What is the success rate for rechecking of the CBSE class 12 papers, and is there a chance of the marks decreasing?
Note : All this happened in academic year 2015–2016. CBSE Rules and Regulations regarding re-evaluation may have changed since then. So please read the instructions on CBSE website to know the exact procedure.The success depends upon the difference in marks which you was expecting and what you have got.If there is atleast a margin of 10 marks then only apply for re evaluation. Don't apply if there is difference of about 5 marks because in that case, chances of increase are very very low.Apply only when you are confident about at least 10 more marks because in that case there are good chances of increase.I have also applied for re evaluation in English. Let's see what happens.Edit : Got a 19 marks increase in my English paper. :)Two of my friends also got an increase of 9 and 16 marks.
What is the difference between split air conditioner, central air conditioning and window air conditioner?
Each and every answer was too long to be good. So posting a short answer.Every AC has 4 main component:Compressor (makes noise while working)CondenserExpansion valve (air losses the heat here / air becomes cool here)Evaporator (output of cold air)All the ACs that you mentioned are categorised by the placement of above four units in the AC.Window AC: the simplest and cheapest of allAll the four essential components are inside one box. Thus it is cheaper, but as the compressor is now closer to your room, you will hear a lot of noise. (It happens with some of our refrigerator’s compressor as well, we hear some noise while compressor is working)2. Split AC: little more complex-advanced and costly.Now to reduce noise, they decided to shift compressor somewhere away from the people who are in the room (Imagine 5 star hotel, where comfort is everything and the client wants to sleep in perfectly silent room - so the invention)With compressor they also shifted condenser outside, only evaporator is required near the room, but for some simplicity reason the expansion valve is also in the indoor unit.Note: Expansion valve makes hisssssss sound, so they are planning to shift it to outdoor unit as well. You might see the change soon.3. Central AC: Compressor condenser outside, far away from the room to be cooled.Imagine there's just one BIG outdoor unit (like in split AC but of much larger capacity) with multiple ducts (outlet openings) which are connected to multiple indoor units. These indoor units can be of different types. I'll post few pics of different indoor units which you see in offices and CCDs or multiplexes.Thank you. I might have skipped few details to keep it easy and short. Upvote if you liked the answer.
Two cards are drawn at a time from the deck of 52 cards. What is the probability that both of them are kings?
Assuming the cards are replaced after being pickedP = (4/52)*(4/52) = 1/169(Since there are 4 queens in a standard deck of cards)Assuming the cards are not replaced after being pickedP = (4/52)*(3/51) = 1/221