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Subject :NCO    Class : Class 4

Select the INCORRECT match.
A Abacus – First calculating device. It was invented in the 16th century in China.
B Napier’s Bones – It was used for addition, subtraction, multiplication and division, made by Sir John Napier.
C Pascaline – First electro-mechanical calculator, invented by Blaise Pascal.
D Difference Engine – First mechanical computer, designed by Charles Babbage.

Ans 1:

Class : Class 5
Option - C

Ans 2:

Class : Class 5

Ans 3:

Class : Class 4

Ans 4:

Class : Class 4

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