Questions

Having won three silver medals, India won its first-ever gold in the history of Youth Olympics when weightlifter Jeremy Lalrinnunga claimed the top honours in the men's 62 kg category in Buenos Aires.

All are correct except 4. The Kuroshio is a north-flowing ocean  current on  the  west side  of  the  North Pacific  Ocean.  It is similar to the Gulf Stream in the North  Atlantic  and  is  part  of  the North  Pacific ocean  gyre.  Like  the Gulf  stream,  it  is  a  strong western boundary  current.  Gulf  stream  is not present in west Pacific coast

Semiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc. 2. Lattice structure and the atomic structure of constituent elements decide whether a particular material will be insulator, metal or semiconductor. Semiconductors are elemental (Si, Ge) as well as compound (GaAs, CdS, etc.). Silicon, Germanium, Gallium Arsenide are semiconductors, but Quartz is an insulator.