www.mgu.ac.in Mahatma Gandhi University Model Question Paper

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Model Question Paper
MAHATMA GANDHI UNIVERSITY
COMPLEMENTARY – CHEMISTRY AND GEOLOGY

Part A(Objective type- weight 1 each)
Bunch 1
1). Intensity of light is proportional to ---------------of wave
a). amplitude b). (amplitude)2 c). (amplitude)1/2 d). 1/amplitude
2). Two waves of amplitudes 3 units and 2 units interfere constructively. What is the net intensity of bright band
a). 9/4 b). 13 c). 5 d). 25
3). In the Young’s double slit experiment, wavelength of light is doubled and slit width is halved, the band width becomes--------- times
a). 2 b). 4 c). 8 d). 6

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Bunch 2
5). In a diffraction experiment using a straight edge, the diffraction pattern is obtained ------- the edge of geometric shadow
a). above b). below c). parallel to d). close to
7). Polarization is a confirmatory test of ----------------- character of light wave
a). oscilatory b). longitudinal c). transverse d). vibrational
10). Velocity of propagation of extraordinary ray in a calcite crystal will be -------------- in ------------ direction/directions
a). same, all b). different , different c). changing, same d). same only for particular colours, different
12). Population inversion in an active medium means
a). more atoms in the upper state b). more atoms in the ground state c). atoms are uniformly distributed d). atoms are unstable
13). In general, an atom can interact with radiation over a range of frequencies and the strength of interaction is known as
a). delta function b). line- shape function c). gamma function d). Beta function
14). In Ruby Laser the excitation of active medium is done by
a). optical pumping b). electric discharge c). Heating d). rubbing
15). The most effcient gas laser is
a). Hydrogen Laser b). Oxygen Laser c). Helium laser d). carbon dioxide Laser
16). When magnetic material is super cooled it becomes
a). paramagnetic b). diamagnetic c). ferromagnetic d). non- magnetic

Part B (Short answer questions- weight 1 each)
17). Explain coherent sources of light with an example. Explain the conditions to have constructive and destrucive interfernce.
18). With a neat diagram write a note on interfernce in thin films.
19). Briefly explain the resolving power of a microscope and a telescope.
20). What is polarization?. What is double refraction in crystals?.
21). Explain how the half-wave plate and quarter-wave plate work?
22). Explain spontaneous emission and stimulated emission in Lase.
23). With a neat diagram writea note on Nd-Yag laser.
24). What is superconductivity ?. What is Meissner effect?

Part D ( Essay type questions- weight 4 each)
31). Derive the expression for the bandwidth of interference pattern in double slit experiment. What are the differences between Interference and diffraction?. Distinguish between Fresnel class of diffraction and Fraunhofer class of diffraction.
32). With necessary theory, explain the Einstein’s coefficients in Laser theory. Explain the working of He-Ne Laser. Give two uses of Laser.
33). With a diagram explain diffraction at a straight edge. Using the theory of grating, explain how wavelength of light is determined in normal incidence mode.

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