Who was the first chairman of ISRO?
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Japan is called the 'Land of the rising sun' because
How many languages are officially recognized in India?
Which of the following glows with special colour depending on the nature of gas in the fluorescent tube?
__________ is the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration.
During the past century, the temperature of Earth has increased by ________.
Which of the following is not a commercial source of energy?
A level of atmosphere which is composed partly of electrons and positive ions is called