difference between show sth and unveil sth

[Annaa]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #40 "The News", question 1

Here is the news read by Alan Townend. Today the Government is ......... plans for a new scheme to help society.

(a) opening
(b) unveiling
(c) undoing
(d) showing

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #40 "The News", answer 1

Here is the news read by Alan Townend. Today the Government is unveiling plans for a new scheme to help society.

Correct answer: (b) unveiling
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what's main difference between show sth and unveil sth?

[Mister Micawber]

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'Unveil' suggests a ceremonial showing; it is done with some pomp, and often includes a real veil-- a cloth covering the surprise. Here, of course, 'unveil' is metaphoric; no cloth concealed the new plans before their unveiling, though they were possibly under lock and key.
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Native English teacher at Mister Micawber's