Polysaccharides have .............. linkage?

There are two wires of the same material and same length. If the diameter of the second wire is $2$ times the diameter of the first wire,then the ratio of the extension produced in the wires by applying the same load will be:

Which of the following is the correct order of basic strength?

Assuming the diodes to be of silicon with forward resistance zero,the current $I$ in the following circuit is.......$mA$

The $pH$ of $0.05 \ M$ acetic acid is $(K_a = 2 \times 10^{-5})$

Which one of the following oxides is expected to exhibit paramagnetic behaviour?