Solid State Physics-II - Quanta: BS/MSc Physics Books

1: Which method can be used to distinguish between the two types of carriers

a. Hall effect

b. Rayleigh method

c. Doppler effect

d. Fermi effect

2: Current is flowing in two long parallel conductors in the same direction. The conductors · · · each other

a. Are inclined to

b. Repel

c. Attract

d. Neither attract nor repel

3: Cathode rays enter in a uniform magnetic field perpendicular to direction of field. In magnetic field their path will be

a. Circle

b. Parabolic

c. Straight line

d. Elliptical

4: The force experienced by a charged particle in magnetic field is maximum when particle move in a direction

a. Perpendicular to

b. Parallel to

c. Is at rest

d. None of these

5: A particle moving in a magnetic field has an increase in its velocity then its radius of circle

a. Becomes half

b. Increases

c. Decreases

d. Remains same

6: If relative permeability of a substance is 0.79, then it is · · · material

a. Diamagnetic

b. Paramagnetic

c. Ferromagnetic

d. None of these

7: An electron enters a magnetic field acting vertically downward with a velocity v from east. The electron is deflected along

a. South

b. North

c. Southeast

d. Northeast

8: A charged particle moves through a magnetic field in a direction perpendicular to it. Then · · · remains unchanged

a. Direction

b. Speed

c. Velocity

d. Acceleration

9: Magnetic dipole moment is defined as

a. $\mu =\frac{I}{A}$

b. $\mu =\frac{A}{I}$

c. µ = IA

d. None of these

10: Which define the relation between magnetic torque and magnetic dipole moment

a. $\vec{\tau}\ =\vec{\mu}\ \times\ \vec{B}$

b. $\vec{\tau}=\vec{\mu} . B$

c. $\vec{\tau}\ =\ -\vec{\mu}\ .\vec{B}$

d. None of these

11: Resistivity (Ohm – m) of semiconductor varies

a. $\mathbf{{10}^{-5}\ -\ {10}^4}$

b. ${10}^{-6}\ -\ {10}^3$

c. ${10}^{-4}\ -\ {10}^5$

d. ${10}^5\ -\ {10}^{-5}$

12: Semiconductor compound is

a. Germanium

b. Sodium Chloride

c. Gallium Arsenide

d. Sodium Phosphate

13: Orbital of valance conducting band overlap in

a. Metals

b. Semiconductors

c. Conductors

d. Semi-metals

14: At 0K the valance band in intrinsic semiconductor is

a. Completely filled

b. Complete empty

c. Partially filled

d. Almost filled

15: In intrinsic semiconductor rate of generation of carrier’s ‘g” depends on

a. Volume

b. Temperature

c. Pressure

d. Entropy

16: Popping ratio is

a. ${10}^4\ -\ {10}^8$

b. $\mathbf{{10}^6\ -\ {10}^8}$

c. ${10}^7\ -\ {10}^9$

d. ${10}^3\ -\ {10}^6$

17: N-type semiconductors are made by adding

a. Group III

b. Group VI

c. Period III

d. Period VI

18: Both n and p type doping are charged

a. Neutral

b. Positive

c. Negative

d. Region dependent

19: With increasing depth in valance band the hole probability. . ..

a. Increases exponentially

b. Decreases exponentially

c. Increases linearly

d. Decreases linearly

20: Current density and drift velocity depends on

a. External electric field

b. External magnetic field

c. Both

d. Independent

21: The strongest diamagnetic material is

a. Bismuth

b. Hydrogen

c. Helium

d. Neon

22: The temperature at which ferromagnetic material changes into paramagnetic material is known as

a. Critical temp

b. Temp. inversion

c. Debye temp

d. Curie’s temp.

23: Which of the following magnetic substance can have positive permeability and negative susceptibility

