Question

Vijay performed an experiment to compare the heat conductivity of four different materials P, Q, R and S. Thumbtacks were fixed with wax on each material and then the materials were fixed to a trough containing hot water as shown in the diagram. Vijay tabulated his results as shown here.

Material	Time taken for thumbtacks to drop(minutes)
P	$5$
Q	$6$
R	$2$
S	$4$

What can be inferred from his experiment?

• A. Material R is a better conductor of heat than material S.
• B. Material S is a better conductor of heat than material R.
• C. Material Q is a better conductor of heat than material P.
• D. Materials P, Q, R and S are equally good conductors of heat.

Answer 1

The correct option is A Material R is a better conductor of heat than material S.

Material R is better conductor of heat because it took only $2$ minutes for the wax attached to it to melt as compared to material S which took $4$ minutes.