EASY

Earn 100

The slope of the fusion curve for water is

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Important Questions on Thermal Properties of Matter

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

A steam engine intakes $50 g$ of steam at $100 ° C$ per minute and cools it down to $20 ° C$ . If latent heat of vaporization of steam is $540 cal g^{- 1}$ , then the heat rejected by the steam engine per minute is _____ $\times 10^{3} cal$

(Given : specific heat capacity of water : $1 cal g^{- 1} {{}^{\circ}C}^{- 1}$ )

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

A thermally insulated vessel contains

150 g

of water at

0 ° C

. Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at

0 ° C

itself. The mass of evaporated water will be closest to: (Latent heat of vaporization of water

= 2.10 \times 10^{6} J k g^{- 1}

and Latent heat of Fusion of water

= 3.36 \times 10^{5} J k g^{- 1}

)

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

A solid metal weighing

150 g

melts at its melting point of

800 ° C

by providing heat at the rate of

100 W

. The time taken for it to completely melt at the same temperature is

4 \min

. What is the specific latent heat of fusion of the metal?

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

If pressure increased on a piece of wax, the melting point of wax

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

Latent heat of vaporisation of water is

22.6 \times 10^{5} J {kg}^{- 1}

. The amount of heat needed to convert

100 kg

of water into vapour at

100 ° C

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

A closed bottle containing water at

30^{o} C

is open on the surface of the moon. Then-

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

Heat required to melt $1 g$ of ice is $80 cal$ . A man melts $60 g$ of ice by chewing in one minute. His power is______

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

1 kg

of water, at

20 ° C

is heated in an electric kettle whose heating element has a mean (temperature averaged) resistance of

20 Ω .

The rms voltage in the mains is

200 V

. Ignoring heat loss from the kettle, time taken for water to evaporate fully is close to
[ Specific heat of water

= 4200 J {kg}^{- 1} ° C^{- 1}

Latent heat of water

= 2260 k J k g^{- 1}

]

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

A thermally insulated cubical box of side length $20 cm$ and wall thickness $2 cm$ containing $2 kg$ of ice is closed on all sides. The mass of ice melted in $10$ hours is (Thermal conductivity of the material of the box $= 0.01 {Wm}^{- 1} K^{- 1},$ latent heat of ice $= 360 \times 10^{3} J {kg}^{- 1}$ and ambient temperature $= 40 ° C$ )

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

10 H

inductor carries a current of

20 A

. If the energy stored in this inductor melts ice at

0 ° C,

then the mass of the ice melted is

[

Latent heat of ice

= 2.26 \times 10^{3} J {kg}^{- 1}]

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

If minimum possible work is done by a refrigerator in converting 100 grams of water at

0 ° C

to ice, how much heat (in calories) is released to the surroundings at temperature

27 ° C

(Latent heat of ice

= 80 Cal / gram

) to the nearest integer?

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Change of State

A piece of ice falls from a height

h

so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of