SSC CGL Geography – Universe & the Solar System – Tier II Level · Marathon

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SSC CGL Geography – Universe & the Solar System – Tier II Level · Marathon – 10 questions, subject: Geography – India & World. 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.  
Saturn is about 9.5 AU from the Sun. Using the 8-Minute Ruler, sunlight reaches Saturn in about:

Correct Answer: C [1 h 19 min]

Explanation:

9.5 × 8⅓ ≈ 79 min = 1 h 19 min.

2.  
By Kepler's third law (T² = a³, T in years, a in AU), a body at 4 AU from the Sun takes about how long for one orbit?

Correct Answer: A [8 years]

Explanation:

T = √(4³) = √64 = 8 years.

3.  
A star is 10 light-years away. Its distance is about:

Correct Answer: A [9.46 × 10¹³ km]

Explanation:

10 × 9.46 × 10¹² = 9.46 × 10¹³ km.

4.  
A traveller at 15°N looks at the Pole Star. It appears about how high above the northern horizon?

Correct Answer: C [15°]

Explanation:

Pole Star altitude ≈ observer's latitude.

5.  
The mean Earth–Moon distance is 3,84,400 km. Light from the Moon reaches us in about:

Correct Answer: B [1.3 s]

Explanation:

3,84,400 ÷ 2,99,792 ≈ 1.28 s.

6.  
Two-quantity comparison
Quantity I: number of planets that spin east → west
Quantity II: number of planets with no natural moon

Correct Answer: C [Quantity I = Quantity II]

Explanation:

Venus and Uranus spin east → west (2); Mercury and Venus have no moon (2).

7.  
Statement-basedConsider:
I. A star whose core mass is below the Chandrasekhar limit ends as a white dwarf.
II. The Sun will end its life as a black hole.
Which is/are correct?

Correct Answer: D [Only I]

Explanation:

The Sun is below ≈ 1.4 solar masses → white dwarf, not a black hole.

8.  
Chronological orderChronological order (earliest first):

Correct Answer: D [Uranus discovered, Neptune discovered, Pluto discovered, Pluto reclassified]

Explanation:

1781 Uranus → 1846 Neptune → 1930 Pluto → 2006 reclassified.

9.  
The difference between the synodic month and the sidereal month is about:

Correct Answer: A [2.2 days]

Explanation:

29.5 − 27.3 = 2.2 days (the Earth moves along its orbit meanwhile).

10.  
Trick Spotterfastest correct way to estimate the light-time from the Sun to Neptune (≈ 30 AU)?

Correct Answer: B [30 × 8⅓ min ≈ 250 min ≈ 4 h 10 min]

Explanation:

8-Minute Ruler; the light-year route uses the wrong unit and 30 ÷ 8⅓ inverts the rule.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 Geography – India & World book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-geography-india-world

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