Which early calculating aid invented by John Napier used a set of numbered ivory rods to simplify complex multiplication and division tasks? MCQ with Answer and Explanation

Question

Which early calculating aid invented by John Napier used a set of numbered ivory rods to simplify complex multiplication and division tasks?

A. Abacus

B. Pascaline

C. Slide Rule

D. Napier's Bones

Answer: Option D

Solution (By JKSSB Mock Tests)

John Napier invented 'Napier's Bones' in 1917, using carved rods to convert multiplication problems into simple addition steps.

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Question #1

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What is the hexadecimal equivalent of binary 1111?

A. 11

B. 10

C. F

D. E

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Correct Answer: Option C

Explanation:
Binary 1111 equals 15 decimal, which is F in hexadecimal.

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Question #2

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What type of storage or memory media was predominantly used as the secondary backup storage mechanism in first-generation computers?

A. Optical Compact Discs

B. Solid State Drives

C. Floppy Disks

D. Magnetic Tapes and Magnetic Drums

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Correct Answer: Option D

Explanation:
First-generation computers relied on punched cards, paper tapes, and magnetic drums/tapes for external data retention.

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Question #3

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What is the primary storage device in a computer?

A. ROM

B. RAM

C. Hard disk

D. SSD

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Correct Answer: Option B

Explanation:
Primary storage refers to RAM, which holds data and instructions currently being processed.

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