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Madame Marie Cruie (1867-1934)

Madame Marie Cruie was a French physicist and chemist famous for her work on radioactivity. She was a pioneer in the field of radioactivity and the first person honored with two Nobel Prizes, first in physics and second in chemistry. She was also the first female professor at the University of Paris.
Maria Skłodowska was born on November 7, 1867, in Warsaw, Poland. Her father belonged to a farmer family, but studied at the Warsaw High School and took up teaching mathematics and physics there. Her mother was a good pianist. When Marie was 10 years old, she lost her mother due to tuberculosis. At that time, the Russian Czar ruled Poland. Marie’s father was forced to leave school for his revolutionary speeches and took up the cause for freedom struggle. He started a boarding house for students, but it did not do well. He could hardly manage a square meal for his family. Marie’s elder siblings Bronia and Joseph won gold medals at high school. Joseph was admitted at university to study medicine. Poland did not have any provision for higher education for girls, so her father asked Bronia to take tuitions in Warsaw, save some money and then go to Paris for further medical education.
Since childhood, Marie had a very good memory and at 17, won the gold medal on completion of her education from the school at the Russian lycee. As her father, a teacher of mathematics and physics, lost his savings through bad investment, she had to take work as teacher and at the same time, took part clandestinely in the nationalist ‘free university’ reading in Polish to women workers. To improve her failing health, her father sent her to spend some time in the rural area. On her return after a year, her father found her a healthy and beautiful girl. Seeing the family’s weak financial condition, both sisters decided to help their father. One would work and the other would continue study. Bronia left for Paris to study medicine and Marie started earning. After struggling to get some decent work, she was engaged as a governess. Gradually, she became part of that family. When the eldest son of the family studying at Warsaw University returned, he immediately took a liking for Marie. Both were attracted towards each other. But his mother did not approve of this relationship between her son and a maid. Heartbroken, Marie left the job. She even thought of committing suicide, but nature had something else in store for her. She soon got another job. Meanwhile, Bronia completed her studies and married a classmate. Sometime later, her sister asked Marie to join them in Paris.

In Paris, the 23 year old Marie resumed study in science at Sorbonne University. She worked very hard for four years. She rented a small room on the upper floor of a house in a poor locality and concentrated fully on her education. She lived a life with limited means. Winters were particularly difficult, for she had a few warm clothes. Meat, wine or eggs were luxuries she could ill-afford. She used to earn by doing odd jobs. She appeared for her post-graduation examination in physics in 1894 and stood first. Next year, she again appeared for mathematics and stood second. She had finally realized her dream.

Keeping her father’s word Marie had excelled at studies and returned home. An aging father and poor family conditions made her realize that she had to cut short her studies in Paris and stay at home. But destiny willed otherwise. In Warsaw, she met a rich lady from an aristocratic family. After hearing Marie’s story, she arranged for her scholarship. Encouraged by future prospects, Marie immersed herself in further study. With her father’s blessings she set off to Paris. Improvement in her family’s financial situation, coupled with her good results, spurred her to concentrate on her studies. Once, a Polish scientist Prof Kowalski came on a discussion. Here, she met another talented young man – his wish to see her again. After courting for a year, they got married. Marie Sklodowska became Madame Marie Curie. Pierre was a scholar and a wonderful human being. He had graduated with physics at the age of 16 and acquired a post degree at 18. Besides, he had also researched on piezo electric effect. His father was a well-Known doctor. After marriage, Marie and Pierre Curie started working together.

Meanwhile, German scientist Wilhelm Roentgen had discovered X-rays, a short wavelength radiation having immense capacity to penetrate through solid objects and across the world of science. At the same time, Henri Becquerel was carrying out research on fluorescence. After several experiments, he had come to the conclusion that there was some other element besides uranium in the raw metal pitchblende. Impressed by Marie Curie’s talent, he came to meet Marie to seek answers to some problems he had been facing. Marie and Pierre Curie took up the challenge willingly. In 1896, Becquerel discovered that some unknown rays constantly emanated from pitchblende. These rays were initially called Becquerel rays. Later, Madame Curie worked on it extensively and named this radiation type of activity as radioactivity, and the rays were called radioactive rays.

In 1897, Marie gave birth to a healthy baby girl. She was named Irene. Some time later, Pierre’s mother passed away. His doctor father moved in to live with the Curie family. Marie had left her daughter, Irene, under the care of a maidservant. Having a father-in-law around with a baby girl, under the care of the maidservant, they could work hard in the laboratory. Later Irene followed the footsteps of her illustrious parents and earned fame. Along with her scientist husband Juliot, she won the Nobel Prize for Chemistry in 1935.

