The word Araghatta has been used in the ancient texts to describe the Persian Wheel. The ‘ara-ghatta’ comes from the combination of the words ‘ara’ meaning spoke and ‘ghatta’ meaning pot. It is used to lift water from water sources typically open wells.

The first volume dealt with Akbar’s ancestors and the second volume recorded the events of Akbar’s reign. The third volume is the Ain-I Akbari. It deals with Akbar’s administration, household, army, the revenues and geography of his empire.
It also provides rich details about the traditions and culture of the people living in India. The most interesting aspect about the Ain-i Akbari is its rich statistical details about things as diverse as crops, yields, prices, wages and revenues

1 and 2 are correct.
The Portuguese, the first Europeans to come to India, were also the last to leave this land. It was 1961 before the Government of India recaptured Goa, Daman and Diu from them.
The Portuguese discovery of the sea route to India was the first recorded trip made directly from Europe to India via the Cape of Good Hope, in the Atlantic Ocean. It was undertaken under the command of Portuguese explorer Vasco da Gama during the reign of King Manuel I in 1495–1499. The Portuguese brought with them the same zeal to promote Christianity and the wish to persecute all Muslims.
Intolerant towards the Muslims, the Portuguese were initially quite tolerant towards the Hindus. However, over time, after the introduction of the Inquisition in Goa, there was a change and Hindus were also persecuted.

Bahishkrit Hitakarini Sabha is a central institution formed by Dr. Babasaheb Ambedkar for removing difficulties of the untouchables and placing their grievances before government. In order to bring about a new socio-political awareness among the untouchables, Dr.Babasaheb Ambedkar established “Bahishkrit Hitkarini Sabaha” on 20 July 1924 at Bombay.
Babu Jagjivan Ram played a role in the founding (1935) of the All-India Depressed Classes League, an organization dedicated to attaining equality for Dalits.
Harijan Sevak Sangh is a non-profit organisation founded by Mahatma Gandhi in 1932 to eradicate untouchability in India, working for Harijan or Dalit people and upliftment of scheduled castes of India.

Savitribai Phule, the social reformer who is considered to be one of India’s first modern feminists, was born on January 3, 1831. Among her accomplishments, she is especially remembered for being India’s first female teacher who worked for the upliftment of women and untouchables in the field of education and literacy.
Phule was born in Naigaon, Maharashtra in 1831 and married activist and social-reformer Jyotirao Phule when she was nine years old. After marriage, with her husband’s support, Phule learned to read and write and both of them eventually went on to found India’s first school for girls called Bhide Wada in Pune in 1948. Before this, she started a school with Jyotirao’s cousin Saganbai in Maharwada in 1847.
Essentially, both Jyotirao and Savitribai Phule recognised that education was one of the central planks through which women and the depressed classes could become empowered and hope to stand on an equal footing with the rest of the society.