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				This section includes 59 Mcqs, each offering curated multiple-choice questions to sharpen your Telecom knowledge and support exam preparation. Choose a topic below to get started.
| 1. | What is the main function of NSS? | 
| A. | Establishing communication between mobile and landline numbers. | 
| B. | Providing eligible services to the subscriber | 
| C. | Providing parameters for Authentication and Encryption | 
| D. | All | 
| Answer» E. | |
| 2. | What are the functions of a BSC? | 
| A. | Handovers, exchange functions | 
| B. | Frequency hopping | 
| C. | Control of radio frequency power level of BTS | 
| D. | All | 
| Answer» E. | |
| 3. | What is the maximum number of Transceivers a BTS can handle is ? | 
| A. | 8 | 
| B. | 12 | 
| C. | 16 | 
| D. | 22 | 
| Answer» D. 22 | |
| 4. | The only element that personalises a Mobile Station is _______? | 
| A. | Back cover | 
| B. | SIM | 
| C. | Screen guard | 
| D. | None | 
| Answer» C. Screen guard | |
| 5. | What is PUK code of a SIM? | 
| A. | PIN Unlock Key | 
| B. | 4 digit code | 
| C. | It is like a password to enter after inserting SIM in a mobile for the first time. It prevents misuse. | 
| D. | All | 
| Answer» E. | |
| 6. | How many digits of PIN (Personal Identification Number) is allowed to protect a SIM card? | 
| A. | 4 | 
| B. | 8 | 
| C. | 10 | 
| D. | None | 
| Answer» B. 8 | |
| 7. | What controller a group of BTS or Cell Towers? | 
| A. | BSC | 
| B. | MSC | 
| C. | HLR | 
| D. | VLR | 
| Answer» B. MSC | |
| 8. | IMSI number of a SIM is also called? | 
| A. | MSISDN | 
| B. | IMEI | 
| C. | ICCID | 
| D. | None | 
| Answer» D. None | |
| 9. | Your mobile number is actually called ______ number. | 
| A. | IMSI | 
| B. | SIM | 
| C. | MSISDN | 
| D. | None | 
| Answer» D. None | |
| 10. | IMSI stands for? | 
| A. | Internal Mobile Subscriber Identity | 
| B. | International Mobile Subscriber Identity | 
| C. | Investigating Mobile Subscriber Identity | 
| D. | None | 
| Answer» C. Investigating Mobile Subscriber Identity | |
| 11. | Each SIM is identified by a unique _____ number? | 
| A. | IMSI | 
| B. | IMEI | 
| C. | MSDN | 
| D. | None | 
| Answer» B. IMEI | |
| 12. | IMEI stands for? | 
| A. | Internal Mobile Equipment Identity | 
| B. | International Mobile Equipment Identity | 
| C. | Intra Mobile Enable Identity | 
| D. | None | 
| Answer» C. Intra Mobile Enable Identity | |
| 13. | Each Mobile Terminal is identified by a unique ______ number? | 
| A. | IMEI | 
| B. | SIM | 
| C. | IMSI | 
| D. | None | 
| Answer» B. SIM | |
| 14. | A BTS is also called _____ by general public? | 
| A. | Mobile tower | 
| B. | Exchange | 
| C. | Charging Point | 
| D. | None | 
| Answer» B. Exchange | |
| 15. | A GPRS Core network is part of System in a GSM Network Structure? | 
| A. | Mobile Station | 
| B. | BSS | 
| C. | MSS | 
| D. | NSS | 
| Answer» E. | |
| 16. | What are the main parts of an MSC (Mobile Switching Center) system in a GSM structure? | 
| A. | MGW - Media Gateway | 
| B. | MSC Server | 
| C. | Both A and B | 
| D. | None | 
| Answer» D. None | |
| 17. | What are the main parts of a NSS (Network and Switching Subsystem) of a GSM Architecture? | 
| A. | MSC - Mobile Switching Center | 
| B. | HLR & AuC | 
| C. | VLR, EIR | 
| D. | All the above | 
