MCQOPTIONS
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MCQOPTIONS
This section includes 95 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Modern communication systems use |
| A. | Analog circuits |
| B. | Digital circuits |
| C. | Combination of analog and digital circuits |
| D. | None of the above |
| Answer» C. Combination of analog and digital circuits | |
| 52. |
A diode can be used for |
| A. | Amplification |
| B. | Modulation |
| C. | Detection |
| D. | Rectification |
| Answer» E. | |
| 53. |
A diode as a rectifier converts |
| A. | AC to DC |
| B. | DC to AC |
| C. | Varying DC into constant dc |
| D. | High voltage into low voltage and vice-versa |
| Answer» B. DC to AC | |
| 54. |
Which of the following shows particle nature of hight ? |
| A. | Polarization |
| B. | Photoelectric effect |
| C. | Refraction |
| D. | Interference |
| Answer» C. Refraction | |
| 55. |
In a transistor |
| A. | Both the emitter and the collector are equally doped |
| B. | Emitter is more heavily doped than the collector |
| C. | The base is made very thin and is lightly doped |
| D. | Both (b) and (c) |
| Answer» E. | |
| 56. |
A digital signal |
| A. | Is less reliable than analog signal |
| B. | Is more reliable than analog signal |
| C. | Is equally reliable as the analog signal |
| D. | None of the above |
| Answer» C. Is equally reliable as the analog signal | |
| 57. |
A transistor is made of |
| A. | Intrinsic semiconductors |
| B. | Doped semiconductors |
| C. | A metal piece sandwiched between two intrinsic semiconductors |
| D. | None of the above |
| Answer» C. A metal piece sandwiched between two intrinsic semiconductors | |
| 58. |
In a transistor, the base is |
| A. | An insulator |
| B. | A conductor of low resistance |
| C. | A conductor of high resistance |
| D. | An extrinsic semiconductor |
| Answer» E. | |
| 59. |
A zener diode is also a p - n junction diode. It can be used as / an |
| A. | Full - wave rectifier |
| B. | AC voltage regulator |
| C. | DC voltage regulator |
| D. | Half - wave rectifier |
| Answer» D. Half - wave rectifier | |
| 60. |
The expected energy of the electron at absolute zero is called |
| A. | Fermi energy |
| B. | Emission energy |
| C. | Work function |
| D. | Potential energy |
| Answer» B. Emission energy | |
| 61. |
The audio signal |
| A. | Can be sent directly over the air for distance |
| B. | Can not be sent directly over the air for large distance |
| C. | Posses very high frequency |
| D. | None of the above |
| Answer» C. Posses very high frequency | |
| 62. |
The sky wave propagation is suitable for radio waves of frequency. |
| A. | Up to 2 MHz |
| B. | From 2 MHz to 20 MHz |
| C. | From 2 MHz to 30 MHz |
| D. | From 2 MHz to 80 MHz |
| Answer» D. From 2 MHz to 80 MHz | |
| 63. |
Resistivity of semiconductor depends on |
| A. | Shape of semiconductor |
| B. | Length of semiconductor |
| C. | Atomic nature of semiconductor |
| D. | Shape and atomic nature of semiconductor |
| Answer» D. Shape and atomic nature of semiconductor | |
| 64. |
For television broadcasting the frequency employed is normally |
| A. | 30 - 300 MHz |
| B. | 30 - 300 GHz |
| C. | 30 - 300 kHz |
| D. | 30 - 300 Hz |
| Answer» B. 30 - 300 GHz | |
| 65. |
Optical fiber communication is generally preferred over general communication system because |
| A. | It is more efficient |
| B. | Of signal security |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» D. None of the above | |
| 66. |
What is the difference between Bluetooth and WI-Fi devices ? |
| A. | Bluetooth used 2.4 GHz radio frequency band whereas Wi-Fi can use 2.4 CHz or 5 GHz frequency band |
| B. | Bluetooth is used for wireless local area networks (WLAN) only whereas Wi-Fi is used for wireless wide area networks (WWAN) only |
| C. | When information is transmitted between two devices using bluetooth technology, the devices have to be in the line of sight of each other, but when Wi-Fi technology is used the devices need not be in the line of sight of each other |
| D. | The statements (a) and (b) given above are correct in this context |
| Answer» B. Bluetooth is used for wireless local area networks (WLAN) only whereas Wi-Fi is used for wireless wide area networks (WWAN) only | |
| 67. |
Through which mode of |
| A. | Ground wave propagation |
| B. | Sky wave propagation |
| C. | Space wave propagation |
| D. | All of the above |
| Answer» E. | |
| 68. |
A hole in |
| A. | An excess electron |
| B. | A missing electron |
| C. | A missing atom |
| D. | A donor level |
| Answer» C. A missing atom | |
| 69. |
A typical Example of a |
| A. | Platinum |
| B. | Germanium |
| C. | Quartz |
| D. | Mica |
| Answer» C. Quartz | |
| 70. |
Antenna |
| A. | Inductive |
| B. | Capacitive |
| C. | Resistive its resonant frequency |
| D. | Resistive at resonant frequency |
| Answer» B. Capacitive | |
| 71. |
Long distance |
| A. | Ground wave |
| B. | Ionospheric wave |
