1. Categories >> Aptitude Questions >> Puzzles
  2. Suggest New Category

There are 3 lights (in one room) and 3 swtiches (in another
room), one for each, if you only enter into the light room
once. How can you find out which switch corresponds to which
light?

Question Posted / matthews

Answers were Sorted based on User's Feedback



There are 3 lights (in one room) and 3 swtiches (in another room), one for each, if you only enter ..

Answer / mudassam aslam

first turn one light 1, and keep it on
turn on light 2 and off again so that the bulb gets warm
and turn it off
now enter the room and switch 1 is already on. switch 2
bulb will be warm and remaining switch that ypu havent
touch will be off......its that simple :)

Is This Answer Correct ?    37 Yes 1 No

There are 3 lights (in one room) and 3 swtiches (in another room), one for each, if you only enter ..

Answer / anubhav

Step 1: Switch on 1st switch. Switch it off after 1 minute.
Step 2: Switch on 2nd switch.
Step 3: Go to light room.
Step 4: The light which is on corresponds to 2nd Switch.
Step 5: The light which is warm but switched off
corresponds to 1st switch.
Step 6: The light which is off and not warm corresponds to
3rd switch.

Is This Answer Correct ?    11 Yes 0 No

There are 3 lights (in one room) and 3 swtiches (in another room), one for each, if you only enter ..

Answer / megha

first turn on switch 1 and wait for 5-10min then switch off
that and turn on the switch2 then go to room, if bulb is on
the switch2 is the required switch ,if it is in off
condition then touch the bulb if it is warm then the
required switch is 1,else the required switch is 3.

Is This Answer Correct ?    4 Yes 1 No

There are 3 lights (in one room) and 3 swtiches (in another room), one for each, if you only enter ..

Answer / sharon

3 swithes and 3 lights.
first switch on the first swith and leave it for 10 min.
sec switch on the 2nd switch and enter the room.
the light which is glowing ll be correspond to the on
switch.
one which s warmth must corresponds 2 first switch.
the remaining corresponds to the third switch.

Is This Answer Correct ?    2 Yes 0 No

There are 3 lights (in one room) and 3 swtiches (in another room), one for each, if you only enter ..

Answer / hasan

very good answer mudassam

Is This Answer Correct ?    2 Yes 1 No

There are 3 lights (in one room) and 3 swtiches (in another room), one for each, if you only enter ..

Answer / rajeswari

step 1:put the first swith for 5 minutes
srep2: then off the first swith and put the second switch
step3:now go to other rooom
step4:the bulp which was hot is for first switch
step 5: glowing bulp is for second switch another one is for
third switch

Is This Answer Correct ?    1 Yes 0 No

There are 3 lights (in one room) and 3 swtiches (in another room), one for each, if you only enter ..

Answer / pavithra

switch on the first switch
leave it for 10 min
switch on the second
leave it for 5 min
switch on the third one
now enter into the room
the light which is warm is 2nd switch
the light which is cold corresponds to 1st switch
the light which is blowing belongs to the 3rd switch

Is This Answer Correct ?    0 Yes 0 No

There are 3 lights (in one room) and 3 swtiches (in another room), one for each, if you only enter ..

Answer / sindhu

first put the switch 1 and let be for 2 sec it will become warm and touch it like that do all

Is This Answer Correct ?    0 Yes 0 No

There are 3 lights (in one room) and 3 swtiches (in another room), one for each, if you only enter ..

Answer / mei

lights=3
swtiches=3
if i entire in light room one light is on mean that swtich
is corresponting to that light,remaining two is each one ...

Is This Answer Correct ?    1 Yes 6 No

There are 3 lights (in one room) and 3 swtiches (in another room), one for each, if you only enter ..

Answer / manish chouhan

first we on 1 switch and go at light room and check the
bulb. similarly 2&3

Is This Answer Correct ?    2 Yes 7 No

Post New Answer

More Puzzles Interview Questions

If you started a business in which you earned Rs.1 on the first day, Rs.3 on the second day, Rs.5 on the third day, Rs.7 on the fourth day, & so on. How much would you have earned with this business after 50 years (assuming there are exactly 365 days in every year)?

7 Answers   Infosys,

A cube is divided into 125 pieces.. then four columns are removed then coloured all side black.. i) how many 0 side painted cubes? ii) how many 1 side painted cubes? iii) how many 2 side painted cubes? iV) how many 3 side painted cubes? V) how many 4 side painted cubes?

7 Answers   Stairway Engineering, Tata Elxsi,

Mr. Black, Mr. White and Mr. Grey were chatting in the Yahoo conference. They were wearing a black suit, a white suit and a grey suit, not necessarily in the same order. Mr. Grey sent message, "We all are wearing suit that are of the same color as our names but none of us is wearing a suit that is the same color as his name." On that a person wearing the white suit replied, "What difference does that make?" Can you tell what color suit each of the three persons had on?

2 Answers  

A number of 9 digits has the following properties: ? The number comprising the leftmost two digits is divisible by 2, that comprising the leftmost three digits is divisible by 3, the leftmost four by 4, the leftmost five by 5, and so on for the nine digits of the number i.e. the number formed from the first n digits is divisible by n, 2<=n<=9. ? Each digit in the number is different i.e. no digits are repeated. ? The digit 0 does not occur in the number i.e. it is comprised only of the digits 1-9 in some order. Find the number.

10 Answers   Citrix, HM Solutions, Wipro,

There is a safe with a 5 digit number as the key. The 4th digit is 4 greater than the second digit, while the 3rd digit is 3 less than the 2nd digit. The 1st digit is thrice the last digit. There are 3 pairs whose sum is 11. Find the number.

2 Answers  




can you work well under deadlines or pressure?

1 Answers   Academy Of Aerospace Aviation, Qatar Airlines,

A circle of a playground is to be fenced at circumference.The cost of the fencing is Rs.150 per sqm. what is the total cost , if the diameter is 70?

24 Answers   HCL, RRB, TCS,

Please send SBI Model exam question Paper for Clerical exam sir

2 Answers  

In training for a competition, you find that swimming downstream (with the current) in a river, you can swim 2 miles in 40 minutes, & upstream (against the current), you can swim 2 miles in 60 minutes. How long would it take you to swim a mile in still water?

2 Answers  

Four men - Abraham, Bobby, Clinton and Denial - are standing in a straight line. 1. One man is fair, handsome and unscarred. 2. Two men who are not fair, are each standing next to Abraham. 3. Bobby is the only man standing next to exactly one handsome man. 4. Clinton is the only man not standing next to exactly one scarred man. Who is fair, handsome and unscarred?

5 Answers  

At 6o'clock ,a watch strokes 6 times.The time between first and last is 30secs.At midnight 12o' clock how much time for all strokes?

0 Answers   Infosys,

Mrs. F has invited several wives of delegates to the United Nations for an informal luncheon. She plans to seat her 9 guests ina row such that each lady will be able to converse with the person directly to her left and right. She has prepared the following list. Mrs. F speaks English only. Mrs. G speaks English and French. Mrs. H speaks English and Russian. Mrs. J speaks Russian only. Mrs. K speaks English only. Mrs. L speaks French only. Mrs. M speaks French and German. Mrs. N speaks English and German. Mrs. O speaks English only. How many distinct seating arrangements are possible? Give all possible seating arrangements. Note that ABCD and DCBA are the same.

1 Answers  

For more Puzzles Interview Questions Click Here
Categories