21 September is observed as –

A. World day for War Orphans
B. United Nations Day for South-South Cooperation
C. Labour Day
D. World Alzheimer’s Day
✅ The correct answer is option D.
World Alzheimer’s Day is observed on 21 September to raise awareness among people about the challenges that the patient faces due to dementia. In 2012, World Alzheimer’s Month was launched.

5 October is celebrated as –

A. World Radio Day
B. International Teachers’ Day
C. Thinking Day
D. World Consumer Rights Day
✅ The correct answer is option B.
World Teachers’ Day is celebrated on 5 October every year in the whole world to commemorate the anniversary of the adoption of the ILO/UNESCO Recommendation concerning the Status of Teachers in 1966.

6 February is observed as –

A. World Cancer Day
B. United Nations Day for South-South Cooperation
C. World telecommunication day
D. International Day of Zero Tolerance to Female Genital Mutilation
✅ The correct answer is option D.
International Day of Zero Tolerance for Female Genital Mutilation is a United Nations sponsored annual awareness day that takes place on 6 February as part of the UN’s efforts to eradicate female genital mutilation. It was first introduced in 2003.

22 March is celebrated as –

A. World Hemophilia Day
B. International Water Day
C. World Earth Day
D. World Book Day
✅ The correct answer is option B.
World Water Day, held on 22 March every year since 1993, focuses on the importance of freshwater. World Water Day celebrates water and raises awareness of the 2.2 billion people living without access to safe water.

World Population Day is observed on –

A. 11 July
B. 8 May
C. 5 June
D. 16 October
✅ The correct answer is option A.
World Population Day is an annual event, observed on 11 July every year, which seeks to raise awareness of global population issues. The event was established by the Governing Council of the United Nations Development Programme in 1989.