Can you make a six-letter word using the letters N, A and B ?

Can you place six X (crosses) in below board without making three in a row in any way ?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

Find the next number in the series below

21 32 54 87 131 ?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?