How many words can a pen with half refill write?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

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

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

How many letters are in the alphabet?

Move three sticks of the spiral below to form a square.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

500 women soldiers are arranged in an array of ten rows and fifty columns in accordance with their respective heights. Now, the tallest woman from each row is asked to move out in the front. From them, the shortest one is labelled as Alpha. They are then asked to resume their original position.

Now, the shortest woman in each column is asked to come out in front. The tallest among them is labelled as Beta.

Can you find out if Alpha will be taller or Beta?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Count the squares in the matchstick puzzle below?