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Saturday, 18 June 2016

FSc ICS MCAT ECAT Physics Second Year Chapter 17 Physics of Solids Multiple Choice Question (MCQ) Notes

FSc ICS MCAT ECAT Physics Second Year Chapter 17 Physics of Solids Multiple Choice Question (MCQ) Notes

Both Bold and Underlined option is correct

1. Curie temperature is:
  • Different fro chromium oxide and cobalt
  • Same for chromium oxide and cobalt
  • Same for iron and cobalt
  • None of these

2. The steel makes a good permanent magnet and is called:
  • Soft
  • Hard
  • In between
  • None of these

3. Ferromagnetic substances have the small regions are called:
  • Magnets
  • Patches
  • Domains
  • None of these

4. The curie temp for iron is about:
  • 800 degree Celsius
  • 740 degree Celsius
  • 750 degree Celsius
  • 650 degree Celsius

5. The process of introducing a small amount of impurity into the pure semi conductor is called:
  • Overlapping
  • Mixing
  • Doping
  • None of these

6. Which of the following are example of diamagnetic substances?
  • Antimony
  • Cobalt
  • Copper
  • Both first and third

7. Which of the following is not a ferromagnetic substance?
  • Copper
  • Steel
  • Iron
  • Cobalt

8. The permeability of diamagnetic materials:
  • Less than one
  • Greater than one
  • Equal to one
  • Zero

9. The area of hysteresis loop is proportional to the work done in:
  • Magnetizing of the substance
  • Reversing the magnetic field
  • Demagnetizing the substance
  • None of these

10. If a material sets up a magnetic field which opposes the applied magnetic field it is said to be:
  • Electromagnetic
  • Diamagnetic
  • Paramagnetic
  • None of these

11. The domain theory of magnet is important to explain the behaviour of:
  • Diamagnets
  • Paramagnets
  • Ferromagnets
  • All of the above

12. A pentavalent impurity in Si:
  • A free electron and a free hole
  • a free hole
  • a free electron
  • No free particle

13. Unit of Bulk modulus is:
  • No unit
  • N/m(2)
  • N/Pa
  • Pam

14. Formula for strain energy in deformed materials is:
  • EAl1(2)/2L
  • EAl1(2)/2
  • EAl1/3L
  • EAl1/2L(2)

15. At 0 K a piece of silicon is a:
  • Conductor
  • Semi-conductor
  • Insulator
  • All

16. Gallium belongs to _________ group
  • 4 th
  • 2 nd
  • 7 th
  • 3 rd

17. Polythene, polystyrene and nylon etc., are examples of:
  • Crystalline
  • Amorphous
  • Polymers
  • None of these

18. Polymers have ______ specific gravity compared with even the lightest of metals.
  • High
  • Low
  • Zero
  • None of these

19. The strength to weight  ratio of plastic material (chair) is ______ then steel material (chair).
  • Greater
  • Lesser
  • Same
  • All

20. Net charge on n-type material is:
  • Positive
  • Negative
  • Neutral
  • All

21. Energy needed to magnetize and demagnetize is given by:
  • Hysteresis curve
  • Area of loop
  • Coercivity
  • None of these

22. Yttrium bearium copper oxide (YBa2Cu3O7) become superconductor at:
  • 163 K
  • -110 K
  • Both above options
  • None of these

23. Which of the following has the highest elasticity?
  • Rubber
  • Steel
  • Glass
  • All

24. Which of the following has bulk modulus?
  • Water
  • Gas
  • Honey
  • All

25. Out of the following the one which penetrate through 20 cm thick steel plate is:
  • Gamma rays
  • Beat rays
  • Alpha rays
  • Positive rays

26. Crystalline substances mostly exist in:
  • Liquid state
  • Gaseous state
  • Solid state
  • Plasma state

27. Solid have a definite shape on account of:
  • Crystalline structure
  • Small atomic kinetic energy
  • Large atomic kinetic energy
  • Large atomic potential energy

28. Which of the following is not an amorphous structure?
  • Glass
  • Polymers
  • Copper
  • Rubber

29. Conductors, insulators and semiconductors differ from each other due to property of:
  • Ability of the current they carry
  • Formation of crystal lattice
  • Binding energy of their electrons
  • Mutual width of their energy gaps

30. Which of the following is an example of cubic crystal?
  • Calcite
  • Potassium chromate
  • Mercury chloride
  • None of these

31. In an extrinsic semiconductor, the ratio of impurity atoms to that of pure atom is:
  • 1 : 10(8)
  • 10(8) : 1
  • 1 : 10(6)
  • 10(6) : 1

32. The forbidden energy gap in semiconductors:
  • Lies just below the valence band
  • Lies just above the conduction band
  • is the same as the valence band
  • Lies between the valence band and the conduction band

33. In a good conductor, the energy gap between the conduction band and valence band is:
  • Infinity
  • Wide
  • Narrow
  • Zero

34. With rise in temperature the electrical conductivity of intrinsic semiconductor:
  • Increases
  • Decreases
  • First increases and then decreases
  • First decreases and then increases

