Hi raj as you are asking about the exam pattern of JEE-IIT so I am providing the information you required.
Joint Entrance Examination (JEE) is an all India common entrance examination. It is conducted for admission in various engineering courses

JEE Main Pattern

JEE-Main Exam has two papers, Paper-1 and Paper-2.
Both of the papers contain multiple choice questions.
Paper-1 is for admission in B.E./B.Tech (online and offline).
Paper-2 is for admission in B.Arch and B.Planning (offline only).

Mode of Examination:
The Paper-1 of JEE (Main) will be conducted in two separate modes.
Offline mode and Online mode.
A candidate will opt for EITHER Offline mode OR Online mode.
The Paper-2 of JEE (Main) will be conducted ONLY in Offline mode.



Dates of JEE (Main) for Pen and Paper Based examination or offline exam
04.04.2015
PAPER – 1
9:30-12:30hrs (IST)
PAPER – 2
14:0-17:0 hrs (IST)
Date of JEE (Main) online exam (Computer Based Examination)
PAPER 1 ONLY
10.04.2015 & 11.04.2015
Morning Shift: 09:30-12:30hrs (IST)
Afternoon Shift
14:0-17:0 hrs (IST)
Display of Answer key and Response sheets (OMR)
18.04.2015 to 22.04.2015
Declaration of JEE (Main) Score and top 150000 candidates eligible for appearing in JEE (Advanced) 27.04.2015
Display of Class 12/ equivalent Qualifying Examination Scores on the JEE (Main) website Second week of June