Which historical mechanical device featured a grid of sliding beads on wires and was split into a top section ('Heaven') and a bottom section ('Earth')? MCQ with Answer and Explanation
Which historical mechanical device featured a grid of sliding beads on wires and was split into a top section ('Heaven') and a bottom section ('Earth')?
A. Napier's Bones
B. Abacus
C. Pascaline
D. Slide Rule
Answer: Option B
Solution (By JKSSB Mock Tests)
Traditional Chinese abacuses (Suanpan) feature a structural upper deck ('Heaven') and a lower deck ('Earth') for positional base-5 arithmetic.
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