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Question

Hot coffee and an ice cream are left in an open room. 
Choose the correct observation after some time.
  1. Temperature of ice cream decreases
  2. Temperature of hot coffee decreases
  3. Temperature of outside air increases
  4. Temperature of room increases


Solution

The correct option is B Temperature of hot coffee decreases

Heat flows from hot objects to cold objects.
- Hot objects cool down as heat flows out of them into the surrounding air as it is cooler. So, the temperature of the hot coffee decreases as it gives out heat.
- Cold objects warm-up because heat from hot surroundings flow into them. Thus, the temperature of ice cream increases as it takes in heat.

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