Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

What can go up a chimney down, but can’t go down a chimney up?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

I make two people out of one. What am I?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

I cannot talk, but I always reply when spoken to. What am I?

It is always ahead of me yet I can never see it. What is it?

They are three errirs in this question. Can you find them?