India will hold a mock drill on Tuesday to check preparedness of health facilities to deal with any spurt in COVID-19 cases, while cautious authorities encouraged the use of masks with Karnataka making it mandatory in schools, colleges and at places where large crowds gather for New Year celebrations. Union Health Minister Mansukh Mandaviya on Monday said all state health ministers will take part at their level in the mock drill to be conducted throughout the country at all COVID hospitals as part of precautionary measures following an increase in infections in China and other countries ''Such exercises would help...