  We conducted research on the classification and physical properties of 10
objects from the HASH (Hong Kong/Australian Astronomical Observatory/Strasbourg
Observatory H-alpha Planetary Nebula (PN)) database with small angular sizes (<
8\arcsec) in the northern hemisphere. The sample consisted of 6 Likely PNe, 2
new candidates, one emission-line star, and one object of unknown nature. Among
them, we observed 4 objects for the first time using the medium-resolution
TFOSC spectrograph located on the RTT150 cm of the T\"UB\.ITAK National
Observatory (TUG). To investigate the classification of the observed objects,
we utilized the emission line ratios of [O III]/H$_{\gamma}$, [O
III]/H$_{\beta}$, [N II]/H$_{\alpha}$ and [S II]/H$_{\alpha}$ and diagnostic
diagrams such as the Sabbadin-Minello-Bianchini (SMB) and
Baldwin-Phillips-Terlevich (BPT). When considering a broader range of
diagnostic criteria compared to those provided in the literature, our analyses
resulted in the reclassification of 4 objects from Likely PNe to True PNe and
the retention of the previous classification for the remaining 6 objects. In
addition, we obtained various physical conditions such as electron
temperatures, electron densities, logarithmic extinction coefficients, and
excitation classes for the 10 objects under study. Our analysis revealed that
the ionic abundances of the majority of these objects were in agreement with
Galactic PNe. Our spectral observations have led to the updating of 10 PNe in
the HASH database.
