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  1. On observing light from three different stars P, Q and R, it was found that intensity
  2. The magnifying power of a telescope is 9. When it is adjusted for parallel rays
  3. A thin circular ring of mass M and radius R rotates about an axis through its centre
  4. The fossil bone has a ¹⁴C:¹²C ratio, which is [1/16] of that in a living animal
  5. Light with an energy flux of 25×10⁴ Wm⁻² falls on a perfectly reflecting surface