35. What is the hardest natural substance known?
  • Steel
  • Chromium
  • Tungsten
  • Diamond

36. There is no hole current in good conductors, because they:
  • are full of electron gas
  • have large forbidden gap
  • have no valence band
  • have overlapping valence and conduction bands

37. When a semiconductor is heated its resistance:
  • Decreases
  • Increases
  • Remains the same
  • May increase or decrease depending upon semiconductor

38. The most commonly used semiconductor are:
  • Germanium and silicon
  • Germanium and copper
  • Silicon and glass
  • Glass and ebonite

39. Conductors, semiconductors and insulators are:
  • Work function
  • Width of forbidden energy gap
  • Binding energy of electrons
  • Mobility of electrons

40. In an insulator, the number of electrons in the valence shell, in general, is:
  • Less than 4
  • More than 4
  • Equal to 4
  • None of these

41. The drift velocity of holes as compared to that of electrons is:
  • Less
  • More
  • Equal
  • More or equal

42. The change in the shape of a regular body is due to:
  • Metallic strain
  • Longitudinal strain
  • Bulk strain
  • Shearing strain

43. Energy stored per unit volume in a stretched wire is:
  • (Stress * Strain)/2
  • Stress * Strain
  • Load * Stress
  • (Load * Extension)/2

44. The structure of unit cell is:
  • One dimensional
  • Two dimensional
  • Three dimensional
  • All of these

45. The maximum stress which a body can bear is called:
  • UTS
  • Elastic stress
  • Permanent stress
  • Strain stress

46. In hysteresis when magnetization becomes zero it is:
  • Coercivity
  • Retentivity
  • Saturation
  • Remanance

47. The substance which have partially filled conduction bands are called:
  • Conductors
  • Insulators
  • Semi-conductors
  • Super conductors

48. An example of donor impurity is:
  • Phosphorus
  • Indium
  • Boron
  • Gallium

49. The material whose resistivity becomes zero below a certain temperature:
  • Conductor
  • Semi-conductor
  • Super conductor
  • Insulator

50. Magnetic field produced by spinning nucleus is:
  • Much weaker
  • Much stronger
  • No field
  • All of these

51. Domains contain nearly:
  • 10(8) - 10(10) atoms
  • 10(12) - 10(16) atoms
  • 10(15) - 10(20) atoms
  • None

52. The breaking stress for a wire of unit cross-section is called:
  • Yield point
  • Tensile strength
  • Elastic fatigue
  • Young's modulus

53. Which of the following quantities does not have the unit of force per unit area?
  • Stress
  • Strain
  • Young's modulus
  • Pressure

54. The young's modulus of a perfectly rigid body is:
  • Zero
  • Unit
  • Infinity
  • May have any value

55. The area enclosed by a hysteresis loop is a measure of:
  • Retentivity
  • Suscesptibility
  • Permeability
  • Energy loss

56. The permeability of ferromagneitc substance is:
  • Positive and small
  • Positive and large
  • Negative and small
  • Negative and large

57. Unbalance spin of electron in the atoms is the cause of:
  • Diamagnetism
  • Paramagnetism
  • Ferromagnetism
  • Anti-ferromagnetism

58. A small solid ball of substance is repelled by a pole magnet. The substance may be:
  • Bismuth
  • Aluminium
  • Copper
  • Sodium

59. The type of bonding in Ge crystal is:
  • Ionic
  • Metallic
  • Covalent
  • Van der Waals'

60. If band gap between valence and conduction band material is 5 eV, the material is:
  • An insulator
  • Good conductor
  • Semiconductor
  • Such materials are non-existent

61. In an intrinsic semiconductor:
  • Only electrons are responsible for flow of current
  • Both holes and electrons carry current
  • Both holes and electrons carry current with electrons being majority carriers
  • Only holes are responsible for flow of current

62. Out of following, the intrinsic semiconductor is:
  • Copper
  • Silicon
  • Arsenic
  • Boron

63. The temperature coefficient of resistance of a semiconductor is:
  • Positive always
  • Negative always
  • Zero
  • Infinite

64. The resistivity of intrinsic semiconductor at 0 K is:
  • infinite
  • Zero
  • 1
  • Equal to that at 0 degree Celsius

65. The conductivity of a pure semiconductor can be increased by:
  • Increasing temperature
  • Mixing trivalent impurity
  • Mixing pentavalent impurity
  • All of the above

66. Metals such as copper, iron, zinc are ________ solids.
  • Crystalline
  • Amorphous
  • Polymeric
  • All

67. Conductivity of metals is of the order of:
  • 10(-7) ohm/meter
  • 10 ohm/meter
  • 10(7) per ohm per meter
  • 10(-7) ohm/meter

68. The speed of bullet train can be:
  • 500 km/h
  • 500 km/s
  • 500 m/s
  • 5 km/h

69. Aluminium behaves as super conductor at:
  • 1.18 K
  • 7.8 K
  • 125 K
  • None of these

70. Material which has hysteresis loop of small area is suitable for:
  • Electromagnet
  • Permanent magnet
  • Core of transformer
  • All

Written by: Asad Hussain

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