Leave one switch off, turn two switches on, wait a few minutes, then turn one of the switches back off. Go into the room with the bulbs and feel the 2 that are switched off. The bulb that is warm is the one you switched off, the cold one is the switch that was never on, and the light still on is the switch you left on

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Tekelec Overview (TKLC)

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Website www.tekelec.com

HQ Morrisville, NC

Industry

Copper-Wire Switching & Transmission Equipment Manufacturing

Size

1,200+ Employees, $469M+ Revenue

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Huawei Technologies, Agilent Technologies, Nokia Siemens Networks

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Interview Question for Software Test Engineer at Tekelec:

You are in a room with 3 light switches, there is another room you cannot see with 3 light bulbs. Each switch is known to control exactly one of the bulbs. How can you tell which bulb is controlled by which switch, if you can only walk into the room with the bulbs one time

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