The term 'airship' generally refers to a dirigible, or blimp. These are aircraft which are kept aloft by the lifting force of a gas, usually helium, which is lighter than air. Such aircraft are very large for the number of people they car carry, and extremely difficult to operate in windy conditions. Most police forces that employ aircraft use helicoptors, and some use fixed wing aircraft.
Some police departments refer to their helicopters as airships, even though they're not truly airships. It's just a nickname.
Airships do use gas, to provide lift.
Not, usually most of the time the railroads have their own police.
A police inspector quizzes suspects as part of his duties.
Guard dogs, attack dogs and police/security duties
The function of the police is to prevent and control crime in societies.
Modern airships use Helium for lift which is non-combustible whereas in the past airships such as the Hindenburg used Hydrogen for lift which is highly combustible. In addition, modern airships take advantage of new alloys and polymers which give them a much stronger airframe.
That'd be hydrogen.
the police officer save and help people in danger.
The duties and responsibilities of a police man are to protect and serve his/her city.
Neither the police nor judges have duties regarding settling disputes. The police exist to protect citizens and to enforce the law. Judges' duties are in adjudicating criminal and civil cases that cannot be settled.
It is a physical fitness test to ensure a police officer is capable of carrying out his or her duties. The details of which will vary according to country and duties.
Helium is used for inflating balloons and dirigible airships.