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Monday, January 11, 2010


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

3. You r given a thermometer. What can u do by this without measuring the
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?
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 measure height of building when you are at the top of the building?

And if you have stone with you.
Ans: Drop the stone and find the time taken for the stone to reach the ground. find
height using the formula
s = a + gt ( s = height, a= initial velocity=0, g=9.8m/s, t = time taken)

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.
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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