International Mother Language Day is observed on

The correct answer is A, 23 April. UNESCO fixed this date because it carries unusual literary weight: Miguel de Cervantes, the author of Don Quixote, died on 23 April 1616, and the same date is traditionally given for the death of William Shakespeare. The day is used to promote reading and publishing and to draw attention to the protection of copyright. Option B, 18 April, is World Heritage Day, formally the International Day for Monuments and Sites, and the closeness of the two April dates is exactly what makes this question worth setting. Option C, 21 March, is World Poetry Day, adopted by UNESCO in 1999, which belongs to the same literary family but is a distinct observance. Option D, 8 September, is International Literacy Day, observed since 1967 to press for universal reading and writing, and although it concerns books and learning it is a separate day with a separate purpose.

The correct answer is B, 27 March. World Theatre Day was instituted in 1961 by the International Theatre Institute, and every year a figure from world theatre delivers an international message that is read out in theatres across many countries. Option A, 29 April, is International Dance Day, also declared by the International Theatre Institute, chosen because it is the birth anniversary of Jean-Georges Noverre, the French dancer who reformed ballet; theatre and dance days thus come from the same body but fall on different dates. Option C, 18 May, is International Museum Day, declared by the International Council of Museums. Option D, 21 November, is World Television Day, declared by the United Nations after the first World Television Forum of 1996. The performing-arts cluster worth fixing is 27 March for theatre, 29 April for dance and 30 April for jazz.

The correct answer is A, Jean-Georges Noverre. Noverre was the French dancer and choreographer who argued that ballet should tell a story through expressive movement rather than remain a display of steps, and the International Theatre Institute chose his birthday, 29 April, for International Dance Day. Option B, Leonardo da Vinci, has his birthday on 15 April, which is World Art Day, so the person is real and the day is the wrong one. Option C, Pierre de Coubertin, founded the modern Olympic movement, and the date linked to him is 23 June, the day the International Olympic Committee was established in 1894, not a dance anniversary. Option D, Rukmini Devi Arundale, revived Bharatanatyam and founded Kalakshetra, and she is a plausible choice for a dance day but International Dance Day is an international observance tied to Noverre. The rule to carry away is that each of these dates is a birthday or a founding day.

The correct answer is B, 18 May. International Museum Day was declared by the International Council of Museums, and on it museums across the world open to the public around a common annual theme meant to show the part museums play in education and in society. Option A, 18 April, is World Heritage Day, formally the International Day for Monuments and Sites, which was proposed by the International Council on Monuments and Sites and approved by UNESCO in 1983; because both dates are the eighteenth, this is the pair most often exchanged in question papers, and it is worth remembering that the heritage day comes first in the year. Option C, 21 May, is the World Day for Cultural Diversity for Dialogue and Development. Option D, 27 September, is World Tourism Day, which marks the anniversary of the adoption of the statutes of the World Tourism Organization in 1970.

The correct answer is B, 18 April. The day was proposed by the International Council on Monuments and Sites and approved by UNESCO in 1983, and it is used to draw public attention to the conservation of historic buildings, archaeological sites and cultural landscapes, including the sites on the World Heritage List. Option A, 18 May, is International Museum Day, and since both dates are the eighteenth of a month they are the standard trap for each other. Option C, 23 April, is World Book and Copyright Day, which falls in the same month and honours the death of Cervantes. Option D, 15 April, is World Art Day, chosen because it is the birth anniversary of Leonardo da Vinci. April is therefore a crowded month in this topic, carrying the art day on the fifteenth, the heritage day on the eighteenth, the book day on the twenty-third and the dance day on the twenty-ninth, and that sequence is worth learning as a block.