When a glass container containing water at room temperature is kept over a flame, the level of water first decreases slightly, then increases. Why?

Are core branches(Mechanical) in Top 3 NIT worth it ?

My rank in JEE Advanced 2022 is 1871. Should I go for IIT Guwahati ECE or IIT Kanpur Mechanical and try for a branch change to CS or Electrical Engineering? Is changing your branch very difficult?

Can i sacrifice board exams for jee mains as board exams are no where valueable as cuet and other will be seen for admission 

 

Is a student studying in IGCSE syllabus eligible for taking IOQP or IOQJS?

I have wasted my 11th? Is it still possible to get into my dream iit? Do i have to cover 11 th syllabus first? When and how can i finish it?