Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

The dirtier I get, the whiter I look. Who am I?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

What has hands, but can’t clap?

How many letters are in the alphabet?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?