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

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'.