a. Ferromagnetic

b. Paramagnetic

c. Diamagnetic

d. None

24: The susceptibility of diamagnetic material is

a. Very large

b. Small but positive

c. Small but negative

d. Zero

25: Paramagnetic susceptibility varies as

a. T

b. $T^2$

c. $T^{-2}$

d. $\mathbf{T^{-1}}$

26: Curie-Weiss law is

a. $\chi_m\ =\frac{C}{T}$

b. $\chi_m\ =\frac{C}{\theta}$

c. $\mathbf{\chi_m\ =\frac{C}{T-\theta}}$

d. $\chi_m\ =\frac{T-\theta}{C}$

27: Which of the following is diamagnetic

a. Water

b. Air

c. Copper sulphate

d. Liquid oxygen

28: The relation between magnetic susceptibility and relative permeability is

a. $\chi\ =\ 1\ -\ \mu_r$

b. $\chi\ =\ 1\ +\ \mu_r$

c. $\mu_r=\ 1\ -\ \chi$

d. $\mathbf{\mu_r==\ 1\ +\ \chi}$

29: The relative permeability of air is

a. 1

b. 1.3

c. 0.5

d. 2

30: The most suitable material for making permanent magnet is

a. Nickel

b. Copper

c. Steel

d. Soft iron

31: Superconductivity was first discovered by

a. Meissner and Schoenfeld

b. C.H. Townes

c. H. Kamerlingh Onnes

d. C.A. Reynolds

32: The metal mercury becomes superconductor at

a. $\mathbf{4.15\ K }$

b. $4.15\ \ \deg c$

c. $4.15\ ^of$

d. $4.15\ R$

33: A superconductor has

a. Zero conductivity

b. Infinite resistivity

c. Infinite conductivity

d. None

34: Magnetic susceptibility of superconductors is given by

a. $\mathbf{\chi\ =\ -1 }$

b. $\chi\ =\ 0$

c. $\ \chi\ =\ 1$

d. $\ \chi\ >>\ 1$

35: The temperature at which a metal becomes super-conducting is called

a. Neel temp

b. Curie’s temp

c. Meissner point

d. Transition temp

36: Superconductivity is usually exhibited at temperatures

a. Low

b. High

c. Very high

d. None of these

37: Which of the property is not exhibited by superconductors

a. µ_r= 0

b. Copper loss = 0

c. $\mathbf{B\neq\ 0 }$

d. $\chi\ =\ -1$

38: According to isotope effect, the transition temperature T_c for superconductor is proportional to

a. $\mathbf{M^{-\frac{1}{2}}}$

b. $M^{-\frac{1}{4}}$

c. $\sqrt M$

d. $-\frac{1}{M}$

39: BCS theory is an attempt to explain

a. Magnetism

b. Superconductivity

c. Thermoelectric effect

d. Heating effect

40: In a particular superconductor, transition takes place gradually, it belongs to

a. Type-I

b. Type-II

c. Type-I and Type-II both

d. None of these

MCQ's with Answers

1: Which method can be used to distinguish between the two types of carriers

2: Current is flowing in two long parallel conductors in the same direction. The conductors · · · each other

3: Cathode rays enter in a uniform magnetic field perpendicular to direction of field. In magnetic field their path will be

4: The force experienced by a charged particle in magnetic field is maximum when particle move in a direction

5: A particle moving in a magnetic field has an increase in its velocity then its radius of circle

6: If relative permeability of a substance is 0.79, then it is · · · material

7: An electron enters a magnetic field acting vertically downward with a velocity v from east. The electron is deflected along

8: A charged particle moves through a magnetic field in a direction perpendicular to it. Then · · · remains unchanged

9: Magnetic dipole moment is defined as

10: Which define the relation between magnetic torque and magnetic dipole moment

11: Resistivity (Ohm – m) of semiconductor varies

12: Semiconductor compound is

13: Orbital of valance conducting band overlap in

14: At 0K the valance band in intrinsic semiconductor is

15: In intrinsic semiconductor rate of generation of carrier’s ‘g” depends on

16: Popping ratio is

17: N-type semiconductors are made by adding

18: Both n and p type doping are charged

19: With increasing depth in valance band the hole probability. . ..

20: Current density and drift velocity depends on

21: The strongest diamagnetic material is

22: The temperature at which ferromagnetic material changes into paramagnetic material is known as

23: Which of the following magnetic substance can have positive permeability and negative susceptibility

24: The susceptibility of diamagnetic material is

25: Paramagnetic susceptibility varies as

26: Curie-Weiss law is

27: Which of the following is diamagnetic

28: The relation between magnetic susceptibility and relative permeability is

29: The relative permeability of air is

30: The most suitable material for making permanent magnet is

31: Superconductivity was first discovered by

32: The metal mercury becomes superconductor at

33: A superconductor has

34: Magnetic susceptibility of superconductors is given by

35: The temperature at which a metal becomes super-conducting is called

36: Superconductivity is usually exhibited at temperatures

37: Which of the property is not exhibited by superconductors

38: According to isotope effect, the transition temperature Tc for superconductor is proportional to

39: BCS theory is an attempt to explain

40: In a particular superconductor, transition takes place gradually, it belongs to

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38: According to isotope effect, the transition temperature T_c for superconductor is proportional to