21000+ Important MCQs for UPSC

ISI mark is a certification mark for industrial products in India, which is mandatory for certain products to be sold in India, like most of the electrical appliances viz; switches, electric motors, wiring cables, heaters, kitchen appliances etc., and other products like portland cement, LPG valves, LPG cylinders, automotive tyres.

The correct match list is:

Aryabhatta — Invention of the digit zero.
Bhaskaracharya — Time taken by the earth to orbit the sun.
Budhayana — Calculation of the value of π (Pi)
Gyandeva — The game of snakes and ladders
Zero was invented in India by Indian mathematicians dating as early as the 5th century. They widely used it in calculations, astronomy, and astrology. Zero was spread by Arabians to Europe and thereon it was spread all over.

The famous Hindu mathematician, Bhaskaracharya, in his treatise Surya Siddhanta, calculated the time taken for the earth to orbit the sun to nine decimal places (365.258756484 days).

Bhaskaracharya rightly calculated the time taken by the earth to orbit the sun hundreds of years before the astronomer Smart. His calculations were – Time taken by earth to orbit the sun (5th century): 365.258756484 days.

The value of Pi was first calculated by Budhayana, and he explained the concept of what is known as the Pythagorean Theorem.

The game of snakes and ladders is most popular in almost all houses and across all countries of the world. The credit for the game should go to the 13th century Marathi saint-poet composer Gyanadev, Jnanadeva, also known as Jnanashwar. When the saint invented the game it was called Mokshapat.