EXAMपुर BHAUTIK VIGYAN FOR UPSSSC/PET/UPSI/OTHER STATE SI/SSC(CGL,CHSL,GD,MT),DELHI POLICE(CONSTABLE & HEAD CONSTABLE), CONSTABLE, JAIL WARDER AND FIRE MAN, RAILWAY(NTPC/GROUP-D)AND ALL COMPETITIVE EXAM(भौतिक विज्ञान)