Bibha Chowdhuri: The Beam of Light – Class 8 English Poorvi Question Answer (NCERT 2026–27)

Complete solutions for Class 8 English Poorvi Unit 5 (Science and Curiosity) – “Bibha Chowdhuri: The Beam of Light that Lit the Path for Women in Indian Science”: summary, theme, word meanings and every textbook exercise (Let us discuss, think and reflect, learn, listen, speak, write, explore) answered in full text. We keep the questions exactly as in the NCERT book, and write out every match, fill-in and activity as readable text.

Class: 8 Subject: English Book: Poorvi Unit: 5 – Science and Curiosity Type: Prose / Non-fiction (Biography) Session: 2026–27
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About the text

“Bibha Chowdhuri: The Beam of Light that Lit the Path for Women in Indian Science” is a biographical, non-fiction piece from Unit 5, ‘Science and Curiosity’. It tells the inspiring life story of Bibha Chowdhuri (1913–1991), regarded as India’s first woman physicist. Working in the male-dominated field of high-energy particle physics and cosmic rays, she made important contributions yet remained largely unrecognised in her lifetime. The text links her quiet, pioneering struggle to the achievements of today’s women scientists in ISRO, showing how one person’s courage can light a path for many.

Summary

At a time when Indian women had very little access to education, Bibha Chowdhuri rose as ‘a rare beam of light’ in science. Born in Kolkata in 1913, in a traditional pre-independence India, she defied social expectations and chose physics – a field then dominated by men. Her persistence earned her a place at the Bose Institute, where she became the first Indian woman to work in high-energy particle physics.

In 1945 she went to the University of Manchester to research cosmic rays under the celebrated Nobel Laureate Patrick M.S. Blackett. Newspapers introduced her as ‘India’s New Woman Scientist – She has an eye for Cosmic Rays’. Her most notable work was on the discovery of pi-mesons, a subatomic particle. In 1950 she was even nominated for a Nobel Prize by Erwin Schrödinger, though the nomination was unsuccessful. Despite her talent, she remained in the shadow of her male colleagues and received no awards during her lifetime, yet she kept working tirelessly.

On returning to India in 1949, she became the first woman faculty member at the Tata Institute of Fundamental Research (TIFR), chosen by Homi J. Bhabha. She later worked at the Physical Research Laboratory in Ahmedabad and the Saha Institute of Nuclear Physics in Kolkata, continuing her research on cosmic rays under mentors like Vikram Sarabhai. She died in 1991, her story largely forgotten. In 2019 the International Astronomical Union honoured her by renaming a star – HD 86081 in the constellation Leo – as ‘Bibha’, meaning ‘beam of light’, and in 2020 the Government of India declared a chair professorship in her name. Her legacy now inspires India’s women scientists, from ISRO’s ‘Rocket Woman’ Dr. Ritu Karidhal Srivastava to the many women behind Chandrayaan-3.

Theme & message

The central theme is the quiet courage and pioneering spirit of women in science. The text shows that Bibha Chowdhuri’s struggle against social barriers and gender bias laid the foundation for the women who lead India’s space missions today. Its message is that recognition may come late, but true contribution endures; talent and persistence can ‘light a path’ for others even when society overlooks it. It also reminds readers that progress towards equality in STEM is real but still unfinished.

About the writing

This piece is an NCERT-prepared biographical article (no single named author). It is written in an admiring, reflective style that blends factual detail – dates, institutions and discoveries – with poetic imagery built around light and stars. The writer uses the recurring metaphor of Bibha as a ‘beam of light’ and a ‘beacon’, tying her name (which means ‘beam of light’) to the star renamed in her honour. The tone is both informative and inspirational, aiming to restore a forgotten scientist to her rightful place and to motivate young readers, especially girls, to pursue science.

