It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

What is the largest number you can write with just 3 digits?

What is so fragile that saying its name breaks it?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Identify the hidden meaning behind this picture?