**Short Questions**

Define and explain the latent heat of fusion. |

Define coefficient of linear thermal expansion. Write its formula and unit. |

Define heat capacity. Write its formula and unit. |

Define heat. Write its unit. |

Define latent heat of vaporization. |

Define linear thermal expansion. On which factors does it depend? |

Define temperature and write its unit. |

Define the fusion point and freezing point? |

Define the latent heat of vaporization. |

Define the terms heat and temperature. |

Define the terms of thermal conduct and thermal equilibrium. |

Define thermal expansion. |

Define Volume thermal expansion. On which factors does it depend? |

Derive the relation for volume thermal expansion in solids. |

Describe the feature of mercury-in-glass thermometer |

Differentiate between temperature and heat? |

Differentiate between the real and apparent expansion of liquid? |

Every thermometer makes use of some property of a material that varies with temperature. Name the property used in: |

Explain that the bimetallic strip used in the thermostat is based on the different rate of expansion of different metals on heating. |

Explain the thermal expansion of liquids |

Explain the volumetric thermal expansion. |

Give coefficient of linear thermal expansion of some common solids. |

Give the values of β for different substances? |

Give two uses of cooling effect by evaporation. |

Highlight the different scale of temperature from one scale to another (Fahrenheit, Celsius and Kelvin scales) |

How can you convert the temperature from one scale to another (Fahrenheit, Celsius and Kelvin Scales?) |

How does heating affect the motion of molecules of a gas? |

How evaporation differs from vaporization? |

How specific heat differs from heat capacity? |

List the application of thermal expansion? |

Show that V = (1+ β Δ T)? |

What do you mean by lower and upper fixed points in a thermometer? |

What is a thermometer? Why mercury is preferred as a thermometric substance? |

What is meant by the internal energy of a body? |

Why does heat flow from hot body to cold body? |

Why gaps are left in railway tracks? |

Why gaps are left in the bridge with rollers? |

Why overhead transmission lines (wires on electric poles) are also given a certain amount of sag? |

Why the coefficient of volume expansion of liquids is greater than solids? |

**Long Questions**

A balloon contains 1.2 air at 15°C. Find its volume at 40°C. Thermal coefficient of volume expansion of air is 3.67 . |

An electric heater supplies heat at the rate of 1000J per second. How much time is required to raise the temperature of 200 g of water from 20°C to 90°C? |

Calculate the increase in the length of an aluminium bar 2 m long when heated from 0°C to 20°C, if the thermal coefficient of linear expansion of aluminium is 2.5. |

Define and explain the latent heat of fusion. |

Define evaporation. On what factor speed of evaporation depend? Explain. |

Define heat capacity. Derive its mathematical formula and write down an activity to |

Define latent heat of fusion and write down its mathematical formula. |

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

Define the latent heat of vaporization of water with the help of the experiment. |

Derive the relation for linear thermal expansion in solids. |

Describe an activity to determine the change of state of ice into water and steam by sketching graph. |

Explain the importance of large specific heat capacity of water. |

Explain the volumetric thermal expansion. |

Find the latent heat of fusion of ice with the help of the experiment. |

Find the temperature of the water after passing 5 g of steam at 100°C through 500 g of water at 10°C. (Note: Specific heat of water is 4200 Jkg⁻¹ K⁻¹, Latent heat of vaporization of water is 2.26×10⁶ ) |

How much heat is required to change 100g of water at 100°C into steam? (Latent heat of vaporization of water is 2.26 . |

How much heat is required to increase the temperature of 0.5 kg of water from 10°C to 65°C? |

How much ice will melt by 5000 J of heat? Latent heat of fusion of ice = 336000 J . |

Normal human body temperature is 98.6°F, convert it into Celsius scale and kelvin scale. |

Show that Lo = (1+ α Δ T)? |

Temperature of water in a beaker is 50°C, what is its value in Fahrenheit scale? |

What is linear Expansion? On what factor it depend? Derive its mathematical |

What is meant by evaporation? On what factors the evaporation of liquid depends? Explain how cooling is produced by evaporation. |

What is specific heat? Explain with examples and derive its mathematical formula. |

What is thermal expansion? Explain on the basis of kinetic molecular theory. |

What is thermometer? Explain its different types. |

What is volume expansion? On what factors it depend? Derive its mathematical |

Write down the applications of thermal expansion. |

Write down the consequences of thermal expansion. |

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