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

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Why 1729 is a magic number? Answer Logically.

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

If an electric train is travelling south, then which way is the smoke going?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

What has many keys but can’t open a single lock?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?