All  are  correct.  Preamble  is  non-justiciable    in    nature    i.e.    its provisions  are  not  enforceable  in court of  law.  Preamble  is  neither  a source of power to legislature nor a prohibition   upon the   powers   of legislature.

The Justice  Party  was  a  political party in the Madras Presidency of British  India.  It  was founded    byT.    M.    Nairand P. Theagaraya     Chetty     in     1916. Communal division between Brahminsand non-Brahmins  began  in  the  presidency during   the   late-19th   and   early-20th century, mainly due to caste prejudices and disproportionate Brahminical representation in government jobs. The    Justice    Party's    foundation marked  the  culmination  of  several efforts to establish  an organisation to  represent  the  non-Brahmins  in Madras.  Founders  of  Justice  Party though  that  Congress  was  mainly Brahmin    party,    so    it    started opposing Congress

The  Poona  Pact  was  an  agreement between  Dr.  Babasaheb  Ambedkar and  Mahatma  Gandhi  which  was signed  on  24  September  1932  at Yerwada Central Jail in Pune, India, which asserted that there will be a single    Hindu    electorate,    with scheduled    castes    having    seats reserved     within     it,So     the representation of these classes was based  on  the  standards  of  joint electorates   and   reserved   seats. The  Communal  Award  was  made by    the    British    Prime    Minister Ramsay  MacDonald  on  16  August 1932    which    allowed    separate electorates  in  India,  and  it  was supported by Ambedkar.

Changes  made  in  FDI  policy  in June     2016     will     not     affect manufacturing  of  small  arms  and ammunition.

Amartya   Sen,   Indian   economist who  was  awarded  the  1998  Nobel Prize  in  Economic  Sciences  for  his contributions  to  welfare  economics and social choice theory and for his interest    in    the    problems    of society's poorest members

GST  is  a  destination-based  tax,  it means   end   users   consuming   any goods or services is liable to pay the Goods  and  Services  Tax.  The  tax  is collected  by  the  State  in  which  the goods or services are consumed and not  by  the  state  in  which  goods  are manufactured    and    If    there    are exports,  the  seller  of  the  goods  or services  is  exempted  from  paying the tax. GST is a consumption-based tax,  it  means  the  state  where  the goods  were  consumed  will  receive GST   and   where   goods   were   sold should  not  get  any  taxes.GST  is  a value added tax as it is based on the increase  in  value  of  a  product  or service  at  each  stage  of  production or   distribution.GST   is   not   gross value tax.

The  Wholesale  Price  Index  (WPI) was  main  index  for  measurement of  inflation  in  India  till  April  2014 when  RBI  adopted  new  Consumer Price   Index   (CPI)   as   the   key measure of inflation.