✅ Samaveda (the Veda of Melodies) primarily deals with music, chanting, and rituals. Rigveda contains hymns; Yajurveda has sacrificial formulas; Atharvaveda contains spells and charms. The origins of Indian music are traced to the Samaveda.

✅ The Ajanta Caves paintings (Maharashtra) depict Jataka Tales — stories of the previous lives of Lord Buddha. They date from the 2nd century BCE to 6th century CE. These caves were rediscovered by British officer John Smith in 1819. They are a UNESCO World Heritage Site.

✅ The monolithic rock-cut temples (Rathas) and Seven Pagodas at Mahabalipuram (Tamil Nadu) were built under the patronage of the Pallava dynasty (particularly Narasimhavarman I and his successors). They are UNESCO World Heritage Sites.

✅ The Taj Mahal was built by Shah Jahan (r. 1628–1658) in memory of his beloved wife Mumtaz Mahal, who died in 1631. It is located in Agra, Uttar Pradesh, on the banks of the Yamuna. It was completed around 1653 and is a UNESCO World Heritage Site.

✅ Raja Todar Mal was Akbar’s Finance Minister who reformed the revenue system (Zabti/Ain-i-Dahsala). He measured agricultural land and fixed revenue based on soil quality. Abul Fazl wrote the Ain-i-Akbari and Akbarnama. Akbar introduced the Mansabdari system himself as an administrative-military rank system.

✅ The Ghadar Party was founded in 1913 by Lala Hardayal and was headquartered at San Francisco, USA. It was primarily composed of Indian immigrants, especially Punjabis, in North America. The party aimed to overthrow British rule through armed rebellion.

✅ The Partition of Bengal was announced by Lord Curzon in 1905 and reversed in 1911 during the Delhi Durbar, when King George V and Queen Mary visited India. The massive Swadeshi movement, boycott of British goods, and protests led to the annulment. The capital was also shifted from Calcutta to Delhi in 1911.

✅ Raja Ram Mohan Roy founded the Brahmo Samaj in Calcutta on 20 August 1828. It was a major socio-religious reform movement that opposed idol worship, sati, child marriage and casteism. He is called the “Father of Modern India” and “Father of the Indian Renaissance.”

✅ “Jana Gana Mana” was composed by Rabindranath Tagore in Bengali. It was first sung on 27 December 1911 at the Calcutta session of the Indian National Congress. It was adopted as the National Anthem on 24 January 1950. Bankim Chandra Chattopadhyay composed “Vande Mataram” (National Song).

✅ The Simon Commission (1927) was boycotted by all Indian political parties because it had no Indian member — all seven members were British. It was appointed to review the working of the Government of India Act 1919. Indians greeted it with “Simon Go Back” slogans. Lala Lajpat Rai was beaten by police during protests and later died.

✅ The Non-Cooperation Movement was launched by Gandhi in 1920, partly triggered by the Jallianwala Bagh Massacre (April 13, 1919) and the Khilafat issue. It involved boycott of government institutions, return of titles, and non-payment of taxes. It was called off after the Chauri Chaura incident (1922).

✅ Jawaharlal Nehru was born on 14 November 1889 in Allahabad (now Prayagraj), Uttar Pradesh. He served as India’s first PM from 1947 to 1964. His birthday is celebrated as Children’s Day (Bal Diwas). His family home “Anand Bhawan” in Allahabad is now a national museum.

✅ Under Article 79 of the Indian Constitution, the Parliament of India consists of three parts: the President, the Council of States (Rajya Sabha), and the House of the People (Lok Sabha). The President is an integral part of Parliament, though not a sitting member of either House.

✅ The Indian Constitution (Article 85) requires Parliament to meet at least twice a year and the gap between two consecutive sessions should not exceed six months. Parliament has three sessions: Budget Session (Feb–May), Monsoon Session (Jul–Aug), and Winter Session (Nov–Dec).

✅ The Speaker of Lok Sabha presides over the joint sitting of both Houses of Parliament (Article 108). Joint sessions are called to resolve a deadlock on ordinary bills between the two Houses. The first joint sitting was held in 1961 (Dowry Prohibition Bill); the second in 1978 (Banking Service Commission Repeal Bill).

✅ A Money Bill can be introduced only in the Lok Sabha (Article 110). After passing in Lok Sabha, it is sent to Rajya Sabha, which must return it within 14 days with recommendations. Lok Sabha may or may not accept the recommendations. The Speaker of Lok Sabha certifies whether a Bill is a Money Bill.

✅ Judges of the Supreme Court of India retire at the age of 65 years (Article 124). Judges of High Courts retire at 62 years. A Supreme Court judge can be removed only by impeachment — a process involving two-thirds majority in both Houses. The first CJI of India was Justice H.J. Kania.

✅ The Basic Structure Doctrine was established in the landmark Keshavananda Bharati vs. State of Kerala (1973) case by a 13-judge bench. It held that while Parliament can amend the Constitution, it cannot alter its basic structure (like federalism, democracy, fundamental rights, judicial review). Justice Hans Raj Khanna was its main proponent.

