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Class 9 Physics Thermal Properties of Matter 9. Differentiate between evaporation and boiling.


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9. Differentiate between evaporation and boiling.

iii. Mercury is used as thermometric material because it has(a) uniform thermal expansion(b) low freezing point(c) small heat capacity(d) all the above properties
iii. Mercury is used as thermometric material because it has(a) uniform thermal expansion(b) low freezing point(c) small heat capacity(d) all the above properties

iii. Mercury is used as thermometric material because it has(a) uniform thermal expansion(b) low freezing point(c) small heat capacity(d) all the above properties

8.10 Define latent heat of vaporization.
 8.10  Define latent heat of vaporization.

8.10 Define latent heat of vaporization.

b) Why small gaps are left at the joints of sections of railway tracks? Explain the phenomenon involved in it.
b) Why small gaps are left at the joints of sections of railway tracks? Explain the phenomenon involved in it.

b) Why small gaps are left at the joints of sections of railway tracks? Explain the phenomenon involved in it.

8.7 Explain the volumetric thermal expansion.
 8.7 Explain the volumetric thermal expansion.

8.7 Explain the volumetric thermal expansion.

8.1 Encircle the correct answer from the given choices.i. Water freezes at(a) 0^{\circ} \mathrm{F} (b) 32^{\circ} \mathrm{F} (c) -273 \mathrm{~K} (d) 0 \mathrm{~K}
8.1 Encircle the correct answer from the given choices.i. Water freezes at(a)  0^{\circ} \mathrm{F} (b)  32^{\circ} \mathrm{F} (c)  -273 \mathrm{~K} (d)  0 \mathrm{~K}

8.1 Encircle the correct answer from the given choices.i. Water freezes at(a) 0^{\circ} \mathrm{F} (b) 32^{\circ} \mathrm{F} (c) -273 \mathrm{~K} (d) 0 \mathrm{~K}

5. A fixed temperature at which a pure liquid boils is calleda) melting pointb) freezing pointc) boiling pointd) Both (a) and (b).
5. A fixed temperature at which a pure liquid boils is calleda) melting pointb) freezing pointc) boiling pointd) Both (a) and (b).

5. A fixed temperature at which a pure liquid boils is calleda) melting pointb) freezing pointc) boiling pointd) Both (a) and (b).

c) Convert 212^{\circ} \mathrm{F} into Celsius and Kelvin.
c) Convert  212^{\circ} \mathrm{F}  into Celsius and Kelvin.

c) Convert 212^{\circ} \mathrm{F} into Celsius and Kelvin.

8.8 Define specific heat. How would you find the specific heat of a solid?
 8.8 Define specific heat. How would you find the specific heat of a solid?

8.8 Define specific heat. How would you find the specific heat of a solid?

4. a) Explain the effects of large specific heat of water with examples from our daily life.
4. a) Explain the effects of large specific heat of water with examples from our daily life.

4. a) Explain the effects of large specific heat of water with examples from our daily life.

EXAMPLE 8.2Change 300 \mathrm{~K} on Kelvin scale into Celsius scale of temperature.
EXAMPLE 8.2Change  300 \mathrm{~K}  on Kelvin scale into Celsius scale of temperature.

EXAMPLE 8.2Change 300 \mathrm{~K} on Kelvin scale into Celsius scale of temperature.

b) 2 \mathrm{~kg} of copper requires 2050 \mathrm{~J} of heat to raise its temperature through 10^{\circ} \mathrm{C} . Calculate the heat capacity of the sample.
b)  2 \mathrm{~kg}  of copper requires  2050 \mathrm{~J}  of heat to raise its temperature through  10^{\circ} \mathrm{C} . Calculate the heat capacity of the sample.

b) 2 \mathrm{~kg} of copper requires 2050 \mathrm{~J} of heat to raise its temperature through 10^{\circ} \mathrm{C} . Calculate the heat capacity of the sample.

2. Heat capacity is the product of mass anda) Boiling pointb) Freezing pointc) Energyd) Specific heat of material
2. Heat capacity is the product of mass anda) Boiling pointb) Freezing pointc) Energyd) Specific heat of material

2. Heat capacity is the product of mass anda) Boiling pointb) Freezing pointc) Energyd) Specific heat of material

14. a) Draw the diagram showing real and apparent expansion of liquid. Label the diagram properly.
14. a) Draw the diagram showing real and apparent expansion of liquid. Label the diagram properly.

14. a) Draw the diagram showing real and apparent expansion of liquid. Label the diagram properly.

