The most recent ten F5/EF5 tornadoes are:
A little more than 1% of tornadoes are rated F4 and F5 with F5 tornadoes being less than 0.1%
No, the majority of tornadoes in the US are not classified as F5. F5 tornadoes are extremely rare and account for only a small percentage of all tornadoes. Most tornadoes in the US are classified as weaker tornadoes, such as F0 to F2.
Not in a single outbreak. The current record for number of F5 tornadoes in a single outbreak is 6, (some say 7 as one rating is disputed) which is also the 1-year record. You might see 90 F5 tornadoes occur in a 100 year period.
Oklahoma has had the most F4 and F5 tornadoes. Though it is tied with Texas, Iowa, and Alabama in terms of F5 tornadoes in the past 60 years.
There were no F5 or EF5 tornadoes in 2010.
There have been several dozen F5 tornadoes since record began in 1950. F5 the highest level on the Fujita scale which runs from F0 to F5 and rates tornadoes based on the severity of the damage they cause. A rating of F5 denotes an extremely violent tornado that rips houses clean of their foundations. F5 tornadoes are typically large and have been known to destroy entire towns. They are absolutely devastating. The majority of the most famous tornadoes were F5's, though a few F4 tornadoes have made it onto the list.
About .05% of all tornadoes are rated F5 or EF5. Or, in other terms, about 1 tornado in every 2000.
If you are referring to the diameter of an F5 tornado then there is no definite answer. Size is not a factor in rating tornadoes. Tornadoes are rated based on how bad their damage is. In the case of F5 tornadoes, that means houses must be completely swept away. F5 tornadoes have been recorded at a variety of sizes ranging from 60 yards to 2.3 miles.
There have been estimated at least 109 F5 tornadoes in the U.S. Since the introduction of the Enhanced Fujita scale there have been 9 EF5 tornadoes, which is essentially equivalent to an F5. Note that this number should be taken with a grain of salt as it can be difficult to distinguish between F4 and F5 damage, especially in records that must be evaluated based on historical accounts.
There have been dozens of F5 tornadoes, you will need to be more specific.
In most cases an F5 tornado will be larger than an F1. However, tornado ratings are a measure of the strength of a tornado, not its size. F5 is the strongest category, and such tornadoes are usually very large, but a few have been fairly small. Conversely, F1 is the second lowest rating (F0 is the lowest) and such tornadoes are generally small, but some have been huge.
To date, no town in Texas has been hit by two F5 tornadoes. Worth mentioning, though is the town of Wichita Falls, Texas. It was hit by an F5 tornado on April 3, 1964 and an F4 tornado on April 10, 1979. The second tornado is the more famous of the two and is incorrectly believed by some to have been an F5.