1.  An error 2% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is: 

Answer: Option D Explanation: 100 cm is read as 102 cm. A_{1} = (100 x 100) cm^{2} and A_{2} (102 x 102) cm^{2}. (A_{2}  A_{1}) = [(102)^{2}  (100)^{2}] = (102 + 100) x (102  100) = 404 cm^{2}.
