1. The converse of hardness is known as _______.
2. On which of the following factors does the resistivity of a material depend ?
3. ________ is a negatively charged particle present in an atom.
4. The formula ____ determines the number of electrons that can be accommodated in any level.
5. The tiny block formed by the arrangement of a small group of atoms is called the
6. The co-ordination number of a simple cubic structure is
7. The covalent bond is formed by _______.
8. A perfect conductor has _______.
9. The metal having the lowest temperature coefficient of resistance is
10. Commonly used conducting materials are
11. Which of the following materials is preferred for transmitting electrical energy over long distance ?
12. The kinetic energy of a bounded electron is _______.
13. A highly conductive material must have
14. The conductivity of a conductor can be increased by
15. Superconductivity is observed for ______.
16. The superconductivity is due to _______.
17. The value of critical field below the transition temperature will
18. In a superconductor the value of critical density depends upon
19. Superconductors are becoming popular for use in
20. High resistivity materials are used in _______.
21. Mercury as an electric contact material is
22. An H.R.C. fuse is ________.
23. Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
24. The coils of D.C. motor starter are wound with wire of
25. The conductors have transport phenomena of electrons due to
26. The transition temperature of mercury is ________.
27. By increasing impurity content in the metal alloy the residual resistivity always
28. The structure sensitive property of a super conductor is
29. At transition temperature the value of critical field is
30. Which of the following variety of copper has the best conductivity ?
31. Constantan contains ________.
32. Which of the following is the poorest conductor of electricity ?
33 ______ has zero temperature co-efficient of resistance.
34. Piezoelectric materials serve as a source of _____ .
35. In thermocouples which of the following pairs is commonly used ?
36 ________ is viscoelastic.
37. Carbon electrodes are not used in
38. Solder is an alloy of _______.
39 ______ is most commonly used for making magnetic recording tape
40. Overhead telephone wires are made of ______.
41. ______ is an example of piezoelectric material.
42. _____ is the main constituent of glass.
43. A good electric contact material should have all of the following properties except
44. Most of the common metals have _____ structure.
45. Which of the following affect greatly the resistivity of electrical conductors ?
46. Thermonic emission occurs in _______.
47. _____ is a hard solder.
48. Addition of 0.3 to 4.5% silicon to iron _____ the electrical resistivity of iron.
49. Super conductivity can be destroyed by _______.
50. Non-linear resistors ________.
51. A carbon resistor contains ________.
52. Which of the following materials does not have covalent bonds ?
53. In graphite, bonding is ______.
54. Total number of crystal systems is _______.
55. The number of atoms per unit cell in B.C.C. structure is
56. The conductivity of a metal is determined by ______.
57. The resistivity of a metal is a function of temperature because
58. In a crystal, an atom vibrates at a frequency determined by
59. Due to which of the following reasons aluminium does not corrode in atmost phere ?
60. The impurity atoms is semiconductors
61. Which of the following material is not a semiconductor ?
62. Carbon resistors are used extensively because they are
63. Carbon rods are used in wet and dry cells because
64. Due to which of the following factors the brush wear rate is altered ?
65. Which of the following are non-conductors of electricity?
66. Carbon bearings are used under which of the following conditions ?
67. Which of the following high resistance materials has the highest operating temperature ?
68. Steel wire is used as _______.
69. Low resistivity materials are used in _______.
70. Platinum is used in ______.
71. Which of the following is an advantage of stranded conductor over equivalent single conductor ?
72. Due to which of the following reasons copper and aluminium are not used for heating elements ?
73. Copper, even though costly, finds use in the windings of electrical machines because
74. Which of the following materials is used for making coils of standard resistances ?
75. Substances whose specific resistance abruptly decreases at very low temperature are called
76. Which of the following materials is the best conductor of electricity ?
77. _______ is the property of absorbing moisture from atmosphere.
78. Thermocouples are mainly used for the measurement of ______.
79. Due to which of the following fact, in India, aluminium is replacing copper ?
80. The conduction of electricity, in semiconductors, takes place due to movement of
81. Which of the following is a semiconductor material ?
82. Selenium is _____ semiconductor.
83. ________ has the best damping properties.
84. The photo-electric effect occurs only when the incident light has more than a certain critical
85. If the resistance of a conductor does not vary in accordance with Ohm's law it is known as
86. Spark plug makes use of which of the following materials for insulation ?
87. The forbidden gap in an insulator is ______.
88. Which of the following factors affect resistivity of metals ?
89. Effect of moisture on the insulating materials is to _______.
90. Surface resistance of an insulating material is reduced due to the
91. Superconducting metal in super conducting state has relative permeability of
92. In conductors conduction of electricity takes place due to movement of
93. The carbon percentage is least in _______.
94. For a particular material the Hall coefficient was found to be zero. The material is
95. The conductivity of an extrinsic semiconductor with temperature
96. The current due to electron flow in conduction band is the hole current in valence band.
97. For a hole which of the following statements is incorrect ?
98. _______ is an element used in semiconductors whose atoms have three valence electrons.
