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What does 'SIM' stand for in mobile phones?
- Single Identity Module
- Subscriber Identity Module
- Secure Information Memory
- System Integration Module
Answer: Subscriber Identity Module
SIM (Subscriber Identity Module) is a small chip that stores subscriber information, network authentication keys, contacts, and SMS. It identifies and authenticates users on cellular networks. eSIM is an embedded digital SIM that can be programmed remotely without physical card replacement.
Virtual memory allows a computer to use hard disk space as an extension of RAM.
- True
- False
Answer: True
Virtual memory is a memory management technique where the OS uses a portion of hard disk (page file/swap space) as an extension of physical RAM. Allows running programs larger than available RAM by swapping inactive pages to disk. Slower than physical RAM but enables multitasking and larger address spaces.
Which of the following is a social engineering attack?
- Buffer Overflow
- Phishing
- SQL Injection
- DDoS
Answer: Phishing
Phishing is a social engineering attack where attackers impersonate legitimate entities via email/SMS to trick victims into revealing credentials or installing malware. Unlike technical exploits (buffer overflow, SQL injection), social engineering manipulates human psychology. Training and awareness are key defenses.
The system that enables cash withdrawals and balance inquiries at micro-ATMs using Aadhaar authentication is called ________.
Answer: AePS
AePS (Aadhaar Enabled Payment System) allows bank customers to use Aadhaar number and fingerprint/iris for basic banking transactions at Micro-ATMs through Business Correspondents. Operated by NPCI, it promotes financial inclusion in rural areas without need for cards, phones, or internet.
Which protocol is used for secure remote login to network devices?
- Telnet
- FTP
- SSH
- HTTP
Answer: SSH
SSH (Secure Shell) provides encrypted remote login and command execution over insecure networks. Replaces insecure Telnet which transmits data in plaintext. SSH uses public-key cryptography for authentication and supports port forwarding, file transfer (SFTP), and tunneling. Default port: 22.
Quantum computers can break all existing encryption algorithms instantly.
- True
- False
Answer: False
Quantum computers threaten asymmetric algorithms like RSA and ECC using Shor's algorithm, but not all encryption. Symmetric algorithms (AES) require larger key sizes for quantum resistance. Post-Quantum Cryptography (PQC) is being standardized by NIST. Practical large-scale quantum computers capable of breaking encryption are still years away.
Which satellite navigation system is developed by India as an alternative to GPS?
- GLONASS
- Galileo
- NavIC
- BeiDou
Answer: NavIC
NavIC (Navigation with Indian Constellation) is India's independent regional satellite navigation system with 7 satellites. Provides positioning accuracy better than 20m over India and 1500 km surrounding area. Used in transportation, disaster management, and mobile devices. GLONASS (Russia), Galileo (EU), BeiDou (China) are other global systems.
The permanent memory in a computer that retains data even when power is off is called ________.
Answer: ROM
ROM (Read-Only Memory) is non-volatile memory that stores firmware like BIOS/UEFI. Data is written during manufacturing and generally cannot be modified by users. Unlike RAM which is volatile, ROM retains critical boot instructions even after power loss. Variants include PROM, EPROM, EEPROM.
Which initiative provides digital literacy training to rural citizens under Digital India?
- PMGDISHA
- SWAYAM
- DIKSHA
- e-Pathshala
Answer: PMGDISHA
PMGDISHA (Pradhan Mantri Gramin Digital Saksharta Abhiyan) aims to make 6 crore rural adults digitally literate by training them to operate computers, access internet, use digital payments, and avail e-governance services. Implemented through Common Service Centres (CSCs) across villages.
Two-factor authentication (2FA) completely eliminates the risk of account compromise.
- True
- False
Answer: False
2FA significantly reduces risk but doesn't eliminate it. Attackers can bypass 2FA via SIM swapping, phishing for OTPs, malware capturing tokens, or social engineering. Best practice: use authenticator apps or hardware tokens instead of SMS, monitor account activity, and use unique passwords.
Which blockchain application enables decentralized finance (DeFi) services like lending and trading without intermediaries?
