List of practice Questions

In photoelectric emission process from a metal of work function $1.8\, eV$, the kinetic energy of most energetic electrons is $0.5\, eV$. The corresponding stopping potential is

What is the value of electron gain enthalpy of $Na^+$ if $IE_1$ of $Na = 5.1 \, eV$?

Peptide synthesis inside a cell takes place in

Mutations can be induced with

Of the following which one is classified as polyester polymer?

Organisms called methanogens are most abundant in a

Select the correct statement with respect to disease and immunization :

The correct floral formula of chilli is :

The freezing point depression constant for water is $-1.86^{\circ} Cm^{-1}$. If $5.00 \,g$ $Na_2SO_4$ is dissolved in $45.0\,g$ $H_2O$, the freezing point is changed by $- 3.82^{\circ} C$. Calculate the Van't Hoff factor for $Na_2SO_4$.

The function of leghaemoglobin in the root nodules of legumes is

The given figure is the $ECG$ of a normal human. Which one of its components is correctly interpreted below?

The half life of a radioactive isotope $X$ is $50$ years. It decays to another element $Y$ which is stable. The two elements $X$ and $Y$ were found to be in the ratio of $1 : 15$ in a sample of a given rock. The age of the rock was estimated to be