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Physics – General – LS

Physics – Set 12

Dear ! This is Physics – Set 12  Quiz and it contains 100 questions.

Happy Learning!

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1. The ”Choke’ used with a tube light is basically 

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2. Which compressor is usually used in AC?

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3. The resistance of the human body (dry condition) is of the order of

 

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4. The best material for the core of a transformer is

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5. Bandwidth is the

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6. Sending a frame to a group of stations is known as

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7. A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If rg and ra are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?

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8. What is the name of the device used to convert alternating current into direct current ?   

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9. A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?

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10. A transformer 

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11. Erg cross Sec is the unit of

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12. According to the quantum theory of light, the energy of light is carried in discrete units are called

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13. In an optical fibre the signal is transmitted 

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14. Who discovered X-ray? 

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15. A device used for converting a.c. into d.c. is called

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16. What is a neuron ?

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17. Proton carry a

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18. In radio-communication, the signals emitted by transmitting antenna are reflected on

 

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19. A television channel is characterised by

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20. Who indirectly determined the mass of the electron by measuring the charge of the electron? 

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21. What is the full form of ”AM’ regarding radio broadcasting?

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22. Which of the following is not true about X-rays?

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23. Super conductors are substances that 

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24. Circuit breaker usually operate under   

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25. Superconductors are those elements

 

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26. Which of the following is the fastest communication channel?

 

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27. If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to ________.   

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28. Which component of an IED creates an electrical charge?

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29. The device which transfer the signal from low resistance region to high resistance region is 

 

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30. The reverse effect of X–ray emission is

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31. Choose the most appropriate answer: In which atmospheric layer are the communication satellites located?

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32. Speed regulation of synchronous motor is   

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33. The audio signals of TV are

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34. The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ? 

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35. In AC circuits, AC meters measure 

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36. In a optical fibre cable, the signal is propagated along the  

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37. Modem is used mostly for ?

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38. An atom with more neutrons than protons is called

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39. Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be 

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40. A galvanometer can be converted into a voltmeter by connecting with it a 

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41. The force that binds the neutrons and protons in a nucleus is called as:

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42. What frequency range is the high frequency band?

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43. A transformer works on the principle of 

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44. The device which converts AC to DC is

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45. Who was the first scientist to discover Electrons?

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46. What part of the atom has a positive charge?

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47. The frequency used in TV and radar system lies in

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48. Which of the following supports particle nature of photons ?

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49. The energy of a photon varies directly with its

 

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50. A galvanometer can be converted to a voltmeter by connecting

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51. Waves that are required for long distance wireless communication are 

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52. Radio waves sent out by a radio stations are reflected by

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53. Atomic hydrogen has a life period of

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54. The purpose of choke in a fluorescent lamp is :

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55. Carbon Arc lamps are commonly used in

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56. According to Rutherford’s atomic model, the electrons inside an atom are

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57. Alternating current is converted into direct current by a

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58. A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf’s is : 

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59. When an atom loses an electron it becomes

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60. Which of the following was the first theory of superconductivity?

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61. Electrical Pressure is also called

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62. For photoelectric effect to take place, the metal used as the cathode should have ________   

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63. Negative feedback in amplifiers   

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64. At low temperature, Lead behaves as a : 

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65. A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become

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66. Resistance of human body in dry condition

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67. Kirchhoff’s laws are applicable to

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68. The Capacity of a communication channel is measured in 

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69. Kirchoff’s Voltage Law is known as

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70. In superconductors, the energy gap is due to

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71. Why does’nt the hydrogen atom emit X-rays?

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72. A dynamometer wattmeter can be used for

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73. Quality of transmission depends upon

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74. What is the size of Electron as comapared to Proton and Neutron?

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75. Which of the following experiments analyzed the Fraunhofer lines of the solar spectrum?

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76. Electrons carry a

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77. Transformer is a device to convert 

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78. The sharpness of a television image is termed as its

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79. The wave like properties of electrons are useful in

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80. Certain substances loose their electrical resistance completely at super low temperature. Such substances are called.

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81. The layer of atmosphere used for radio-wave transmission is

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82. The frequency of direct current is ________

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83. The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by

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84. Photon is the fundamental unit/quantum of   

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85. An electron and a proton starting from rest get accelerated through potential difference of 100 kV. The final speed of the electron and the proton are Ve and Vp respectively. Which of the following relations is correct?   

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86. Which sources produce alternating current (AC)?

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87. The working of the quartz crystal in the watch is based on the

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88. The GPS device in an automobile uses which communication channel?

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89. A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

 

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90. Which of the following has the lowest frequency? 

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91. Which among the following waves is used for communication by artificial satellites ?

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92. Low voltage cables are meant for use up to   

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93. Which of the following is preferred for accelerating electrons? 

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94. The threshold frequency is the frequency below which :

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95. A wire carrying current is

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96. Which phenomena shows the particle nature of light?   

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97. A multimeter is used to measure

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98. Which of the following is a device designed to protect electrical devices from voltage spikes?

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99. Which electromagnetic radiation is used for satellite communication ? 

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100. A Step-Up transformer increases

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