What is the concentration of nitrate ions $(NO_3^-)$ if equal volumes of $0.1 \ M \ AgNO_3$ and $0.1 \ M \ NaCl$ are mixed together (in $M$)?

Which are the most primitive types of organisms?

In an astronomical telescope in normal adjustment,a straight black line of length $L$ is drawn on the inside part of the objective lens. The eyepiece forms a real image of this line. The length of this image is $I$. The magnification of the telescope is:

In a metre bridge experiment,the ratio of the left gap resistance to the right gap resistance is $2:3$. The balance point from the left is: (in $~cm$)

$A$ $500 \,\mu F$ capacitor is charged at a steady rate of $100\, \mu C/s$. The potential difference across the capacitor will be $10\, V$ after an interval of.....$s$.

Which pair of oxides is acidic in nature?