Is there geometrical isomerism in case of 2-methylcyclopentanone?
If you look at the structure of 2-methylcyclopentanone, you'll notice that it is asymmetric about the C-2 atom

This gives rise to two isomers; the R isomer on the left and the S isomer on the right

These are definitely optical isomers, more specifically enantiomers of each other. Whether these are 'geometric isomers' or not is a matter of how you define 'geometric' isomerism; the IUPAC Gold Book strongly discourages the usage of this term, instead preferring to use 'cis-trans isomerism'. If it is defined by the latter, then this compound does not display cis-trans isomerism, as there are no groups for the methyl substituent to be trans to.