Can you find out the remainder when 3^300 is divided by 5?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

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

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

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?

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

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?