Word meanings

WordEnglish meaningHindi meaning
trailblazerspeople who are the first to do something others later followनई राह बनाने वाले अग्रणी
equitabletreating everyone fairly and in the same wayन्यायसंगत, समान
defied the oddsachieved something despite difficultiesविपरीत परिस्थितियों में सफल होना
toweringvery high or greatविशाल, ऊँचा
persistenceability to keep doing something difficultदृढ़ता, लगन
delvedexamined something in detail to find informationगहराई से अध्ययन करना
cosmic rayshigh-energy particles from spaceब्रह्मांडीय किरणें
scepticaldoubtfulसंदेहपूर्ण
notableremarkable, worth noticingउल्लेखनीय
cuspthe point at which something is about to change/happenदहलीज़, कगार
peripheryboundary, outer edgeपरिधि, किनारा
acclaimpraiseप्रशंसा
tenacitydetermination to continue what you are doingदृढ़ निश्चय
ignitearouse, set offप्रज्वलित करना, जगाना
autonomousindependentस्वायत्त, स्वतंत्र
arduousdifficult, needing a lot of effort and energyकठिन, श्रमसाध्य
starkclear, plainस्पष्ट, कठोर
beacona good example that gives people hope and encouragementप्रेरणा-स्तंभ, मार्गदर्शक प्रकाश
pioneerone of the first to explore or work in a new fieldअग्रदूत, प्रवर्तक
luminarya person who inspires or influences othersविशिष्ट व्यक्ति, प्रकाश-स्तंभ

Let us discuss

I. Arrange the following events from Bibha Chowdhuri’s life in the correct order of occurrence.

ANSWERCorrect order: 3 → 5 → 6 → 2 → 1 → 43. Bibha Chowdhuri was born in pre-independent India (1913).5. She joined the University of Manchester under the guidance of the celebrated Nobel Laureate, Patrick M.S. Blackett (1945).6. She was nominated for a Nobel Prize by Erwin Schrödinger (1950). [Note: she returned to India and joined TIFR in 1949; the nomination followed in 1950, after her years at Manchester.]2. She became the first woman faculty member at the Tata Institute of Fundamental Research (TIFR).1. The International Astronomical Union (IAU) honoured her legacy by renaming a star in the constellation Leo – HD 86081 – as ‘Bibha’ (2019).4. The Government of India declared a chair professorship in Bibha’s name (2020).

Let us think and reflect

I.1. Extract – “In 1945, Bibha’s academic journey took her to the University of Manchester. Under the guidance of the celebrated Nobel Laureate, Patrick M.S. Blackett, she delved deeper into the field of cosmic rays. Her Ph.D. thesis on cosmic rays earned local recognition, with newspapers introducing her as ‘India’s New Woman Scientist—She has an eye for Cosmic Rays’.”

ANSWER(i) The mention of Patrick M.S. Blackett, a Nobel Laureate, is significant because it shows that Bibha was working with and being guided by one of the finest scientists in the world. It highlights both the high quality of her research environment and her own merit in earning a place under such an eminent mentor.(ii) B. The world was still doubtful about the capabilities of women scientists.(iii) B. frequently seen in public. (‘Celebrated’ means famous, respected and renowned for achievements – not merely seen in public.)(iv) The phrase ‘She has an eye for Cosmic Rays’ suggests that she had a special talent and keen insight for observing, studying and understanding cosmic rays.

I.2. Extract – “The journey from Bibha Chowdhuri’s era to today’s women scientists has been long and arduous, but it is also inspiring. The struggles Chowdhuri faced are a stark reminder of how far we’ve come—and how much further we have to go… Bibha Chowdhuri’s legacy lives on… As the stars of Indian science shine brighter, Bibha Chowdhuri, the beacon–‘beam of light,’ will always guide the way.”

ANSWER(i) B. The challenges remain, but progress has been made.(ii) The phrase ‘Bibha Chowdhuri’s legacy lives on’ suggests that her work, courage and example continue to influence and inspire women scientists even after her death.(iii) She is referred to as a ‘beacon’ and a ‘beam of light’ because she gave hope and guidance to other women, showing them the way into science; her name itself means ‘beam of light’, and like a beacon she continues to inspire and lead future generations.(iv) This sentence is an opinion (it expresses the writer’s admiring view; whether her story ‘continues to inspire’ is a judgement, not a verifiable fact).

