Question

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.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is B

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.