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

If six children and two dogs were under an umbrella, how come none of them got wet?

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

I am white when I am dirty, and black when I am clean. What am I?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

Before Mount Everest was discovered, what was the highest mountain in the world?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

John was piloting a plane behind a car but was never able to overtake it. Why?