- NFT Marketplaces
- Smart Contracts
- Digital Identity
- Supply Chain
Answer: Smart Contracts
DeFi protocols use smart contracts to automate financial services: lending (Aave), trading (Uniswap), derivatives, and yield farming. Operate on public blockchains (Ethereum, Solana) with transparent, permissionless access. Risks include smart contract bugs, volatility, and regulatory uncertainty. Critical for fintech innovation questions.
4D printing adds the dimension of time, enabling 3D printed objects to change shape or properties in response to stimuli.
- True
- False
Answer: True
4D printing uses smart materials (shape-memory polymers, hydrogels) that transform when exposed to heat, moisture, light, or magnetic fields. Applications: self-assembling structures, adaptive medical devices, and responsive textiles. Emerging research area with potential in aerospace, healthcare, and soft robotics.
Which sensor technology is essential for autonomous vehicles to detect objects and measure distances?
- GPS
- LIDAR
- Microphone
- Temperature Sensor
Answer: LIDAR
LIDAR (Light Detection and Ranging) uses laser pulses to create high-resolution 3D maps of surroundings, enabling object detection, classification, and distance measurement. Combined with cameras, radar, and GPS for robust perception. Critical for self-driving cars, drones, and mobile robots. Important for autonomous systems questions.
The measure of how long a qubit maintains its quantum state before decoherence is called ________ Time.
Answer: Coherence
Coherence time (T1 for energy relaxation, T2 for phase decoherence) determines how many quantum operations can be performed before errors dominate. Longer coherence enables more complex algorithms. Improved via better materials, shielding, and error correction. Critical metric for comparing quantum hardware platforms.
Which economic model in the metaverse allows creators to earn royalties on secondary sales of digital assets?
- Subscription
- Freemium
- NFT Royalties
- Advertising
Answer: NFT Royalties
NFT smart contracts can embed royalty clauses (e.g., 5-10%) that automatically pay creators on each resale in secondary markets. Enables sustainable creator economies in metaverse platforms. Implemented on Ethereum, Polygon, and other chains. Critical for digital ownership and creator monetization questions.
Zero-knowledge proofs allow verification of a statement without revealing the underlying data.
- True
- False
Answer: True
ZK-proofs enable one party to prove knowledge of a secret (e.g., valid transaction) without revealing the secret itself. Applications: privacy-preserving cryptocurrencies (Zcash), identity verification, and confidential smart contracts. Computationally intensive but advancing with zk-SNARKs/zk-STARKs. Critical for privacy and scalability questions.
Which post-processing step is commonly required for metal 3D printed parts to relieve internal stresses?
- Painting
- Heat Treatment
- Polishing
- Coating
Answer: Heat Treatment
Heat treatment (annealing, stress relieving) reduces residual stresses from rapid melting/solidification in metal AM, improving dimensional stability and mechanical properties. Other post-processing: support removal, machining, surface finishing. Critical for qualifying AM parts for aerospace/medical applications. Important for manufacturing process questions.
The feedback control system that uses sensor data to correct robot motion errors is called ________ Control.
Answer: Closed-loop / Feedback
Closed-loop control continuously compares desired vs actual state (via sensors) and adjusts actuators to minimize error. Contrasts with open-loop (no feedback). Essential for precision tasks: assembly, welding, autonomous navigation. PID controllers are common implementation. Critical for robotics control theory questions.
Which quantum algorithm provides quadratic speedup for searching unstructured databases?
- Shor's Algorithm
- Grover's Algorithm
- Quantum Fourier Transform
- Variational Quantum Eigensolver
Answer: Grover's Algorithm
Grover's Algorithm searches an unsorted database of N items in O(√N) queries vs O(N) classically. Applications: optimization, cryptography, and machine learning. Less dramatic than Shor's exponential speedup but broadly applicable. Requires coherent quantum operations; noise limits practical advantage on NISQ devices.
The metaverse concept includes persistent virtual worlds that continue to exist even when users log off.
- True
- False
Answer: True
Persistence is a defining feature of metaverse: virtual environments, economies, and social interactions continue evolving independently of individual user presence. Enabled by cloud infrastructure, blockchain state, and server-side simulation. Critical for distinguishing metaverse from ephemeral VR experiences or video games.