Why Aeroplane windows are round?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

If two's company, and three's a crowd, then whats four and five ?

John needs to purchase 100 chocolates from three different shops and he has exactly 100 rupees to do that which he must spend entirely. He must buy at least 1 Chocolate from each shop.

The first shop is selling each chocolate at 5 paise, the second is selling at 1 rupee and the third is selling at 5 rupees.

How many chocolates should he buy from each shop?

Can you find out the remainder when 3^300 is divided by 5?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

Find the next number in the sequence

5 12 24 36 ?

What has no start, end, or centre?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.