Lighting | MCQs

Explanation

A Light Emitting Diode (LED)

A light-emitting diode is a semiconductor device that emits light when current flows through it

LED lighting products produce light up to 90% 

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Invented:

H. J. Round (1907);

Oleg Losev (1927);

James R. Biard (1961);

Nick Holonyak (1962)

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First production: October 1962

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VU FIA CBT  14-12-2021

ND5-5-2023

Explanation

Perhaps one of the most spectacular of Olympic cauldron lighting ceremonies took place at the 1992 Summer Olympics, when Paralympic archer Antonio Rebollo lit the cauldron by shooting a burning arrow over it, which ignited gas rising from the cauldron.

Explanation

It was so dark that you could not see your hand.

that you could not see your hand, modifies the adjective - so dark.

Here the above-given part is an adverb clause

because it tells us 'how much dark' 'Ii' i.e. the subject in the main clause, 'was'.