I’m tall when I’m young, and I’m short when I’m old. What am I?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

What is the next number in this series?

4,12,84,3612....

I am the fastest animal but cannot climb the tree. What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?