| Answer» E. | |
| 18. | What are the main parts of a BSS (Base Station Subsystem) in a GSM network? | 
| A. | BTS - Base Transceiver Station | 
| B. | BSC - Base Station Controller | 
| C. | A and B | 
| D. | None | 
| Answer» D. None | |
| 19. | What are the main parts of a Mobile Station in a GSM Network? | 
| A. | MT - Mobile Terminal | 
| B. | SIM - Subscriber Identity Module | 
| C. | Both A and B | 
| D. | None | 
| Answer» D. None | |
| 20. | What are the three main parts of a GSM Architecture or Structure? | 
| A. | Mobile Station | 
| B. | BSS - Base Station Subsystem | 
| C. | NSS - Network and Switching Subsystem | 
| D. | All the above | 
| Answer» E. | |
| 21. | Timing Advance (TA) deals with? | 
| A. | The distance between the BTS and Mobile | 
| B. | Time delay of bursts from mobile | 
| C. | Time advance of bursts from mobile | 
| D. | All | 
| Answer» E. | |
| 22. | Which technique of GSM Architecture tells the mobile to advance it's transmission bursts (data) so that overlap with other bursts may be avoided at channel? | 
| A. | DTX | 
| B. | TA - Timing Advance | 
| C. | Power Control | 
| D. | None | 
| Answer» C. Power Control | |
| 23. | What is DTX or Discontinuous Transmission in a GSM network? | 
| A. | DTC stops transmitter when the person is not talking. So less number of voice signals reach BTS with less noise. | 
| B. | With the help of VAD (Voice Activity Detection), mobile identifies conversation and noise to turn off transmission. | 
| C. | On the opposite end, the receiver produces a noise called Comfort Noise. With out this, DTX makes the opposite person think that the line or call is cut. | 
| D. | All | 
| Answer» E. | |
| 24. | Total area served by one network operator is called ______ ? | 
| A. | PSTN | 
| B. | PLMN | 
| C. | LA | 
| D. | CGI | 
| Answer» C. LA | |
| 25. | A single MSC or VLR can have many ______ ? | 
| A. | HLR | 
| B. | Location Areas (LA) | 
| C. | CGI - Cell Global Index | 
| D. | None | 
| Answer» C. CGI - Cell Global Index | |
| 26. | A group of cells in a GSM network has a _________ number. | 
| A. | Location number | 
| B. | Location Area number | 
| C. | Location Area Identity number | 
| D. | None | 
| Answer» D. None | |
| 27. | Each cell in a GSM network has ? | 
| A. | Cell number | 
| B. | Cell Global number | 
| C. | Cell Global Identity number | 
| D. | None | 
| Answer» D. None | |
| 28. | Mobile calls to or from Fixed Networks (Landlines) are handled by ________ ? | 
| A. | MSC | 
| B. | GMSC (Gateway MSC) | 
| C. | HLR | 
| D. | VLR | 
| Answer» C. HLR | |
| 29. | Choose a correct statement about EIR list of IMEIs. | 
| A. | Whitelist - List of allowed IMEIs or Mobile Devices | 
| B. | Grey List - List of IMEIs with limited allowed services | 
| C. | Blacklist - List of forbidden IMEIs or mobiles | 
| D. | All | 
| Answer» E. | |
| 30. | What are the types of lists maintained by EIR (Equipment Identification Register)? | 
| A. | Whitelist | 
| B. | Grey List | 
| C. | Black List | 
| D. | All | 
| Answer» E. | |
| 31. | In a GSM architecture, which system stores the IMEI numbers of all working mobile phones under the network? | 
| A. | HLR | 
| B. | VLR | 
| C. | EIR | 
| D. | AUC | 
| Answer» D. AUC | |
| 32. | In a GSM architecture, which system provides Authentication and Encryption services? | 
