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  1. In radioactive element, β-rays are emitted from
  2. A polished metal plate has a rough and black-spot. It is heated to 1400 K
  3. Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively
  4. Which of the following is true for number of spectral lines in going from Lyman series
  5. A wheel is rotating at 900 rpm about its axis.When the power is cut-off it