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We report the first results obtained from our campaign to characterize theintranight-optical variability (INOV) properties of {\it Fermi}~detectedblazars, using the observations from the recently commissioned 1.3 m J CBhattacharya telescope (JCBT). During the first run, we were able to observe 17blazars in the Bessel $R$ filter for $\sim$137 hrs. Using $C$ and scaled$F$-statistics, we quantify the extent of INOV and derive the duty cycle (DC)which is the fraction of time during which a source exhibits a substantial fluxvariability. We find a high DC of 40\% for BL Lac objects and the flat spectrumradio quasars are relatively less variable (DC $\sim15$\%). However, whenestimated for blazars sub-classes, a high DC of $\sim$59\% is found in lowsynchrotron peaked (LSP) blazars, whereas, intermediate and high synchrotronpeaked objects have a low DC of $\sim$11\% and 13\%, respectively. We findevidences about the association of the high amplitude INOV with the$\gamma$-ray flaring state. We also notice a high polarization during theelevated INOV states (for the sources that have polarimetric data available),thus supporting the jet based origin of the observed variability. We plan toenlarge the sample and utilize the time availability from the small telescopes,such as 1.3 m JCBT, to strengthen/verify the results obtained in this work andthose existed in the literature.

Intra-Night Optical Variability Monitoring of Fermi Blazars: First Results from 1.3 m J C Bhattacharya Telescope