What begins with T, ends with T, and has T in it?

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

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

People make me, save me, change me, raise me. What am I?

Buy me, smell me or deliver me, I do not change.

Who am I?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

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.

Rearrange the letters in "new door" to make one word.