What is the Surname of Barbie Doll?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

Replace the question mark with the correct number in below Picture:

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

Rose, Lily and Jasmine decided to buy flowers for their moms on Mother's Day. One of them bought lilies, the other roses, and the third one jasmines.
'It's funny!' said the girl with roses, 'we bought roses, jasmines and lilies, but none of us bought the flowers matching her name'.
'You're right!', said Lily.
What kind of flowers did each of the girls buy?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

What kind of storm is always in a rush?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

What breaks yet never falls, and what falls yet never breaks?