$A$ point charge $+q$ is placed at the centre of a cube of side $L$. The electric flux emerging from the cube is

If $f: R \rightarrow R$ is defined by $f(x)=[2x]-2[x]$ for $x \in R$,where $[x]$ is the greatest integer function,then the range of $f$ is:

If $L = 2.331 \, cm$ and $B = 2.1 \, cm$,then $L + B = $ (in $, cm$)

Three rings,each having equal radius $R$,are placed mutually perpendicular to each other and each having its centre at the origin of the coordinate system. If current $I$ is flowing through each ring,then the magnitude of the magnetic field at the common centre is

In the closest packing of atoms,there are

Two dice are rolled simultaneously. The probability that the sum of the two numbers on the dice is a prime number is: