Exams

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. 

Tractor was the single most important invention to farmers.

Enzymes are macromolecular biological catalysts. Enzymes accelerate chemical reactions. The molecules upon which enzymes may act are called substrates and the enzyme converts the substrates into different molecules known as products.

The ability of two or more substances to combine to form other substances is called Reactivity.

Given 

445 of 229.79 = ? of 2398.51

$$\begin{gathered} 245 x 230 = ? x 2400 \\ 24 x 46 = ? x 2400 \\ ? = 46/100 \\ ? = 2350 \end{gathered}$$

Human eye resolution is 576 Mega Pixels approximately.