When heat is given to an ice cube, its temperature

  1. firstly increases and then becomes constant
  2. firstly decreases and then becomes constant
  3. firstly remains constant and thereafter increases
  4. firstly remains constant and thereafter decreases

Answer (Detailed Solution Below)

Option 3 : firstly remains constant and thereafter increases
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NDA 01/2025: English Subject Test
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Detailed Solution

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CONCEPT:

  • Melting and Melting Point: The process of change of state from solid to liquid is called melting.
    • The temperature at which a solid starts to liquefy is known as the melting point of that solid.
    • The melting point of a substance at atmospheric pressure is called a normal melting point.
    • The normal melting point of ice is 0 °C.

EXPLANATION:

  • When heat is given to any substance, its temperature increases and it expands. Its expansion depends on the increase in its temperature.
  • During the melting of an ice cube, all the heat given to the ice cube spends in the change of state from solid to liquid. That's why the temperature of the material does not change. 
  • But further, if it is heated, then the temperature of the liquid will start increasing because it will start converting into vapour. Hence, option 3 is correct.

Additional Information

Characteristics of the states of matter:

Physical
state of
matter
Solid Liquid Gaseous
Fluidity/
Rigidity/
Plasticity/
Elasticity
Rigid/plastic/
elastic
Fluid Fluid
Volume Definite Definite Indefinite
Shapes Definite Indefinite Indefinite
Compressibility Negligible Very small Very high
Intermolecular
force
Strong  Moderate Very weak
Distance
between
particles
Minimum Moderate Very large
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