II. Answer the following questions.

ANSWER1. Bibha Chowdhuri is considered a pioneer because she was India’s first woman physicist and the first Indian woman to work in high-energy particle physics. She entered a field dominated by men, contributed to important research on cosmic rays and the discovery of pi-mesons, and became the first woman faculty member at TIFR – opening the way for women who came after her.2. Her nomination for the Nobel Prize in 1950 by the famous physicist Erwin Schrödinger shows that her work was of the very highest scientific quality. It tells us she was a brilliant and capable researcher whose talent was recognised by one of the greatest scientists of the time, even if the prize itself did not come to her.3. The text says she ‘never received any awards during her lifetime, but continued her work tirelessly’ and that ‘her work went on quietly, as she remained in the periphery of Indian scientific acclaim’. This shows she worked out of dedication to science, not for fame or rewards.4. Literally, a real star (HD 86081 in Leo) was renamed ‘Bibha’, so her name now shines in the sky. Symbolically, since ‘Bibha’ means ‘beam of light’, the renaming honours the light she brought to Indian science and makes her, fittingly, a ‘star in heaven’ that will be remembered forever.5. Today women in ISRO are not just participants but leaders of major missions like the Mars Orbiter Mission and Chandrayaan-3. This reflects a broad change in society – from doubting women’s abilities in Bibha’s time to trusting and celebrating them in top scientific and leadership roles in STEM.6. The writer’s purpose is to bring a forgotten pioneer back into public memory, to give due credit to women’s contributions in science, and to inspire young readers – especially girls – to break barriers and pursue careers in STEM.7. The text can change perceptions by showing that women can succeed even in fields long dominated by men. It encourages people to question old biases and to believe that, with persistence and opportunity, women can excel in any traditionally male-dominated field, from engineering to space science.

Let us learn

I. Complete the crossword puzzle by filling in the antonyms (from the text).

ANSWERAcross4. core → periphery5. dependent → autonomous7. extinguish → ignite8. terrestrial → cosmicDown1. effortless → arduous2. weakness → persistence (strength/tenacity)3. neglect → acclaim6. trivial → notable

II. Substitute the underlined phrase with the suitable words from the box (physicist, luminaries, pioneers, peers, barriers, persistence).

ANSWER1. They are considered to be the first people to start the online markets. → pioneers2. A scientist who studies matter, energy, light, etc. → physicist3. Most of my friends are my classmates and are my age. → peers4. We first welcomed all the famous and important people in folk song for the award ceremony. → luminaries5. My brother finally succeeded in his business because of his continuous efforts and determination. → persistence6. We should remove all the things that block our way in achieving success. → barriers

III. Make words by adding suitable suffixes -ship, -ment and -hood.

ANSWER1. member + ship = membership2. govern + ment = government3. partner + ship = partnership4. child + hood = childhood5. citizen + ship = citizenship6. entertain + ment = entertainment7. brother + hood = brotherhood8. agree + ment = agreement

IV. Circle the acronyms in the grid.

ANSWERThe five acronyms hidden in the grid are:1. National Aeronautics and Space Administration → NASA2. All India Institute of Medical Sciences → AIIMS3. Ayurveda, Yoga and Naturopathy, Unani, Siddha, and Homoeopathy → AYUSH4. National Institute of Pharmaceutical Education and Research → NIPER5. World Health Organization → WHO

V. Complete the news report with the passive form of the verbs (discover, test, measure, publish, record, take).

ANSWER1. were published2. was discovered3. was tested4. were recorded5. were taken6. was measuredReads: “Last year, significant advancements in medical science were published… when a new vaccine for malaria was discovered. The vaccine was tested through several clinical trials and results were recorded… blood samples were taken regularly… The amount of antibodies produced was measured carefully…”

VI. Rewrite the experiment report using passive verbs (sample).

SAMPLE ANSWERAn experiment was conducted to investigate the effects of light on plant growth. Various plants were placed under different light conditions and their growth was measured over several weeks. Data was recorded daily to track the height of each plant. At the end of the experiment, the results were analysed, and it was found that plants exposed to natural light grew significantly taller than those under artificial light. It was concluded that sunlight plays a crucial role in plant development. The findings were presented to the class, highlighting the importance of light in enhancing photosynthesis and overall plant health.

