What you cannot hold but it is yours?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

How many triangles can you find in this given picture?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

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.

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

what does this picture(rebus) riddle means ?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145