It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

Replace the question mark with the correct number below.

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

What kind of band never plays music?

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

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

I taste better than I can smell. Who am I?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.