VII. Complete the passage on the landing of Chandrayaan (choose the correct option).

ANSWER(i) C. was launched(ii) B. was positioned(iii) B. was adjusted(iv) B. was slowed down(v) D. was released

Let us listen

(You listen to a podcast called ‘Tech Talks’ with host Faizy, about how Artificial Intelligence benefits humankind in four segments – healthcare, environmental sustainability, education and accessibility.)

I. Answer the questions by selecting the correct options.

ANSWER1. One key benefit of AI in healthcare → (ii) Provides personalised treatments and faster diagnoses.2. AI’s role during the global pandemic → (ii) AI assisted in speeding up the discovery of new medicines.3. AI’s role in renewable energy → (iii) AI is improving the performance of wind turbines and solar panels.4. What AI offers teachers in education → (iii) Helps teachers analyse student performance.5. A user-friendly feature for people with disabilities → (ii) Improves speech recognition and voice command technologies.

Let us speak

I. Conduct a panel discussion on the topic ‘Evaluating the Impact of Mobile Phones – Beneficial or Harmful’, with roles of Moderator, Principal, Teacher, Parent and Student.

SPEAKING ACTIVITY – SAMPLE POINTSModerator: “Welcome, everyone. Today we discuss whether mobile phones are beneficial or harmful. Let us hear each speaker in turn.”Principal (opposed): Phones disrupt discipline, distract students in class and encourage cheating and time-wasting.Teacher (partly in favour): Phones are valuable for research, online lessons and quick communication, but their use must be limited and supervised.Parent (opposed): Too much screen time harms children’s eyes and sleep, reduces real social interaction and can expose them to unsafe content.Student (in favour): Phones keep us connected, give instant access to learning material, maps and emergency help, and build digital skills.Moderator (summing up): “We see that mobile phones are useful tools but need responsible, balanced use. Thank you all.” (Do this aloud in a group of five.)

Let us write

I. As the student editor, write a report on the Zonal Science Exhibition for your school magazine (past tense, passive voice, third person). Sample below.

SAMPLE REPORTZonal Science Exhibition Sparks Young Minds
By Aarav Mehta, Student EditorA Zonal Science Exhibition was hosted by our school on 12 August 2026 in the school auditorium from 9 a.m. to 2 p.m. It was organised by the Science Department to encourage scientific curiosity and innovation among students. Teams of students from 25 schools participated enthusiastically. The event was inaugurated by the Chief Guest, Dr. Anjali Verma, a senior scientist from ISRO.Several competitions were held, including a Science Quiz, a Working Models contest and a Poster-making event. Models on topics such as renewable energy, water harvesting, the solar system and a miniature Chandrayaan lander were exhibited and admired by visitors. The trophy for the best exhibit was won by Team Nalanda of our school for their working model of a smart waste-segregation system.The Chief Guest praised the creativity and clarity of the young participants and urged them to keep questioning and experimenting. Visitors observed that the exhibition was both educational and inspiring. The day was declared a grand success by the Principal. (Write your own report in about 120–150 words.)

Let us explore

ANSWER / ACTIVITY NOTESI. AR and VR in learning: Augmented Reality (AR) adds digital elements to the real world (often through a phone camera), while Virtual Reality (VR) gives a fully immersive simulated experience. NCERT’s e-Pathshala AR app lets students experiment with concepts beyond textbooks, turning passive listeners into active learners – in line with the Digital India vision (skill, scale and speed). Explore it at ciet.ncert.gov.in/ar-vr.II. Rashtriya Vigyan Puraskar (RVP): India’s new national awards in Science, Technology and Innovation – Vigyan Ratna (lifetime achievement), Vigyan Shri (distinguished contribution), Vigyan Yuva-Shanti Swarup Bhatnagar (young scientists up to 45 years) and Vigyan Team (a team of three or more). They recognise inspiring contributions by scientists, technologists and innovators.III. Look up the brochure on women pioneers in different fields, then discuss with your teacher and classmates the women scientists, doctors, engineers and explorers who inspire you most. (Project/discussion task.)

