1.Which of these statement about the abacus is false?
(1) It is a mechanical device.
(2) It was invented in China.
(3) It involved counting in 0 and 1.
(4) It contains beads that we can slide for counting.
2. Which of these devices is a cylinder shaped piece of metal coated with a chemical to store data?
(1) Vaccum tubes
(2) Magnetic drum
(3) Abacus
(4) Tabulating machine
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Answer:
1. Ans- It is a mechanical device. (1)
2. Magnetic drum. (2)
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