 January 24th, 2023. How is the paper for shift 1? I have a memory based recreation of the paper with me. And it looks like most of the questions, a large proportion of the questions are just about directly substituting the formulas. So I had said this is a kind of easy exam going by the standard of the time when I wrote it. But I guess things are getting easy, so in the context of the exams these days it is modern too easy. There are three or four questions that actually require you to think that I am marked out here. One of these questions, a thermodynamic question is when one gram of liquid is converted into a vapor against a given external pressure, it is given that 10% of heat is used to expand the volume by a given amount and is asking the increase in internal energy. So this is a test of your understanding of the first law of thermodynamics while keeping in mind what is happening during a phase change. So you see a phase change is occurring here that is accompanied by an expansion and expansion means that work is done by the system. And the work done by the system is 10% of the total heat intake which means 90% of the heat intake goes into increasing the internal energy. This is the way to do this question. This is one of the few questions that asks you to think. The other being the inclined wave question where there are two masses on two inclined sides of a single wedge. One side is implanted 30 and the other side is 6. And these two masses are going to be accelerating around the respective inclines and the question is the tension in the string is how much. So of course this is straightforward where you just have to draw the force diagram for the two masses with taking equal tension in the strings because the string is masses. And there is a gmg sign taken on both sides. So this is at least a question where you actually have to draw the free body diagram. And from that you have one question where a silly mistake is possible. The weight of an object is 8 Newtons, find out its weight at a height of 3200 millimeters from the Earth's surface. Now you are not supposed to use the acceleration g change from our g into 1 minus 2 h by r. You are not supposed to use that because that is only meant for cases where h is much smaller than r. Here h is 3200 kilometers and r is 6400 kilometers which is not much smaller than r. So you have to directly substitute it into the formula for gravitational expression that is gmg by r square. There are one or two questions from areas that are absolutely scoring areas but that are generally ignored by students. One of these is from communication systems chapter. The signal of square shape is superimposed with a carrier wave of a given amplitude. And the modulation index is directly formula based. Modulation index is the ratio of modulation wave to the carrier wave and you get 1 by 2. If you have studied this chapter, which many people tend to ignore. Apart from this, we have a radioactive decay question. This is very straightforward if you remember what happens in an alpha decay, beta decay and gamma decay. There is also a question from dimensional analysis. So always these questions keep appearing. This reality is a topic you are not supposed to ignore. Damage analysis is simply to calculate the units of a quantity. And you can use common formulas like e is equal to h nu, p is equal to n v. Common formulas to try to figure out the units of a particular quantity. And convert those units. Look at the quantities representing the units mass, length and time. That gives you the dimensions of the quantity. So this is a straightforward area. We can possibly observe it. Apart from this, all the remaining questions are straightforward formula substitutions. We have radius of variation of the solid sphere about an axis. That is parallel to its diameter like an outside sphere. This is also ICF plus MR square plus internal axis here. We have springs in series. There is a direct formula for that. You have the force of repulsion between two infinite correct carrying values. You have standard series parallel combinations of resistors and what so ever. The field due to a correct carrying loop at any point of its axis. So these are some of the formulas that are involved here. Direct substitution of values or expressions into these formulas. Apart from that, you have to go over the questions which actually need to be think. Finally, there are two questions from areas that are sort of ignored usually. That is my take on this video.