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Answer 1

(4) 78 square is close to 6072 . 78square =6084 .6084-6072=12 is the number which should be added to 6072 to become a perfect square .(c) is the correct option .(5) 4 57/196= 4(196)+57/196 =784+57/196 =841/196 .The square root of 841/196= 29/14 as the square of 29 and 14 is 841 and 196 . So 29/14 is the answer and (d) is the correct option.
(6) √1.96= 1.4 is the answer . Hope it helps you...