Cylindrical rods of various lengths and cross-sectional areas are made of different materials. Each rod is connected individually to the same battery, whose potential difference is known, and the current in the circuit is measured. Can the resistivities of the rods be compared

The answer is "Yes, because the lengths and cross-sectional areas of the rods can be measured".

Explanation:

From resistance: Thus we have V and I values, and if length (L) or cross-section zone could be specified (A) So, you can compare that resistivity, that's why the above-given answer is correct.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force