If at first you failed

Rocket Mail was an experimental method of delivery that primarily failed because:

• Rockets couldn’t carry enough weight

• People preferred drones

• It was too dangerous and inaccurate

• It took too long to arrive

Which major challenge has prevented flying cars from becoming mainstream?

• Lack of interest in personal aviation

• Air pressure differences at low altitudes

• Inability to take off vertically

• Safety, regulation, and airspace management

What makes maglev trains different from conventional trains?

• They use rubber tires on magnetic roads

• They are powered by wind and solar

• They float above tracks using magnetic levitation

• They only operate underground

The decline of zeppelins as passenger aircraft was primarily due to:

• Competition from helicopters

• Short range

• Fuel inefficiency

• Safety concerns, especially with hydrogen use

Suspension railways differ from regular railways because:

• They are underwater

• The train cars hang below the track

• They can fly short distances

• They run without electricity

Ground-effect vehicles are limited in use because they:

• Can’t carry passengers

• Are too noisy for cities

• Are only effective when flying close to flat surfaces

• Require nuclear fuel

Which of the following was a real supersonic transport used for commercial travel?

• Falcon 9

• The Zeppelin II

• Concorde

• Boeing 737 Max

What is a key reason nuclear propulsion is considered for space travel?

• It is safer than chemical rockets

• It produces no radiation

• It is the only way to travel faster than light

• It enables longer missions without refueling

Hyperloop systems are designed to:

• Replace taxis in small cities

• Provide virtual experiences

• Transport passengers at high speed in vacuum tubes

• Fly autonomously over water

Hydrogen vehicles emit which byproduct when used as fuel?

• Carbon dioxide

• Nitrogen

• Methane

• Water vapor