Statement A convection involves flow of matter within a fluid due to unequal temperatures of its parts.
Statements B A hot bar placed under a running tap water loses heat due to effect of convection with in water.
Statement C Heat transfer always involves temperature different between two systems.
Identify the correct option.

(A) : Convection involves flow of matter with in a fluid due to unequal temperatures of its parts ( R) : A hot bar placed under a running tap loses heat by conduction between the surface of bar and water and not by convection with in water.

Sometimes it is said that "heat is developed" in a resistance when there is an electric eurrent in it .Recall that heat is defined as the energy being transferred due to the temperature difference, Is the statement under quotes technically correct?

Sometimes it is said that "heat is developed" in a resistance when there is an electric eurrent in it .Recall that heat is defined as the energy being transferred due to the temperature difference, Is the statement under quotes technically correct?

Sometimes it is said that "heat is developed" in a resistance when there is an electric eurrent in it .Recall that heat is defined as the energy being transferred due to the temperature difference, Is the statement under quotes technically correct?

(A) : Heat transfer always involves temperature difference between two systems (or) two parts of the same system ( R) : Any energy transfer that does not involve temperature difference in some way is not heat

In natural convection, the fluid motion is caused due to density difference produced by temperature gradient. Statement II: In forced convection, the fluid is forced to flow along the solid surface by means of fans or pumps.

In natural convection, the fluid motion is caused due to density difference produced by temperature gradient. Statement II: In forced convection, the fluid is forced to flow along the solid surface by means of fans or pumps.

In a common room heating system, Statement (A): Hot water is circulated through radiators by forced convection. Statement (B): The warmed air rises by natural convection.

In an experiment to determine the thermal conductivity of copper with Searle's apparatus, 100 gm of water flowed in 4.2 minutes past the cold end of the copper bar, its initial and final temperatures being 25°C and 52°C respectively. If the temperature difference between two points in the bar 10 cm apart is 23°C and the area of cross-section of the bar is 5 "cm"^2 , calculate the coefficient of thermal conductivity of copper. Specific heat capacity of water 4,200 "J kg"^(-1) "K"^(-1)