If it took eight men ten hours to build a wall, how long would it take four men to build it?

When we see 2 but call 10?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

I am quite hot but become too cold if you remove the first two letters. What am I?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

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?

What is both possible and impossible at the same time?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

What country can make you shiver?