11. Write down the freezing and boiling points of followingi) Acetic acidii) Benzeneiii) Chloroformiv) Water
11. Write down the freezing and boiling points of followingi) Acetic acidii) Benzeneiii) Chloroformiv) Water

11. Write down the freezing and boiling points of followingi) Acetic acidii) Benzeneiii) Chloroformiv) Water

13. An iron block of volume 3 \mathrm{~m}^{3} is heated so that its temperature changes from 25^{\circ} \mathrm{C} to 100^{\circ} \mathrm{C} . If the coefficient of linear expansion of iron is 11 \times 10^{-6}{ }^{\circ} \mathrm{C}^{-1} . What will be the new volume of the iron block after heating ?
13. An iron block of volume  3 \mathrm{~m}^{3}  is heated so that its temperature changes from  25^{\circ} \mathrm{C}  to  100^{\circ} \mathrm{C} . If the coefficient of linear expansion of iron is  11 \times 10^{-6}{ }^{\circ} \mathrm{C}^{-1} . What will be the new volume of the iron block after heating ?

13. An iron block of volume 3 \mathrm{~m}^{3} is heated so that its temperature changes from 25^{\circ} \mathrm{C} to 100^{\circ} \mathrm{C} . If the coefficient of linear expansion of iron is 11 \times 10^{-6}{ }^{\circ} \mathrm{C}^{-1} . What will be the new volume of the iron block after heating ?

9. Evaporation can occur ata) freezing pointb) melting pointc) boiling pointd) all temperatures
9. Evaporation can occur ata) freezing pointb) melting pointc) boiling pointd) all temperatures

9. Evaporation can occur ata) freezing pointb) melting pointc) boiling pointd) all temperatures

10. Rate of evaporation of a liquid can be increased bya) increasing humidityb) decreasing temperaturec) increasing its boiling pointd) decreasing atmospheric pressure
10. Rate of evaporation of a liquid can be increased bya) increasing humidityb) decreasing temperaturec) increasing its boiling pointd) decreasing atmospheric pressure

10. Rate of evaporation of a liquid can be increased bya) increasing humidityb) decreasing temperaturec) increasing its boiling pointd) decreasing atmospheric pressure

8.5 How much heat is required to increase the temperature of 0.5 \mathrm{~kg} of water from 10^{\circ} \mathrm{C} to 65^{\circ} \mathrm{C} ? (115500 \mathrm{~J})
8.5 How much heat is required to increase the temperature of  0.5 \mathrm{~kg}  of water from  10^{\circ} \mathrm{C}  to  65^{\circ} \mathrm{C}  ? (115500 \mathrm{~J})

8.5 How much heat is required to increase the temperature of 0.5 \mathrm{~kg} of water from 10^{\circ} \mathrm{C} to 65^{\circ} \mathrm{C} ? (115500 \mathrm{~J})

11. Linear thermal expansion of a solid depends upona) increase in temperatureb) originallengthc) properties of materiald) all of these
11. Linear thermal expansion of a solid depends upona) increase in temperatureb) originallengthc) properties of materiald) all of these
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11. Linear thermal expansion of a solid depends upona) increase in temperatureb) originallengthc) properties of materiald) all of these

8.10 Find the temperature of water after passing 5 \mathrm{~g} of steam at 100^{\circ} \mathrm{C} through 500 \mathrm{~g} of water at 10^{\circ} \mathrm{C} . \left(16.2^{\circ} \mathrm{C}\right) (Note: Specific heat of water is 4200 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1} Latent heat of vaporization of water is \left.2.26 \times 10^{6} \mathrm{Jkg}^{-1}\right) .
 8.10  Find the temperature of water after passing  5 \mathrm{~g}  of steam at  100^{\circ} \mathrm{C}  through  500 \mathrm{~g}  of water at  10^{\circ} \mathrm{C} . \left(16.2^{\circ} \mathrm{C}\right) (Note: Specific heat of water is  4200 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1}  Latent heat of vaporization of water is  \left.2.26 \times 10^{6} \mathrm{Jkg}^{-1}\right) .
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8.10 Find the temperature of water after passing 5 \mathrm{~g} of steam at 100^{\circ} \mathrm{C} through 500 \mathrm{~g} of water at 10^{\circ} \mathrm{C} . \left(16.2^{\circ} \mathrm{C}\right) (Note: Specific heat of water is 4200 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1} Latent heat of vaporization of water is \left.2.26 \times 10^{6} \mathrm{Jkg}^{-1}\right) .

