Magnetism and Electromagnetism1. The origin of magnetism is

a. Ironb. Steelc. Moving charged. None of these

2. The poles of magnet are similar to

a. Geo polesb. Opposite to geo polesc. Perpendicular to geo poles d. None

3. A moving charge is surrounded by

a. 2 fieldsb. 3 fieldsc. 4 fieldsd. None

4. A photon while passing though a magnetic field are deflected towards

a. North poleb. South polec. Are ionizedd. None

5. Iron is what type of magnetic material, it is

a. Diamagneticb. Paramagneticc. Ferromagneticd. Non-magnetic

6. Magnetism is related to

a. Stationary charges b. Moving charges c. Stationary and moving charge d. Law of motion

7. if the angle b/w and B is zero then magnetic force will be

a. Maxb. Minc. Zerod. None

8. when charge particle enter perpendicular to magnetic field, the path followed by it is

a. A helixb. A circlec. Straight lined. Ellipse

9. The S.I. unit of magnetic flux is

a. Teslab. Weber c. Jouled. Newton

10. Tesla is the unit of

a. Electric field b. Magnetic fieldc. Magnetic field intensityd. Electric field intensity11. It is possible to set a charge at rest into motion with magnetic field

a. Yesb. Noc. Some Timed. None

12. A current carrying conductor carries current away from you the direction of magnetic field with respect to you is

a. Away from youb. Towards youc. Clock wise d. Anti clockwise

13. The shape of magnetic field around a long straight current carrying wire is

a. Electrical b. Squirec. Varies with current d. Circular

14. one Tesla is equal to

a. 104Gb. 10-4Gc. 106Gd. 10-6G

15. The flux through an area of 1 m2 in x -y plane in a magnetic filed of 1T directed along Z -axis will be

a. Zerob. 1 wbc. 0.5 webd. None

16. The toque in the coil can be increased by increasing

a. No, of tarns b. Current and magnetic fieldc. Area of coil d. All of above

17. A current carrying loop, when placed in a uniform magnetic field will experiencea. Electric fluxb. Torquec. Magnetic fluxd. Force

18. The magnetic flux will be max, for an angle of

a. 0ob. 60oc. 90od. 180o

19. The Weber and Maxwell are unit of measure of

a. Conductance b. Electric currentc. Magnetic fluxd. Electric flux

20. One weber is equal to

a. N.A2/Ab. N.m2/Ac. N.A/md. N.m/A

21. An electron moves at 2x102m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force

a. 1 x 10-6Nb. 6.4 x 10-17Nc. 3.6 x 10-24Nd. 4 x 106N

22. The waveform of sinusoidal voltage, its frequency and phase can be found by

a. CROb. Diodec. Transistord. Radio

23. The force on a charge particle moving parallel to magnetic field is

a. Maximumb. Minimumc. Zerod. None

24. The presence of magnetic field around a current carrying conductor was detected by

a. H. orestedb. Ampere c. Weberd. Henry25. Amperes law is applicable to

a. Circular pathb. Rectangular path c. To any pathd. None

26. The unit of permiability of free space is

a. T.m/Ab. T.m2/Ac. T.m/A2d. None

27. The value of is

a. 4 x 10-6b. 4 x 10-7c. 4 x 10-8d. 4 x 10-9

28. The magnetic induction of solenoid is

a. NIb. NLc. Nd. None

29. A solenoid of length 500m is wonded into 100 turns. A current of 10 A flows in it, the magnetic field intensity is

a. 20 b. 200 c. 2000 d. None

30. When charge particle enters in the uniform magnetic field, the magnetic force will be balance by

a. Electric forceb. Magnetic forcec. Centripetal forced. None

31. The frequency of cyclotron is given by

a. f = b. f = c. f = d.

32. the e/m value of electron is

a.1.7588 x 1011 b.1.75599 x 1012 c.1.7588 x 109 d. 1.7559 x 1014

33. F = Fe + Fm is

a. Electric forceb. Magnetic forcec. Lorentz forced. None

34. The main part of C.R.O is

a. Twob. Threec. Fourd. Five

35. In C.R.O. the deflecting plats are

a. Twob. Threec. Fourd. None

36. The material used in fluorescent screen is

a. Electricb. Magneticc. Phosphorsd. None

37. The value of restoring torque in galvanometer is

a.

b.

c. d. None

38. In the galvanometer the current is proportional to

a. Magnetic fieldb. Electric fieldc. Angle d. None

39. When a small resistance is connected in parallel to the galvanometer it is called

a. Ammeter b. Voltmeterc. AVO meter d. None

40. To find the shunt resistance we used equation

a. Rs = b. Rs = c. Rs = d. Rs =

41. To convert a galvanometer into voltmeter we connect a resistance in

a. Series b. Parallelc. Series or paralleld. None

42. AVO-meter is used to find

a. Currentb. Voltagec. Resistanced. All of above43. An ideal voltmeter has

a. Small resistanceb. High resistancec. Infinite resistanced. None

44. an ammeter can be more sensitive if C/BAN is made

a. Very largeb. Very smallc. Unalteredd. None

45. To increase the scale of galvanometer to twice of its initial value we need to connect a shunt

a. Rs = Rgb. Rs < Rgc. Rs > Rgd. None

46. Which of the following is a hard magnet?

a. Ironb. Nickelc. Steeld. All of them

47. Ammeter and galvanometer

a. Are always connected in seriesb. Are always connected in parallelc. Both in series and paralleld. None

48. The sensitivity of galvanometer is directly depends ona. Magnetic field b. Area of coilc. Number of turnsd. All of above

49. One Tesla is also equal to

a. web.m2b. web.m-2c. web.md. None

50. The dot product of magnetic field are area is called

a. Electric fluxb. Magnetic fluxc. Ampere lawd. None51. One Henry is equal to

a. V. sec/A b. V.A/secc. A.sec/V d. None

52. The S.I unit of Magnetic Permeability is

a. web/m2 b. web A/m c. web m/A d. None of these

53. Shunt resistor is also calleda. By pass resistorb. Specific resistor c. Reactance d. None

54. Synchronization controls of CRO are used to synchronize

a. Frequencyb. Current c. Voltaged. All of them

55. In C.R.O the anode are at positive potential with respect to cathode is

a. very highb. highc. lowd. very low

56. The e/m value for an electron is

a. b.

c. d.