| C. | Direct wave |
| D. | Sky wave |
| Answer» C. Direct wave | |
| 72. |
Metallic solids |
| A. | They reflect all the incident light |
| B. | They scatter all the incident light |
| C. | The incident light is readily absorbed by free electrons in a metal |
| D. | The energy band traps the incident light |
| Answer» D. The energy band traps the incident light | |
| 73. |
In a transistor the |
| A. | Slightly more than the collector current |
| B. | Slightly less than the collector current |
| C. | Equal to the collector current |
| D. | Equal to the base current |
| Answer» B. Slightly less than the collector current | |
| 74. |
In an |
| A. | Only electrons are responsible for the blow of current |
| B. | Only holes are responsible for the blow of current |
| C. | Both holes and electrons carry current and their number is the same |
| D. | None of the above |
| Answer» D. None of the above | |
| 75. |
Radio wave |
| A. | Filter |
| B. | Rectifier |
| C. | FET |
| D. | Oscillator |
| Answer» E. | |
| 76. |
With the |
| A. | Increases |
| B. | Remains unchanged |
| C. | Decreases |
| D. | None of these |
| Answer» D. None of these | |
| 77. |
The frequency band used for |
| A. | UHF |
| B. | VLF |
| C. | VHF |
| D. | EHF |
| Answer» B. VLF | |
| 78. |
Which of the following device is full |
| A. | Mobile phone |
| B. | Walky - talky |
| C. | Loudspeaker |
| D. | Radio |
| Answer» B. Walky - talky | |
| 79. |
Intelsat satellite |
| A. | Radio communication |
| B. | Intercontinental communication |
| C. | Radar communication |
| D. | None of the above |
| Answer» C. Radar communication | |
| 80. |
Modem |
| A. | Modulating signals |
| B. | Converting anaglog signals to digital signals |
| C. | Either of the above |
| D. | None of the above |
| Answer» C. Either of the above | |
| 81. |
The waves relevant to |
| A. | Visible light |
| B. | Infrared |
| C. | Ultraviolet |
| D. | Microwave |
| Answer» E. | |
| 82. |
CT scan |
| A. | Infra-red rays |
| B. | Ultrasonic waves |
| C. | Visible lights |
| D. | X- rays |
| Answer» E. | |
| 83. |
Light from the |
| A. | 2 minutes |
| B. | 4 minutes |
| C. | 8 minutes |
| D. | 16 minutes |
| Answer» D. 16 minutes | |
| 84. |
Recently developed technique for |
| A. | Microwave technique |
| B. | Ultrasonic |
| C. | Ultra-violet rays |
| D. | X-rays |
| Answer» C. Ultra-violet rays | |
| 85. |
In the use of |
| A. | The emitter - base junction is forward biased and the collector - base junction is reverse biased |
| B. | Both the junctions are forward biased |
| C. | Any of the two junctions may be forward biased |
| D. | None of the above |
| Answer» B. Both the junctions are forward biased | |
| 86. |
The impurity atoms with which pure silicon should be doped to make a |
| A. | Phosphorus |
| B. | Boron |
| C. | Aluminium |
| D. | Both (b) and (c) |
| Answer» E. | |
| 87. |
Optical fiber communication |
| A. | It is more efficient |
| B. | Of signal security |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» D. None of the above | |
| 88. |
What is the difference between |
| A. | Bluetooth used 2.4 GHz radio frequency band whereas Wi-Fi can use 2.4 CHz or 5 GHz frequency band |
| B. | Bluetooth is used for wireless local area networks (WLAN) only whereas Wi-Fi is used for wireless wide area networks (WWAN) only |
| C. | When information is transmitted between two devices using bluetooth technology, the devices have to be in the line of sight of each other, but when Wi-Fi technology is used the devices need not be in the line of sight of each other |
| D. | The statements (a) and (b) given above are correct in this context |
| Answer» B. Bluetooth is used for wireless local area networks (WLAN) only whereas Wi-Fi is used for wireless wide area networks (WWAN) only | |
| 89. |
Match the quantities of |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» C. C. | |
| 90. |
Which of the following shows |
| A. | Polarization |
| B. | Photoelectric effect |
| C. | Refraction |
| D. | Interference |
| Answer» C. Refraction | |
| 91. |
Resistivity |
| A. | Shape of semiconductor |
| B. | Length of semiconductor |
| C. | Atomic nature of semiconductor |
| D. | Shape and atomic nature of semiconductor |
| Answer» D. Shape and atomic nature of semiconductor | |
| 92. |
The expected energy of the |
| A. | Fermi energy |
| B. | Emission energy |
| C. | Work function |
| D. | Potential energy |
| Answer» B. Emission energy | |
| 93. |
Modern communication systems |
| A. | Analog circuits |
| B. | Digital circuits |
| C. | Combination of analog and digital circuits |
| D. | None of the above |
| Answer» C. Combination of analog and digital circuits | |
| 94. |
Consider the following statements |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 4 |
| Answer» C. 3 and 4 | |
| 95. |
n-type |
| A. | Negatively charged |
| B. | Positively charged |
| C. | Neutral |
| D. | None of these |
| Answer» D. None of these | |