Class 10 · Science & Technology
Unit 13 – ICT Exercise (Solved)
Information and Communication Technology
A. Multiple Choice Questions
1
Digital communication uses which type of signal?
iii. Binary signal (0s and 1s)
2
Which is an example of digital communication?
iii. Mobile phone communication
3
Which device converts analog signal into digital signal?
i. Modem
4
Baseband transmission means:
ii. Transmitting one signal without modulation
5
Which uses baseband communication?
iii. Local Area Network (LAN)
6
Broadband communication allows:
iii. Multiple signals at different frequencies
7
Which is an example of broadband communication?
ii. Coaxial cable used for TV cable service
8
The technique used in broadband communication is:
ii. Frequency Division Multiplexing (FDM)
9
Digital well-being mainly refers to:
ii. Safe, balanced, and responsible use of technology
10
Which is a good practice for digital well-being?
iii. Taking regular screen breaks
11
The term "screen time" means:
ii. Time spent looking at digital screens
12
Which of the following harms digital well-being?
ii. Cyberbullying and online addiction
13
Which tool can help control screen time and app usage?
ii. Digital Well-Being app / Parental control
14
Which BEST represents good netizenship?
ii. Respecting others' opinions and using polite language
15
You receive a message with false information. What to do first?
iii. Check its authenticity before sharing
16
A classmate posts rude comments in a group chat. Best action?
ii. Report/block and remind them about online respect
17
Which shows responsible use of digital content?
iii. Citing sources when using information from online articles
18
A friend is being cyberbullied. What do you do as a good netizen?
iii. Support friend and report the bully to trusted adults/platform
19
Video clip has background noise and long pauses. Best editing approach?
ii. Cut noisy/silent parts and use transitions to make it smooth
20
Introduction clip has mistakes at the beginning. What to do?
iii. Trim mistakes from introduction and join clips in logical order
B. Very Short Answer Questions
B1. What is digital technology?
Digital technology refers to electronic systems and devices that store, process, and transmit data using binary signals (0s and 1s). Examples include computers, smartphones, and digital cameras.
B2. Give any one example of a digital device.
Smartphone (also acceptable: computer, digital camera, digital watch)
B3. What is digitization?
Digitization is the process of converting analog data (text, images, audio) into digital binary format (0s and 1s) so it can be stored and processed by computers.
B4. Convert 3 GB into MB.
3 GB = 3 × 1024 MB = 3072 MB
B5. What is digital well-being?
Digital well-being means maintaining a healthy, balanced relationship with technology — using devices in a way that supports mental, physical, and emotional health rather than harming it.
B6. Ravi spends 6 hours daily on mobile. Suggest one step to improve his digital well-being.
Ravi should set a daily screen time limit using a Digital Well-Being app or parental control to restrict and monitor his mobile usage.
B7. A friend receives harmful messages and feels stressed. One action they can take?
They should block and report the sender, take a break from the device, and inform a trusted adult (parent/teacher) about the harmful messages.
B8. Student wants to share a classmate's funny video without permission. Right choice?
The student should NOT share the video. Sharing someone's video without consent violates their privacy. They must ask for permission first.
C. Short Answer Questions
C1. Teacher wants to send assignments electronically but some students have poor internet. Suggest one method.
The teacher can use Email. Students can download assignments during brief periods of connectivity and work offline. Alternatively, USB/pen drive sharing requires no internet at all, making it reliable even in low-connectivity areas.
C2. Company wants to reduce errors in data transmission over long distances. Which type of communication?
They should use Digital communication. Digital signals are less affected by noise and distortion, and support error detection and correction, ensuring accurate data transmission over long distances unlike analog signals which degrade with distance.
C3. One advantage of digital communication over analog for online classes.
Digital communication is less affected by noise and distortion, ensuring clearer audio and video during online classes. Unlike analog signals, digital signals maintain quality over distance, providing a more reliable learning experience.
C4. Student unsure about copyright rules while sharing study materials digitally. What should they do?
The student should check if the material has a Creative Commons or open license, always give proper credit/citation to original authors, use only content that is legally permitted for sharing, and avoid distributing copyrighted materials without permission.
D. Long Answer Questions
D1. Write four differences between digital and analog communication.
| S.N. | Digital Communication | Analog Communication |
|---|---|---|
| 1 | Uses discrete binary signals (0s & 1s) | Uses continuous electrical signals |
| 2 | Less affected by noise and distortion | More affected by noise and distortion |
| 3 | Accuracy maintained over long distances | Quality degrades with distance |
| 4 | Supports error detection and correction | Error correction is difficult |
D2. School wants to share notes electronically. Explain four digital communication methods and their advantages.
1. Email
Files and documents can be attached and sent to all students at once; accessible anytime, even after brief connectivity.
2. WhatsApp / Messaging App
Instant sharing of PDFs, images, and videos; works on basic smartphones and supports group sharing.
3. Google Classroom / LMS
Organized platform where teachers upload materials; students access anytime; tracks assignments and submissions.
4. USB / Pen Drive
Works without internet; ideal for poor-connectivity areas; fast, reliable offline file transfer.
D3. Student records a lecture with long pauses and background noise. Suggest two steps and explain why.
Step 1 — Trim / Cut Long Pauses
Use video editing software to identify and remove silent or idle sections from the timeline.
⚠ Why important: Pauses waste viewers' time and reduce engagement. Trimming keeps content focused and professional.
Step 2 — Apply Noise Reduction
Use the audio editing feature (noise reduction/filter) to remove background noise from the recording.
⚠ Why important: Background noise makes the lecture hard to follow. Clear audio ensures the content is understandable and easier to learn from.
D4. School event video has blurry parts and clips that are too long. Suggest two editing steps and explain why.
Step 1 — Remove / Replace Blurry Clips
Delete the blurry sections or replace them with clearer alternative footage.
⚠ Why important: Blurry footage looks unprofessional and makes content difficult to view, lowering the video's overall quality.
Step 2 — Trim Overly Long Clips
Use the trim/cut tool to shorten clips to only the essential, relevant portions.
⚠ Why important: Shorter, focused clips maintain viewer attention and make the final video concise, watchable, and impactful.
D5. Three video clips with uneven audio levels. Explain two ways to make the final video professional.
Way 1 — Normalize / Adjust Audio Levels
In the editing software, select each clip and adjust the audio volume so all three clips have a consistent, balanced level — not too loud or too soft.
⚠ Why important: Consistent volume prevents sudden audio jumps between clips, making the video comfortable and professional to watch.
Way 2 — Apply Noise Reduction per Clip
Clean background noise from each clip individually using audio filters, then match the audio quality across all clips for a uniform sound.
⚠ Why important: Removing noise from each clip separately ensures the entire video has clean, clear audio throughout.
D6. Multiple clips for a school project video are in the wrong sequence. How to reorder and join, and why is sequence important?
How to reorder and join:
Step 1
Open editing software (CapCut, Filmora, Premiere Pro). Import all clips.
Step 2
Drag clips into the timeline in logical order: Introduction → Main Content → Conclusion.
Step 3
Trim unnecessary parts from each clip, then add smooth transitions (fade/dissolve) between clips.
Step 4
Preview the full video, then export as MP4.
Why sequence is important: Correct sequence tells a logical, coherent story. Wrong order confuses the audience, breaks the flow of information, and undermines the video's message. A well-ordered video looks professional and is easier to understand.