| A. | HLR | 
| B. | VLR | 
| C. | EIR | 
| D. | AUC | 
| Answer» E. | |
| 33. | As VLR is fast to access, VLR avoids frequent accessing of ________ ? | 
| A. | EIR | 
| B. | AUC | 
| C. | HLR | 
| D. | None | 
| Answer» D. None | |
| 34. | Usually, VLR is part of _____ ? | 
| A. | HLR | 
| B. | EIR | 
| C. | AUC | 
| D. | MSC | 
| Answer» E. | |
| 35. | Between VLR and HLR, which one is used mostly allow or bar services to the user? | 
| A. | VLR | 
| B. | HLR | 
| C. | Both are used equally | 
| D. | None | 
| Answer» B. HLR | |
| 36. | Usually, VLR contains a copy of data of ______ ? | 
| A. | HLR | 
| B. | EIR | 
| C. | AUC | 
| D. | none | 
| Answer» B. EIR | |
| 37. | Covering area of an MSC is also called ____ ? | 
| A. | VLR | 
| B. | HLR | 
| C. | EIR | 
| D. | AUC | 
| Answer» C. EIR | |
| 38. | What is the name of a database used mainly that stores information of a subscriber along with eligible services under roaming or another MSC area? | 
| A. | HLR | 
| B. | VLR | 
| C. | EIR | 
| D. | AuC | 
| Answer» C. EIR | |
| 39. | What is the name of the database that stores subscriber information under an MSC and his eligible services? | 
| A. | MSC | 
| B. | HLR | 
| C. | EIR | 
| D. | AuC | 
| Answer» C. EIR | |
| 40. | What is the transmission bitrate between BTS and BSC? | 
| A. | 8kbps | 
| B. | 16kbps | 
| C. | 32kbps | 
| D. | 64kbps | 
| Answer» C. 32kbps | |
| 41. | Transmission bitrate between BSC and MSC is ____ ? | 
| A. | 8 kbps | 
| B. | 16kbps | 
| C. | 32kpbs | 
| D. | 64kbps | 
| Answer» E. | |
| 42. | In BSS Type 3, TRAU (Transcoder Unit) or Rate Adapter Unit is present in _____. | 
| A. | BSC | 
| B. | BTS | 
| C. | MSC | 
| D. | None | 
| Answer» C. MSC | |
| 43. | In BSS Types 2, 6 and 7, Speech Transcoding unit is present ______ BSS. | 
| A. | Internally | 
| B. | Externally (Co-located with MSC) | 
| C. | -- | 
| D. | -- | 
| Answer» C. -- | |
| 44. | For BSS Types 1, 4 and 5, Speech Transcoding unit presents ______ BSC. | 
| A. | Inside | 
| B. | Outside | 
| C. | - | 
| D. | - | 
| Answer» B. Outside | |
| 45. | An Authentication Center (AUC) generates ________. | 
| A. | Authentication Keys (Ki) | 
| B. | Cipher Keys (Kc) for encryption and Decryption | 
| C. | Security parameters | 
| D. | All | 
| Answer» E. | |
| 46. | An Equipment Identity Register (EIR) contains _____ lists. | 
| A. | White list or Valid list | 
| B. | Grey or Monitored list | 
| C. | Black or Prohibited list | 
| D. | All | 
| Answer» E. | |
| 47. | A VLR Database contains _____ data. | 
| A. | ISDN number and Subscriber identity | 
| B. | Location information to route calls | 
| C. | Part of HLR data | 
| D. | All | 
| Answer» E. | |
| 48. | A HLR database contains ________ ? | 
| A. | IMSI and ISDN numbers | 
| B. | Location info for call routing | 
| C. | Information about Bearer services and Supplementary services | 
| D. | All | 
| Answer» E. | |
| 49. | The functions of an MSC are ______? | 
| A. | Charging the call or billing | 
| B. | Signalling with outside systems | 
| C. | Logical radio link control | 
| D. | All | 
| Answer» E. | |
| 50. | The functions of a MSC (Mobile Services Switching Center) are _______? | 
| A. | Call handling and paging | 
| B. | Inter BSS and Inter MSC handovers | 
| C. | Acting as a gateway to HLR | 
| D. | All | 
| Answer» E. | |