1. If mass M, area A' and velocity V are chosen as fundamental units, then the dimension of coefficient of viscosity will be: (a) M V/ A' (b) MA'/V (c) MV A' (d) M/VA' 2. A particle of mass m with an initial velocity ui + 2uj collides with a particle of mass 3m at rest. After collision, the two particles stick together and the combined particle moves with a velocity vi+v'. Which of the following is incorrect? (a) v=v'/2 (b) v=2v' (c) v=u/4 (d) v'=u/2 3. If the wavelength of a-line of Lyman series in hydrogen atom is 2, find the wavelength of B-line of Paschen series. 32x56 (a) -x2 23 36x53 352 (c) 32x53 -x2 26 (d) -x 26