Can you identify the hidden rebus in the image below?

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?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

Why is it very easy to weigh a fish?

Solve the counting riddle by identifying the number of triangles in the given picture.

My location can be determined by the below rebus.
So where am i ?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What has a ring but no finger?