SSC CGL Science – Scientific Discoveries, Inventions & Space Technology – Tier II Level · Marathon

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SSC CGL Science – Scientific Discoveries, Inventions & Space Technology – Tier II Level · Marathon – 14 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
The orbital speed needed for a satellite to circle just above the Earth's surface is about:

Correct Answer: A [7.9 km/s]

Explanation:

11.2 km/s is the escape velocity.

2.  
Fill in the blankA geostationary satellite is at a height of about ______ above the equator.

Correct Answer: D [35,786 km]

Explanation:

≈ 36,000 km; 1.5 million km is L1.

3.  
Aditya-L1 was inserted into its halo orbit around L1 on (as per isro.gov.in):

Correct Answer: C [6 January 2024]

Explanation:

Launch 2 Sept 2023; halo orbit 6 Jan 2024.

4.  
Fill in the blankXPoSat is described by ISRO as India's first dedicated ______ mission.

Correct Answer: C [polarimetry]

Explanation:

To study bright astronomical X-ray sources.

5.  
Superconductivity was discovered by:

Correct Answer: A [Heike Kamerlingh Onnes]

Explanation:

Zero resistance at very low temperature.

6.  
Which property is NOT true of laser light?

Correct Answer: D [It is a mixture of many colours]

Explanation:

Laser light is of one colour (monochromatic).

7.  
The Saha ionisation equation, used in astrophysics, was given by:

Correct Answer: B [Meghnad Saha]

Explanation:

Answer: Meghnad Saha. Saha equation.

8.  
According to the isro.gov.in page, Chandrayaan-2's Vikram lander landing was attempted on:

Correct Answer: B [7 September 2019]

Explanation:

Launch 22 July; LOI 20 Aug; separation 2 Sept; landing attempt 7 Sept.

9.  
The Thumba Equatorial Rocket Launching Station (TERLS) has been dedicated to:

Correct Answer: C [the United Nations (since 1968)]

Explanation:

isro.gov.in: dedicated to the UN since 1968.

10.  
In the Axiom-4 mission (2025), ISRO Gaganyatri Shubhanshu Shukla travelled to:

Correct Answer: D [the International Space Station]

Explanation:

Launched 25 June 2025 on SpaceX Dragon; splashdown 15 July 2025.

11.  
A rocket can work in space, where there is no air, because:

Correct Answer: A [it carries its own oxidiser and is pushed by the reaction of its exhaust gases]

Explanation:

Newton's third law; fuel + oxidiser on board.

12.  
Optical fibres carry light signals over long distances mainly by:

Correct Answer: B [total internal reflection]

Explanation:

Light keeps reflecting inside the core.

13.  
Which medical imaging method uses a strong magnetic field and radio waves instead of X-rays?

Correct Answer: A [MRI]

Explanation:

MRI – magnet + radio waves; CT – many X-ray images.

14.  
Apollo 11, which carried the first humans to land on the Moon, was launched on (as per nasa.gov):

Correct Answer: D [16 July 1969]

Explanation:

Launch 16 July; landing 20 July 1969.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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