Alexander Fleming discovered penicillin, the world's first effective antibiotic, in which year? MCQ with Answer and Explanation

Explanation:
Essen and Parry constructed the first highly functional stable cesium atomic clock standard in 1955 at the National Physical Laboratory.

Explanation:
These three physicists invented the point-contact solid-state transistor at Bell Labs in 1947, replacing vacuum tubes.

Explanation:
Werner Heisenberg formulated the principle stating that the position and momentum of a subatomic particle cannot be measured simultaneously with absolute precision.