what does this picture(rebus) riddle means ?

I don't get anymore wetter, no matter how much rain falls on me.

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

I’m tall when I’m young, and I’m short when I’m old. What am I?

What is the longest word in the dictionary?

When it is alive we sing, when it is dead we clap our hands. What is it?

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

what does the below math rebus puzzle mean?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What is full of holes but still holds water?