What has hands, but can’t clap?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

What do you call a fish without an eye?

What kind of storm is always in a rush?

Count the number of squares in the picture below.

What work can one never finish?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?