I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

What brings you down but never up?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

Find the next number in the following series:
6, 14, 26, 98, __?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?