Electrical Safety Quiz
Questions: 16 · 10 minutes
1. Before replacing a bulb in a fixture, which action provides the soundest electrical precaution?
Leave the light on so you can confirm when the new bulb connects.
Wear fabric gloves while leaving the fixture energized.
Disconnect or isolate the power using the appropriate control, ensure it cannot be restored unexpectedly, and let the bulb cool.
Touch the metal fitting briefly to check whether current is present.
2. Why should an extension cord not be run beneath a rug?
The rug can reduce the voltage reaching the connected appliance.
Heat and damage can go unnoticed, increasing the chance of insulation failure or fire.
The rug can cause the electricity to flow into nearby furniture.
The cord will automatically draw more current whenever it is covered.
3. What condition is an RCD or GFCI designed to detect?
An imbalance indicating that some current may be flowing along an unintended path.
A gradual rise in normal electricity use over several months.
Any voltage variation between neighboring buildings.
A battery reaching the end of its useful charge.
4. A circuit breaker trips again soon after being reset. What does this most likely call for?
Holding the breaker in the on position to see whether it remains stable.
Replacing it with a breaker that permits more current without checking the wiring.
Leaving the circuit off and having the recurring fault or overload investigated by a qualified person.
Resetting it repeatedly until all connected appliances begin working.
5. How should you normally remove a plug from a wall outlet?
Pull the cord steadily while supporting it near the appliance.
Twist the cord until the plug loosens from the outlet.
Insert a thin object beside the plug to lever it out.
Grip the plug body and pull it out without tugging the cord.
6. What is the main purpose of lockout/tagout procedures during equipment maintenance?
To prevent unexpected energization or release of hazardous energy while work is underway.
To record how much electricity the equipment uses during normal operation.
To let other workers operate the equipment at a reduced speed.
To identify which equipment is due for routine cleaning.
7. You see a fallen overhead power line across a sidewalk. What should you do?
Move it aside with a dry wooden object so others can pass.
Stay well away, warn others to keep back, and contact emergency services or the utility.
Approach far enough to determine whether the line is still humming.
Walk around it closely, provided you do not touch the wire itself.
8. Why is connecting one power strip to another generally unsafe?
The second strip prevents grounded plugs from operating correctly.
Electricity becomes less stable each time it passes through another strip.
The connected appliances receive twice their intended voltage.
The combined load can overload the upstream strip, plug, or outlet and cause overheating.
9. What is the purpose of the grounding pin on a grounded plug?
It provides a lower-resistance fault path that helps protective devices disconnect the supply.
It supplies extra current when an appliance starts.
It allows an appliance to keep operating after a fuse opens.
It prevents the outlet from being overloaded by multiple appliances.
10. You notice that an appliance cord has cracked insulation with inner wiring visible. What should you do?
Keep using it as long as the exposed section does not touch the floor.
Cover the crack tightly with ordinary household tape and continue using it.
Use it only on a lower power setting so less current passes through the cord.
Stop using it and disconnect it safely until the cord or appliance is professionally repaired or replaced.
11. A person is receiving an electric shock and may still be in contact with the source. What is the safer immediate approach?
Pour water nearby to help separate them from the electrical source.
Pull them away by their clothing before switching off the electricity.
Do not touch them directly; disconnect the source only if this can be done safely, call emergency services, and follow their instructions.
Wait to see whether the electrical contact ends without intervention.
12. What is the primary safety function of a correctly rated fuse or circuit breaker?
To keep the voltage supplied to every appliance perfectly constant.
To interrupt excessive current before wiring or equipment is dangerously overheated or damaged.
To prevent all electric shocks whenever a person touches live conductors.
To reduce an appliance's normal electricity use automatically.
13. A plugged-in kitchen appliance falls into a sink containing water. What should you do first?
Reach in quickly and lift it by its plastic casing.
Drain the sink before doing anything about the electricity.
Keep away from the water and disconnect power at the breaker or another safe isolation point before further action.
Pull its cord from across the room until the plug comes free.
14. A job would place a ladder and long materials near overhead electrical lines. Which plan most directly controls the electrical hazard?
Use a metal ladder because its frame is easier to stabilize.
Work quickly so the ladder remains near the lines for less time.
Wear ordinary work gloves while allowing the ladder to pass closer to the lines.
Relocate or plan the task to maintain the required safe clearance, consulting the utility or a qualified authority when necessary.
15. Why can some electrical equipment remain hazardous after it has been unplugged?
Components such as capacitors may retain a dangerous electrical charge.
Its grounding conductor can generate new voltage after disconnection.
Its fuse may continue supplying current for several minutes.
The disconnected plug may draw electricity from nearby outlets wirelessly.
16. Your hands are wet when you are about to plug in a countertop appliance. What is the safer response?
Hold the insulated plug body and avoid touching its metal pins.
Dry your hands and the surrounding surface before handling the plug or appliance.
Switch the appliance off, then plug it in while your hands are still wet.
Use a cloth to hold the plug while connecting it.