Q.) There are three light bulbs on the second floor of a building and there are three switches on the ground floor which are used to turn on the light bulbs (one switch turns on one bulb).
A man is on the ground floor and he knows that the three light bulbs on the second floor are all turned off. How can he just goes up to the second floor ONCE to determine which switches control which light bulbs ??Ans.) First, turn on one of the switch for a long time, e.g. 20 minutes, then switch it off, then turn on another switch, then immediately go to the second floor.
On the second floor, see which light bulb is turned on. that light bulb corresponds to the switch which is turned on at last.
Sense the two light bulb which is not turned on, see which one is hotter, the one which is hotter corresponds to the switch which has been turned on for a long time but turned off subsequently.

Q.) How to put ten identical balls on a surface so that you can have 5 lines of balls with four balls on each line?
Hint : - Draw it 

Ans.) 

4. Which one of the sets of letters below can be arranged into a five letter English word.

A. A T R U N
B. P O D E B
C. R N A S L
D. M O H A T
E. E T L R N

Ans.) C. SNARL

 Q)Which number should come next in this series? 25,24,22,19,15 ?
A) 10

Q)Which company began as ‘Precision Optical Instruments Laboratory’?
A)Canon

Q)What is the term used to refer to one billon gigabytes? 

A)Exabyte

Q)There are 8 Apples on the table, you take 3. How many do you have?
A) If you take 3 you have 3.