Important National and International Days

Indira Gandhi was assassinated on 31 October 1984 by her bodyguards Satwant Singh and Beant Singh at her residence in New Delhi. This led to the 1984 anti-Sikh riots. 23 and 25 March are associated with Bhagat Singh and other events, while 30 October is the day before.

Lala Lajpat Rai died on 17 November 1928 from injuries sustained during a lathi charge by British police led by Superintendent James Scott. He was part of the Lal-Bal-Pal trio and his death led to the assassination of Scott by Bhagat Singh and associates. 15 and 16 November are close but incorrect.

Dr. B.R. Ambedkar died on 6 December 1956 at his home in Delhi. He was the chief architect of the Indian Constitution and champion of social justice, also known as Babasaheb. 7 December is close but incorrect, while 4 and 5 December have no connection.

Sardar Vallabhbhai Patel died on 15 December 1950 in Mumbai. He was India's first Home Minister and is known as the 'Iron Man of India' for integrating princely states. 4, 5, and 6 December are close dates associated with Ambedkar but incorrect for Patel.

Sri Aurobindo (Arvind Ghosh) died on 5 December 1950 in Pondicherry. He was a philosopher, yogi, and nationalist who later founded the Sri Aurobindo Ashram. 28 December is close but incorrect, 29 December has no significance, and 15 December is Sardar Patel's death anniversary.

Earth Day was first celebrated on April 22, 1970, when Senator Gaylord Nelson from Wisconsin organized it as a national teach-in about environmental issues. This date has been observed annually worldwide since then. The event marked the beginning of the modern environmental movement.

Earth Day is indeed celebrated across the world (April 22) to inspire awareness and appreciation for our planet's environment. Despite the spelling errors in the question ('accross' instead of 'across,' 'approciation' instead of 'appreciation'), the factual statement is true.

Ecuador celebrates its Independence Day on August 10th, commemorating the first call for independence from Spain in 1809 in Quito. This date marks the start of the independence movement, though full independence was achieved later in 1822.

Mother's Day is celebrated on the second Sunday of May in many countries including India and the United States. The other options list different months which are incorrect for the standard observance.

World Hemophilia Day is observed annually on April 17, chosen to honor the birthday of Frank Schnabel, founder of the World Federation of Hemophilia. The date raises awareness about bleeding disorders. Options A, C, and D are incorrect.

Queen Elizabeth II attended the Wimbledon Championships on Thursday 24 June 2010, her first visit to the tournament since 1962. The other dates do not match her confirmed attendance.

The Nobel Prize is awarded annually on December 10, the anniversary of Alfred Nobel's death. This ceremony takes place in Stockholm, Sweden (for most prizes) and Oslo, Norway (for the Peace Prize). The other dates are unrelated to Nobel Prize history.

The question refers to 'Dhruvataare' (Dhruv Nakshatra or the Pole Star), which is a Kannada-language newspaper that ceased publication. The newspaper closed on April 12, 2006, which was a significant event in Kannada journalism.

The Saka Era (Saka Samvat) calendar is indeed one of India's national calendars, used for official government purposes alongside the Gregorian calendar. The calendar starts from 78 AD when the Saka era began.

Chile celebrates its Independence Day on September 18th, commemorating the beginning of the independence process in 1810. July 4th is American Independence, August 15th is associated with several countries (India, South Korea), and December 20th is not a major independence day.