WBUT 2012 PHYSICS-I [PH-201] Question Paper





Time Allotted : 3 Hours                                    Full Marks : 70

The figures in the margin indicate full marks.

Candidates are required to give their answers in their own words

as far as practicable.


(Multiple Choice Type Question)

1.       Choose the correct alternatives for any ten of the following:
                                                                                               10 x 1 = 10

          i)        The deBroglie wavelength of a moving electron subjected to             a potential V is

                   a)       1.26V                                  b)       12.26V

                   c)       122.6V                                d)       1226V

                   ( consider the appropriate units )

          ii)       For Laser action to occur, the medium used must have at                least

                   a)       2 energy levels                b)       4 energy levels

                   c)       3 energy levels                d)       one energy levels

          iii)      The Miller indices of a plane holding the intercepts
                   a2 , b , 3c  is

                   a)       (361)                              b)       (611)

                   c)       (631)                              d)       (321)