demo – SARKARI LIBRARY

solve ?

240
128
150
140

if x,y,z are natural numbers, then Find 2x + 3y -z = ?

if a, b,c, are positive integers, then Find 4a+b+3c = ?

if a, b,c,d are integers, then Find a+b+c+d = ?

solve ?

240
128
4/7
140

solve ?

240
128
19/5
140

solve ?

240
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2(41/67)
140

240
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15(81/492)
140

solve ?

240
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40/31
140

solve ?

240
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9/4
140

solve ?

240
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1/3
140

solve ?

240
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3/4
140

solve ?

then Find 2x + 11⁄4

solve ?

240
128
34/21
140

solve ?

240
128
23/14
140

What does LTE stand for in 4G LTE?

Long-Term Evolution
Local Telecommunication Exchange
Low-Tier Energy
Landline Telephone Extension

Explanation:

Long-Term Evolution (LTE) is the correct expansion, representing a standard for wireless broadband communication.
Local Telecommunication Exchange is a fabricated term.
Low-Tier Energy is unrelated to LTE.
Landline Telephone Extension refers to traditional wired telephony.

Which organization developed the LTE standard?

IEEE
3GPP
ITU
ISO

Explanation:

3GPP (3rd Generation Partnership Project) developed LTE as part of global telecommunication standards.
IEEE focuses on general electronics and Wi-Fi standards.
ITU regulates international telecom but did not design LTE.
ISO deals with general standardization, not LTE specifically.

What is the theoretical maximum download speed of 4G LTE?

100 Mbps
1 Gbps
300 Mbps
10 Mbps

Explanation:

1 Gbps is the peak speed under ideal conditions (LTE-Advanced).
100 Mbps is common for standard LTE.
300 Mbps is achievable with carrier aggregation.
10 Mbps is typical for 3G networks.

Which technology does LTE use for data transmission?

TDMA
OFDMA
CDMA
FDMA

Explanation:

OFDMA (Orthogonal Frequency Division Multiple Access) is used in LTE for downlink.
TDMA (Time Division) was used in 2G.
CDMA (Code Division) was used in 3G.
FDMA (Frequency Division) is outdated for mobile broadband.

What is the minimum spectrum bandwidth required for LTE?

1.4 MHz
5 MHz
10 MHz
20 MHz

Explanation:

1.4 MHz is the smallest bandwidth LTE can operate on (though rarely used).
5 MHz is common for basic LTE.
10 MHz and 20 MHz offer higher speeds.

What is the primary advantage of LTE over 3G?

Higher latency
Lower data speeds
Better spectral efficiency
Limited mobility support

Explanation:

Better spectral efficiency allows LTE to deliver higher speeds with less bandwidth.
LTE has lower latency (~20-30 ms) than 3G (~100 ms).
LTE supports speeds up to 1 Gbps, far exceeding 3G.
LTE supports high mobility (e.g., high-speed trains).

Which Indian telecom operator first launched 4G LTE services?

Airtel
Jio
Vodafone Idea
BSNL

Explanation:

Airtel launched India’s first 4G LTE service in Kolkata (2012).
Jio launched later (2016) but popularized LTE with free data.
Vodafone Idea and BSNL adopted LTE later.

What is MIMO in LTE?

Multiple Input Multiple Output
Mobile Internet Management Operation
Multiplexed Interface Modulation Output
Manual Input Manual Output

Explanation:

Multiple Input Multiple Output (MIMO) uses multiple antennas to improve speed and signal quality.

When is World Computer Literacy Day observed?

September 16
December 2
October 24
November 30

Explanation:

December 2 – Established by NIIT in 2001 for its 20th anniversary
Different from Software Freedom Day (September 16)

Which generation of cellular networks first introduced digital voice communication?

Explanation:

2G launched in early 1990s replaced analog 1G systems
Introduced SMS and basic data services (GPRS/EDGE)
Used GSM (Global System for Mobile) or CDMA standards

What is the typical range of Bluetooth technology?

50 meters
10 meters
100 meters
1 kilometer

Explanation:

Class 2 Bluetooth (most common) has 10m range
Operates in 2.4GHz band (2400-2483.5 MHz)
Latest version Bluetooth 5.3 offers improved speed and range

Which wireless technology uses visible light for data transmission?

Wi-Fi
NFC
Li-Fi
RFID

Explanation:

Li-Fi (Light Fidelity) uses LED bulbs for data transfer
Can achieve speeds up to 224 Gbps in lab conditions
More secure than radio-based technologies as light doesn’t penetrate walls

What does MTSO stand for in cellular networks?

Mobile Telephone Service Operator
Mobile Tower Switching Office
Main Telecommunication Switching Office
Multiple Tower Service Operator

Explanation:

MTSO connects all cell towers in an area via fiber optics
Stores SIM card data and manages handoffs between cells
Links cellular network to PSTN (Public Switched Telephone Network)

Which frequency bands does Wi-Fi primarily use?

