JAMMU UNIVERSITY BSC SEMESTER 6TH ONLINE EXAM MCQ PAPERS Physics
1. Basis is defined as
2. If ( 1 3 5) are the Miller indices of a plane, the intercepts made by the plane on the three crystallographic axes are :
3. A plane cuts intercepts a, 2b, c. The miller indices of this plane are :
4. Lattice + basis is
5. Which radiation are used in case of Laue method?
6. Every reciprocal lattice vector is
7. If the number of Bravais lattice is three, then the crystal is
8.Bragg’s law is modified due to
9. Vibrations of a crystal lattice are
10. In inelastic scattering of a photon with lattice a phonon is
11. The Einstein’s theory of lattice specific heat, solids vibrate with the
12 . Debye’s theory of lattice specific heat assumes that the vibration of the atomic oscillators is
13. According to BCS theory, the zero resistance of superconductors arises due to
14. A superconducting state is associated with
15. In Schottky defect the displaced positive ion settles at the
16. Equilibrium concentration of Frenkel defects in crystals is given by :
17. The susceptibility of diamagnetic material is about
18. All materials exhibit
19. If the susceptibility of a material is independent of temperature, then it is
20. The materials in which the permanent dipoles are aligned due to bonding forces are called
21. The paramagnetic susceptibility varies as
22. In a ferrimagnetic material, the opposite magnetic moments of two sets of atoms in
24. In a ferromagnetic material, as the applied field is gradually reduced to zero, the polarization still left is known as :
25. In single-mode step-index fibre
26. Refractive index of cladding of optical fibre is
27. Main energy losses in an optical fibre consist of
28. Population inversion in Ruby laser is achieved by applying :
29. Red light emitted by He-Ne laser is due to transition between
31. Which colour component of the pumping light is utilized in Ruby Laser?
32. He and Ne mixture in He-Ne Laser is in the ratio
33. In a BJT, as the conductivity of the base region increases, the punch-through voltage
34. Coupling from one stage to the next stage in R-C coupled amplifier is achieved via
35. Feedback ratio of an amplifier, which on application of a negative feedback, changes the voltage gain from -250 to -100 is
36. If Barkhausen criterion is not fulfilled by an oscillator circuit, it will
38. BJT has large switching times since it is a ------------------carrier device
39. Phase shift oscillator are used for
40. In a BJT, the largest current flow occurs
d) through the CB junction
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