Which component is a toggle switch that locks in a set position?

• A. Lever lock
• B. Rheostats
• C. Microswitch
• D. Rotary selector

Answer: (A)

The key idea here is a switch that stays in the chosen position until someone deliberately unlocks and changes it. A lever lock uses an extra locking mechanism—often a lever or latch—that engages after you set the toggle, so vibration or incidental nudges won’t move it. You have to deliberately release the lock to reposition it, which is exactly what “locks in a set position” means in practice.

Rheostats are variable resistors and aren’t about toggle positions at all. A microswitch is a small snap-action switch that changes state quickly, but it doesn’t inherently hold a position locked in. A rotary selector is a knob that changes circuits by rotating to different positions, not a toggle that locks in place.