900 MHz and 1.8 GHz
2.4 GHz and 5 GHz
3.7 GHz and 6 GHz
10 GHz and 12 GHz

Explanation:

2.4GHz (longer range but more crowded)
5GHz (faster speeds, less interference)
Wi-Fi 6E adds 6GHz band for even better performance

What is the maximum speed of 1G networks?

1 Kbps
2.4 Kbps
10 Kbps
64 Kbps

Explanation:

1G (1980s) was analog with very limited capacity
Only supported voice calls with poor quality
Used AMPS (Advanced Mobile Phone System) technology

Which technology is used for contactless payments like Apple Pay?

Bluetooth
Li-Fi
NFC
SATCOM

Explanation:

NFC (Near Field Communication) works within 4cm range
Operates at 13.56 MHz frequency
Used in mobile payments, transit cards, and device pairing

What does RAN stand for in 5G networks?

Radio Access Node
Radio Access Network
Remote Area Network
Random Access Number

Explanation:

RAN connects devices to the core network via radio signals
In 5G includes small cells, macro cells and massive MIMO antennas
Key for achieving 5G’s low latency (1ms target)

Which cellular generation first enabled video calling?

Explanation:

3G (2000s) provided sufficient bandwidth (2Mbps+)
Used UMTS/WCDMA technology
Also enabled mobile TV and proper web browsing

What is the primary purpose of a SIM card?

Device storage
Subscriber identification
Battery management
Display control

Explanation:

SIM (Subscriber Identity Module) authenticates users
Contains IMSI (International Mobile Subscriber Identity)
Modern eSIMs are embedded directly in devices

Which Wi-Fi security protocol is considered most secure today?

WEP
WPA
WPA3
WPS

Explanation:

WPA3 (2018) uses 192-bit encryption (vs WPA2’s 128-bit)
Protects against offline dictionary attacks
Mandatory for Wi-Fi 6 certified devices

What is the main advantage of 5G over 4G?

Larger phone batteries
Lower latency
Better voice quality
Cheaper infrastructure

Explanation:

5G latency as low as 1ms (vs 4G’s 30-50ms)
Enables real-time applications like remote surgery
Also offers higher speeds (up to 20Gbps) and more capacity

What does SSID refer to in Wi-Fi networks?

Security Standard ID
Signal Strength Indicator
Network name
Router model number

Explanation:

SSID (Service Set Identifier) is the visible network name
Maximum 32 characters long
Broadcast can be disabled for “hidden networks”

Which technology has the longest operational range?

NFC
Bluetooth
SATCOM
Li-Fi

Explanation:

SATCOM (Satellite Communications) works globally
Geostationary satellites orbit at 35,786 km altitude
Used in maritime, aviation, and remote area communications

Which wireless technology is used in inventory tracking?

Li-Fi
RFID
NFC
Bluetooth

Explanation:

RFID tags can be passive (no battery) with range up to 10m
Used in supply chain, retail, and access control systems
Operates at various frequencies (LF, HF, UHF)

Which cellular technology introduced OFDMA modulation?

2G
3G
4G LTE
5G

Explanation:

OFDMA (Orthogonal Frequency Division Multiple Access)
Fundamental to LTE’s efficiency and speed
Allows multiple users to share same frequency channel

What is the main difference between Wi-Fi and cellular networks?

Wi-Fi is always faster
Cellular doesn’t need devices
Licensed vs unlicensed spectrum
Wi-Fi can’t transmit data

Explanation:

Cellular uses licensed spectrum (controlled by carriers)
Wi-Fi uses unlicensed spectrum (free but crowded)
Cellular offers mobility, Wi-Fi typically better for stationary use

Which technology enables international mobile usage?

Li-Fi
Roaming agreements
NFC
WPA3

Explanation:

Roaming allows use of partner networks abroad
Enabled by GSMA standards and carrier agreements
May incur additional charges for voice/data usage

What is the key advantage of massive MIMO in 5G?

Smaller phones
Increased capacity
Cheaper plans
Longer battery life

Explanation:

Massive MIMO uses dozens of antennas (64T64R common)
Focuses signals directionally (beamforming)
Can serve many users simultaneously in same frequency

What is the primary use of CDMA in cellular networks?

Battery saving
Multiple access
Display control
Voice encryption

Explanation:

CDMA (Code Division Multiple Access) allows many users to share same frequency
Each call uses unique code
Alternative to GSM’s TDMA approach in 2G/3G

Which technology enables satellite phones?

Li-Fi
NFC
SATCOM
WPA3

Explanation:

SATCOM systems like Iridium, Globalstar provide global coverage
Use LEO (Low Earth Orbit) or GEO (Geostationary) satellites
Essential for maritime, aviation and remote area communications