John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Which flower has two lips?

Decode below rebus
D
N
A
T
S , D

You can see it everyday, But cannot touch it at will. What is it?

Find the hidden panda in the image below.

Why is the Hole below a Lock?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?