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

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2. In AC circuits, AC meters measure 

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3. The threshold frequency is the frequency below which :

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4. Alternating current is converted into direct current by a

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5. 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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6. 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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7. The reverse effect of X–ray emission is

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

 

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

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10. Electrons carry a

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11. A multimeter is used to measure

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12. 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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13. Transformer is a device to convert 

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14. Which phenomena shows the particle nature of light?   

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

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17. Negative feedback in amplifiers   

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18. The frequency of direct current is ________

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

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

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21. Which electromagnetic radiation is used for satellite communication ? 

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22. A transformer works on the principle of 

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23. In an optical fibre the signal is transmitted 

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24. Which compressor is usually used in AC?

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25. Modem is used mostly for ?

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26. Electrical Pressure is also called

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27. The energy of a photon varies directly with its

 

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

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

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

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31. Atomic hydrogen has a life period of

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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. Super conductors are substances that 

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34. Which sources produce alternating current (AC)?

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

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

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38. In superconductors, the energy gap is due to

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39. Photon is the fundamental unit/quantum of   

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

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41. When an atom loses an electron it becomes

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

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

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45. A Step-Up transformer increases

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46. The audio signals of TV are

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47. Erg cross Sec is the unit of

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

 

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

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50. What frequency range is the high frequency band?

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51. 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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52. The device which converts AC to DC is

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

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54. Speed regulation of synchronous motor is   

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

 

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

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

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58. The Capacity of a communication channel is measured in 

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59. A dynamometer wattmeter can be used for

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60. Resistance of human body in dry condition

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61. What is a neuron ?

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

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63. Low voltage cables are meant for use up to   

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

 

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

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

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

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

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

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70. Superconductors are those elements

 

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71. Kirchoff’s Voltage Law is known as

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72. Circuit breaker usually operate under   

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

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

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

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

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

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78. 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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79. An atom with more neutrons than protons is called

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

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

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

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83. Carbon Arc lamps are commonly used in

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84. Who was the first scientist to discover Electrons?

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85. Kirchhoff’s laws are applicable to

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86. A transformer 

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87. The wave like properties of electrons are useful in

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88. 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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89. Which of the following supports particle nature of photons ?

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90. A television channel is characterised by

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

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92. Quality of transmission depends upon

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93. At low temperature, Lead behaves as a : 

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94. Which of the following has the lowest frequency? 

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95. Proton carry a

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96. Who discovered X-ray? 

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

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98. A wire carrying current is

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99. Bandwidth is the

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

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