What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Which five letter word can be added at the end of below word to form a
valid word?

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A spy was in Canada trying to steal insider information on how to set up new Maple Syrup factories in their country. He was introduced to the operations manager of the biggest factory in Canada. However, the manager was suspicious and decided to test him with a question before he trusted him. So he asked, “What would you be sure to find in the middle of Toronto?” The spy thought fast and came up with an answer for the manager. What was his answer?

What is the Surname of Barbie Doll?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

No matter how little or how much you use me, you change me every month. What am I?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

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

Bay of Bengal is in which state?