Information and Communication Technology: UPSC Previous Year Questions (Science and Technology)

Explanation

Software as a Service (SaaS) refers to software provided by a third party as a service where hosting and maintenance are managed by the provider. Unlike traditional methods requiring local deployment and maintenance SaaS allows direct access to software via thin clients such as web browsers.

Statement 1 is correct: SaaS applications often provide customization options, allowing users to adjust the user interface (UI) and modify data fields according to their business requirements. However, customization is typically limited to certain areas defined by the service provider and may not involve deep structural changes.

Statement 2 is correct: SaaS platforms are accessible via the internet and can be used across devices, including desktops, laptops, and mobile devices. This accessibility is a key feature of SaaS, as users can access their applications and data on the go through web browsers or mobile apps.

Statement 3 is correct: Email services such as Outlook, Hotmail, and Yahoo Mail are classic examples of SaaS. They deliver email functionality over the internet without requiring users to install software locally. These services are hosted by the provider and accessed through browsers or apps.

Explanation

Statement 1 is correct: A fundamental principle of Web 3.0 is to grant users ownership and control over their personal data, reducing reliance on centralized entities. This shift aims to enhance privacy and security for individuals.

Statement 2 is correct: Web 3.0 leverages blockchain technology to create decentralized applications, including social networks. These platforms operate without central authorities, offering users greater control over content and data.

Statement 3 is correct: Decentralization is a hallmark of Web 3.0, where control is distributed among users instead of being held by centralized corporations. This collective operation is facilitated through decentralized networks and consensus mechanisms.

Explanation

Quantum computers are machines that use the properties of quantum physics to store data and perform computations. A classical computer performs operations using classical bits, which can be either 0 or 1. Quantum computer uses quantum bits or Qubits, which can be both 0 and 1 at the same time. Qubits (or quantum bits) are the units of computation in quantum computers. They take advantage of quantum mechanics characteristics, which regulate how matter behaves at the atomic level. Quantum computers are faster, more accurate, & energy efficient. Two important phenomena of quantum physics that are used to achieve functioning of quantum computing are:

1. Superimposition: Each quantum bit (basic unit of information in a quantum computer) can represent both a 1 and a 0 at the same time, which is known as superposition.

2. Quantum Entanglement: Subatomic particles become "entangled" (connected) in quantum entanglement, which means that any change in one upsets the other, even though they are at opposite ends of the universe.

Explanation

Short-Range Devices (SRDs) are communication technologies designed for limited-distance operations, typically within a few meters to a few hundred meters.

Option 1 is correct: CCTV systems use video cameras to transmit signals to specific monitors for surveillance purposes. The transmission range of CCTV systems is generally confined to the premises being monitored, making them short-range by design.

Option 2 is correct: RFID employs electromagnetic fields to automatically identify and track tags attached to objects. They are typically short-range, with passive RFID tags readable from up to a few meters and active tags extending up to 100 meters.

Option 3 is correct: WLANs enable wireless network communication within a localized area, such as a home or office, using high-frequency radio waves. The effective range of WLANs is usually within 100 meters, categorizing them as short-range communication technologies.