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  1. An engine has an efficiency of 1/6. When the temperature of sink is reduced
  2. The period of oscillation of a mass M suspended from a spring of negligible mass is T
  3. A man of 50 kg mass is standing in a gravity free space at a height
  4. Two bodies A and B having temperature 327° C and 427° C are radiating heat
  5. Light is emitted when