BBC How to Make - Headphones

How many pairs of headphones per second are sold worldwide?

• 10

• 12

• 14

• 20

Who invented the first speaker, as part of the first telephone?

• Thomas Edison

• Charles Darwin

• Alexander Graham Bell

• Norman Telephone

When was the first speaker, in the first telephone, invented?

In 1881 Ezra Gilliland attached speakers onto a headband for use where?

• On public transport

• In telephone exchanges

• In flights

• Beside noisy family members

The speaker enclosures in early headphones were made from which polymer that was invented in 1809?

• Bakelite

• PVC

• ABS

• Acrylic

In which year did John Koss release the first stereo headphones?

What was the name of the first personal stereo cassette player, released by Sony in 1979?

• CassettePod

• MP1 Player

• Walkman

• Boombox

How much did the headphones created by Sony for their first personal stereo weigh?

Where was Dr Bose when he came up with the idea for noise cancelling headphones?

• On a bus

• On a flight

• Next to a noisy family member

• Out jogging

When was Bluetooth wireless technology first invented?