What does this rebus mean?

O
N
C
E
TIME

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

I am quite hot but become too cold if you remove the first two letters. What am I?

Bay of Bengal is in which state?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

Why is the Hole below a Lock?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

What Deficiency does the below rebus represent?

VIT_MIN