Four rods of silver,copper,brass,and wood are of the same shape. They are heated together after wrapping a paper on each. The paper will burn first on:

What is heat transfer? Give its types.

$Assertion:$ Two thin blankets put together are warmer than a single blanket of double the thickness.
$Reason:$ Thickness increases because of the air layer enclosed between the two blankets.

Write the definition of thermal conduction and explain thermal conduction in solid bodies.

The bottom of a lake is at $0^{\circ} C$ and the atmospheric temperature is $-20^{\circ} C$. If $1 \, cm$ of ice is formed on the surface in $24 \, h$,then the time taken to form the next $1 \, cm$ of ice is ......... $h$.

$A$ thin paper cup filled with water does not catch fire when placed over a flame. This is because