Direction : What value should come in the place of question mark (?) in the following questions?

$$ 68\sqrt?-826=262 $$

Who among the following was the first chief Justice of India  and assumed office on 26th Jan. 1950 ?

Direction: Study the following information carefully and answer the questions given below:
Eight persons A, B, C, D, E, F, G and H are sitting around a rectangular table in such a way that four persons sit on each of the four corner of the table and other four persons sit on the middle of each side. The one who sits at the corner of table faces outside the center of table and the one who sits at the middle side of table faces towards the center of table. Persons sitting on opposite sides are exactly opposite to each other.
F sits at one of the middle side of the table. Two persons sit between F and E. Only one person sits between F and C. E does not sit near to C. Either A sits 2nd to the left of H or 2nd right of H. One person sits between A and C. B and G sit opposite to each other. D sits 2nd to the left of B. G doesn’t sit next to F.

Four of the following five are alike in a certain way and hence they form a group. Which one of the following does not belong to that group?

Which state launched Jeevan Shakti Yojana in which women in urban areas to get Rs. 11 for each mask made by them at home?

TATA Sons signed an MoU with which of the following organisations for licensing of KNOWHOW for FNCAS9 Editor Linked Uniform Detection Assay (FELUDA) for rapid diagnosis of COVID-19?

Who were the first to issue gold coins?