Birla institute of technology question papers

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46. Which of the following is optically
active?
(1) stretched polymer sheet
(2) silvered glass
(3) calcite
(4) quartz

47. In the He-Ne laser the role of the Heatom
is
(1) to emit the red light
(2) to control the output
(3) to control the wavelength
(4) to effect population inversion
between the Ne levels

48. The part of a transistor, which is heavily
doped to produce a large number of
majority carriers, is
(1) base (2) emitter
(3) collector (4) none of these

51. End of glass tube becomes round on
heating due to
(1) surface tension (2) viscosity
(3) gravity (4) friction

In a p-n-junction photo cell, the value of
the phtoelectromotive force produced
by monochromatic light is proportional
to
(1) the barrier voltage at the p-n
junction
(2) the intensity of the light falling on
the cell
(3) the frequency of light falling on the
cell
(4) the voltage applied at the p-n
Junction

60. For detecting light intensity, we use
(1) photodiode in reverse bias
(2) photodiode in forward bias
(3) LED in reverse bias
(4) LED in forward bias

61. If elements of principal quantum number
n > 4 were not allowed in nature, the
number of possible elements will be
(1) 4 (2) 32 (3) 60 (4) 64

62. Modulation is the process of changing
some characteristics of high frequency
carrier wave in accordance with the
audio frequency signal. The characteristic
most commonly changed is
(1) amplitude (2) velocity
(3) intensity (4) all of these

63. In Compton effect experiment, photons
of energy hn are incident on a target
material of atomic number Z. The change
in wavelength can be seen more easily
if

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