Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

Which digit occurred maximum times between the number 1 and 1000?

What is wrong in the below Picture?

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

If an electric train is travelling south, then which way is the smoke going?

What does this rebus mean?

O
N
C
E
TIME

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)