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  1. A black body is at 727⁰C. It emits energy at a rate which is proportional to
  2. Light of frequency 8×10¹⁵ Hz is incident on a substance of photoelectric work
  3. A radioactive element forms its own isotope after 3 consecutive disintegrations.
  4. The output of an AND gate is connected to both the inputs of a NOR gate,
  5. If two bodies are projected at 30⁰ and 60⁰ respectively with the same velocity, then