mobile technology

science

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  • FDMA (Frequency Division) is outdated for mobile broadband.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?

  • 1G
  • 2G
  • 3G
  • 4G

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?

  • 2G
  • 3G
  • 4G
  • 5G

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
mobile technology