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

Which five letter word can be added at the end of below word to form a
valid word?

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

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?