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.
| 1. |
The magnetic needle always points in _________ direction. |
| A. | East - West |
| B. | West - South |
| C. | North - South |
| D. | North - East |
| Answer» D. North - East | |
| 2. |
Who was the inventor of Radar ? |
| A. | Robert Watson |
| B. | Fleming |
| C. | Bush Wall |
| D. | Austin |
| Answer» B. Fleming | |
| 3. |
CT scan is done by using |
| A. | Infra-red rays |
| B. | Ultrasonic waves |
| C. | Visible lights |
| D. | X- rays |
| Answer» E. | |
| 4. |
Recently developed technique for monitoring fetal growth is |
| A. | Microwave technique |
| B. | Ultrasonic |
| C. | Ultra-violet rays |
| D. | X-rays |
| Answer» C. Ultra-violet rays | |
| 5. |
Light from the sun reaches earth in about |
| A. | 2 minutes |
| B. | 4 minutes |
| C. | 8 minutes |
| D. | 16 minutes |
| Answer» D. 16 minutes | |
| 6. |
Intelsat satellite works as a |
| A. | Transmitter |
| B. | Repeater |
| C. | Absorber |
| D. | None of these |
| Answer» C. Absorber | |
| 7. |
Which of the following device is full duplex ? |
| A. | Mobile phone |
| B. | Walky - talky |
| C. | Loudspeaker |
| D. | Radio |
| Answer» B. Walky - talky | |
| 8. |
An n - type semiconductor is formed |
| A. | When germanium crystal is doped with an impurity containing three valence electron |
| B. | When germanium crystal is doped with an impurity containing five valence electron |
| C. | From pure germanium |
| D. | From pure silicon |
| Answer» C. From pure germanium | |
| 9. |
Which of the following satellites is used in ship - to - shore and shore - to - shore and shore - to - ship communication ? |
| A. | Intelsat |
| B. | Marisat |
| C. | Comsat |
| D. | Telestar |
| Answer» C. Comsat | |
| 10. |
Intelsat satellite is user for |
| A. | Radio communication |
| B. | Intercontinental communication |
| C. | Radar communication |
| D. | None of the above |
| Answer» C. Radar communication | |
| 11. |
The electrical circuits used to get smooth do output from a rectified circuit is called |
| A. | Oscillator |
| B. | Full wave rectifier |
| C. | Amplifier |
| D. | Filter |
| Answer» E. | |
| 12. |
When the temperature of semiconductor is increased, its electrical conductivity |
| A. | Increases |
| B. | Remains the same |
| C. | Devreases |
| D. | None of these |
| Answer» B. Remains the same | |
| 13. |
With the rise of temperature, the specific resistance of semiconductor |
| A. | Increases |
| B. | Remains unchanged |
| C. | Decreases |
| D. | None of these |
| Answer» D. None of these | |
| 14. |
The technique of collecting information about an object from a distance without making physical contact with it is |
| A. | Remote sensing |
| B. | Remote control |
| C. | Remote accessing |
| D. | Space shuttle |
| Answer» B. Remote control | |
| 15. |
The frequency band used for radar relay - systems and television is |
| A. | UHF |
| B. | VLF |
| C. | VHF |
| D. | EHF |
| Answer» B. VLF | |
| 16. |
The absorption of radio waves by the atmosphere depends on |
| A. | Their distance from the transmitter |
| B. | Their polarisation of the wave |
| C. | Their frequency |
| D. | The polarisation of the atmosphere |
| Answer» D. The polarisation of the atmosphere | |
| 17. |
An oscillator is nothing but an amplifier with |
| A. | Positive feedback |
| B. | Large gain |
| C. | No feedback |
| D. | Negative feedback |
| Answer» B. Large gain | |
| 18. |
The space waves which are affected seriously by atmospheric conditions are |
| A. | MF0 |
| B. | HF |
| C. | VHF |
| D. | UHF |
| Answer» E. | |
| 19. |
Which of the following is not transducer ? |
| A. | Loudspeaker |
| B. | Amplifier |
| C. | Microphone |
| D. | All of these |
| Answer» C. Microphone | |
| 20. |
Radio wave of constant amplitude can be generated with |
| A. | Filter |
| B. | Rectifier |
| C. | FET |
| D. | Oscillator |
| Answer» E. | |
| 21. |
The waves relevant to telecommunications are |
| A. | Visible light |
| B. | Infrared |
| C. | Ultraviolet |
| D. | Microwave |
| Answer» E. | |
| 22. |
Modem is a device used for |
| 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 | |
| 23. |
A digital signal possesses |
| A. | Continuously varying values |
| B. | Only two discrete values |
| C. | Only four discrete values |
| D. | None of the above |
| Answer» C. Only four discrete values | |
| 24. |
The electrical conductivity of a pure silicon sample can be increased by |
| A. | Increasing the temperature |
| B. | Doping it with acceptor and donor impurity |
| C. | Shining ultraviolet light on it |
| D. | All of the above |
| Answer» E. | |
| 25. |
Which of the following is not a semiconductor ? |
| A. | Germinium |
| B. | Silicon |
| C. | Arsenic |
| D. | All of these |
| Answer» D. All of these | |
| 26. |
The electrical circuit used to get smooth DC output from a rectifier circuit is called |
| A. | Amplifer |
| B. | Filter |
| C. | Oscillator |
| D. | Full rectifier |
| Answer» C. Oscillator | |
| 27. |
In a transistor the emitter current is |
