Nisha is using an Android app to make a voice call over the internet to her friend in another country. Which p

Question

Q. Nisha is using an Android app to make a voice call over the internet to her friend in another country. Which protocol is being used in this case ? (A) Chat (B) VoIP (C) Email (D) TV

CBSECBSE Class XII Board 2026MCQ· 1mImportance★★★★★

🔒 Locked · start free trial →

You're viewing a preview — the full solution, concept, methods & PYQ mapping are locked.

Start your 14-day free trial to unlock the full solution →

Concept understanding — Voice Over IP

Imagine you are holding a telephone handset. Your voice travels as an electrical signal along a copper wire, all the way to the other person. That is the old way — a dedicated physical path for your conversation, held open for the entire call. Now think about how you send a photo to a friend on WhatsApp. You do not need a dedicated wire for that photo. Instead, the photo is chopped into tiny digital packets, each one stamped with your friend's address, and these packets travel through the internet, possibly taking different routes, before being reassembled at the other end.

Voice Over IP (VoIP) does exactly that, but with your voice. Instead of a dedicated telephone line, it uses the same internet connection that carries your emails, web pages, and streaming videos. Your voice is converted into digital data, broken into packets, and sent over the Internet Protocol (IP) network — hence the name.

The precise meaning is this: VoIP is a technology that allows you to make voice calls using a broadband internet connection instead of a regular (analog) phone line. The "IP" part refers to the Internet Protocol, the set of rules that governs how data is sent and received across the internet. So, your voice becomes just another type of data traveling alongside everything else.

Why does this matter? Because it fundamentally changes the economics and flexibility of communication.

Cost: A traditional phone call, especially a long-distance or international one, uses a network that is expensive to build and maintain. VoIP calls, by contrast, travel over the internet you already pay for. This is why services like Skype, WhatsApp calls, and Zoom meetings are either free or very cheap, even across continents.
Integration: Your voice call is no longer a separate service. It can be combined with video, file sharing, and text messaging in a single application. This is why you can be on a video call, share your screen, and type in a chat all at once — it is all just data.
Flexibility: You are not tied to a physical phone jack. You can take your VoIP number anywhere you have an internet connection — a hotel in another country, a coffee shop, or your mobile phone's data plan. Your "phone" is now a software application. …

Start your 14-day free trial to unlock the full solution →

The protocol used for making voice calls over the internet is VoIP (Voice over Internet Protocol), which converts voice into digital data packets and transmits them over the internet.

When Nisha uses an Android app to call her friend abroad, she is not using a traditional telephone network. Instead, her voice is being converted into digital data and sent over the internet. This is the core idea behind Voice over Internet Protocol, or VoIP.

VoIP is not a single protocol but a family of technologies that enable voice communication over IP networks like the internet. Instead of using the dedicated circuit-switched lines of a telephone company, VoIP breaks your voice into small data packets, sends them across the internet, and reassembles them at the other end. Apps like WhatsApp, Skype, Google Meet, and Zoom all rely on VoIP to make voice and video calls possible.

Note

The NCERT textbook for Class 12 Computer Science (Chapter 10, Communication and Network Concepts) explicitly lists VoIP as a key application of the internet. It describes VoIP as a technology that allows users to make telephone calls over the internet, often at much lower cost than traditional international calls.

The other options in the question are not correct for this scenario. Chat refers to real-time text messaging, not voice. Email is for sending messages and files asynchronously, not for live conversation. TV is a broadcast medium, not a two-way communication protocol. …

Start your 14-day free trial to unlock the full solution →

Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2026Set 90/1/11 markMCQ
$Q. Nisha is using an Android app to make a voice call over the internet to her friend in another country. Which protocol is being used in this case ? (A) Chat (B) VoIP (C) Email (D) TV$
›Reveal solutionSolution

The protocol used for making voice calls over the internet is VoIP (Voice over Internet Protocol), which converts voice into digital data packets and transmits them over the internet.

When Nisha uses an Android app to call her friend abroad, she is not using a traditional telephone network. Instead, her voice is being converted into digital data and sent over the internet. This is the core idea behind Voice over Internet Protocol, or VoIP.

VoIP is not a single protocol but a family of technologies that enable voice communication over IP networks like the internet. Instead of using the dedicated circuit-switched lines of a telephone company, VoIP breaks your voice into small data packets, sends them across the internet, and reassembles them at the other end. Apps like WhatsApp, Skype, Google Meet, and Zoom all rely on VoIP to make voice and video calls possible.

Note

The NCERT textbook for Class 12 Computer Science (Chapter 10, Communication and Network Concepts) explicitly lists VoIP as a key application of the internet. It describes VoIP as a technology that allows users to make telephone calls over the internet, often at much lower cost than traditional international calls.

The other options in the question are not correct for this scenario. Chat refers to real-time text messaging, not voice. Email is for sending messages and files asynchronously, not for live conversation. TV is a broadcast medium, not a two-way communication protocol. …
Start your 14-day free trial to see the full solution →
CBSE 2025Set 90/1/11 markMCQ
$Q. Which protocol is used while communicating through video calls on the Internet? (A) Video Over Internet Protocol (B) Voice Over Internet Protocol (C) Internet Protocol (D) Video Audio Over Internet Protocol$
›Reveal solutionSolution

Video calls on the Internet primarily use the Voice Over Internet Protocol (VoIP) framework, which has evolved to handle both audio and video streams in real-time.

When we talk about communicating through video calls on the Internet, we're referring to a process that allows real-time transmission of both audio and visual information across vast distances using the global network. The underlying technology that makes this possible is built upon principles established for voice communication over the Internet.

At its core, the Internet operates by breaking down all information into small packets of data, which are then sent independently and reassembled at the destination. For real-time communication like calls, whether voice or video, this process needs to be incredibly efficient and fast to avoid noticeable delays.

The foundational protocol suite for real-time communication over the Internet is Voice Over Internet Protocol (VoIP). Initially, as the name suggests, VoIP was developed to transmit only voice (audio) signals digitally over the Internet, rather than through traditional telephone lines. It converts analog voice signals into digital packets, sends them over the Internet, and then converts them back into analog signals at the receiving end. This innovation dramatically reduced the cost of long-distance calls and opened up new possibilities for communication.

Note

Think of VoIP as the blueprint for sending real-time media over the Internet. While its name emphasizes "Voice," the architectural principles it established are robust enough to be extended to other forms of media.

As technology advanced and Internet bandwidth improved, the capabilities of VoIP systems expanded. It became natural to integrate video streams into this existing framework. Instead of just digitizing and transmitting audio, the system was enhanced to also digitize and transmit video frames as part of the same real-time communication session. The same principles of packetization, routing over IP networks, and ensuring timely delivery apply to both audio and video components of a call. …
Start your 14-day free trial to see the full solution →

Q.Nisha is using an Android app to make a voice call over the internet to her friend in another country. Which protocol is being used in this case ? (A) Chat (B) VoIP (C) Email (D) TV

🎓Unlock everything free for 14 days

Unlock everything free for 14 days