विज्ञानं की ट्रिक्स | science gk trick in hindi for ssc cgl pcs upsc pol...

विज्ञानं की ट्रिक्स | science gk trick in hindi for ssc cgl pcs upsc police ibps



best trick to remember uses concave lens and convex lens + concave mirror and convex mirror - science gk in hindi for all competitive exams like ssc cgl 2017 , up si , uppsc , state pcs , ibps , po , banking

science general knowledge in hindi

vigyan samanya gyan

uppsc upsssc

lower pcs upper pcs

ssc cgl 2017 for 5 august 2017 first , second , third shift