book no.4 part 1(1)

What made rocket mail unreliable as a way to send letters?

• It was too slow
• It cost too much in postage
• It often exploded
• It needed pilots
• It got wet in rain

What makes maglev trains move smoothly?

• Gas power
• Magnetic levitation
• Jet engines
• Strong tracks
• Wind tunnels

What was the main problem with flying cars in everyday use?

• They were too quiet
• They needed to fly over water
• They were expensive and needed runways
• They looked too much like planes
• They were banned in cities

Why did people stop using Zeppelins?

• They sank
• They were too slow
• They used flammable gas
• They were too small
• They flew too low

What helps ground-effect vehicles fly low over water?

• Rubber cushions
• Water jets
• Air cushions
• Hover fans
• Sea air

Why did Concorde flights end?

• They flew too low
• They weren’t fast enough
• They were too loud and costly
• People didn’t like airplanes
• They used gas from space

Why was nuclear propulsion never used for planes?

• It wasn’t fast
• It made too much smoke
• It was too radioactive
• It wasn’t exciting
• It didn’t work in space

What caused the Hindenburg disaster?

• Strong winds
• A lightning strike
• Hydrogen explosion
• A fire on the ground
• A magnet crash

Why is the metaverse not used as much today?

• Too many people joined
• Headsets are expensive and boring
• People prefer to work in VR
• It was taken down by the government
• It was only for games

What animal might have received burnt rocket mail by accident?

• Dogs
• Horses
• Cows
• Sheep
• Cats