The Curie couple was sure that in pitchblende besides uranium, there was some strong radioactive element present. To separate this element from uranium was a challenge. Pitchblende was a very expensive ore and was not easily available. They came to know that Austria possessed pitchblende in abundance. They requested the Austrian government to release some pitchblende after separating uranium from it, for their research. The government agreed to provide the ore free, but the transportation was to be borne by the Curies. Finally, tons of pitchblende arrived in ships and were unloaded in a wooden shed in the Curies’ laboratory. They placed the pitchblende in a huge iron pan and allowed it boil. Thus, an unused shed became their laboratory. Two years of perseverance resulted in the separation of a small quantity of a compound of bismuth which was 300 times more powerful in radioactivity than uranium. In July 1898, they announced the discovery of a new element, which was named polonium after Poland, Marie’s motherland. All this time, they were aware that their search for the most powerful radioactive elements and at the end of crystallization process they noticed some crystals of the new element radium.

In 1903, the Curie couple shared the Nobel Prize for Physics with Henri Becquerel. The Curie couple had then become world famous. In 1904, Marie gave birth to their second daughter Eve. Life was looking up and things were moving smoothly. Tough days and despair had gone and the family was now comfortably settled. On April 19, 1906, Pieree Curie, while returning home after attending a meeting, was run over by a farm cart in the rue Dauphine in Paris and died instantly. Marie’s world suddenly turned dark. But this spirited woman took up the responsibilities to fulfill Pierre’s dream. As a special case, the French Department of Education appointed Marie as a professor in place of Pierre and honoured her. No woman was ever given such a high position by the university. Many turned jealous about this. She continued taking care of her family, while continuing her research and taught at the university simultaneously. She efficiently discharged all the responsibilities that she shouldered. In 1910, she succeeded in isolating pure radium. In 1911, she was once again honoured with the Nobel Prize. It was for Chemistry this time. Madame Curie was the first person to receive this honour twice and that too in two different branches of science.

In July, 1914, Madame Curie fulfilled the dream of her late husband to establish a huge laboratory in Paris in his fond memory. Meanwhile, World War I had begun, so it could not become operational. Moreover, her colleagues were engaged in war duty. Soon after the war ended, the laboratory started functioning. On July 4, 1934, this spirited lady and first woman scientist to receive the Nobel Prize breathed her last near Sallanches, France.

Alexander Fleming (1881 - 1955)

Sir Alexander Fleming was a biologist and pharmacologist. His best achievements are the discovery of the enzyme lysozyme in 1923 and the antibiotic substance penicillin from the fungus Penicilliu notatum in 1928, for which he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Walter Florey and Ernst Boris Chain. In 1999, In Time Magazine name Fleming one of the 100 most important people of the 20th Century for his discovery of penicillin, and stated, “It was a discovery that would change the course of history.

He was born on 6th of August, 1881 at Lochfield near Darvel in Ayrshire, Scotland. He was the son of Hugh Fleming. His father died when Alexander was just seven year old. He attended louden Moor School, Darvel School, and Kilmarnock Academy & after that he went London to work as a shipping clerk. He spent four years in a shipping office and after that moved to St. Mary’ Medical school, London University. He qualified with distinction in 1906 and began research at St. Mary’s under the guidance of Sir Almroth wright; a pioneer in vaccine therapy. He obtained M.B.B.S. (London), with Gold Medal in 1908, and became a lecturer at St. Mary’s until 1914. He was elected Professor of the school in 1928 and Emeritus Professor of Bacteriology, University of London in 1948. He was elected Fellow of the Royal Society in 1943 and knighted in 1944.

Alexander Fleming died on 11th March 1955. He is buried in St Paul's Cathedral.

















Scientist Alexander Fleming

















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Alexander Fleming

Amedeo Avogadro

Amedeo Avogadro (1776 – 1856)

Amedeo Carlo Avogadro was an Italian savant. He is renowned for his contribution to molecular theory, including what is known as Avogadro’s law. He was born in Turin, Itlay on 9 August, 1776. He was the son of Count Filippo Avogadro and Anna Maria Vercellone. His father was a distinguished lawyer and civil servant.

Avogadro went to school in Turin. Coming from a family of well established lawyers, Avogadro was guided toward a legal career, and became a bachelor of jurisprudence in 1792, at the young age of just 16 years. Four years later he gained his doctorate in ecclesiastical law and began to practice. In 1801 he was appointed secretary to the prefecture of the department of Eridano. In 1820, he became professor of physics at the University of Turin. He married Felicita Mazzé and they had six children.