99. The minority carrier concentration is largely a function of
100. For germanium the forbidden energy gap is _______.
2. On which of the following factors does the resistivity of a material depend ?
3. ________ is a negatively charged particle present in an atom.
4. The formula ____ determines the number of electrons that can be accommodated in any level.
5. The tiny block formed by the arrangement of a small group of atoms is called the
6. The co-ordination number of a simple cubic structure is
7. The covalent bond is formed by _______.
8. A perfect conductor has _______.
9. The metal having the lowest temperature coefficient of resistance is
10. Commonly used conducting materials are
11. Which of the following materials is preferred for transmitting electrical energy over long distance ?
12. The kinetic energy of a bounded electron is _______.
13. A highly conductive material must have
14. The conductivity of a conductor can be increased by
15. Superconductivity is observed for ______.
16. The superconductivity is due to _______.
17. The value of critical field below the transition temperature will
18. In a superconductor the value of critical density depends upon
19. Superconductors are becoming popular for use in
20. High resistivity materials are used in _______.
21. Mercury as an electric contact material is
22. An H.R.C. fuse is ________.
23. Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
24. The coils of D.C. motor starter are wound with wire of
25. The conductors have transport phenomena of electrons due to
26. The transition temperature of mercury is ________.
27. By increasing impurity content in the metal alloy the residual resistivity always
28. The structure sensitive property of a super conductor is
29. At transition temperature the value of critical field is
30. Which of the following variety of copper has the best conductivity ?
31. Constantan contains ________.
32. Which of the following is the poorest conductor of electricity ?
33 ______ has zero temperature co-efficient of resistance.
34. Piezoelectric materials serve as a source of _____ .
35. In thermocouples which of the following pairs is commonly used ?
36 ________ is viscoelastic.
37. Carbon electrodes are not used in
38. Solder is an alloy of _______.
39 ______ is most commonly used for making magnetic recording tape
40. Overhead telephone wires are made of ______.
41. ______ is an example of piezoelectric material.
42. _____ is the main constituent of glass.
43. A good electric contact material should have all of the following properties except
44. Most of the common metals have _____ structure.
45. Which of the following affect greatly the resistivity of electrical conductors ?
46. Thermonic emission occurs in _______.
47. _____ is a hard solder.
48. Addition of 0.3 to 4.5% silicon to iron _____ the electrical resistivity of iron.
49. Super conductivity can be destroyed by _______.
50. Non-linear resistors ________.
51. A carbon resistor contains ________.
52. Which of the following materials does not have covalent bonds ?
53. In graphite, bonding is ______.
54. Total number of crystal systems is _______.
55. The number of atoms per unit cell in B.C.C. structure is
56. The conductivity of a metal is determined by ______.
57. The resistivity of a metal is a function of temperature because
58. In a crystal, an atom vibrates at a frequency determined by
59. Due to which of the following reasons aluminium does not corrode in atmost phere ?
60. The impurity atoms is semiconductors
61. Which of the following material is not a semiconductor ?
62. Carbon resistors are used extensively because they are
63. Carbon rods are used in wet and dry cells because
64. Due to which of the following factors the brush wear rate is altered ?
65. Which of the following are non-conductors of electricity?
66. Carbon bearings are used under which of the following conditions ?
67. Which of the following high resistance materials has the highest operating temperature ?
68. Steel wire is used as _______.
69. Low resistivity materials are used in _______.
70. Platinum is used in ______.
71. Which of the following is an advantage of stranded conductor over equivalent single conductor ?
72. Due to which of the following reasons copper and aluminium are not used for heating elements ?
73. Copper, even though costly, finds use in the windings of electrical machines because
74. Which of the following materials is used for making coils of standard resistances ?
75. Substances whose specific resistance abruptly decreases at very low temperature are called
76. Which of the following materials is the best conductor of electricity ?
77. _______ is the property of absorbing moisture from atmosphere.
78. Thermocouples are mainly used for the measurement of ______.
79. Due to which of the following fact, in India, aluminium is replacing copper ?
80. The conduction of electricity, in semiconductors, takes place due to movement of
81. Which of the following is a semiconductor material ?
82. Selenium is _____ semiconductor.
83. ________ has the best damping properties.
84. The photo-electric effect occurs only when the incident light has more than a certain critical
85. If the resistance of a conductor does not vary in accordance with Ohm's law it is known as
86. Spark plug makes use of which of the following materials for insulation ?
87. The forbidden gap in an insulator is ______.
88. Which of the following factors affect resistivity of metals ?
89. Effect of moisture on the insulating materials is to _______.
90. Surface resistance of an insulating material is reduced due to the
91. Superconducting metal in super conducting state has relative permeability of
92. In conductors conduction of electricity takes place due to movement of
93. The carbon percentage is least in _______.
94. For a particular material the Hall coefficient was found to be zero. The material is
95. The conductivity of an extrinsic semiconductor with temperature
96. The current due to electron flow in conduction band is the hole current in valence band.
97. For a hole which of the following statements is incorrect ?
98. _______ is an element used in semiconductors whose atoms have three valence electrons.
99. The minority carrier concentration is largely a function of
100. For germanium the forbidden energy gap is _______.
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