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?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

They are three errirs in this question. Can you find them?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

I have no life, but I can die. What am I?

What 5-letter word typed in all capital letters can be read the same upside down?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?