Let Us YOU Solve Physics JEE (MAIN) 2018 Physics Paper
In our website, www.PhysicsAcademyOnline.com, we teach Physics through a large number of video lectures, all organised systematically and accessed at the click of a mouse. Our target audience are students at advanced school level and introductory college level anywhere in the world. In Indian context, we give special attention to those students who will sit for + 2 Board and Competitive Examinations for engineering and medical courses in near future.
We @ www.PhysicsAcademyOnline.com discourage learning by rote. Our success mantra is: Theory First, Problems Next. That is, learn the theories well, visualise a problem clearly, connect it to the relevant theory(ies), complete the calculation without error. Explore shortcuts to save time and energy. In the last few blogs, we have demonstrated the benefit — or rather certainty — of this approach by discussing questions from JEE (Advanced) Papers of 2018. In this blog, I am going to pick up questions from another crucial exam: JEE (Main), which is taken by all engineering aspirants in India.
Considering the recent winds of change in the testing system, a few words will be appropriate here. JEE (Main) is the modern version of the earlier AIEEE. It has been conducted so far by Central Board of Secondary Education (CBSE), but from 2019 onwards it will be conducted by the newly formed National Testing Agency (NTA). Good news is, instead of being held once a year, it will be held twice a year — in January and April — for the academic session beginning in August of that year. Pen-and-paper based tests will be replaced by computer based tests, although the syllabus and pattern of questions will remain the same.
As before, the marks obtained in JEE (Main) will determine admissions to the National Institutes of Technology (NITs, 31 in number), Indian Institutes of Information Technology (IITs, 23 in number), and other Centrally Funded Technical Institutes (CFTIs) that together offer around 24,000 engineering seats. Further, high JEE (Main) scores will be a benchmark for IIT aspirants, who will then appear for JEE (Advanced). Thus, the importance of JEE (Main) in career-building cannot be overstated! I am as excited as my readers to attempt some questions from this exam paper, and check the effectiveness of our approach. Are you ready? Remember, it is YOU who solve the questions with minimum hint from us. The MP4 video solution at the end of every question is for checking purpose; do not consult it until you complete your own solution.
Spread in front of me is the JEE (Main) 2018, Paper-1. This examination, meant for B.E. /B. Tech courses, was held in off-line mode on Sunday, 08 April 2018, at 0930 -1230 hours. [By the way, Paper-2, meant for B. Arch. / B. Planning courses and held later on the same day, does not interest us as it contains no Physics questions]. Paper-1 contains 90 questions in total, with maximum marks 360, divided equally among Physics, Chemistry and Mathematics. Part-A is Physics, containing 30 multiple-choice questions (MCQs), with only one option correct. You score 4 marks for each correct answer, -1 mark for an incorrect answer, and zero marks for no attempt. So negative marking haunts you here as well: never make wild guesses! The duration of the exam is three hours, which means one hour ideally for Physics part, or two minutes for each MCQ.
Question 2: All the graphs below are intended to represent the same motion. One of them does it incorrectly. Pick it up.
Compared to the questions dealt earlier from JEE (Advanced) papers, you will find this question relatively easy. That is true, in general, for all questions of JEE (Main) papers. Out of the four options given, only one option is correct. Therefore, the moment you identify the correct option, don’t waste time in checking/rechecking the other options which have to be wrong. Having said that, sometimes two options are quite close, and a student in undue haste picks the wrong one ignoring the right one! Avoid such mishaps.
The difficulty level of a question depends on the number of theories or formulas you have to employ to get to the solution. For a simpler question, often one theory is enough. Can you identify the type of motion? Can you interpret various graphs each plotting one variable against another? Subscribe to www.PhysicsAcademyOnline.com, and watch the lecture exclusively on this: Chapter Name – Mechanics; Category – Basic; Topic Name – Motion in One and Two Dimensions; Video Name – Graphical Analysis of Rectilinear Motion.
Make your choice, and confirm from the accompanying video solution.