On 13 April 1919, the Jallianwala Bagh massacre took place in Amritsar. General Dyer fired indiscriminately on a public meeting to protest the arrest of Dr Satpal and Saifuddin Kichlu. According to the government report, 379 people were killed and according to the Congress Committee, about 1000 people were killed. Shankaran Nair resigned from Viceroy's Executive Council membership in protest of the Jallianwala Bagh massacre. In protest against the Jallianwala Bagh massacre, Mahatma Gandhi returned the title of 'Kaiser a-Hind', Jamnalal Bajaj the title of 'Rai Bahadur' and Ravindra Nath Tagore the title of 'Sir'.

The Harappans cultivated wheat and barley, peas and dates and also sesame and mustard which were used for oil. However, the people cultivated rice as early as 1,800 BC in Lothal.

* Rakhigarhi, estimated to be the largest Harappan civilization site located in Hisar district of Haryana. This early Harappan settlement, considered bigger than Mohenjodaro, was listed among the 10 most endangered heritage sites in Asia.

* The Indus cities are noted for their urban planning, baked brick houses, elaborate drainage systems, water supply systems, and clusters of large non-residential buildings.

* Harappans had the best drainage system installed. They had very fine civic sense. So, statement B is wrong and thus, this is the correct answer.

Magnetite is a rock mineral and one of the main iron ores, with the chemical formula Fe3O4. It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself.It is the most magnetic of all the naturally-occurring minerals on Earth.

A population pyramid, also called an "age-gender-pyramid", is a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which forms the shape of a pyramid when the population is growing.Males are conventionally shown on the left and females on the right, and they may be measured by raw number or as a percentage of the total population.

• 12th Constitutional Amendment Act, 1962: Goa, Daman and Diu incorporated in the Indian Union as a Union Territory.

• 7th Constitutional Amendment Act of 1956 facilitated the appointment of the same person as a governor for two or more states.

• 13th Constitutional Amendment Act, 1962: Nagaland was formed with special status under Article 371A.

• Citric acid is a weak organic acid with the formula C₆H₈O₇.
• The juice of the lemon is about 5% to 6% citric acid, which gives a sour taste.

• Charcoal is a light, black residue, consisting of carbon and any remaining ash, obtained by removing water and other volatile constituents from animal and vegetation substances.
• It is used in water treatment as an adsorbent.

● Disinflation is used to describe the slowing of price inflation.

● In other words, it is a decrease in the rate of inflation in a specific period.

Repo rate: The rate of interest at which commercial banks obtain a cash loan from the Reserve Bank for meeting short-term requirements is called 'repo rate'.

Bank Rate: The common interest rate at which money is lent by Reserve Bank to commercial banks is called 'Bank Rate'. Credit control is done by the Reserve Bank through this.

Reverse Repo Rate: The rate of interest at which cash is received by the Reserve Bank from commercial banks for a short term is called 'Reverse Repo Rate'.

Savings Bank Rate: The rate of interest offered by a bank on small savings of bank customers is called 'Savings Bank Rate'.