| 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 | |
| 28. |
In an intrinsic semiconductor |
| 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 | |
| 29. |
If germanium has to be doped with a donor impurity, the foreign atom should be |
| A. | Tetravalent |
| B. | Pentavalent |
| C. | Trivalent |
| D. | None of these |
| Answer» C. Trivalent | |
| 30. |
A hole in p-type semiconductor is |
| A. | An excess electron |
| B. | A missing electron |
| C. | A missing atom |
| D. | A donor level |
| Answer» C. A missing atom | |
| 31. |
A pure semiconductor has |
| A. | An finite resistance at 0 C |
| B. | A finite resistance which does not depend upon temperature |
| C. | A finite resistance which decreases with temperature |
| D. | A finite resistance which increases with temperature |
| Answer» D. A finite resistance which increases with temperature | |
| 32. |
Long distance short - wave radio broad casting uses |
| A. | Ground wave |
| B. | Ionospheric wave |
| C. | Direct wave |
| D. | Sky wave |
| Answer» C. Direct wave | |
| 33. |
The positive charge carriers in semiconductor are |
| A. | Positive ions |
| B. | Protons |
| C. | Positrons |
| D. | Holes |
| Answer» E. | |
| 34. |
Metallic solids are always opaque because |
| 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 | |
| 35. |
A typical Example of a semiconductor is |
| A. | Platinum |
| B. | Germanium |
| C. | Quartz |
| D. | Mica |
| Answer» C. Quartz | |
| 36. |
Antenna is |
| A. | Inductive |
| B. | Capacitive |
| C. | Resistive its resonant frequency |
| D. | Resistive at resonant frequency |
| Answer» B. Capacitive | |
| 37. |
Through which mode of propagation the radio waves can be sent from one place to another ? |
| A. | Ground wave propagation |
| B. | Sky wave propagation |
| C. | Space wave propagation |
| D. | All of the above |
| Answer» E. | |
| 38. |
The resistance of a pn junction in forward bias is |
| A. | Zero |
| B. | Low |
| C. | High |
| D. | Infinite |
| Answer» C. High | |
| 39. |
In black and white televisions, pictures on the screen are produced due to bombardment of |
| A. | X - ray photons on a white screen |
| B. | X - ray photons on a white fluorescent screen |
| C. | Electrons on a white screen |
| D. | Electrons on a fluorescent white screen |
| Answer» E. | |
| 40. |
What does the term Dolby B or Dolby C printed on tape recorders and other sound systems refer to ? |
| A. | Frequency modulated system |
| B. | Amplitude modulated system |
| C. | Nose reduction circuit |
| D. | Both DC and AC power can be used |
| Answer» D. Both DC and AC power can be used | |
| 41. |
In a p-type semiconductor, |
| A. | Holes are the only carriers |
| B. | Electrons are the only carriers |
| C. | Holes are the majority carriers and electrons are the minority carriers |
| D. | None of the above |
| Answer» D. None of the above | |
| 42. |
The unidirectional property of a pn-junction is useful for its use as a |
| A. | Rectifier |
| B. | Oscillator |
| C. | Rectifier |
| D. | Transformer |
| Answer» B. Oscillator | |
| 43. |
When arsenic is added as an impurity to silicon, the resulting material is |
| A. | n-type semiconductor |
| B. | p-type semiconductor |
| C. | n-type conductor |
| D. | None of these |
| Answer» B. p-type semiconductor | |
| 44. |
In the use of transistor as an amplifier |
| 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 | |
| 45. |
The impurity atoms with which pure silicon should be doped to make a p-type semiconductor are those of |
| A. | Phosphorus |
| B. | Boron |
| C. | Aluminium |
| D. | Both (b) and (c) |
| Answer» E. | |
| 46. |
In a p-type semiconductor the majority charge carriers are |
| A. | Electrons |
| B. | Holes |
| C. | Neutrons |
| D. | Protons |
| Answer» C. Neutrons | |
| 47. |
Consider the following statements1. In a semiconductor, the uppermost band is the valence band2. All semiconductors are electrically neutral3. With increase of temperature the resistivity of semiconductor decreases4. Addition of a small amount of impurity of a III or V group elements to a pure semiconductor increases its resistivity Choose the correct statements |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 4 |
| Answer» C. 3 and 4 | |
| 48. |
At zero degree kelvin a piece of germanium |
| A. | Becomes semiconductor |
| B. | Becomes good conductor |
| C. | Becomes bad conductor |
| D. | None of the above |
| Answer» D. None of the above | |
| 49. |
n-type of semiconductor is |
| A. | Negatively charged |
| B. | Positively charged |
| C. | Neutral |
| D. | None of these |
| Answer» D. None of these | |
| 50. |
Match the quantities of Column I with the corresponding quantities in Column II Column - I Column - II F Germanium at 0K1.Intrinsic semiconductorG Germanium at room temperature2.InsulatorH Germanium doped with indium3.n-type semiconductor J Germanium doped 4.p-type semiconductor Codes :F G H J A. 1234B. 2143C. 2134D. 1243 |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» C. C. | |