

• Class A

• Class B

• Class C

• Class K

What health hazard is a concern due to the materials present in some electrical components?

• carpal tunnel syndrome

• chemical inhalation

• hearing loss

• surface/skin burns

What document lists hazards associated with toxic substances in the workplace?

• Emergency Instruction Sheet

• Globally Harmonized System

• Rapid Treatment Plan

• Safety Data Sheets

Which prefix is equivalent to multiplying by 1,000,000?

• giga (G)

• kilo (k)

• mega (M)

• milli (m)

What value is the equivalent of 1.6 x 10^-4 A?

• 16 μA

• 160 μA

• 1.6 mA

• 16 mA

Which value is in proper engineering notation?

• 3.74 x 10⁶

• 0.374 x 10⁷

• 3740 x 10³

• 374 x 10⁴

An atom that has lost its valence electron(s) is:

• a negative ion

• a neutral ion

• positive ion

• valence free

The best conductors have a valence shell containing:

• 1 electron

• 2 electrons

• 3 electrons

• 4 or more electrons

A semiconductor has a valence shell that is:

• full

• half full

• mostly full

• nearly empty