I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

A man was telling some of his war stories to his grandchildren.
"When the World War I was on the verge of end, I was awarded for my bravery for I had saved a group of my men." He coughed and then added, "When we were fighting in northern France, an enemy soldier threw a grenade at us. Before it could explode, I picked it up and threw it away. For my act of bravery, right before the war ended, A General gave me a sword engraved with the words "Awarded for Display of Bravery and Heroism in World War 1"."

Hearing this, one of the grandson spoke up. "Grandpa, this is not a true story. It can"t be true!"

The truth is that it was not. How did the grand children know it?

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?

Can it be possible to build a house that has all its four walls facing towards the South?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

What is the largest number you can write with just 3 digits?

Which point will the car reach to go out?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

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

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When can we add 2 to 11 and get 1 as the correct answer?