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Physics Question on Heat Transfer

Ice at temperature –10°C is converted to steam at 100°C, the curve plotted between temperature (T) and time (t) when it is being heated by constant power source is

A

Fig 1

B

Fig 2

C

Fig 3

D

Fig 4

Answer

Fig 2

Explanation

Solution

Solution: The heating process involves several stages:

Heating Ice from -10°C to 0°C: The temperature increases until it reaches 0°C.

Melting Ice at 0°C: The temperature remains constant while the ice melts into water, represented as a plateau on the graph.

Heating Water from 0°C to 100°C: The temperature of the water increases until it reaches 100°C.

Boiling Water at 100°C: The temperature remains constant as the water turns into steam, represented as another plateau on the graph.

Heating Steam from 100°C Onward: The temperature of the steam increases.

The correct graph will show:

  • An initial increase in temperature from -10°C to 0°C.
  • A plateau at 0°C during the melting phase.
  • An increase in temperature from 0°C to 100°C.
  • A plateau at 100°C during the boiling phase.
  • A continued increase in temperature as steam is heated.