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WorksheetsBBC How to Make - Headphones
Total questions: 20
Worksheet time: 10mins
How many pairs of headphones per second are sold worldwide?
(a)
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?
(a)
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?
(a)
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?
(a)
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?
(a)
In modern headphones, and the example taken apart in the programme, what material is used for the driver enclosures?
PVC
Bakelite
ABS
Acrylic
Which manufacturing process is used for mass produced headphone driver enclosures?
Vacuum Forming
CNC Machining
Injection Moulding
Blow Moulding
Which two of the following are given as important properties of the plastic used in headphone manufacture
A good heat conductor
Shock absorbent
A good electrical conductor
Scratch Resistant
Waterproof
What are the three main parts of a speaker driver?
Disc drive
Coil
Battery
Magnet
Membrane
Which of the following are described as interfering with Bluetooth signals
Noisy family members
Rain or water
Sunlight
Birds
The Plastidip coating used to cover the wires consists of which polymer?
PVC
ABS
Acrylic
Bakelite
Which two metals are described as good choices for the connecting wires?
Copper
Steel
Lead
Silver
What is the name of the 'echo free' room used to test audio products
A panic room
An anechoic chamber
An anaerobic respirator
A quiet room
Which material do Bowers and Wilkin use inside the headband of their professional headphones, to reduce the transfer of sound between left and right earphones?
ABS plastic
Aluminium
Asbestos
Ash wood
Which of the following materials are not used in Zoe's final prototype headphones?
Silk
Memory Foam
Bakelite
PVC coated Copper Wire
Aluminium
