What goes up but never comes down?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Which is the correct shadow of the bird?

What 5-letter word typed in all capital letters can be read the same upside down?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

What's the only room from which no one can enter or leave

What is the difference between a jeweller and a jailer?

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

Take one out and scratch my head, I am now black but once was red. What am I?