Question 1:

Who is credited with inventing the modern helicopter?

Explanation: Igor Sikorsky is credited with inventing the modern helicopter.

Question 2:

What is the main function of a helicopter's tail rotor?

Explanation: The main function of a helicopter's tail rotor is to counteract torque.

Question 3:

Which of the following helicopters was the first to be mass-produced?

Explanation: The Sikorsky R-4 was the first helicopter to be mass-produced.

Question 4:

What is the term used for the ability of a helicopter to take off and land vertically?

Explanation: The term used for the ability of a helicopter to take off and land vertically is Vertical takeoff and landing (VTOL).

Question 5:

Which helicopter is commonly used for medical evacuations and rescue operations?

Explanation: The AgustaWestland AW139 is commonly used for medical evacuations and rescue operations.