Which number should replace the question mark?

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

Which number comes next in the number series?

2, 9, 30, 93, ?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

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?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

Count the number of triangles in the picture below:

Identify The phrase in the picture.

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

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.