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  1. Three solids of masses m₁,m₂ and m₃ are connected with weightless string
  2. An object is 8 cm high. It is desired to form a real image 4 cm high at 60 cm from
  3. An ideal gas is compressed to half its initial volume by means of several processes.
  4. A mixture consists of two radioactive materials A₁ and A₂ with half lives of 20s
  5. In communication with help of antenna if height is doubled then the range