1. How many satellites did ISRO launch using its PSLV-C51 rocket?

India's Polar Satellite Launch Vehicle-C51 (PSLV-C51) rocket was successfully launched from Sriharikota Launch Pad. It launched 19 satellites from Brazil, the United States and India, including Amazonia 1, a 637-kg optical earth observation satellite from Brazil as the primary passenger. This is the first commercial mission of New Space India Limited.

2. National Science Day is celebrated in India for the discovery of which scientist?

National Science Day is celebrated in India every year on 28 February to commemorate the discovery of 'Raman Effect'. On the same day, CV Raman announced the discovery of the 'Raman effect' and was awarded the Nobel Prize in 1930. The theme of National Science Day 2021 is 'Future of Science and Technology and Innovation: Impact on Education Skills and Work'.

3. Indian Air Force (IAF) aerobatic display teams will participate in which country's commemorative air show?

The Indian Air Force (IAF) aerobatic display team, along with Suryakiran and Sarang, light combat aircraft Tejas, will participate in the three-day air show. This air show is a part of the 70th anniversary celebrations of the Sri Lanka Air Force (SLAF).

4. Pramod Chandra Modi is the president of which organization?

The Appointments Committee of the Cabinet has extended Pramod Chandra Modi's tenure as the Chairman of the Central Board of Direct Taxes (CBDT). Indian Revenue Service officer of 1982 batch P.C. Modi was appointed as the CBDT chairman in February 2019.

5. India has donated 'Digital Cobalt Therapy Machine' developed by BARC to which country?

India has donated an advanced 'digital cobalt therapy machine' for cancer treatment, developed for Madagascar by the Bhabha Atomic Research Center.