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A light bulb is hanging in a room. Outside of the room there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are 'off' and the bulb is not lit. If it is allowed to check in the room only once to see if the bulb is lit or not (this is not visible from the outside), how can you determine with which of the three switches the light bulb can be switched on?
avatar

Senior QA Engineer

Interviewed at Akamai

4.3★
Dec 24, 2011

A light bulb is hanging in a room. Outside of the room there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are 'off' and the bulb is not lit. If it is allowed to check in the room only once to see if the bulb is lit or not (this is not visible from the outside), how can you determine with which of the three switches the light bulb can be switched on?

diff between union and unoin all . SDLC and STLC. What is baseline testing? What is benchmark testing? Difference between Verification and Validation: Explain Branch Coverage and Decision Coverage. The differences between Retesting and Regression testing
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Senior QA Engineer

Interviewed at [24]7.ai

4.4★
Jul 7, 2017

diff between union and unoin all . SDLC and STLC. What is baseline testing? What is benchmark testing? Difference between Verification and Validation: Explain Branch Coverage and Decision Coverage. The differences between Retesting and Regression testing

1. General JAVA questions like: - difference b/w abstract class and interface - difference b/w overriding and overloading 2. What is BDD and TDD (difference) 3. What tool you will be use for back/front end testing... 4. One programming task: Image you have a string with integers, letters, special characters....You need to retrieve only integers and if it is odd -> 'It is a odd', else (even) - > 'It is an even'
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Senior QA Automation

Interviewed at EPAM Systems

4★
Nov 9, 2016

1. General JAVA questions like: - difference b/w abstract class and interface - difference b/w overriding and overloading 2. What is BDD and TDD (difference) 3. What tool you will be use for back/front end testing... 4. One programming task: Image you have a string with integers, letters, special characters....You need to retrieve only integers and if it is odd -> 'It is a odd', else (even) - > 'It is an even'

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