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  1. A astronomical telescope has objective and eye-piece of focal lengths
  2. Ist law of thermadynamics is based on
  3. Dimensions of resistance in an electrical circuit, in terms of dimension of mass M,
  4. The de-Broglie wavelength of an electron moving with a velocity 1.5×10⁸ ms⁻¹ is equal
  5. Two cities are 150 km apart. Electric power is sent from one city to another city