What is the word or phrase?

It belongs to you, but other people use it more than you do. What is it?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Can you count the number of squares in the figure below?

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

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