Neither of them is silent because they can't be seen as individual characters but rather a digraph. A digraph is a pair of characters used to write a single phoneme. In this particular case the digraph represents the phoneme /s/. Other examples include "scene", "science" or "scissors". These words usually have roots in the Old French or Greek languages.
Sometimes the digraph represents a /sh/ sound. These words often have Italian or Germanic origins. They include "conscious", "eschew", or "fascism".
Please note that the letter combination also works as a consonant blend in some words. In those cases it is NOT a digraph since both consonants can be heard individually. Examples are "scar", "scheme", or "school".
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"Ask FunTrivia" strives to offer the best answers possible to trivia questions. We ask our submitters to thoroughly research questions and provide sources where possible. Feel free to post corrections or additions. This is server B184.