Chapter Questions
What is freezing mixture?
Define humidity, absolute humidity and relative humidity.
In diesel as well as in petrol engines, one complete cycle of operation involves ____, ____, ____ and ____strokes.
State two factors which affect the boiling point.
Density of water is maximum at ____${ }^{\circ} \mathrm{C}$.
In diesel engines, carburetor is replaced by____
The expansion of water on cooling below $4^{\circ} \mathrm{C}$ is called____
Calorimeter works on the principle of____
Define heat capacity and specific heat capacity.
What is fog or mist?
The specific latent heat of fusion of ice is____ $\mathrm{J} \mathrm{kg}^{-1} \mathrm{~K}^{-1}$ or____ $\mathrm{cal} \mathrm{g}^{-1}$.
State the principle of mixtures.
Define evaporation.
The latent heat of vaporisation of a unit mass of a liquid is called its____
Define the following:(i) melting or fusion(ii) freezing(iii) boiling(iv) condensation
What is an internal combustion engine?
How much heat is absorbed when $10 \mathrm{~g}$ of ice at $0^{\circ} \mathrm{C}$ is completely converted to water at $0^{\circ} \mathrm{C}$ ?
Define latent heat.
State the principle on which a refrigerator works.
$1 \mathrm{~g}$ of steam at $100^{\circ} \mathrm{C}$ cools to form water at $80^{\circ} \mathrm{C}$. The amount of heat liberated is ____(Total heat released $=\mathrm{Q}+\mathrm{H}$ )
Define latent heat of fusion and specific latent heat of fusion of ice.
The amount of heat required to raise the temperature of unit mass of a substance by one kelvin is called
What is a heat engine and name two types of heat engines?
Define latent heat of vapourization and specific latent heat of vapourization of water.
What is sublimation?
The direction of heat flow between two bodies is determined by____
State two factors which affect the melting point.
Define the efficiency of heat engine.
The temperature at which the given volume of air becomes saturated with water vapour without actually increasing the vapour content in it is called____
Define regelation.
Give a few examples and some practical applications of high specific heat of vapourization of water.
A body of mass $1 \mathrm{~kg}$ absorbs $4 \mathrm{~kJ}$ of heat when its temperature rises from $30^{\circ} \mathrm{C}$ to $40^{\circ} \mathrm{C}$. Calculate its specific heat capacity.
Explain sublimation.
State a few disadvantages of steam engine.
Give some natural consequences and a few practical applications of high specific heat capacity of water.
$1 \mathrm{~kg}$ of ice at $0^{\circ} \mathrm{C}$ is converted into steam at $100^{\circ} \mathrm{C}$. Calculate the heat requiredSpecific heat of fusion of ice $=336 \times 10^5 \mathrm{~J} \mathrm{~kg}^{-1}$Specific heat of vaporization of water $=2260 \times 10^3 \mathrm{~J} \mathrm{~kg}^{-1}$Specific heat capacity of water $=4200 \mathrm{~J} \mathrm{~kg}^{-1} \mathrm{C}^{-1}$
Differentiate between evaporation and boiling.
Explain the working of a refrigerator.
Describe a calorimeter.
An electric heater of power $500 \mathrm{~W}$ is used to raise the temperature of $2 \mathrm{~kg}$ of a liquid from $30^{\circ} \mathrm{C}$ to $40^{\circ} \mathrm{C}$ in 2 minutes. Find the heat capacity if the specific heat capacity of the liquid is $3 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{C}^{-1}$
Explain the formation of dew.
$10000 \mathrm{~J}$ heat is required to raise the temperature of a metal ball by $20 \mathrm{~K}$. Calculate its heat capacity.
Mention few natural consequences, and some practical applications of high specific latent heat of fusion of ice.
State a few advantages of an internal combustion engine.
Mention a few consequences of anomalous behaviour of water.
Describe an experiment to determine specific latent heat of fusion of ice by method of mixtures.
Explain the experiment to find the boiling point of water. Also explain its heating and cooling curves.
Describe an experiment to determine the specific heat capacity of a given solid by method of mixtures.
Describe the method to determine specific latent heat of vaporization of water using a calorimeter.
Describe an experiment to measure the melting point of naphthalene. Draw heating and cooling curves and explain them.