01- Sound waves are called as follow-up waves and mechanical waves.


02- Man can listen to sound waves from 20 Hz to 20,000 Hz.


03- Jawaharlal Nehru wrote Glimpsem of World History, Discovery of India and an Autobiography.


04 – Lala Lajpat Ras was injured in opposing the Simon Commission, which led to her death.


05- Partition of Bengal happened in 1905. The announcement was made on 04 July, but it was implemented on October 16.


06- India’s first full indigenous original film was Raja Harishchandra.


07- Sulfur dioxide and nitrogen dioxide gas are responsible for acid rain.


08- Atlantic Ocean is the second and the third largest Indian ocean in the ocean.


09- Average salinity in seawater is found in 34 to 35 per thousand.


10- The rise of jowar bhaat is due to the gravitational power of the sun and the moon.


11- Oceanic current is the flow of ocean water in a certain direction.


12- Gangotri has originated from Ganga river.


13- Yamuna is the main river of river Ganges.


14- Betwa, Kane and Chambal River is the tributary of river Yamuna.


15- Narmada river originates from Amarkantak.


16- The Tapti River originates from Multai district Betul Madhya Pradesh.


17- Vinegar contains 4 percent to 8 percent acetic acid.


18- India’s first National Park is the Carbet National Park.


19- The rate of work is called power.


20- The value of the escape velocity on the Moon is 1.9 K / S.