Interview Puzzles

1. You Are Given Two Candles Of Equal Size, Which Can Burn 1 Hour Each. You Have 
To Measure 90 Minutes With These Candles. (There Is No Scale Or Clock). Also U R 
Given A Lighter.

Ans: 1. First Light Up The Two Ends Of The 1st Candle. When It Will Burn Out Light Up 
One End Of The Second Candle. (30+60=90)

2. Try The Similar Problem To Measure 45 Minutes.

Ans: First Light-Up The Two Ends Of The 1st Candle And One End Of The 2nd Candle. 

When The 1st Candle Will Burn Out ,Then Light Up The Both Ends Of The 2nd Candle
(15+30=45)

3. You R Given A Thermometer. What Can U Do By This Without Measuring The 
Temperature?

Ans: If U Put Thermometer Into A Tree It Won?T Grow Anymore, Will Just Die Off

4. How It Is Possible To Place Four Points That Are Equidistance From Each Other?

OR
U R A Landscape Designer And Your Boss Asked U To Design A Landscape Such
That You Should Place 4 Trees Equidistance From Each Other. 
(Distance From Each Tree To The Other Must Be Same)

Ans: Only 3 Points Can Be Equidistant From Each Other. But If U Place Points In The 
Shape Of A Pyramid Then Its Possible

5. You Are Given A Cake; One Of Its Corner Is Broken. How Will U Cut The Rest Into
Two Equal Parts?

Ans: Slice The Cake

6. How Will You Recognize The Magnet & Magnetic Material & Non-Magnetic Material?

Ans: Drag One Piece Of Material Over Another. There Is No Attractive Force In The 
Middle Portion Of The Magnet. 

OR
Get A Piece Of Thread And Tie Up With The One Bar And Check For Poles. If It Iron Bar
Then It Moves Freely And If It Is Magnetic Bar Then It Fix In One Direction According To 
Poles.


7. If One Tyre Of A Car Suddenly Gets Stolen.... And After Sometime U Find The Tyre 
Without The Screws How Will U Make Ur Journey Complete?

Ans: Open 3 Screws, 1 From Each Tyre And Fix The Tyre.

8. How Can U Measure A Room Height Using A Thermometer?

Ans: Temp Varies With Height. But Its Dependent On Various Other Factors Like 
Humidity, Wind Etc.

9. What Is The Height Of Room If After Entering The Room With A Watch Ur Head 
Strikes A Hanging Bulb?

Ans: Oscillate The Hanging Bulb. Calculate The Time Period For One Complete 
Oscillation By Simple Harmonic Motion (SHM) Of The Handing Bulb. Put It In The 
Formula T=2 * 3.14 * (L/G)^1/2 
L Will Be The Length Of The Hanging Thread.
Add The L With Ur Height To Get The Height Of The Room.

OR
Ans: Drop It From The Room And Find The Time At Which It Strikes The Floor. Using
Physics Formula S = (At^2)/2 (IM NOT SURE ABOUT THIS ONE)

10. Color Of Bear.... If It Falls From 1m Height In 1s.

Ans: We Get 'G' Perfect 10 Which Is Only In Poles...Hence Polar Bear...Color White

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Horse Puzzle

The puzzle is there are 25 horses among which you need to find out the fastest 3 horses. You can conduct race among at most 5 horses to find out their relative speed. At no point you can find out the actual speed of the horse in a race. Find out how many races are required to get the top 3 horses. The answer for this puzzle is given below.

Answer :

         Seven.
The first 5 to find the 3 fastest in each group and the sixth with the winners of each group.Now we know the fastest horse.
The second fastest horse must either be the second fastest in the sixth race or the second fastest horse in the final winners first race.
In the first case, the third fastest horse can either be the third fastest horse in the sixth race or the second fastest horse in either the fastest or second fastest horses first race.
Otherwise the third fastest horse could either be the second fastest horse in the sixth race or the third fastest horse in the final winners first race.
This makes for a total of five horses for the seventh, and final, race.

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HR Puzzle

You have a set of 3 light switches outside a closed door. One of them controls the light inside the room. With the door closed from outside the room, you can turn the light switches on or off as many times as you would like. You can go into the room - one time only - to see the light. You cannot see the whether the light is on or off from outside the room, nor can you change the light switches while inside the room. No one else is in the room to help you. The room has no windows. Based on the information above, how would you determine which of the three light switches controls the light inside the room? Answerfirst any one of the switch and let it be on for 10 min and then close on the another switch and go inside the room if the bulb is lighted then the correct switch is 2 and if the bulb if not lighted but it is hot (feel it by touching) then it is the 1st switch otherwise the 3 rd switch

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