Sound Waves are longitudinal mechanical waves. Sound waves are of two types: Longitudinal waves and Mechanical.

India shares about 3488 km of border with the Republic of China. Indian states Jammu and Kashmir, Himachal Pradesh, Sikkim, Uttarakhand, and Arunachal Pradesh share their border with the Republic of China.

Santosh Trophy is associated with the football while all given trophies are related to cricket. Santosh Trophy is an Indian football tournament in which the states of the country along with some government institutions participate. This is held annually since 1941. Bengal was the first winner of the competition held in 1941. The trophy is named after the late Maharaja Sir Manmatha Nath Roy Chowdhary of Santosh, now in Bangladesh.

The classical dance Kathak is originated from Uttar Pradesh in north India. This dance is derived from the word ‘Katha’ meaning story, and during the whole dance, the dancers narrate stories through their eyes and expressions.

Sultan Firoz Shah Tughlaq was a Muslim ruler of the Tughlaq dynasty. He reigned over the Sultanate of Delhi from 1351 to 1388. He succeeded his cousin Muhammad bin Tughlaq following the latter's death at Thatta in Sindh, Gujarat.

Prime Minister Narendra Modi launched the 'Har Ghar Nal Yojana' (Tap Water to Every Household) for the residents of Uttar Pradesh's Sonbhadra and Mirzapur district on November 22.

The International Day of Non-Violence is observed on 2 October, the birthday of Mahatma Gandhi. Non-Violence is the personal practice of being harmless to oneself and others under every condition.

New Delhi has been adjudged as the world's most polluted capital city for the third straight year in the 2020 World Air Quality Report by Swiss organisations, IQAir. Globally, New Delhi is ranked as the 10th most polluted city in the world.

* Tirath Singh Rawat from BJP’s member of Parliament from Pauri Garhwal, will be the next chief minister of Uttarakhand (9^th CM).

* Unicellular algae, protozoa, and unicellular fungi are included under Protista world according to the classification of Margulis and Schwartz of 1982.

* They are autotrophic (e.g., unicellular fungi, diatom) or heterotrophic (e.g., protozoa).

* Unicellular fungi, Amoeba, Paramecium, Chlamydomonas (Chlamydomonas), Chlorella, Euglina, Trypanosoma (the cause of sleeping sickness), Plasmodium, etc., are examples of this category.