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  1. If sink is at a temperature of -39⁰C and source at 0⁰C, then efficiency will be
  2. 180⁰ phase difference is obtained when light ray is reflected from
  3. The ionisation energy of an electron in the ground state of helium atom is 24.6 eV.
  4. A concave lens of focal length f forms an image which is 1/3 times the size
  5. A ship A is moving westwards with a speed of 10 km/h and a ship B 100 km