Question Text
Question 1 :
The snow on the mountain does not melt all at once when it is heated by the sun because it
Question 2 :
Assertion: Latent heat of fusion of ice is $336000$J $kg^{-1}$.
Reason: Latent heat refers to change of state without any change in temperature.
Question 3 :
Find the heat needed to convert 10 g of water into vapour (Latent heat of vapourisation of water = $2.24\quad \times \quad { 10 }^{ 6 }\quad J{ \quad kg }^{ -1 }$)
Question 5 :
__________ of ice is the energy which is used to change the state of ice to water.
Question 6 :
M g of ice at 0$^o$C is to be converted to water at 0$^o$C. If L is the latent heat of fusion of ice, the quantity of heat required for the above operation would be:
Question 8 :
Iron glows in red colour when it is heated to very high temperature. The reason for this is :<br/>
Question 9 :
The amount of heat required to change from solid to liquid state without rise in its temperature is called latent heat of fusion.
Question 10 :
When a substance changes from one state to another, it absorbs or loses a large amount of heat without any change in temperature. What does this type of energy known as?<br>
Question 11 :
$20g$ of ice and $20 g$ of hot water are mixed, when the ice is melted the temperature of the mixture was found to be $0^oC$. The temperature of hot water taken should be <div>($L_{ice}=$80 cal/g)<br/></div>