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?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

What does the below rebus riddle means?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

From a pack of 52 cards, I placed 4 cards on the table.

I will give you 4 clues about the cards:

Clue 1: Card on left cannot be greater than the card on the right.
Clue 2: Difference between the 1st card and 3rd card is 8.
Clue 3: There is no card of an ace.
Clue 4: There are no face cards (queen, king, jacks).
Clue 5: Difference between the 2nd card and 4th card is 7.

Identify four cards?

Find the number of squares in the below-given picture.

Take one out and scratch my head, I am now black but once was red. What am I?

What number do you get when you multiply all of the numbers on a telephone's number pad?

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

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?