BSNL SET 2026 Telecom - Practice Set 1

Question 1

What does FTTH stand for?

A. Fiber To The Hub

B. Fiber To The Home

C. Fast Transmission To Home

D. Fiber Transmission Terminal Hub

Question 2

Which medium is used in FTTH?

A. Coaxial cable

B. Twisted pair

C. Optical fiber

D. Radio waves

Question 3

ADSL primarily uses which type of cable?

A. Optical fiber

B. Coaxial cable

C. Twisted pair copper

D. Waveguide

Question 4

Why does ADSL use two copper wires?

A. For redundancy

B. For power supply

C. To form a balanced transmission line

D. For grounding

Question 5

In ADSL, upload and download speeds are:

A. Equal

B. Upload higher than download

C. Download higher than upload

D. Random

Question 6

What does OFDM stand for?

A. Optical Frequency Division Multiplexing

B. Orthogonal Frequency Division Multiplexing

C. Open Frequency Digital Modulation

D. Orthogonal Fiber Data Multiplexing

Question 7

In OFDM, 'orthogonal' means:

A. Signals are at the same frequency

B. Signals do not interfere with each other

C. Signals are phase shifted

D. Signals are encrypted

Question 8

What is the purpose of cyclic prefix in OFDM?

A. Increase data rate

B. Reduce noise

C. Prevent inter-symbol interference

D. Encrypt data

Question 9

Which device in GSM handles radio communication with mobile stations?

A. BSC

B. MSC

C. BTS

D. HLR

Question 10

BSC stands for:

A. Base Switching Center

B. Base Station Controller

C. Broadcast System Controller

D. Basic Switching Controller

Question 11

HLR in GSM network stores:

A. Temporary subscriber data

B. Billing information only

C. Permanent subscriber information

D. Only call logs

Question 12

VLR stands for:

A. Visitor Location Register

B. Virtual Location Router

C. Voice Link Register

D. Verified Line Register

Question 13

Which network element connects multiple BTS?

A. MSC

B. BSC

C. HLR

D. VLR

Question 14

Which modulation technique is used in LTE and Wi-Fi?

A. QPSK

B. FSK

C. OFDM

D. AM

Question 15

What is the main advantage of optical fiber?

A. Low cost

B. High bandwidth and low loss

C. Easy splicing

D. High power handling

Question 16

Which device converts optical signals to electrical signals in FTTH?

A. OLT

B. ONU/ONT

C. Splitter

D. Router

Question 17

In FTTH, OLT is located at:

A. Customer premises

B. Telephone exchange

C. Street cabinet

D. Mobile tower

Question 18

What does BTS stand for?

A. Base Transmission Station

B. Base Transceiver Station

C. Broadband Transmission System

D. Basic Telecom System

Question 19

Which component splits optical signal to multiple users in FTTH?