Why do you find that most of the buildings are deprived of the 13th floor?

What English word has three consecutive double letters?

What type of tree can I carry in my hand?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Find the number of squares in the below picture

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Which five letter word can be added at the end of below word to form a
valid word?

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As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?