✅ Zero Hour refers to the time between the end of Question Hour and beginning of regular business — i.e., from 12 Noon to 1 PM. It starts at zero hour and has no fixed time limit. Zero Hour is an Indian Parliamentary innovation not found in the constitutions of other democracies. Members can raise urgent public matters without prior notice.

✅ The 44th Constitutional Amendment (1978) deleted Article 31 (Right to Property) from Part III (Fundamental Rights) and made it a legal right under Article 300A. It was passed by the Janata Party government under Morarji Desai. Property can no longer be claimed as a fundamental right.

✅ Sukumar Sen was the first Chief Election Commissioner of India (1950–1958). He successfully conducted India’s first two General Elections in 1951-52 and 1957. T.N. Seshan (CEC 1990–96) is known for transforming the Election Commission into a powerful institution.

✅ The Finance Commission (Article 280) is appointed by the President every 5 years. It recommends the distribution of central tax revenues between the Centre and States. The 16th Finance Commission (Chairman: Arvind Panagariya) is currently functional (2024-2029).

✅ Article 51A contains the Fundamental Duties of Indian citizens. Originally there were 10 duties, added by the 42nd Amendment (1976) on the recommendation of the Swaran Singh Committee. An 11th duty (to provide opportunities for education to children between 6-14 years) was added by the 86th Amendment (2002).

✅ Judicial Review in India is based on “Procedure Established by Law” (Article 21) — adopted from the Japanese Constitution. The USA uses “Due Process of Law.” The Supreme Court can declare any law void if it violates the Constitution (Article 13). India adopted judicial review from the USA’s constitutional framework.

✅ Rajasthan is the largest state in India by area (342,239 sq km), forming about 10.4% of India’s total area. It is known for the Thar Desert, Jaisalmer Fort, and the Aravalli range. Uttar Pradesh has the largest population. Goa is the smallest state by area.

✅ The Sundarbans is the world’s largest mangrove delta, shared between India (West Bengal) and Bangladesh. It is the home of the Royal Bengal Tiger and the Gangetic river dolphin. It is a UNESCO World Heritage Site and a Ramsar Convention wetland. “Sundarban” means “Beautiful Forest.”

✅ The Cauvery water dispute involves Karnataka, Tamil Nadu, Kerala, and Puducherry. The Cauvery Water Disputes Tribunal (set up 1990) gave its final award in 2007. The river originates in Coorg (Kodagu), Karnataka and flows into the Bay of Bengal. It is called “Dakshina Ganga” (Ganga of the South).

✅ Majuli in the Brahmaputra River, Assam, is the world’s largest river island (area ~880 sq km). It is known as a centre of Vaishnavite culture and the neo-Vaishnavite monasteries (Satras) founded by Srimanta Sankardeva. It became India’s first island district in 2016.

✅ The Teesta River originates from Tso Lhamo Lake in Sikkim. It flows through Sikkim and West Bengal (passing through Siliguri) before joining the Jamuna (Brahmaputra) river in Bangladesh. The Teesta water sharing is a major bilateral issue between India and Bangladesh.

✅ India’s Standard Meridian is 82.5°E longitude, passing through Mirzapur (Naini), Uttar Pradesh. India’s Standard Time (IST) is UTC +5:30 hours. India has a single time zone unlike countries like USA or Russia. The Tropic of Cancer (23.5°N) and the Standard Meridian meet near Jabalpur, MP.

✅ Kaziranga National Park is in the Golaghat and Nagaon districts of Assam. It hosts two-thirds of the world’s Indian One-Horned Rhinoceros population. It was declared a UNESCO World Heritage Site in 1985. It is also home to tigers, elephants, wild water buffaloes, and swamp deer.

✅ Digboi Refinery in Assam is the oldest oil refinery in India, established in 1901. Oil was first discovered in Digboi in 1889. It is operated by Indian Oil Corporation (IOC). Digboi was also the site of the first oil well drilled in Asia. It has a unique distinction in global oil history.

✅ The speed of light in vacuum is approximately 3 × 10⁸ m/s (3,00,000 km/s). This is denoted as ‘c’ in physics and was established by James Clerk Maxwell. Nothing in the universe can travel faster than light (Einstein’s Theory of Special Relativity). Light takes ~8 minutes 20 seconds to reach Earth from the Sun.

✅ The Skin is the largest organ of the human body by area (~2 m²) and weight (~3.5–5 kg). It acts as a protective barrier, regulates temperature, and contains sensory receptors. The liver is the largest internal solid organ. The small intestine is the longest organ (~6–7 metres).

✅ Common salt (table salt) is chemically Sodium Chloride (NaCl). Sodium Carbonate (Na₂CO₃) = Washing Soda; Sodium Bicarbonate (NaHCO₃) = Baking Soda; Sodium Hydroxide (NaOH) = Caustic Soda. Salt is essential for human life and is used extensively in food, industry and medicine.

