Question
A light bulb is hanging in a room. Outside of the room there are three sitches, 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?
Answer
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To find the correct switch(1,2, or 3), turn switch 1 to 'on' and leave it like that for a few minutes. After that you turn switch 1 back to 'off', and turn switch 2 to 'on'. Now enter the room. If the light bulb is lit, then you know that switch 2 is connected to it. If the bulb is not lit, then it has to be switch 1 or 3. Now touching for short the light bulb, will give you the answer: If the bulb is still hot, then swith 1 was the correct one; if the bulb is cold, then it has to be switch 3.
From India, Madras
1A light bulb is hanging in a room. Outside of the room there are three sitches, 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?
Answer
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
To find the correct switch(1,2, or 3), turn switch 1 to 'on' and leave it like that for a few minutes. After that you turn switch 1 back to 'off', and turn switch 2 to 'on'. Now enter the room. If the light bulb is lit, then you know that switch 2 is connected to it. If the bulb is not lit, then it has to be switch 1 or 3. Now touching for short the light bulb, will give you the answer: If the bulb is still hot, then swith 1 was the correct one; if the bulb is cold, then it has to be switch 3.
From India, Madras
BRAIN TEASERS
1. What is the easiest way to throw a ball, have it stop, and
completely reverse direction after traveling a short distance?
2. What is at the beginning of eternity, the end of time, the
beginning of every end, and the end of every place?
3. When things go wrong, what can you always count on?
4. What is always behind you but you can never touch it?
5. I am never the first to speak but I am always the last to be
heard. Who am I?
6. We were born of the same mother, on the same day, at the same
hour and in the same year. Yet we are not twins. How do you explain this?
7. Two fathers and two sons were seated round a table. There were
four apples on the table. Each of them took one apple and ate it entirely
yet there was still one apple left on the table. How was this possible?
8. Before Mount Everest was discovered which was the highest
mountain in the world?
9. Here everything is not always in order. For example, Friday comes
before Thursday, the cart comes before the horse, the driver comes before
the employer. Where are we?
10. When I am alive I stay put where I am. It is only when I am dead
that I move about here and there. Who am I?
11. How can you be behind a person when that person is also behind you?
Answers below
1. Throw the ball straight up
2. 'e'
3. Your fingers
4. The past
5. An echo.
6. They are triplets.
7. There were only three persons at the table comprising a
grandfather, his son and his grandson.
8. Mount Everest, of course. It was always there!
9. In a dictionary.
10. A leaf.
11. Put yourself back to back of each other
From India, Mumbai
1. What is the easiest way to throw a ball, have it stop, and
completely reverse direction after traveling a short distance?
2. What is at the beginning of eternity, the end of time, the
beginning of every end, and the end of every place?
3. When things go wrong, what can you always count on?
4. What is always behind you but you can never touch it?
5. I am never the first to speak but I am always the last to be
heard. Who am I?
6. We were born of the same mother, on the same day, at the same
hour and in the same year. Yet we are not twins. How do you explain this?
7. Two fathers and two sons were seated round a table. There were
four apples on the table. Each of them took one apple and ate it entirely
yet there was still one apple left on the table. How was this possible?
8. Before Mount Everest was discovered which was the highest
mountain in the world?
9. Here everything is not always in order. For example, Friday comes
before Thursday, the cart comes before the horse, the driver comes before
the employer. Where are we?
10. When I am alive I stay put where I am. It is only when I am dead
that I move about here and there. Who am I?
11. How can you be behind a person when that person is also behind you?
Answers below
1. Throw the ball straight up
2. 'e'
3. Your fingers
4. The past
5. An echo.
6. They are triplets.
7. There were only three persons at the table comprising a
grandfather, his son and his grandson.
8. Mount Everest, of course. It was always there!
9. In a dictionary.
10. A leaf.
11. Put yourself back to back of each other
From India, Mumbai
Hi Sunanya,
Your brain teasers were awesome and very exciting to work on :) Please keep posting some more. BTW, can you suggest any links where I could find some good brain teasers for my employees?
Thank you,
Padmaja
From India, Pune
Your brain teasers were awesome and very exciting to work on :) Please keep posting some more. BTW, can you suggest any links where I could find some good brain teasers for my employees?
Thank you,
Padmaja
From India, Pune
Thanks you for brain storming questions with answers. Here is a game where the positions of the frogs are to be interchanged. Please be fair to inform the readers about the no of attempt you need to do that.
It is not created by me or I do not know who has created. I must thank the unknown creator of this game.
Thank you all
Mujib
It is not created by me or I do not know who has created. I must thank the unknown creator of this game.
Thank you all
Mujib
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