[ Official ] How was the Prelims 2021 paper?
How was the paper guys ?
plmokn25688524,konkankohinoor
@Captainnerd yaar lekin fir toh har cheez straight line par travel karegi agr uspar force padegi toh , even a ball thrown from Earth .. I accept iska matlab yeh hoga ki ball has same speed too similar to light toh woh statement bhi galat hoga .. But read thisAlbert Einstein, in his theory of special relativity, determined that the laws of physics are the same for all non-accelerating observers, and he showed that the speed of light within a vacuum is the same no matter the speed at which an observer travelsthis is not applicable for other things…Rest assured , if It has answer other than D, I will quit my preparation for good..Tag me when the answer key comesAgar yeh bhi sahi nahin hua after doing so much courses on light , I will admit I lack basics and will quit the whole preparation
bro you are hundred percent correct.
bhai thoda to sharm karo kitni mehnat karwaoge.
""light travels in a straight line in Class VI; it does not do so in Class XII and beyond!""
this line is copied from and given in link of class 12 ncert physicsChapter-10.pmd (ncert.nic.in) see blue box page 3/35 bhai ever heard of wave optics ya science background se nahi ho ?
now look at option c "c) Light always travels in straight line. " yahipar wrong prove ho gaya na?
ek aur baat jo change nahi ho use CONSTANT kehte he. look at the list of constants in this ncert pdf in appendix 3 . speed of light is at top Appendices and Answers.PMD (ncert.nic.in)
if you are wrong accept it instead of fighting againt your own self. break open your cocoon of utopia. bhai matlab easy questions ko bina baat ke uljha rahe ho atleast research to kia karo. doosre log distract hote he.
Bro yahi to context poocha hai ki astronomical distance measurement mein light always straight line mein travel karta hai ye fact ko consider kiya jata hai taki jo normal gravity wo sab ka bending phenomena hai wo sab ko ignore kar sake aur simply fir distance calculate kiya ja sake. Aise sirf agar poochta light travels always in straight line to ye galat statement hoti main is baat se agree karta hun. But astronomical measurement ke liye hum ye assume karte hain ki ye straight line mein travel karte hain taki jo bhi associated issues honge bending wo sab ko ignore karke distance find out kar sake.
Many people are telling to consider the doubtful questions as wrong.. but how many double questions are there? I mark the following doubtful questions-
Copper smelting d
Pressure cooker d
State a
Indus - chenab
Rtc- 2&3
Mitochondria- a
Virus - d
Magnetite- d
EPFO 2&3
Art 32
British model c
Federalism a
Copper smelting D
pressure cooker 1 and 3 only
article 14 for uncontrolled legislation
Temperature for Sure hoga. ISOCHORIC PROCESS HAI NA KI ISOTHERM OR ADIABATIC.
Confirmed.
Bhai jab closed system honge especially like the case of pressure cooker to inside ke mechanism steam ke pressure se hi achieve hote hain to outside ke heat flow aur temperature ke scale se sirf delay aur rapid ka fark aayega
Nahi. Aisa impossible hai Energy kaise conserve kroge fir ? bina temp rise ke ?
Jo aap bol rhe ho woh Isotherm process hai ie temp constant rahe.
Yeh Baat ka proof hai aapke pass koi ? toh please share ? Pressure cooker ki thermo ISOCHORIC hoti hai ..
Jai Shree Ram !
wertyuiuygfdfghn,@Captainnerd Matlab Yaar kuch bhi to prove your answerNewton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a forceIf there is no force acting everything will travel straight !!!!Regarding light , it will bend around stars , blackholes etc .. So you can disprove that alsoAnswer will be D because most of space is vacuum where light has constant speedWe are not using light year to measure Earth’s atmosphere (it is too small for that)Even for a large dust cloud near a supernova, light year will be measured because in that also much of the space is empty !!!!
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@babu_bisleri omg, has this not been settled yet??temperature of the flame does not matter.If you want proof, check what the usual temperature of a flame is. It is usually upwards of 500 degrees. Temperature at which food is cooked is much lower than that. At 500 degrees, you will be eating charcoalAlso, thermodynamically, P=T, in a closed system. A closed system is one where there is no exchange of mass with surroundings. Till the whistle goes off, a cooker is a closed system. The whistle goes off when the cooker hits the maximum temperature possible, which will be much lower than the flame temperature
Lol
Closed system me heat transfer hota hai. Adiabatic system me nhi hota. Who is talking about mass here. Heat is definitely transferred. :)
due to external heat food gets heated and pressure of the system increased and hence the whistle.
P = T as temp inc P inc and hence the whistle which is for security purpose. Temp things is so naive and common.
It is very basic thermodynamics, not even class XI.
Are you from humanities background ?
Jai Shree Ram !
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