✅ Insulin is secreted by the beta cells of the Islets of Langerhans in the Pancreas. It regulates blood glucose levels. Its deficiency causes diabetes mellitus. Insulin was discovered by Frederick Banting and Charles Best in 1921. Glucagon (also from pancreas) increases blood sugar, opposing insulin.

✅ The Binary Number System (Base-2) uses only two digits: 0 and 1. All data in computers is stored and processed as binary (bits). Octal uses 0-7 (base 8); Decimal uses 0-9 (base 10); Hexadecimal uses 0-9 and A-F (base 16). 1 Byte = 8 bits; 1 Kilobyte = 1024 Bytes.

✅ Ctrl + S saves a file in Microsoft Word and most applications. Ctrl + N = New file; Ctrl + P = Print; Ctrl + O = Open; Ctrl + Z = Undo; Ctrl + Y = Redo; Ctrl + A = Select All; Ctrl + B = Bold; Ctrl + U = Underline; Ctrl + I = Italic; F12 = Save As.

✅ GST (Goods and Services Tax) was implemented in India on 1 July 2017 at midnight. It replaced multiple indirect taxes and is described as “One Nation, One Tax.” The GST Council is chaired by the Union Finance Minister. GST has 4 tax slabs: 5%, 12%, 18%, and 28%.

✅ The National Statistical Office (NSO), formerly Central Statistical Organisation (CSO), under the Ministry of Statistics and Programme Implementation, measures National Income of India. The RBI is India’s central bank. SEBI regulates capital markets. NITI Aayog replaced Planning Commission in 2015.

✅ The Chipko Movement (1973) started in Uttarakhand (then UP Hills) to protect forests by hugging trees to prevent them from being felled. Sundarlal Bahuguna and Chandi Prasad Bhatt were key leaders. Gaura Devi of Reni village was an early pioneer. “Chipko” means “to hug/cling to” in Hindi.

✅ The Montreal Protocol (1987) is an international treaty to phase out substances (CFCs, HCFCs) that deplete the Ozone Layer. It is one of the most successful environmental treaties. The ozone layer absorbs harmful UV radiation. The Kyoto Protocol deals with greenhouse gas emissions. CBD (Rio 1992) deals with biodiversity.

✅ India’s first satellite, Aryabhata, was launched on 19 April 1975 using a Soviet Kosmos-3M rocket from Kapustin Yar. It was named after the ancient Indian mathematician/astronomer. Rohini (1980) was the first satellite launched by India’s own rocket (SLV-3). ISRO was established in 1969.

✅ Dr. Vikram Sarabhai is the Father of the Indian Space Programme. He established ISRO (Indian Space Research Organisation) and the Physical Research Laboratory (PRL). Homi Bhabha is the Father of the Indian Nuclear Programme. A.P.J. Abdul Kalam is the Father of India’s Missile Programme (Agni, Prithvi).

✅ Durga Puja in Kolkata was inscribed on the UNESCO Representative List of Intangible Cultural Heritage of Humanity in December 2021. It is the biggest festival of West Bengal and is celebrated with grand pandals and cultural events. The festival is a 5-day celebration culminating on Vijaya Dashami (Dussehra).

✅ The Fishing Cat (Prionailurus viverrinus) is the state animal of West Bengal. The state bird is White-throated Kingfisher; the state flower is Night Jasmine (Shiuli). The state tree is Chatim. The Royal Bengal Tiger is the national animal of both India and Bangladesh.

✅ The first Cricket World Cup (ODI) was held in England in 1975. West Indies won the first two World Cups (1975 and 1979). India won its first World Cup in 1983 (captained by Kapil Dev) by defeating West Indies in the final at Lord’s. India won again in 2011 (under M.S. Dhoni) and 2024 (T20, under Rohit Sharma).

✅ The Major Dhyan Chand Khel Ratna Award (earlier Rajiv Gandhi Khel Ratna, renamed in 2021) is the highest sporting honour in India. The Arjuna Award is given for outstanding sports performance over 4 years. Dronacharya Award is for coaches. Dhyan Chand Award is for lifetime contribution to sports.

✅ India’s Chandrayaan-3 mission successfully soft-landed near the Moon’s South Pole on 23 August 2023, making India the first country to achieve this feat. The lander was named Vikram and the rover Pragyan. India became the 4th country to land on the Moon (after USA, Russia, China). 23 August is now celebrated as National Space Day.

✅ The Gangetic River Dolphin (Platanista gangetica) is India’s National Aquatic Animal. It is also called the “Tiger of the Ganges” and is found in the Ganga-Brahmaputra-Meghna river system. It is blind and navigates using echolocation. It is a Schedule I species under the Wildlife Protection Act, 1972. India’s national symbols: Tiger (animal), Peacock (bird), Lotus (flower), Mango (fruit), Banyan (tree), Ganges (river).