View All num of num See all Photos Halliburton www.halliburton.com Engaged Employer Overview Reviews Salaries Interviews Jobs Photos Benefits 820 Reviews 1.2k Salaries 436 Interviews 219 Jobs Follow Add Interview Follow Add Interview Interview Question Intern Interview(Student Candidate) Houston, TX Halliburton Brain Teaser: Given a room with 3 light bulbs which have their respective three switches (On/Off) outside the room. You don't know which switch corresponds to which light bulb. You can do whatever you want with the switches but you can enter the room only once. How will you find which light switch corresponds to which light bulb? Tags: See more , See less 8 Answer Add Tags Answer Interview Answer 2 Answers ▲ 4 ▼ Hint 1: Think of what happens when a light bulb glows?Hint 2: It gets heatedAnswer: Switch on one bulb for some time. Then switch on another bulb and go into the room. The bulb which is on and hot is the corresponding to the switch you switched on first. The other glowing bulb corresponds to the switch you switched on second. Interview Candidate on Oct 21, 2012 ▲ 0 ▼ Hint 1: Imagine that the room has a door.Hint 2: Open it.Answer: flip the switches and observe which one corresponds to which bulb. You don't even need to enter it. Anonymous on Apr 29, 2013 Interviews > Intern > Halliburton Add Answers or Comments To comment on this, Sign In or Sign Up.