Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

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

In the four images below, can you find the odd one out?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

What is full of holes but still holds water?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

Count the number of squares in the picture below.

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.