57. C.R.O is same as

a.Radiob.TV Picture tubeb.Transistorc.None

58. Heating a magnet will

a.Weaken it b.Strength it c.Reverse its polarityd.Demagnetize completely

59. Minimum current require to produced a deflection of 1mm on a scale at a distance of 1mm is

a.0.1Ab.1Ac.current sensitivityd.1mA60. 1 weber = _______

a.106 Maxwellb.108 Maxwellc.1010 Maxwellc.none

61. When the number of turns in a solenoid is doubled without any change in the length of the solenoid its self induction will be:a) Four timesb) Doubledc) Halvedd) None

62. The potential difference across the shunt resistor Rs is

a) b)

c) d)

63. In multi range ammeter

a) Resistances of different values are connected in series with galvanometerb) Different resistances are connected in parallel with galvanometerc) Some resistances are connected in parallel and some of them are connected in seriesd) None

64. The S.I unit of magnetic permeability is

a) TmA-2b) TmA-1c) Fm-1d) None of these

65. A solenoid is a cylindrical, long and tightly wound coil of wire. When a current pass through it behaves like a

a) Source of emfb) Magnetc) Electromagnetd) None of these

66. The brightness of the spot formed on the screen in controlled by the

a) Electron b) Proton c) Potential d) None of these

67. Due to radial field, a moving coil galvanometer is

a) Comes to rest quickly b) Magnetic field becomes strongc) Movement is frequent d) None of these68. A very high resistor Rh is connected in series with the galvanometer in order to convert it into voltmeter

a) b)

c) d)

69. Magnetic flux passing normally, through a unit area is called

a) Magnetization b) Magnetic field intensity c) Magnetic flux density d) All of these

70. The relation between Tesla ( T ) and Gauss (G) is given as

a) 1T = 104Gb) 1T = 106Gc) 1T = 10-4Gd) 1T = 10-6G

71. Couple necessary to produce unit twist is

a) Deflecting couple b) Restoring couplec) Torsion coupled) None of these

72. In velocity selector method, the velocity of an electron is given by

a) b)

c) d)

73. The beam of the electrons is provided by

a) Ionization of atomsb) Photoemission c) Electron gund) None of these

74. The resistance of a voltmeter should have a very high resistance

a) It does not disturb the circuitb) It draws some currentc) It same the galvanometer coild) None of these

75. The wave form of sinusoidal voltage, its frequency and phase can be found by a) CROb) Diodec) Transistord) Radio

76. The shunt resistance connected to a Galvanometer to convert it into a desired level current measuring ammeter is

a) b)

c) d) None

77. A vertical solenoid has 200 turns in a length of 0.4m and carries a current of 3A in anticlockwise. The flux density in the middle in Tesla is about

a) b)

c) d) None 78. The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is1.31.25 V2.1,000 V2,000 V4.3,125 V79. The unit for permeability is1.Wb/At m2.At/m3.At/Wb4.Wb80. The ability of a material to remain magnetized after removal of the magnetizing force is known as1.hysteresis2.permeability3.retentivity4.reluctance81. A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will1.increase2.remain constant3.be excessive4.decrease82. When the north poles of two bar magnets are brought close together, there will be1.a downward force2.a force of repulsion3.a force of attraction4.no force83. What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At m?1.0.001111 At/Wb2.111 At/Wb3.1 At/Wb4.11 At/Wb84. An electromagnetic field exists only when there is1.decreasing current2.an increasing current3.current4.voltage

85. A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?1.2702.1803.904.36086. The unit for reluctance is1.tesla2.Wb3.At/m4.At/Wb87. The direction of a magnetic field within a magnet is1.from south to north2.back to front3.from north to south4.front to back88. When the current through the coil of an electromagnet reverses, the1.direction of the magnetic field remains unchanged2.magnetic field expands3.direction of the magnetic field reverses4.magnetic field collapses89. When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage1.increases2.decreases3.reaches zero4.remains constant90. If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density1.increases2.doubles3.decreases4.remains the same91. For a given wirewound core, an increase in current through the coil1.reverses the flux lines2.causes no change in flux density3.decreases the flux density4.increases the flux density92. What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?1.18.75 At2.30 At3.300 At4.187 At93. If the steel disk in a crankshaft position sensor has stopped with the tab in the magnets air gap, the induced voltage1.increases2.decreases3.is zero4.will remain constant

94. The induced voltage across a stationary conductor in a stationary magnetic field is1.decreased2.reversed in polarity3.zero4.increased95. When a solenoid is activated, the force that moves the plunger is1.a permanent magnetic field2.a steady current3.an electromagnetic field4.varying voltage96. What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?1.2.4 At2.2,400 At3.240 At4.24 At97. If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage1.increases2.reverses polarity3.decreases4.remains unchanged