The World Metrology Day is observed every year on _____ date ?

a) 19th May
b) 20th May
c) 21th May
d) 22th May

World Metrology Day is observed every year on 20 May to commemorate the signing of the Metre Convention in 1875. The theme of the 2019 World Metrology Day was ‘The International System of Units – Fundamentally better’.

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