The Aryabhata spacecraft, named after the famous Indian astronomer, was India's first satellite; it was completely designed and fabricated in India and launched by a Soviet Kosmos-3M rocket from Kapustin Yar on April 19, 1975.

A. H. Taylor and Leo C. Young were American scientists who played a crucial role in the development of radar technology. They are credited with creating the first radar system in the United States. Radar, which stands for "Radio Detection and Ranging," is a technology that uses radio waves to detect and locate objects. It became essential during World War II for various applications, including aircraft detection and navigation. The work of Taylor and Young contributed significantly to the advancement of radar technology and its subsequent widespread use in military and civilian applications.

A. National census does not identify ethnic groups within India.

B. Here are examples of some specific groups identified by the national census.

1. Tribal Groups: Santhal, Gond, Adivasi, Bodo, Meena, Kushwaha

2. Religious Groups: Hindu, Muslim, Christian, Sikh, Buddhist, Jain, Parsi

3. Linguistic Groups: Hindi, Bengali, Marathi, Tamil, Telugu, Urdu, Gujarati, Kannada, Punjabi, Assamese

Pokhran is a city and a municipality located in Jaisalmer district in the Indian State of Rajasthan. It is a remote location in the Thar desert region and served as the test site for India’s first underground nuclear weapon detonation.

It shot into the international limelight on 7th September 1974, when the then Indian Prime Minister Indira Gandhi verbally authorised scientists at the Bhabha Atomic Research Centre (BARC) at Trombay to detonate small and miniaturised nuclear device. Throughout its development, the device was formally called the Peaceful Nuclear Explosive (PNE) by Indian Government, but it was usually referred to as the Operation ‘Smiling Buddha’. On 11th May of 1998, 24th year after the first operation, the Atomic Energy Commission of India and the Defence Research and Development Organisation (DRDO) carried out the joint operation, known as Pokhran-ll. The AEC India detonated its four devices as part of the underground nuclear testing on Pokhran Test Range.