Complete Summary and Solutions for My Brother’s Great Invention – Class 7 English Chapter 3 – Explanation, Questions & Answers
A detailed summary, explanation, and complete NCERT solutions for Class 7 English Chapter 3 “My Brother’s Great Invention” from the textbook Poorvi, including plot, character analysis, exercises, and all questions and answers for easy understanding.
Updated: 6 months ago
My Brother’s Great Invention
Class 7 English NCERT • Chapter 3 — Dreams & Discoveries
Summary of “My Brother’s Great Invention”
Anita narrates a humorous and slightly suspenseful episode about her younger brother Anand, who fancies himself a scientist and constantly invents gadgets that usually create trouble rather than solve it. When a series of thefts occur in their colony, Anand decides to make a burglar alarm. He rigs a contraption to trigger a loud clanging noise and topple a water-bag on anybody who opens the door “gently”.
On the night their parents leave for a wedding, Anand prepares a time machine and promises not to try it while they're away — but, as the story unfolds, strangers creep into the house at night. A tense but comical series of events leads to a ruffian (Boppa) entering, noises in the next room, and later the mysterious disappearance of Boppa — leading Anand to claim the time machine worked. The time machine is dismantled afterward for safety, and Anand moves on to new projects, convinced he is a genius. (Adapted from the textbook extract.)
Source: Extract from the uploaded PDF. :contentReference[oaicite:2]{index=2}
Key Themes
- Curiosity and inventiveness (positive and comic)
- Family dynamics — teasing, responsibility, and consequences
- Humour arising from good intentions gone wrong
- Imagination vs reality (time machine episode)
Main Characters
Anita (Narrator)
Fourteen-year-old narrator who is sensible and often exasperated by her brother's antics.
Anand (Brother)
A year younger, a tinkerer who believes he is a scientist. Creative, experimental, and often careless.
Parents & Neighbours
Parents are worried and protective; neighbours like Sharma Aunty and Boppa add to the plot tension.
Textbook Questions & Answers
1. What prompted Anand to create the burglar alarm?
There had been a rush of thefts in the colony, and Anand believed a burglar alarm would protect the house. He wanted to help and indulge his inventive hobby. (Reference: extract). :contentReference[oaicite:3]{index=3}
2. How did Anand’s father become the target of the burglar alarm?
Anand rigged the alarm to work when the door was opened gently (as his father always opens it), which caused the water bag to fall on him. :contentReference[oaicite:4]{index=4}
3. Why did Mr. Sharma not believe Anand about his time machine?
Anand had a history of making “inventions” that didn’t work as intended, so adults were sceptical of his claims; they treated the time-machine idea lightly. :contentReference[oaicite:5]{index=5}
4. What happened to Boppa?
Boppa (the ruffian) disappears after the chaotic events; the story suggests he may have been scared away or—according to Anand—transported by the time machine. The time machine was later dismantled. :contentReference[oaicite:6]{index=6}
Comprehension (Passage-based)
Passage: “It’s quite simple. The moment the door opens, this alarm is tripped off and makes a clanging sound.”
(i) Who is speaking? — Anand, explaining his burglar alarm. :contentReference[oaicite:7]{index=7}
(ii) What does he mean? — The alarm is designed to detect a gentle opening and create noise and a water-fall prank to stop a thief.
Read the extract about the night noises and answer:
Q: What might the muffled thumps, eerie whine and low humming indicate?
A: They suggest either the intruder moving, the effects of Anand’s inventions, or something malfunctioning — which builds suspense. :contentReference[oaicite:8]{index=8}
Grammar & Vocabulary
- Word Meanings (from the text):
- tinkering — experimenting or fiddling with gadgets. :contentReference[oaicite:9]{index=9}
- sceptical — doubtful. :contentReference[oaicite:10]{index=10}
- clanging — a loud ringing sound. :contentReference[oaicite:11]{index=11}
- crestfallen — sad and disappointed. :contentReference[oaicite:12]{index=12}
Grammar Focus
- Onomatopoeia — words that imitate sounds (clanging, humming, crash). :contentReference[oaicite:13]{index=13}
- Cause & effect — identify causes (Anand’s alarm) and effects (Papa getting soaked, tension in house). :contentReference[oaicite:14]{index=14}
- Direct & Indirect Speech — practise converting dialogues from the story.
Activities & Projects
- Draw a labelled diagram of Anand’s burglar alarm (based on the blueprint mentioned in the story). :contentReference[oaicite:15]{index=15}
- Write an alternate ending: What would you do if you found a time machine? (creative writing)
- List three inventions you think would help your neighbourhood, and write how they work.
- Identify and collect onomatopoeic words from the extract and create a short sound-poem.
Interactive Quiz – Test Yourself!
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Quick Revision
Anita narrates → Anand is an inventor → Burglar alarm misfires → Strange night noises → Boppa disappears → Time machine dismantled → Theme: Curiosity, consequences, humour. :contentReference[oaicite:16]{index=16}
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