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  1. Which of the following pairs of quantities does not have same dimensional
  2. 180⁰ phase difference is obtained when light ray is reflected from
  3. Electromagnets are made of soft iron because soft iron has
  4. A car moving with a speed of 50 kmh⁻¹ can be stopped by brakes after at least 6 m
  5. Which series of hydrogen spectrum corresponds to ultraviolet region?