Q 01/05

Bluetooth is named after a 10th-century king of which country?

A) Finland

B) Sweden

C) Iceland

D) Denmark

Answer · why

D) Denmark

Denmark's Harald Bluetooth also brought Norway under his crown, and that record of joining rivals is why engineers borrowed his nickname for a standar...

Q 02/05

The Bluetooth logo joins two characters from which old writing system?

A) Greek letters

B) Egyptian hieroglyphs

C) Norse runes

D) Celtic ogham

Answer · why

C) Norse runes

Norse runes for H and B, the initials of the Viking king who gave the technology its name, are laid over each other to form the symbol.

Q 03/05

Bluetooth radios operate in which frequency band?

A) 900 MHz

B) 2.4 GHz

C) 5 GHz

D) 60 GHz

Answer · why

B) 2.4 GHz

2.4 GHz is one of the few bands left open to unlicensed radios almost everywhere in the world, so one Bluetooth design works from country to country a...

Q 04/05

The low-power radios in typical Bluetooth earbuds are designed to reach roughly how far?

A) About 1 metre

B) About 10 metres

C) About 100 metres

D) About 1 kilometre

Answer · why

B) About 10 metres

About 10 metres is the design range of the Class 2 radios in most earbuds, which transmit at only 2.5 milliwatts to save power, and walls between the ...

Q 05/05

Which kitchen appliance can make Bluetooth audio stutter whenever it is running?

A) An induction hob

B) An electric kettle

C) A dishwasher

D) A microwave oven

Answer · why

D) A microwave oven

A microwave oven heats food with radio waves at almost the same frequency Bluetooth uses, and the little that escapes its metal shielding can drown ou...