Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

Which alphabet is a part of our body?

In the four images below, can you find the odd one out?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

What is wrong in the below Picture?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?