Quiznetik

Electromagnetic Field | Set 1

1. A scalar quantity has __________.

Correct : A. magnitude

2. Which of the following is/are scalar quantity(s)?

Correct : D. all of these

3. Which of the following is not a scalar quantity?

Correct : B. displacement

4. A vector quantity has __________.

Correct : C. both (a) and (b)

5. Which of the following is/are vector quantity(s)?

Correct : D. all of these

6. A unit vector has its magnitude as ____________.

Correct : B. 1

7. A unit vector has _______ direction to that of the main vector.

Correct : A. same

8. A vector P in Cartesian coordinates is represented by ____________.

Correct : B. (Px, Py, Pz)

9. ________ of two vectors uses the Law of Parallelogram.

Correct : C. addition

10. Multiplication of two vectors is __________.

Correct : C. either vector or scalar

11. If two vectors are orthogonal, then their scalar product is __________.

Correct : B. 0

12. ___________ product is governed by the Right-Hand Screw Rule.

Correct : A. vector

13. The vector product obeys the __________ law.

Correct : C. Distributive

14. The cross product of the same vector to itself is ____________.

Correct : A. 0

15. ____________ product of two unit vectors is the third unit vector.

Correct : A. vector

16. 'r' in Cylindrical coordinates corresponding to Cartesian coordinate (3, 4, 5) is ____________.

Correct : D. 5

17. In a Cartesian coordinate system, axes x, y and z are at __________ to each other.

Correct : B. 90°

18. Cartesian coordinates are represented in terms of ___________.

Correct : C. (x, y, z)

19. Cylindrical coordinates are represented in terms of ____________.

Correct : A. (r, φ, z)

20. Spherical coordinates are represented in terms of ___________.

Correct : B. (r, θ, φ)

21. In Cylindrical coordinate systems, unit vector ar is __________.

Correct : C. both (a) and (b)

22. Cylindrical coordinate 'r' is related to the Cartesian coordinate as __________.

Correct : D. (x2 + y2)1/2

23. Cylindrical coordinate 'z' is related to the Cartesian coordinate as __________.

Correct : B. z

24. In a Spherical coordinate system, φ is ____________.

Correct : B. azimuthal angle

25. Spherical coordinate system is a _________.

Correct : A. right-handed syste.

26. In a Spherical coordinate system, φ is given as _________.

Correct : C. tan−1(y/x)

27. In a Spherical coordinate system, r is given as ___________.

Correct : C. (x2 + y2 + z2)1/2

28. For transformation from the Cartesian coordinate system to Spherical coordinate system, ap should be equal to ____________.

Correct : A. cos θ

29. In terms of Spherical coordinate system variables, y of Cartesian coordinate system is given as __________.

Correct : B. r sin θ sin φ

30. In the Cylindrical coordinate system, z ranges between____________.

Correct : D. −∞ and ∞

31. In the Cylindrical coordinate system, φ ranges from _____________.

Correct : B. 0 to less than 2π

32. Line integral involves _________ product.

Correct : A. scalar

33. Del operator is ______________.

Correct : C. both (a) an (b)

34. Gradient represents the __________ of maximum space rate of increase of a scalar field.

Correct : C. both (a) an (b)

35. (AB) is equal to ___________.

Correct : D. B A + A B

36. An is equal to _____________.

Correct : B. nAn−1 A

37. Divergence of a vector at a point in a vector field is __________ quantity.

Correct : B. scalar

38. Divergence of vector field is net outward flux of a vector per unit ______.

Correct : B. volume

39. Divergence at a point is positive if field lines are _________

Correct : A. diverging

40. If the rate at which field lines enter into a small volume and also leave, then divergence is ________.

Correct : C. 0

41. Divergence Theorem is applicable for a ________ that is bounded by a _________.

Correct : A. volume, surface

42. Divergence Theorem relates ________ integral to __________ integral.

Correct : A. surface, volume

43. Curl measures _________.

Correct : C. both (a) and (b)