vi. What will be the value of p for a solid for which a has a value of 2 \times 10^{-5} \mathrm{~K}^{-1} ? (a) 2 \times 10^{5} \mathrm{~K}^{-1} (b) 6 \times 10^{-5} \mathrm{~K}^{-1} (c) 8 \times 10^{-15} \mathrm{~K}^{-1} (d) 8 \times 10^{-5} \mathrm{~K}^{-1}
vi. What will be the value of p for a solid for which a has a value of  2 \times 10^{-5} \mathrm{~K}^{-1} ? (a)  2 \times 10^{5} \mathrm{~K}^{-1} (b)  6 \times 10^{-5} \mathrm{~K}^{-1} (c)  8 \times 10^{-15} \mathrm{~K}^{-1} (d)   8 \times 10^{-5} \mathrm{~K}^{-1}
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vi. What will be the value of p for a solid for which a has a value of 2 \times 10^{-5} \mathrm{~K}^{-1} ? (a) 2 \times 10^{5} \mathrm{~K}^{-1} (b) 6 \times 10^{-5} \mathrm{~K}^{-1} (c) 8 \times 10^{-15} \mathrm{~K}^{-1} (d) 8 \times 10^{-5} \mathrm{~K}^{-1}

Worked Example 1The temperature of Hyderabad on a hot day is 45 degree Celsius \left(45^{\circ} \mathrm{C}\right) . What will be its equivalent temperature on Fahrenheit Scale?
Worked Example 1The temperature of Hyderabad on a hot day is 45 degree Celsius  \left(45^{\circ} \mathrm{C}\right) . What will be its equivalent temperature on Fahrenheit Scale?
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Worked Example 1The temperature of Hyderabad on a hot day is 45 degree Celsius \left(45^{\circ} \mathrm{C}\right) . What will be its equivalent temperature on Fahrenheit Scale?

EXAMPLE 8.1What will be the temperature on Kelvin scale of temperature when it is 20^{\circ} \mathrm{C} on Celsius scale?
EXAMPLE 8.1What will be the temperature on Kelvin scale of temperature when it is  20^{\circ} \mathrm{C}  on Celsius scale?
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EXAMPLE 8.1What will be the temperature on Kelvin scale of temperature when it is 20^{\circ} \mathrm{C} on Celsius scale?

c) How much heat is required to boil 3 \mathrm{~kg} water which is initially 10^{\circ} \mathrm{C} ?
c) How much heat is required to boil  3 \mathrm{~kg}  water which is initially  10^{\circ} \mathrm{C}  ?
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c) How much heat is required to boil 3 \mathrm{~kg} water which is initially 10^{\circ} \mathrm{C} ?

EXAMPLE 8.5 A container has 2.5 litres of water at 20^{\circ} \mathrm{C} . How much heat is required to boil the water?
EXAMPLE  8.5 A container has  2.5  litres of water at  20^{\circ} \mathrm{C} . How much heat is required to boil the water?
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EXAMPLE 8.5 A container has 2.5 litres of water at 20^{\circ} \mathrm{C} . How much heat is required to boil the water?

9. Differentiate between evaporation and boiling.
9. Differentiate between evaporation and boiling.
now playing
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9. Differentiate between evaporation and boiling.

EXAMPLE 8.6 A brass rod is 1 \mathrm{~m} long at 0^{\circ} \mathrm{C} . Find its length at 30^{\circ} \mathrm{C} . (Coefficient of linear expansion of brass =1.9 \times 10^{-5} \mathrm{~K}^{-1} )
EXAMPLE  8.6 A brass rod is  1 \mathrm{~m}  long at  0^{\circ} \mathrm{C} . Find its length at  30^{\circ} \mathrm{C} . (Coefficient of linear expansion of brass  =1.9 \times 10^{-5} \mathrm{~K}^{-1}  )
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EXAMPLE 8.6 A brass rod is 1 \mathrm{~m} long at 0^{\circ} \mathrm{C} . Find its length at 30^{\circ} \mathrm{C} . (Coefficient of linear expansion of brass =1.9 \times 10^{-5} \mathrm{~K}^{-1} )

EXAMPLE 8.7 Find the volume of a brass cube at 100^{\circ} \mathrm{C} whose side is 10 \mathrm{~cm} at 0^{\circ} \mathrm{C} . (coefficient of linear thermal expansion of brass =1.9 \times 10^{-5} \mathrm{~K} 1 ).
EXAMPLE  8.7 Find the volume of a brass cube at  100^{\circ} \mathrm{C}  whose side is  10 \mathrm{~cm}  at  0^{\circ} \mathrm{C} . (coefficient of linear thermal expansion of brass  =1.9 \times 10^{-5} \mathrm{~K} 1  ).
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EXAMPLE 8.7 Find the volume of a brass cube at 100^{\circ} \mathrm{C} whose side is 10 \mathrm{~cm} at 0^{\circ} \mathrm{C} . (coefficient of linear thermal expansion of brass =1.9 \times 10^{-5} \mathrm{~K} 1 ).

viii. Which of the following affects evaporation?(a) temperature(b) surface area of the liquid(c) wind(d) all of the above
viii. Which of the following affects evaporation?(a) temperature(b) surface area of the liquid(c) wind(d) all of the above
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viii. Which of the following affects evaporation?(a) temperature(b) surface area of the liquid(c) wind(d) all of the above

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