Challenge Prelims V1.0 – Day 68 – GS Paper (Science and Technology)

1. In the context of astronomy, what is the phenomenon of gravitational lensing?

2. Consider the following statements regarding cryogenic engines:

1. Cryogenic engines are highly efficient propulsion systems used in the upper stages of rockets
2. Cryogenic engine use Liquid Oxygen (LOX) and Liquid Hydrogen (LH2) as propellants.

Which of the statements given above is/are correct?

3. Which of the following statements is not correct regarding the Indian Regional Navigation Satellite System (IRNSS)?

4. Which of the following best describes “Kessler Syndrome”, often seen in the news?

5. Which of the following statements is correct about the Starlink project?

6. With reference to black holes, which of the following statements is not correct?

7. ISRO’s Project NETRA aims to

8. Consider the following statements regarding Small Satellite Launch Vehicle:

1. Small Satellite Launch Vehicle (SSLV) is a single stage Launch Vehicle.
2. SSLV is capable of launching 500kg satellite in 500km planar orbit from Satish Dhawan Space Centre.

Which of the statements given above is/are correct?

9. Consider the following statements regarding Geostationary orbit (GEO):

Statement I: Satellites in GEO appear to be stationary over a fixed position.

Statement II: Satellites in GEO circle Earth above the equator from east to west.

Which one of the following is correct in respect of the above statements?

10. Consider the following statements with reference to XPoSat mission:

1. XPoSat is the world’s first satellite-based mission dedicated to making X-ray polarimetry measurements.
2. POLIX (Polarimeter Instrument in X-rays) which is the main payload will serve as an X-ray Polarimeter.
3. It is placed in geostationary earth orbit which is approximately 36000 km above the Earth equator.

How many of the statements given above are correct?

11. In the context of cosmology, how many of the following statements is/are correct?

1. Only 10% of the matter in the universe is comprised of dark matter.
2. Black holes are formed as a result of a split in neutron stars.
3. Dark energy is evenly distributed throughout the universe in space and time.

Select the correct answer using the code given below.

12. With reference to the Hubble Space telescope, consider the following statements:

1. It is a joint venture between NASA and the European Space Agency (ESA).
2. It helped in measuring the rate of expansion of universe.

How many of the statements given above is/are correct?

13. Which of the following are the objectives of the AstroSat mission?

1. To understand high energy processes in binary star systems containing neutron stars and black holes.
2. Detect new briefly bright X-ray sources in the sky.
3. Study star birth regions and high energy processes in star systems lying beyond our galaxy.

Select the correct answer using the code given below.

14. Which of the following correctly explains ‘Quasar’?

15. Which of the following best describes the term ‘supernova’?