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  1. The frequencies of X-rays,γ-rays and ultraviolet rays are respectively p,q and r
  2. The angle of a prism is A. One of its refracting surfaces is silvered
  3. The rate of increase of thermo-e.m.f. with temperature at the neutral temperature
  4. The horizontal range and maximum height attained by a projectile are R and H,respectively
  5. An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp