Why is the Hole below a Lock?

What demands an answer, but asks no questions

You can hear me, but you can't touch or see me.

What am I?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

In which direction should the missing arrow point?

Who has married many women but was never married?

What is the next number?

77, 49, 36, 18 ?

What's the only room from which no one can enter or leave