There are 2 questions which seem quite simple at first glance but i'm unable to solve them..the first one is question No:5(a) paper-I ce 2013 exam and the second 5b..

Question 5a asks for calculating volume while double integral is given.... so how double integral can give volume?? what is also perplexing is that we have 2 coordinate(x and y): axis so how volume can be computed in 2d??


Question 5b: in this question the examiner asks for line integral over the closed surface, in my opinion we have to parameterize this...but im having no idea how to do this....

kindly help me in this regard....