Why Wine Glass Stem is so long?

There are 100 bulbs in a room. 100 strangers have been accumulated in the adjacent room. The first one goes and lights up every bulb. The second one goes and switches off all the even-numbered bulbs - second, fourth, sixth... and so on. The third one goes and reverses the current position of every third bulb (third, sixth, ninth? and so on.) i.e. if the bulb is lit, he switches it off and if the bulb is off, he switches it on. All the 100 strangers progress similarly.

After the last person has done what he wanted, which bulbs will be lit and which ones will be switched off?

There are two dice with empty faces in front of you and a marker. You can mark any number on each of the faces of the two dice, but you have to display all 31 days of the month using the two of them.

Which numbers will you mark on which dice so that you can easily depict all the dates of the month?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

What is black when you buy it, red when you use it, and gray when you throw it away?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Which point will the car reach to go out?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Which of the below owl is odd one out?