Extra questions

Short answer (30–40 words)

1. Who was Bibha Chowdhuri and where was she born?

ANSWERBibha Chowdhuri (1913–1991) was India’s first woman physicist. She was born in 1913 in Kolkata, in pre-independence India, and worked in high-energy particle physics and cosmic rays.

2. Under whom did Bibha study at the University of Manchester?

ANSWERAt Manchester she researched cosmic rays under the guidance of the celebrated Nobel Laureate Patrick M.S. Blackett, deepening her work in the field.

3. What was Bibha Chowdhuri’s most notable scientific contribution?

ANSWERHer most notable contribution was her work towards the discovery of pi-mesons, a subatomic particle, which showed her remarkable talent in particle physics.

4. How did the International Astronomical Union honour Bibha in 2019?

ANSWERIn 2019 the IAU renamed a star, HD 86081 in the constellation Leo, as ‘Bibha’, meaning ‘beam of light’, making her a ‘star in heaven’.

5. Who is called the ‘Rocket Woman of India’?

ANSWERDr. Ritu Karidhal Srivastava is called the ‘Rocket Woman of India’ for her key role in the Mars Orbiter Mission and her leadership in Chandrayaan-2 and Chandrayaan-3.

Long answer (100–120 words)

6. Describe the struggles and achievements of Bibha Chowdhuri.

ANSWERBibha Chowdhuri lived in a time when Indian women had little access to education, yet she chose physics, a field dominated by men. Through sheer persistence she joined the Bose Institute and became the first Indian woman in high-energy particle physics. She researched cosmic rays at Manchester under Patrick Blackett, contributed to the discovery of pi-mesons and was nominated for a Nobel Prize by Erwin Schrödinger in 1950. She became the first woman faculty member at TIFR. Despite receiving no awards in her lifetime and remaining in the shadow of male colleagues, she worked tirelessly. Today, a renamed star and a chair professorship honour her pioneering legacy.

7. How does Bibha Chowdhuri’s life connect to the women scientists of today?

ANSWERThe text shows that the success of today’s women scientists is ‘built upon the shoulders of pioneers like Bibha Chowdhuri’. In her era, women struggled even to study; she had to fight bias and worked quietly without recognition. Yet she opened doors by being the first in many roles. Today, over fifty women contributed to Chandrayaan-3, and leaders like Dr. Ritu Karidhal Srivastava head major space missions. They develop autonomous spacecraft systems and manage mission-critical operations. This journey reflects how society’s attitude has shifted from doubt to trust. Bibha’s courage helped ‘ignite’ this progress, and she remains a guiding ‘beacon’ for them.

MCQs & Assertion–Reason

1. In which year and city was Bibha Chowdhuri born?

(a) 1913, Kolkata   (b) 1920, Mumbai   (c) 1913, Ahmedabad   (d) 1900, Delhi

ANSWER(a) 1913, Kolkata.

2. Bibha Chowdhuri is regarded as India’s first woman:

(a) astronaut   (b) physicist   (c) doctor   (d) engineer

ANSWER(b) physicist.

3. At the University of Manchester, Bibha worked under:

(a) Homi J. Bhabha   (b) Vikram Sarabhai   (c) Patrick M.S. Blackett   (d) Erwin Schrödinger

ANSWER(c) Patrick M.S. Blackett.

4. Who nominated Bibha Chowdhuri for a Nobel Prize in 1950?

(a) Patrick Blackett   (b) Erwin Schrödinger   (c) Homi J. Bhabha   (d) Vikram Sarabhai

ANSWER(b) Erwin Schrödinger.

5. Her most notable contribution was the discovery of:

(a) electrons   (b) pi-mesons   (c) X-rays   (d) neutrons

ANSWER(b) pi-mesons.

6. She became the first woman faculty member at:

(a) Bose Institute   (b) TIFR   (c) Saha Institute   (d) PRL Ahmedabad

ANSWER(b) TIFR (Tata Institute of Fundamental Research), selected by Homi J. Bhabha.