As we all know today, Avogadro’s number is very large, the presently accepted value being 6.0221367 X 1023
 . The size of such a number is extremely difficult to understand. Cannizarro, around 1860, used Avogadro’s ideas to obtain a set of atomic weights, based upon oxygen having an atomic weight of 16. In 1865, Loschmidt used a combination of liquid density, gaseous viscosity, and the kinetic theory of gases, to establish roughly the size of molecules, and hence the number of molecules in 1 cm3 of gas.

Avogadro died on the 9th July, 1856. He was described as religious, but not a bigot.

C.V. Raman (Chandrasekhar Venkata Raman) 1888-1970

Dr. C.V. Raman was one of the greatest scientists of India, who was awarded the 1930 Nobel Prize in physics for his work on the scattering of light and for the discovery of the ‘Raman Effect’, which is named after him. Chandrasekhar Venkata Raman, commonly known as C.V. Raman was born on November 7, 1888 at Tiruchirapalli in Tamillandu. His mother tongue was Tamil. He was the second children of Chandrasekhar Iyer and Pravathi Ammal. His father was a lecturer in mathematics and physics. Raman was a very brilliant student right from his childhood.

At an early age, Raman moved to the city of Vishakhapatnam, which is situated in state of Andhra Pradesh, where his father accepted a position at the Mr. A V N College. Raman’s academic brilliance was established at a very young age. At the age of twelve, he finished his matriculation education and entered Mr. A V N College and two year later moved to the prestigious presidency college in Madras (Chennai). When he was the age of fifteen he finished at the head of the class too received B. A. with honours in physics and English. In those days, it was a system of government that students who did well academically were typically sent to abroad (England) for additional studies. Because of Raman’s poor health, he was not allowed to go abroad and he continued his studies at the same college. In 1907, barely seventeen, Raman received his Master degree with honors. He got first position in the University in M.A. In the same year, he married with Lokasundari Ammal and with whom he had one son, Radhakrishnan.

He completed his education in Visakhapatanam and Madras (Chennai). After getting top ranking in the Financial Civil Service competitive Exam, he was appointed as Deputy Accountant general in Calcutta. At the time of his graduation, there were few opportunities for scientists in India. This forced him to accept a position with the Indian Civil Services as an Assistant Accountant General in Calcutta. While there, he was able to sustain his interest in science by working, in his remaining time, in the laboratories of the Indian Association for the Cultivation of Science. He studied the physics of stringed instruments and Indian drums.

In 1917, he was offered the professor of Physics at the Calcutta University, and he decided to accept this opportunity. After 15 years service at the Calcutta University, he left that job and shifted to Bangalore and became the Director of the Indian Institute of Science, where two years later he continued as a professor of physics. In 1947, the new Government of Independent India appointed him as the first National Professor. He also worked in the field of magnetic attraction and theory of musical instruments. He worked out the theory of transverse vibration of bowed strings, because of superposition velocities. This does a better job in explaining bowed string vibration over Helmholtzs approach.

Professor C V Raman was also the first to investigate the harmonic nature of the sound of the Indian drums such as the tabla and the mridanga. In 1930, for the first time in its history, an Indian scholar, educated entirely in India has received highest honour in science, the ‘Nobel Prize’ in physics. In 1943, he founded ‘Raman Research Institute’, near Bangalore. His discovery of the ‘Raman Effect’ made a very distinctive contribution to Physics. He was also conferred the hishest title of ‘Bharat Ratna’ in 1954. The ‘Raman Effect’ was a demonstration of the ‘Collision’ effect of light bullets (Photons) passing through a transparent medium, whether solid, liquid or gaseous. Raman was also awarded the ‘Lenin Peace Prize’ in 1957. India celebrates National Science day on 28th February every year to commemorate Raman’s discovery.

He retired from the Indian Institute in 1948 and after one year, he established the Raman Research Institute in Bangalore, served as its director and remained active there until his death, at the age of eighty-two. Sir Venkata Raman died on Nevember 21, 1970 at Bangalore, India. We should proud on him.

Photo Gallery of C V Raman

















Sir C V Raman Painting





















Scientist C. V. Raman Photo




















Great scientist Chandrasekhar Venkata Raman















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C V Raman picture

Ice Float on water.why?

What happen when you put ice cubes in water? Is it sink or float? You have observed that the ice cubes remains just down to the surface instead of sinking. Do you know whats the reason behind it?answer : 
Water is a liquid substance which is formed up of hydrogen and oxygen molecules.
When two hydrogen atom combine with one oxygen atom then it form a molecule of water.    
When water is in liquid state, the molecules of water have much kinetic energy due to which they remain moving here and there. 
Their molecules sliding over others, due which the space between molecules of water is very less. 
And as the space is less, so the density is much. But when the temperature of water goes down,  
then the kinetic energy of molecules also goes down and when temperature goes below 4℃,
then the kinetic energy of the molecules becomes so less. At that time ice molecules have not  
enough kinetic energy to break the bond and move freely. you seen what type of bond does ice molecules have? The structure of the bond is given in the figure below.


