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

CS/B.TECH(New)/SEM-2/PH-201/2012

2012

PHYSICS-I

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.

GROUP – A

(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)