Which is faster, Heat or Cold ? Explain.

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

What happened when the wheel was invented?

Do You See It?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

I left my campsite and hiked south for 3 miles. Then I turned east and hiked for 3 miles. I then turned north and hiked for 3 miles, at which time I came upon a bear inside my tent eating my food! What colour was the bear?

Different lights make me strange by changing me into different sizes. What am I?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145