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What is GUI [ Graphical user interface ]

Every software widgets that the user can use to interact with your application known as GUI.

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What is the pulsating theory of the universe?

A A cosmological model that combines both the Big Bang and the Big Crunch as part of a cyclical event
B An expansion and contraction of the star as a whole in a regular periodic pulsation
C All the matter of the universe was present in a single place in the form of hot and dense fireball
D Counting of the galaxies is constant and new galaxies which are forming continuously are filling the empty spaces

Explanation: Sir J.C. Bose proposed a theory of the ascent of sap known as the pulsation theory. The Pulsating Universe Theory says that the universe follows self-sustaining cycles such as expanding and contrasting.

The hardest substance available on earth is

A Gold
B Iron
C Diamond
D Platinum

By whom and when did the idea of a constituent assembly was first proposed

A Dr. Sachinand Sinha, 1949
B Dr. Rajendra Prasad, 1949
C Dr. B.R Ambedkar, 1946
D M.N. Roy, 1934

Explanation: The idea of a constituent assembly was first proposed in 1934 by M.N. Roy. However, the actual constituent assembly was formed in 1946 on the basis of the cabinet mission plan.

Big bang theory was proposed by