I am quite hot but become too cold if you remove the first two letters. What am I?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

Find the Goldfish below the given Image.

There are 100 bulbs in a room. 100 strangers have been accumulated in the adjacent room. The first one goes and lights up every bulb. The second one goes and switches off all the even-numbered bulbs - second, fourth, sixth... and so on. The third one goes and reverses the current position of every third bulb (third, sixth, ninth? and so on.) i.e. if the bulb is lit, he switches it off and if the bulb is off, he switches it on. All the 100 strangers progress similarly.

After the last person has done what he wanted, which bulbs will be lit and which ones will be switched off?