General Science PYQ – Astronomy and Space Science – Part 1 (Q 1–26)

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General Science PYQ – Astronomy and Space Science – Part 1 (Q 1–26) – 24 questions, subject: 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.  
Fisheries Inspector / SI 2023
Group of stars is called

Correct Answer: B [Constellation]

Explanation:

A group of stars forming a recognisable pattern in the sky is called a constellation; the IAU recognises 88 of them.

2.  
GSCE 2021
Assertion (A): A galaxy is a system of billions of stars, stellar remnants, interstellar gas, dust and dark matter.
Reason (R): The Milky Way is the galaxy that contains our solar system.

Correct Answer: D [Both (A) and (R) are true but (R) is not the correct explanation of (A).]

Explanation:

Both statements are true, but the Milky Way containing our solar system does not explain the definition of a galaxy, so R is not the correct explanation of A.

3.  
Asst. Director (Fisheries) 2022
Which star is nearest to the earth next to the sun?

Correct Answer: B [Alpha Centauri]

Explanation:

After the Sun, the nearest star system to Earth is Alpha Centauri, about 4.3 light years away, whose member Proxima Centauri is the closest single star.

4.  
CTS (ITI Posts) 2025
The element hydrogen is most abundantly found in ______.

Correct Answer: C [Universe]

Explanation:

Hydrogen is the most abundant element in the universe, followed by helium.

5.  
Geology Service 2023
Which gas is maximum available in the Sun?

Correct Answer: A [Hydrogen]

Explanation:

Hydrogen makes up about three-fourths of the Sun's mass, followed by helium.

6.  
Combined Research Assistant 2023
Sun is now in which of the following stages?

Correct Answer: A [Main sequence star]

Explanation:

The Sun is a medium-sized main sequence star that fuses hydrogen into helium in its core.

7.  
Health Officer 2023
Rapid collapsing of massive stars generates very high heat and then a violent explosion; this is called

Correct Answer: D [Supernova explosion]

Explanation:

When a massive star runs out of fuel, its core collapses rapidly, producing intense heat and a violent explosion called a supernova.

8.  
Library Service 2023
Supernova is a massive explosion of

Correct Answer: B [A dying star]

Explanation:

A supernova is the huge explosion of a massive star at the end of its life.

9.  
Health Officer 2023
Which telescope captured a magnetic field image around a black hole in M87 galaxy?

Correct Answer: B [Event Horizon Telescope]

Explanation:

The Event Horizon Telescope, a global network of radio telescopes, imaged the magnetic field around the black hole in galaxy M87.

10.  
Research Asst. (Animal Husbandry) 2023
Hubble's law is based on

Correct Answer: D [Doppler effect]

Explanation:

Hubble's law, that galaxies recede at speeds proportional to their distance, was derived from the redshift of their light, which is a Doppler effect.

11.  
Combined Engineering Subordinate Service 2023
Who proposed the geocentric model of the universe?

Correct Answer: C [Ptolemy]

Explanation:

The geocentric model, with Earth at the centre of the universe, was proposed by Ptolemy in the 2nd century AD.

12.  
Group 3A 2023
Natural satellite of Earth is

Correct Answer: B [Moon]

Explanation:

The Moon is Earth's only natural satellite, whereas Sputnik was an artificial satellite and Andromeda and Milky Way are galaxies.

13.  
GSASO 2020
Find out the incorrect statement

Correct Answer: C [Jupiter and Saturn have 55 and 31 satellite respectively]

Explanation:

The numbers of satellites of Jupiter and Saturn are now far more than 55 and 31 owing to new discoveries, so statement C is incorrect.

14.  
Group 4 2024
Match the following:
(a) Ganymede – 1. Moves in opposite direction to the direction of the spin of its planet
(b) Titan – 2. Greenish star-like appearance
(c) Neptune – 3. Moon with clouds in our solar system
(d) Triton – 4. Largest moon of our solar system

Correct Answer: A [4 3 2 1]

Explanation:

Ganymede is the largest moon of the solar system, Titan has a thick atmosphere, and Neptune looks greenish blue, matching the given sequence 4 3 2 1.

15.  
Asst. Training Officer (Textile) 2023
'Ceres' is a/an

Correct Answer: D [asteroid]

Explanation:

Ceres, the largest object in the asteroid belt between Mars and Jupiter, was classified as an asteroid when discovered in 1801.

16.  
District Educational Officer 2023
The first satellite (spacecraft) to enter into the Sun's atmosphere is

Correct Answer: C [Parker Solar Probe]

Explanation:

NASA's Parker Solar Probe, launched in 2018, entered the Sun's corona in 2021, becoming the first spacecraft to touch the Sun's atmosphere.

17.  
AD Social Welfare 2022
Kepler's law of areas is a statement of the law of conservation of

Correct Answer: B [Angular momentum]

Explanation:

Kepler's law of areas follows from the conservation of angular momentum of a planet moving about the Sun.

18.  
Asst. Conservator of Forests 2023
Kepler's second law of planetary motion is also known as

Correct Answer: C [law of equal area]

Explanation:

Kepler's second law, that the line joining Sun and planet sweeps equal areas in equal times, is called the law of equal areas.

19.  
GSCE 2021
If the Distance between earth and the sun were to be doubled, the number of days in a year would be

Correct Answer: B [1032]

Explanation:

By Kepler's third law T is proportional to r^(3/2), so doubling the distance gives T = 2^1.5 x 365 = about 1032 days.

20.  
CTS (Interview Posts) 2024
Which of the following is not correct?

Correct Answer: D [The geostationary orbit is elliptical]

Explanation:

A geostationary orbit is circular, equatorial, about 35,786 km high with a 24-hour period, so saying it is elliptical is incorrect.

21.  
Group 1/1A 2025
Kessler syndrome refers to

Correct Answer: C [Accumulation of satellite fragments, spent rocket stages and other discarded materials in space]

Explanation:

Kessler syndrome is the cascading build-up of satellite fragments, spent rocket stages and other debris in orbit through repeated collisions.

22.  
Asst. Professor (Psychology) 2023
Which one is the pioneer satellite of India?

Correct Answer: B [Aryabhata]

Explanation:

Aryabhata, launched on 19 April 1975, was India's first satellite.

23.  
Combined Engineering Subordinate Service 2023
Which is the first communication satellite in INSAT series?

Correct Answer: B [INSAT-1B]

Explanation:

INSAT-1A failed within months, so INSAT-1B (1983) was the first successfully working communication satellite of the INSAT series.

24.  
Combined Engineering Subordinate Service 2023
ISRO executed this mission in October 2022. The vehicle launched in the mission was

Correct Answer: C [LVM-3]

Explanation:

In October 2022 ISRO launched 36 OneWeb satellites on the LVM3-M2 rocket, its first commercial LVM3 launch.

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