Questions

Metallic bond is a bond between two metal atoms. Here in the given option Hg is the only metal with metallic bond.

The macronutrient water is the most essential nutrient which plays a vital role in every function of the body. Macronutrients are those nutrients that are required in excess amounts for the development and functioning of the body.

No work done as there is no external external pressure in free expansion. 

Hence, Work done in a free expansion process is Zero.

The Constitution lists 27 expressed powers of Congress. It include power to declare war, levy taxes, regulate commerce and currency.

Congress's other expressed powers are wide-ranging, including:

The power to establish rules to allow foreign-born immigrants to become citizens of the United States

The power to make rules for bankruptcies

The power to punish counterfeiters

The power to set up a national post office

The power to provide for copyrights and patents to protect the work of inventors and artists

The power to organize all federal courts below the Supreme Court

The power to punish pirates

The power to hire pirates to attack foreign enemies

The power to make rules to regulate the conduct of the armed forces

The power to call out the militia to defend the country from invasions or insurrections

The power to organize and discipline the militiary

The power to govern the federal capital (Washington, DC)

The power to acquire lands from the states for use by the federal government

The power to make all Laws which shall be necessary and proper for carrying into Execution the foregoing powers.

Rajeev Suri

Resistivity :

Resistivity is a measure of the resistance to the flow of electrons. 

Conductivity :

Conductivity is just the inverse of resistivity, σ = 1/ρ, where σ is conductivity and ρ is resistivity.

Example:

Think of a pipe and water, the bigger the pipe, the easier water can flow and thus the lower the resistance.