What is the primary purpose of data entry in the context of mathematical analysis?

When a certain circuit consisting of a constant $emf$ $E$,an inductance $L$,and a resistance $R$ is closed,the current in it increases with time according to curve $1$. After one parameter ($E$,$L$,or $R$) is changed,the increase in current follows curve $2$,when the circuit is closed a second time. Which parameter was changed and in what direction?

Which one of the following is not a biopolymer?

$f(x) = (20 - x^4)^{1/4}$ for $0 < x < \sqrt{5}$,then $f(f(1/2))$ is equal to

$A$ die is thrown $10$ times. The probability that an odd number will come up at least one time is:

Which of the following is an azo dye?