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  1. A microscope is having objective of focal length 1 cm and eye-piece of focal length 6 cm.
  2. A particle executes simple harmonic oscillations with an amplitude
  3. The device can act as a complete electronic circuit is
  4. The energy required to charge a parallel plate condenser of plate separation d
  5. The mass of a lift is 2000kg. When the tension in the supporting cable is 28000N, then its acceleration is