  We present the results of multi-wavelength observations of cores and hotspots
at L, C, X and U bands with the Very Large Array, of a matched sample of radio
galaxies and quasars selected from the Molonglo Reference Catalogue. We use
these observations to determine the spectra of cores and hotspots, and test the
unified scheme for radio galaxies and quasars. Radio cores have been detected
at all wavelengths in all the quasars in our sample, while only $\sim$ 50% of
the galaxies have detected cores in at least one wavelength. The degree of core
prominence in this sample is consistent with the unified scheme for radio
galaxies and quasars. A comparison of the distributions of the two-point
spectral index of the cores in our sample of lobe-dominated quasars (LDQs) with
a matched sample of core-dominated quasars (CDQs) shows that the distributions
for these two classes are significantly different, consistent with the
expectations of the unified scheme. The difference in the spectral indices of
the two hotspots on opposite sides are also significantly larger for quasars
than radio galaxies, as expected in the unified scheme. We also investigate the
relationship between the spectral index of the hotspots and redshift or
luminosity for our sample of sources.
