They believed it was necessary to test because they wanted to be sure they would work if (perhaps when) they would be used. They were tested in the Pacific because it was far from any inhabited or important lands and so fallout was not an issue.
when France wanted to do what testing of a nuclear bombs on Moruroa island in the south pacific
The United States tested atomic bombs primarily at the Nevada Test Site, now known as the Nevada National Security Site, starting in 1951. Additionally, the first atomic bomb was detonated during the Trinity Test in New Mexico on July 16, 1945. Other tests were conducted in the Pacific, particularly at the Bikini Atoll and Enewetak Atoll in the Marshall Islands, during the 1940s and 1950s.
yes
The explosive power of the first test bombs were 20 kilotons.
It was decided in WW2 that it was not necessary to test the Uranium gun bomb design of the MK-I Littleboy. Its first test was in actual combat when it was dropped over Hiroshima. Later Uranium implosion bomb designs were tested both on Bikini Atoll and the Nevada Test Site.
There had already been a test.
Hydrogen bombs have never been used in war. They have only been exploded in test shots.
Einstein did not personally make any atomic bombs, nor was he particularly involved in the Manhattan Project. (He couldn't obtain the necessary security clearance. and scientists in the project were actually forbidden from consulting with him about it.) The names of the first two bombs were "the gadget" and "Little Boy." The gadget was the one used in the Trinity test firing, and was a test of the design used for the third bomb, "Fat Man" (Little Boy was considered a simple enough design to not need a test firing, but the gadget and Fat Man were more complicated.)
I think they are still testing
July 16, 1945 was the first nuclear bomb test by the United States.
Mock test is necessary to see where you stand during preparations.
They only urine test.