Why Aeroplane windows are round?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

Which alphabet letter is a question?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

What has lots of eyes, but can’t see?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?