What is so fragile that saying its name breaks it?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Solve below rebus puzzle?

Can you decipher the below rebus?

PBLUESAISNUERSES

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?