Suppose there are three light switches outside a room. Inside is a single light bulb, controlled by one of the three switches. You need to determine which switch operates the bulb. You can turn the switches on and off as many times as you wish (they are all off to begin with), but may only enter the room once. There is no one there to help you. The door to the room is closed, and there are no windows, so you cannot see inside. How can you discover which switch operates the bulb?
Submitted by: AdministratorDo the following steps:
☛ 1. Turn ON two switches, and leave one OFF.
☛ 2. Wait a few minutes.
☛ 3. Turn one switch from ON to OFF. One is now ON and two are OFF
☛ 4. Enter the room. - If the light is ON, it is controlled by the switch you left ON. - If the light bulb is OFF, touch it. If it is warm it is controlled by the switch you turned ON and OFF. If it is cold, it is controlled by the switch you never turned on.
Submitted by: Administrator
☛ 1. Turn ON two switches, and leave one OFF.
☛ 2. Wait a few minutes.
☛ 3. Turn one switch from ON to OFF. One is now ON and two are OFF
☛ 4. Enter the room. - If the light is ON, it is controlled by the switch you left ON. - If the light bulb is OFF, touch it. If it is warm it is controlled by the switch you turned ON and OFF. If it is cold, it is controlled by the switch you never turned on.
Submitted by: Administrator
Read Online Supervisor Mechanical Engineering Job Interview Questions And Answers
Top Supervisor Mechanical Engineering Questions:
☺ | Where do you see yourself in five years? Ten years? |
☺ | Do you have good computer skills? |
☺ | Do you have any question regarding this job As Supervisor Mechanical Engineering? |
☺ | Describe a typical work week for this position As Supervisor Mechanical Engineering? |
☺ | Why should I hire you As Supervisor Mechanical Engineering? |
Top Best Engineering Categories
☺ | Mechanical Engineering Interview Questions. |
☺ | Civil Engineering Interview Questions. |
☺ | Chemical Engineering Interview Questions. |
☺ | Electrical Engineering Interview Questions. |
☺ | Automobile Engineering Interview Questions. |