Where is the Forest Research Institute $(FRI)$ located?

$A$ square matrix $[a_{ij}]$ in which $a_{ij} = 0$ for $i \neq j$ and $a_{ij} = k$ (constant) for $i = j$ is called a

Identify the mixture that shows positive deviation from Raoult's law.

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

The number of unpaired electrons in $Zn^{2+}$ is

An aeroplane flying with uniform speed horizontally $1 \ km$ above the ground is observed at an elevation of $60^{\circ}$. After $10 \ s$,if the elevation is observed to be $30^{\circ}$,then the speed of the plane (in $km/h$) is