Discussion
The type of screen used in gaming devices, clocks, watches, calculators and telephone is
Answer: A
The screen is LCD.
Liquid crystal displays are thin, light and use very little power, which is why they are used in digital clocks, watches, calculators, telephones and handheld gaming devices. A calculator or watch can run for months or years on a small battery with an LCD.
Plasma screens were used in large televisions and need much more power, and CRT (cathode ray tube) displays are bulky glass tubes used in old televisions and monitors. Neither fits small, battery-powered devices, so the options containing them are wrong.
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