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  1. The area of cross-section of one limb of an U-tube is twice that of the other.
  2. The process of adding impurities to the pure semiconductor is called
  3. Two sources P and Q produce notes of frequency 660 Hz each.
  4. A charged oil drop is suspended in a uniform field at 3×10⁴ V/m so that it neither falls
  5. A wire of length L metre carrying a current I ampere is bent in the form