Yes, they do. Just as cars, do in tanks.
Helicopters carry from 1 - 90 passengers
The type of fuel is specific to the type of engine, not the aircraft. Helicopters that have jet engines use jet fuel, and helicopters that have internal combustion engines use gasoline. However the General Electric T-58 had a device in the fuel control that allowed you to burn just about anything from avgas to jet fuel to kerosene.
Gasoline or Jet 'A'
yes there are helicopters which can dump fuel. the most basic helicopter allouette ( the french single engine helicopter) has a capability of jettisoning fuel at the rate of 130 lts per hr.
yes, there are but it depends what you mean. there are helicopters that can land on water, carry water(firefighter helicopter),amphibious helicopter,etc...
Yes, helicopters can carry firefighters to forest fires. They are often used to transport firefighters to remote or inaccessible areas where the fire is burning. Helicopters can also be used to drop water or fire retardant on the fire to help suppress it.
There are so many small and medium helicopters there is no such thing as "regular" . Most helicopters other than large military ones, carry between 4 and 8 passengers.
Search and rescue helicopters do not carry weapons as military aircraft do. They are built for only search and rescue.
most of them use standard military jet fuel
Those are firebuckets
There are many different helicopters, the biggest can carry over 100 passengers. Most commercial helicopters seat about 16-20 passengers
Most helicopters used a kerosene based fuel, such as Jet A, Jet B, or - in the case of military aircraft of NATO countries - JP-8. However, helicopters which use internal combustion engines will use standard 100 Low Lead petrol fuel.