44. Stoke's Theorem relates, ______ integral to a _______ integral.

Correct : C. line, surface

45. Laplacian operator ________.

Correct : C. can be a scalar or vector function

46. Laplacian of a scalar is __________.

Correct : A. scalar

47. Laplacian of a vector is ___________ of gradient of its divergence and its curl of curl.

Correct : B. difference

48. A scalar field is harmonic in a given region, if its Laplacian is __________.

Correct : D. 0

49. Metals have their conductivity "σ" _________.

Correct : A. >>1

50. Insulators have their conductivity "σ" _________.

Correct : B. <<1

51. Electrostatic field is _________ a perfect conductor.

Correct : C. zero inside

52. Potential is _________ a perfect conductor.

Correct : A. same inside

53. As per Gauss' Law, charge density inside a perfect conductor is zero if E is _________.

Correct : D. zero

54. Conductivity of dielectric is _________.

Correct : A. low

55. Which of the following is not a non-polar dielectric?

Correct : B. oxygen

56. The direction of electric dipole moment is _________ applied electric field.

Correct : C. same

57. Electric polarization of a material is electric dipole moment per unit _________.

Correct : B. area

58. Capacitor stores energy in _________ field.

Correct : A. electric

59. Inductor stores energy in ________ field.

Correct : B. magnetic

60. Which of the following is not an inductor?

Correct : D. none of these

61. Magnetic field at any point inside a long solenoid is _________.

Correct : C. constant

62. A toroid is _________ solenoid.

Correct : A. a long

63. For a medium to be a quasi-conductor, the dissipation factor should be _________.

Correct : C. unity

64. Loss tangent is the same as _________.

Correct : D. dissipation factor

65. Loss tangent is given as _________.

Correct : A. σ/ωε

66. Loss tangent approximates _________.

Correct : D. all of these

67. The combined effect of electric dipoles is seen in _________.

Correct : A. polarization

68. The combined effect of magnetic dipoles is seen in _________.

Correct : B. magnetization

69. Permeability of vacuum is given as _________.

Correct : A. 4 × 10−7 H/m

70. Magnetic susceptibility is _________.

Correct : B. dimensionless

71. Dipole moment is _________ a right-hand screw, when it is moved in the current's direction in a current loop.

Correct : C. in the direction of

72. On the basis of magnetic behaviour, materials are classified into _________ categories.

Correct : D. 5

73. Maxwell's equations involve_______.

Correct : D. All of these

74. ε0 is ________ F/m.

Correct : A. 8.854 × 10−12

75. Electric dipole is a pair of __________ and __________ point charges.

Correct : C. Equal and opposite

76. Electric flux density________medium.

Correct : B. Independent of

77. If work done Wmn is zero, then VN and VM are related as _______.

Correct : B. VN − VM = 0

78. Charge distribution symmetry can be of _______ type.

Correct : D. All of these

79. Curl of electrostatic field is __________.

Correct : C. 0

80. As per Stoke's Theorem, = _________.

Correct : C. 0

81. Potential energy _____ if a test charge is moved from a lower potential point to a higher potential point.

Correct : B. Increases

82. In the case of a linear material medium, _________ equation can be derived easily from Gauss' law.

Correct : C. Both (a) and (b)

83. According to the method of images, the tangential component of electric field to conductor surface is __________.

Correct : B. Zero

84. Steady magnetic fields are governed by __________ law.

Correct : C. Both (a) and (b)

85. There will be force of attraction between two current-carrying conductors if the currents are in __________ direction.

Correct : A. Same

86. Lorentz force equation comprises __________ and __________ forces.

Correct : A. Electric, magnetic

87. Magnetic dipole moment is a product of __________.

Correct : C. Current, area and its direction

88. According to Faraday's __________ Law, as long as changes happen in magnetic flux, induced emf persists.

Correct : A. First

89. According to __________ Law, induced current acts to produce an opposing flux.

Correct : B. Lenz's

90. Biot–Savart's Law can be applied to __________ length current- carrying conductors.

Correct : D. Very small

91. Ampere's Circuital Law is analogous to __________ Law in electrostatics.

Correct : B. Gauss's

92. Ampere's Circuital Law can be applied __________ the conductor.

Correct : C. Both (a) and (b)

93. Magnetic flux density is the same as __________.

Correct : C. Both (a) and (b)

94. Total flux passing through a closed surface held in a magnetic field is __________.

Correct : B. Zero

95. __________ gradient of magnetic scalar potential gives magnetic field intensity.

Correct : B. Negative

96. Magnetization volume current density in magnetic materials is due to __________.

Correct : C. Both (a) and (b)

97. Maxwell's equations shelter on __________ law(s).

Correct : D. All of these

98. Conduction current through a wire is __________ displacement current in capacitor.

Correct : A. Same as

99. In empty space, conduction current is __________.

Correct : C. Zero

100. Emf is closed __________ integral of non-conservational electric field that is generated by battery.

Correct : A. Line