 Image.1: Molecular structure of ice.
Water have oxygen and hydrogen atom which forms a hexagonal structure that contains lots of space between them. And due to these spaces ice have less density than water that's why ice float on water. 

Conclusion: 
This phenomenon is occurred because as I described you above that ice molecules have a hexagonal structure which contains much of space in comparison to water molecules. That's why 1 kg of ice have much volume than 1 kg of water.

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गुगल फॉर्म च्या माध्यमातून Quiz तयार करणे




१. सर्वप्रथम क्रोम ब्राऊझर वर जाऊन Google forms टाईप करावे.


२. गुगल फॉर्म ओपन होईल , go to Google form त्यावर जाऊन + या ऑप्शन वरून नवीन गुगल फॉर्म ओपन करावा.


३. गुगल फॉर्मवर क्विझ तयार करावयाची असल्यामुळे फार्म ओपन होताच फॉर्मच्या सेटिंग मध्ये जावे तेथे 3 विंडो असतील . त्यामध्ये पहिली जनरल , दुसरी प्रेझेंटेशन आणि तिसरी क्विझची असेल. क्विझ वर क्लिक करा .


४. Make this quiz हे ऑप्शन ऑन करा व सर्वात खाली जाऊन सेव्ह करून घ्या . आपण क्विझ तयार करण्याच्या दिशेने पहिले पाऊल टाकलेले आहे.


५. जो untitle form आलेला आहे त्याला नाव द्या व डिस्क्रिप्शन मध्ये कोणत्या वर्गाची , कोणत्या धड्यावर आधारित क्विझ आहे ते टाकायला विसरू नका .


६. किमान दहा प्रश्न क्विझ मध्ये असणे अनिवार्य आहे त्यासाठी प्रश्नाचे जे ऑप्शन दिलेले आहेत त्यापैकी मल्टिपल चॉइस ,  ड्रॉप-डाऊन , चेक बॉक्स किंवा शॉर्ट आन्सर घेतल्यास उत्तम .


७. मल्टिपल चॉइस घेतल्यास उत्तरा दाखल कमाल चार पर्याय निवडणे गरजेचे आहे .


८. प्रत्येक प्रश्नाच्या खाली आन्सर की असे लिहिलेले आहे त्यावर क्लिक करून बरोबर उत्तर निवडायची आहे तसेच उजव्या बाजूला पॉईंट्स लिहिलेले आहे तिथे त्या प्रश्नाचे गुण द्यायचे आहेत.


९. डाव्याबाजूला आंसर फीडबॅक असे लिहिलेले आहे त्यावर क्लिक करा ,  करेक्ट आन्सर लिहिलेले असेल ते निवडून आपला फीडबॅक आपण नोंदवू शकतो . म्हणजे विद्यार्थ्यांचे उत्तर जेव्हा बरोबर येईल तेव्हा आपण नोंदविलेला फीडबॅक त्यांना दिसेल .


१०. त्यानंतर ही क्विझ सेंड करायची आहे . त्यानंतर आलेली लिंक शॉर्ट करून कॉपी करायची आहे व व्हाट्सअप वर या भागाशी संबंधित एक पोस्ट तयार करून आपल्याला आपआपल्या गृप वर सेंड करायची असते.


११. रिस्पाॅसेस मध्ये जाऊन आपण विद्यार्थ्यांची उत्तरे पाहू शकतो.




©️ ही पोस्ट माझ्या शिक्षक बांधवांना  क्विझ तयार करण्यासाठी मदत व्हावी म्हणून तयार करण्यात आलेली आहे , कृपया फॉरवर्ड करताना ही जशीच्यातशी फॉरवर्ड करावी


शेख मुजीब युसूफ 

*Gangakhed*


       बारावी तथा विज्ञान शाखेतील विद्यार्थ्यांसाठी अत्यंत उपयुक्त असे व्हिडिओज
 IIT-PAL YouTube या चैनल वर. (स्वयंप्रभा चॅनेल द्वारे आपण नेहमी पाहत असतो). 
  शक्यतो सर्व विद्यार्थ्यांना पाठवणे अत्यंत महत्त्वाचे.
These are the TV channels you need to switch on for your subject to watch IIT-PAL video lectures: Send  by
Channel 19: IIT PAL: Biology.
Channel 20: IIT PAL: Chemistry.
Channel 21: IIT PAL: Mathematics.
Channel 22: IIT PAL: Physics.