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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. What part of the atom has a positive charge?

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

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

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

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6. Which electromagnetic radiation is used for satellite communication ? 

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7. Transformer is a device to convert 

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8. The wave like properties of electrons are useful in

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

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10. 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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11. Who discovered X-ray? 

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12. Speed regulation of synchronous motor is   

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

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14. Super conductors are substances that 

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15. A Step-Up transformer increases

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

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17. In an optical fibre the signal is transmitted 

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

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19. Superconductors are those elements

 

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

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

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

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

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24. 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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25. Which of the following supports particle nature of photons ?

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26. 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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27. Photon is the fundamental unit/quantum of   

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28. 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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29. Negative feedback in amplifiers   

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30. At low temperature, Lead behaves as a : 

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

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32. 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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33. Atomic hydrogen has a life period of

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34. Resistance of human body in dry condition

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

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36. The device which converts AC to DC is

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37. Who was the first scientist to discover Electrons?

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38. Bandwidth is the

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39. Kirchhoff’s laws are applicable to

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

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41. A multimeter is used to measure

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

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

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

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46. A transformer works on the principle of 

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47. What frequency range is the high frequency band?

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48. Alternating current is converted into direct current by a

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49. The Capacity of a communication channel is measured in 

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50. Circuit breaker usually operate under   

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

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52. A television channel is characterised by

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

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54. A transformer 

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55. Which sources produce alternating current (AC)?

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

 

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

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58. 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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59. A dynamometer wattmeter can be used for

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60. The energy of a photon varies directly with its

 

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

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

 

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63. Which of the following has the lowest frequency? 

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64. Erg cross Sec is the unit of

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65. Which phenomena shows the particle nature of light?   

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66. When an atom loses an electron it becomes

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

 

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

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69. 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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70. The reverse effect of X–ray emission is

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71. In superconductors, the energy gap is due to

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72. Carbon Arc lamps are commonly used in

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73. Electrical Pressure is also called

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

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75. Low voltage cables are meant for use up to   

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

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

 

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

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80. An atom with more neutrons than protons is called

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81. In AC circuits, AC meters measure 

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82. Proton carry a

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83. Modem is used mostly for ?

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84. The audio signals of TV are

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85. Kirchoff’s Voltage Law is known as

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

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87. A wire carrying current is

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

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89. What is a neuron ?

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

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91. The frequency of direct current is ________

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92. Quality of transmission depends upon

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93. The threshold frequency is the frequency below which :

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

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

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96. Which compressor is usually used in AC?

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97. Electrons carry a

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

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

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

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