I have branches, but no fruit, trunk or leaves. What am I?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

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

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Spot what is wrong here in below Picture?

If your uncle’s sister is not your aunt, what relation is she to you?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

A man is found hanging dead from the ceiling of a room. The room’s dimensions are 15 x 15 x 15. The man is only 6ft tall and the rope was only 2ft long. There are no windows and only one door to the room. The door is bolted shut from the inside, and a puddle of water is under the man. How did he kill himself?

What do you see in the image below