Why is it very easy to weigh a fish?

When it is alive we sing, when it is dead we clap our hands. What is it?

You need to remove two matchsticks to make the below equation true. Can you do it ?

In which direction should the missing arrow point?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

People put me on the table and cut me but do not eat me. What am I?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

What makes this number unique: 8,549,176,320?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?