7. In 2019, the IAU renamed which star ‘Bibha’?

(a) HD 86081 in Leo   (b) Sirius   (c) Proxima Centauri   (d) Vega

ANSWER(a) HD 86081 in the constellation Leo.

8. The name ‘Bibha’ means:

(a) bright star   (b) beam of light   (c) morning sky   (d) new dawn

ANSWER(b) beam of light.

9. Dr. Ritu Karidhal Srivastava is popularly known as:

(a) Missile Woman   (b) Rocket Woman of India   (c) Star Woman   (d) Space Queen

ANSWER(b) Rocket Woman of India.

10. The field of science in which Bibha Chowdhuri mainly worked was:

(a) genetics   (b) cosmic rays & particle physics   (c) astronomy of planets   (d) chemistry

ANSWER(b) cosmic rays and high-energy particle physics.
MCQ Answer Key: 1-(a), 2-(b), 3-(c), 4-(b), 5-(b), 6-(b), 7-(a), 8-(b), 9-(b), 10-(b).

Assertion–Reason – choose: (a) A and R true, R explains A; (b) A and R true, R does not explain A; (c) A true, R false; (d) A false, R true.

1. Assertion (A): Bibha Chowdhuri is called ‘a beam of light’.

Reason (R): Her name means ‘beam of light’, and she lit a path for other women in science.

ANSWER(a) Both true and R correctly explains A.

2. Assertion (A): Bibha Chowdhuri received many awards during her lifetime.

Reason (R): She continued her scientific work tirelessly despite a lack of recognition.

ANSWER(d) A is false (she received no awards in her lifetime), but R is true.

3. Assertion (A): Bibha Chowdhuri became the first woman faculty member at TIFR.

Reason (R): She was personally selected by Homi J. Bhabha after her return to India in 1949.

ANSWER(a) Both true and R correctly explains A.

4. Assertion (A): The press title ‘India’s New Woman Scientist’ shows women scientists were fully accepted in the 1940s.

Reason (R): The world was still sceptical about the capabilities of women scientists at that time.

ANSWER(d) A is false (calling her a novelty shows women were not yet fully accepted), but R is true.

5. Assertion (A): Today’s women in ISRO are leaders, not just participants, in major missions.

Reason (R): Society’s attitude towards women in STEM has changed for the better since Bibha’s time.

ANSWER(a) Both true and R correctly explains A.

Exam tips & common mistakes

Exam tips

Remember the key dates and facts in order: born 1913 (Kolkata) → Bose Institute → Manchester 1945 (under Blackett, cosmic rays) → TIFR 1949 (chosen by Bhabha) → Nobel nomination 1950 (by Schrödinger) → died 1991 → star renamed 2019 → chair professorship 2020. Always link her name ‘Bibha’ = ‘beam of light’ to the metaphors of ‘beacon’ and ‘star’ in answers about imagery and symbolism. For value-based questions, stress persistence, courage and breaking barriers.

Common mistakes to avoid

Do not confuse the mentors – Blackett guided her at Manchester, Schrödinger nominated her for the Nobel, Bhabha selected her for TIFR, and Vikram Sarabhai mentored her later work. Do not write that she won a Nobel Prize – she was only nominated and it was unsuccessful. Do not say she received awards in her lifetime – the honours (renamed star, chair professorship) came after her death. In passive-voice answers, match the verb to the subject (singular/plural) carefully.

FAQs

Who was Bibha Chowdhuri?

Bibha Chowdhuri (1913–1991) was India’s first woman physicist. She worked on cosmic rays and high-energy particle physics and was the first woman faculty member at TIFR.

Why was a star named after Bibha Chowdhuri?

In 2019, the International Astronomical Union renamed the star HD 86081 in the constellation Leo as ‘Bibha’, meaning ‘beam of light’, to honour her contributions to Indian science.

What is the main message of the text?

That women’s persistence and courage can break barriers in science; Bibha’s quiet pioneering work laid the foundation for today’s women scientists in ISRO and beyond.

Questions are taken verbatim from the NCERT Poorvi textbook; summaries and answers are written originally by ClearStudy.

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