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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 GPS device in an automobile uses which communication channel?

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

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3. The audio signals of TV are

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4. The threshold frequency is the frequency below which :

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

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

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7. Transformer is a device to convert 

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

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

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10. Which phenomena shows the particle nature of light?   

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11. 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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12. 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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13. The best material for the core of a transformer is

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14. Electrical Pressure is also called

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

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16. Quality of transmission depends upon

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17. A transformer 

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

 

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20. A Step-Up transformer increases

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

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22. Proton carry a

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

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

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25. A transformer works on the principle of 

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

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27. Alternating current is converted into direct current by a

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28. The energy of a photon varies directly with its

 

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

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

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

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32. The wave like properties of electrons are useful in

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33. A dynamometer wattmeter can be used for

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34. The reverse effect of X–ray emission is

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35. What frequency range is the high frequency band?

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36. Which sources produce alternating current (AC)?

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37. Low voltage cables are meant for use up to   

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

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39. Super conductors are substances that 

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

 

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

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42. The device which converts AC to DC is

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43. Speed regulation of synchronous motor is   

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

 

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

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46. In AC circuits, AC meters measure 

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

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48. Bandwidth is the

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

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50. An atom with more neutrons than protons is called

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51. In an optical fibre the signal is transmitted 

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52. 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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53. 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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54. The force that binds the neutrons and protons in a nucleus is called as:

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55. Electrons carry a

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56. The frequency of direct current is ________

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57. Which electromagnetic radiation is used for satellite communication ? 

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

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59. 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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60. 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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61. Which of the following experiments analyzed the Fraunhofer lines of the solar spectrum?

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62. Who was the first scientist to discover Electrons?

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63. Circuit breaker usually operate under   

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64. Which of the following has the lowest frequency? 

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65. Carbon Arc lamps are commonly used in

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66. Photon is the fundamental unit/quantum of   

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

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

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

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70. Erg cross Sec is the unit of

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71. The Capacity of a communication channel is measured in 

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

 

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

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74. At low temperature, Lead behaves as a : 

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75. Resistance of human body in dry condition

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

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

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

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79. When an atom loses an electron it becomes

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80. Who discovered X-ray? 

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81. Modem is used mostly for ?

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82. A multimeter is used to measure

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

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84. 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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85. Atomic hydrogen has a life period of

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86. Negative feedback in amplifiers   

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87. 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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88. In superconductors, the energy gap is due to

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89. Kirchhoff’s laws are applicable to

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90. A television channel is characterised by

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91. 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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92. Kirchoff’s Voltage Law is known as

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93. What is a neuron ?

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

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

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

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97. A wire carrying current is

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98. Which compressor is usually used in AC?

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

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100. Superconductors are those elements

 

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