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Which key uniquely identifies each record in a database table?
- Foreign Key
- Candidate Key
- Primary Key
- Composite Key
Answer: Primary Key
Primary Key is a column or set of columns that uniquely identifies each row in a table. It cannot contain NULL values and must be unique. Foreign keys establish relationships between tables, while candidate keys are potential primary keys.
The technology that overlays digital information onto the real world through smartphone cameras is called ________ Reality.
Answer: Augmented
Augmented Reality (AR) superimposes computer-generated images, sounds, or data onto the real-world environment. Unlike VR which creates fully immersive digital environments, AR enhances reality. Applications include gaming, education, retail, and navigation.
SSD (Solid State Drive) has moving mechanical parts like traditional hard disks.
- True
- False
Answer: False
SSDs use flash memory chips with no moving parts, making them faster, more durable, and quieter than HDDs (Hard Disk Drives) which use spinning platters and mechanical read/write heads. SSDs are now standard in most modern computers.
The platform that enables cashless transactions using virtual payment addresses in India is called ________.
Answer: UPI
UPI (Unified Payments Interface) enables instant bank-to-bank transactions using virtual payment addresses (e.g., name@bank). Developed by NPCI, it supports peer-to-peer and merchant payments, bill payments, and integrates with multiple banking apps.
Chandrayaan-2 successfully landed on the Moon's surface in 2019.
- True
- False
Answer: False
Chandrayaan-2's lander Vikram lost communication during final descent and crash-landed on the Moon in September 2019. However, the orbiter component was successfully placed in lunar orbit and continues to provide valuable scientific data.
A network security system that monitors and controls incoming/outgoing traffic based on predetermined rules is called ________.
Answer: Firewall
Firewall is a network security device/software that monitors and filters traffic between trusted internal networks and untrusted external networks based on security rules. It can be hardware-based, software-based, or cloud-based.
Which memory type is fastest in a computer system?
- RAM
- Cache
- Hard Disk
- Register
Answer: Register
Registers are the fastest memory type, located inside the CPU, used for immediate data processing. Cache is next fastest (L1/L2/L3), followed by RAM, then storage devices (SSD/HDD). Speed hierarchy: Registers > Cache > RAM > SSD > HDD.
Which technology enables physical objects to connect and exchange data over the internet?
- AI
- IoT
- VR
- AR
Answer: IoT
IoT (Internet of Things) refers to network of physical devices embedded with sensors, software, and connectivity to collect and exchange data. Applications include smart homes, industrial automation, healthcare monitoring, and smart cities.
The unique address assigned to each device on a network for identification is called ________ Address.
Answer: IP
IP (Internet Protocol) Address is a numerical label assigned to each device connected to a network. IPv4 uses 32-bit addresses (e.g., 192.168.1.1), while IPv6 uses 128-bit addresses to accommodate the growing number of internet-connected devices.
Which data structure follows Last-In-First-Out (LIFO) principle?
- Queue
- Array
- Stack
- Linked List
Answer: Stack
Stack is a linear data structure that follows LIFO principle - the last element added is the first to be removed. Operations include push (add) and pop (remove). Used in function call management, expression evaluation, and undo mechanisms.
Using the same password for multiple accounts is a recommended security practice.
- True
- False
Answer: False
Using the same password across multiple accounts is highly risky. If one account is breached, attackers can access all accounts with the same credentials. Best practice: use unique, strong passwords for each account and enable two-factor authentication.
The Indian regional navigation satellite system is called ________.
Answer: NavIC
NavIC (Navigation with Indian Constellation), formerly IRNSS, is India's independent regional satellite navigation system providing accurate position information over India and 1500 km around. It consists of 7 satellites and is an alternative to GPS.
Which generation of mobile technology first introduced packet-switched data transmission?
- 1G
- 2G
- 3G
- 4G
Answer: 2G
2G (specifically GPRS/EDGE enhancements) introduced packet-switched data transmission, enabling always-on internet access and efficient data usage. 1G was analog voice only; 3G improved data speeds; 4G introduced all-IP architecture with higher bandwidth.
What does 'HTTPS' in a website URL indicate?
- High-speed Transfer Protocol
- Hyper Text Transfer Protocol Secure
- Hosted Transfer Protocol System
- Hardware Tested Protocol Standard
Answer: Hyper Text Transfer Protocol Secure
HTTPS indicates that communication between browser and website is encrypted using SSL/TLS protocols. This protects data from eavesdropping and tampering. Users should look for the padlock icon and 'https://' when entering sensitive information online.
The digital platform that allows citizens to store driving license, vehicle registration, and other documents electronically is called ________.
Answer: DigiLocker
DigiLocker is a cloud-based platform under Digital India that enables citizens to store, share, and verify important documents digitally. Documents issued by registered authorities through DigiLocker have legal validity under the Information Technology Act, 2000.
Wi-Fi and Internet are the same thing.
- True
- False
Answer: False
Wi-Fi is a wireless technology that allows devices to connect to a local network without cables. Internet is the global network of networks. Wi-Fi provides local wireless access; you still need an ISP connection to access the internet via Wi-Fi.
In cloud computing, 'SaaS' stands for Storage as a Service.
- True
- False
Answer: False
SaaS stands for Software as a Service, where applications are hosted by a provider and made available to customers over the internet (e.g., Google Workspace, Microsoft 365). Storage as a Service is a different cloud model, while IaaS and PaaS are other main categories.
Which ISRO mission was India's first interplanetary mission to Mars?
- Chandrayaan-1
- Mangalyaan
- Aditya-L1
- GSAT-6A
Answer: Mangalyaan
Mangalyaan (Mars Orbiter Mission), launched in 2013, made India the first Asian nation and fourth space agency globally to reach Mars orbit. It was completed at a cost of just $74 million, making it one of the least expensive Mars missions.
A type of malware that encrypts victim's files and demands payment for decryption key is called ________.
Answer: Ransomware
Ransomware is malicious software that encrypts files on victim's device and demands ransom (usually in cryptocurrency) for the decryption key. Prevention includes regular backups, updated antivirus, and avoiding suspicious email attachments.
5G technology operates only on high-frequency mmWave spectrum above 24 GHz.
- True
- False
Answer: False
5G operates across three spectrum bands: low-band (<1 GHz) for wide coverage, mid-band (1-6 GHz) for balanced speed/coverage, and high-band/mmWave (24-100 GHz) for ultra-high speeds in dense areas. India primarily uses mid-band for 5G rollout.