**Category : **3rd Class

Napier's bone is an abacus created by John Napier in 17 AD for calculation of products and quotients of numbers. Sir John Napier was a great mathematician of Scotland. This was a manual device. Napier's bone is also called Napier's rod. It was made up of bones and rods. It was capable of doing all the four mathematical operations - addition, subtraction, {multiplication and division. Using the multiplication tables embedded in the rods, multiplication can be reduced to addition operations and division to subtractions.

**Napier's bones was created by John Napier. From which country he belonged? **

(A) England

(B) Sweden

(C) France

(D) Scotland

(E) Netherlands

**Answer: (D)**

Explanation

Correct Option:

(D) John Napier belonged to Scotland.

Incorrect Options:

(A) England : John Napier did not belong to England. Therefore, option (A) is incorrect.

(B) Sweden: He did not belong to Sweden. Therefore, option (B) is Incorrect.

(C) France : He did not belong to France. Therefore, option (C) is Incorrect.

(E) Netherlands: He did not belong to Netherlands. Therefore, option (E) is Incorrect.

**Napier's bones was used for calculation. It was made up of bones and rods and was capable of doing all the four mathematical operations. What kind of device it was? **

(A) Automatic

(B) Electronic

(C) Manual

(D) Electric

(E) None of these

**Answer: (C) **

Correct Option:

(C) It was a manual device.

Incorrect Options:

(A) Automatic : Napier's bones was a device of 16th century and it worked manually. That's why option (A) is Incorrect.

(B) Electronic : Napier's bones was made up of bones and rods and no electronic things were used. That's why option (B) is Incorrect.

(D) Electric : Napier's bones was a manual device. That's why option (D) is Incorrect.

(E) Option (E) is Incorrect.

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