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Heat is supplied to a ice at a constant ...

Heat is supplied to a ice at a constant rate Temperature variation with time is as shown in figure. Then –

A

During AB volume of substance increases

B

During BC volume of substance decreases

C

Specific heat of substance in liquid phase is proportional to reciprocal of slope of portion AB, of graph

D

Latent heat of fusion of substance is independent of portion AB of graph

Text Solution

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The correct Answer is:
B, D
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A metal ball of mass 1.0 kg is kept in a room at 15^(@)C . It is heated using a heater. The heater supplies heat to the ball at a constant rate of 24 W. The temperature of the ball rises as shown in the graph. Assume that the rate of heat loss from the surface of the ball to the surrounding is proportional to the temperature difference between the ball and the surrounding. Calculate the rate of heat loss from the ball when it was at temperature of 20^(@)C .

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Knowledge Check

  • A solid substance is at 30^(@)C . To this substance heat energy is supplied at a constant rate. Then temperature versus time graph is as shown in the figure. The substance is in liquid state for the portion (of the graph)

    A
    BC
    B
    CD
    C
    ED
    D
    EF

  • A solid material is supplied heat at a constant rate. The temperature of material is changing with heat input as shown in the figure. What does the slope of DE represent ?

    A
    Latent heat of liquid
    B
    Latent heat of vaporization
    C
    Heat capacity of vapour
    D
    Inverse of heat capacity of vapour

  • If specific heat capacity of a substance in solid and liquid is proportional to the temperature of substance, then temperature Vs time plot for the substance is best present by [Assume heat is supplied to substance at constant rate and initial temperature is less than melthing pint of substance.

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