If the dimensions of a physical quantity are given by M^aL^bT^c, then the physical quantity will be

Which two of the following five physical parameters have the same dimensions ?
1.  Energy density
2.  Refractive index
3.  Dielectric constant
4.  Young's modulus
5.  Magnetic field

If the error in the measurement of radius of a sphere is 2%, then the error in the determination of volume of the sphere will be

Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current I, would be