Current Affairs - Science

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Exercise :: Science - Latest Current Affairs

  • Science - Latest Current Affairs
1. 

ISRO has recently launched Polarimetry Doppler Weather Radar of which frequency band at Sriharikota spaceport?

A. K-band
B. C-band
C. X-band
D. S-band

Answer: Option D

Explanation:

ISRO chairman Dr. K Sivan has launched an S-band Polarimetry Doppler Weather Radar (DWR) at Satish Dhawan Space Centre in Sriharikota spaceport, Andhra Pradesh on September 16, 2018. This Radar was indigenously developed by Bharat Electronics Limited (BEL), Bangalore under Technology Transfer from ISRO. This is the 7th Radar manufactured in the country under "Make in India" Concept. The Doppler Weather Radar (DWR) is used for the observation of the weather system up to a range of 500 km and helps in early warning of severe weather events. The DWR provides detailed information on a storm's internal wind flow and structure, while conventional radars are able to track and predict cyclones. The polarimetric capability of the DWR will significantly improve the accuracy of rainfall estimation leading to accurate and timely flash flood warnings.

2. 

ISRO successfully launched PSLV C 42 with two British earth observation satellites NovaSAR and S1-4 from which space centre?

A. Satish Dhawan Space Centre (SDSC-SHAR), Sriharikota
B. ISRO Satellite Centre (ISAC), Bangalore
C. Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram
D. Indian Institute of Remote Sensing (IIRS), Dehradun

Answer: Option A

Explanation:

Indian Space Research Organisation (ISRO) successfully launched PSLV C 42 with two British earth observation satellites NovaSAR and S1-4 in precision from the Sathish Dhawan Space Centre Sriharikota, Andhra Pradesh. The satellites were put into sun-synchronous orbit just over 17 minutes after liftoff from the first launch pad. Prime Minister Narendra Modi has congratulated ISRO scientists for the successful launch of 2 UK satellites.

3. 

BARC has recently re-commissioned an upgraded version of which nuclear reactor?

A. Dhruva
B. Apsara
C. Purnima
D. Zerlina

Answer: Option B

Explanation:

The Bhabha Atomic Research Centre (BARC) has recently re-commissioned an upgraded version of nuclear research reactor 'Apsara-U' with a higher capacity, which was shut down permanently in 2009 for revamp. The indigenously made reactor 'Apsara-U' uses plate type dispersion fuel elements made of Low Enriched Uranium (LEU). By virtue of higher neutron flux, this reactor will increase indigenous production or radio-isotopes for medical application by about 50% and would also be extensively used for research in nuclear physics, material science and radiation shielding. This development has re-emphasized the capability of Indian scientists and Engineers to build, complex facilities for health care, science education and research. Apsara was the Asia's first research reactor that was made operational in Trombay campus of BARC on 4th August 1956.

4. 

The researchers from this institute have developed cheaper organic solar cells using vitamin B12 derivative, recently.

A. IISER Pune
B. IIITM Gwalior
C. IISER Bhopal
D. IISc Bangalore

Answer: Option C

Explanation:

The researchers at the Indian Institute of Science Education and Research (IISER) Bhopal have developed cheaper and more flexible organic solar cells using a synthetic derivative of vitamin B12. An organic solar cell is made up of acceptor and donor materials. The donor absorbs light from solar radiation and the harvested energy is passed to the electrodes with the help of the acceptor. In the present study, the researchers synthesized the donor using an artificial aromatic chemical (corrole) which has a similar structure to the corrin ring in vitamin B12. The artificially synthesised corrole (Cor-BODIPY) absorbs light much like porphyrin in natural chlorophyll. Currently, corroles are used as sensors, catalysts and in biomedical imaging. This is the first study wherein a corrole has been utilised for a bulk heterojunction solar cell as a donor material.

5. 

This country launched a new marine satellite HY-1C on Long March-2C rocket for surveying climate change, recently.

A. China
B. India
C. Russia
D. US

Answer: Option A

Explanation:

China successfully launched a new marine satellite called HY-1C aboard a Long March-2C rocket from the Taiyuan Satellite Launch Centre in north China's Shanxi Province. The satellite was developed by the China Spacesat Co., Ltd. under the China Academy of Space Technology. It has a design life of five years and can detect chlorophyll and suspended sediment concentrations and dissolved organic matter. It is used to Monitor ocean colour and water temperaturesfor research and it Provide survey of the resources and environment of China's offshore waters, islands and Coastal zones, marine disaster relief and the sustainable utilisation of ocean resources.