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  1. If critical angle for a material to air passage is 30°, the refractive index
  2. A wire is suspended vertically from one of its ends is stretched by attaching a weight
  3. If ₉₂U²³⁸ undergoes successively 8 ∝-decays and 6 β-decays, the resulting nucleus is
  4. Ohm’s law valid
  5. Two coherent monochromatic beams of intensities I and 4I respectively, are superposed.