2. The ratio of mobility of holes to mobility of electrons is :
3. What happens to the Fermi level if an intrinsic semiconductor is doped with acceptor atoms?
4. PIN diodes are used in which frequency range?
5. Which of the following is not true for a common collector amplifier?
6. The coefficient of the term (z - l)2 in the Taylors series of the function (z) = l/(z2- 9) about the point z = 1 is :
7. If the uncertainty in the velocity of a particle is equal to its velocity, what is the order of uncertainty in its location?
8. The energy of the particle in three dimensional cubic box of length L is given by2\xah2 2 mVthen the degeneracy of the state is :
9. If the operators A and B commute with H and [A, B] = C, where C is another operator, then :
10. If the quantum mechanical operators of two observables of a system do not commute, then :
11. How much energy is required to remove an electron from n = 8 state of hydrogen atom?
12. The ground state of a linear harmonic oscillator is :
13. The mass m of a moving particle is , where m9 is its rest mass. The linear momentum of the particle is:
14. Consider a 6 particle system with 5 particles arranged as a regular pentagon with the 6th particle at the centre. If all the 5 particles are connected to the central one by rigid rods, then the number of degrees of freedom for the system is :
15. The homogeneity of time leads to the law of conservation of:
16. If a particle move in a horizontal plane in a central force potential U® , which of the following physical quantities are conserved :
17. For what value of a and β do canonical transformation:the equations Q= qa cos βp, qa sin βp, represent a
18. If a particle hasrest mass and velocity , then the momentum of the particle is :
19. If all the surfaces are closed in a region containing volume V, then which of the following theorem is applicable?
20. A spherically symmetric charge distribution is given by p® p0if the value of r is between 0 and a and p(r) = 0, if r is greater than a. if 8mx^2 po = k, then total charge of the distribution is :
21. What happens to velocity of light as it travels from a denser medium to a rarer medium?
22. Gibbs paradox in statistical mechanics is related to the additive property of:
23. The rms speed of hydrogen gas molecules at STP is v m/s The gas is heated at constant volume till the pressure become 9 times its original value. What will be the new rms speed?
24. A canonical ensemble represents :
25. What is to a nuclear physicist as Hydrogen is to an Atomic physicist?
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