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The Universe Part-2

📆 October 21, 2024

Total Questions: 50

1. The solar eclipse occurs on - [U.P.P.C.S. (Pre) 1991]

Correct Answer: (b) New Moon day
Solution:A solar eclipse occurs when the Moon comes between Earth and the Sun, and the Moon casts a shadow over the Earth. A solar eclipse can only take place at the phase of New Moon (Amavasya), when it passes directly between the Sun and the Earth and its shadow falls upon the Earth surface.

2. Every solar eclipse occurs on - [U.P. U.D.A./L.D.A. (Pre) 2006, R.A.S./R.T.S. (Pre) 2000, R.A.S/R.T.S. (Pre) 1999]

Correct Answer: (a) Poornima only
Solution:A solar eclipse occurs when the Moon comes between Earth and the Sun, and the Moon casts a shadow over the Earth. A solar eclipse can only take place at the phase of New Moon (Amavasya), when it passes directly between the Sun and the Earth and its shadow falls upon the Earth surface.

3. When does solar eclipse occur? [47th B.P.S.C (Pre) 2005, M.P.P.C.S. (Pre) 1993, U.P.P.C.S. (Pre) 1990]

Correct Answer: (c) When the moon comes between the earth and the sun
Solution:A solar eclipse occurs when the Moon comes between Earth and the Sun, and the Moon casts a shadow over the Earth. A solar eclipse can only take place at the phase of New Moon (Amavasya), when it passes directly between the Sun and the Earth and its shadow falls upon the Earth surface.

4. The Solar Eclipse achieves totality only in limited geographical regions because - [I.A.S. (Pre) 1993]

Correct Answer: (a) The size of the shadow of the Moon on the Earth is small as compared to the cross section of the Earth.
Solution:A solar eclipse occurs when the moon comes between the earth and Sun. In this situation, the part of the earth which is towards the Sun receives the shadow of the Moon and also 91 the Moon's shadow falling on the Earth is smaller than the cross-section of the Earth. This is the reason that the total or full Solar eclipse is not visible on every part of the Earth together, but visible only to a limited portion of the Earth.

5. Sun's halo is produced by the refraction of light in - [I.A.S. (Pre) 2002]

Correct Answer: (c) Ice crystals in Cirrus clouds
Solution:The Sun's halo is a circle which appears around the sun. Whenever Sun rays pass through the ice crystal present at the upper level of cirrus clouds, sun's halo becomes visible due to the refraction of rays.

6. One Astronomical unit is average distance - [Jharkhand P.C.S. (Pre) 2011, I.A.S. (Pre) 1998]

Correct Answer: (a) Between Earth and Sun
Solution:An astronomical unit is the mean distance between the Earth and the Sun. 1AU = 149.598 × 10⁶ km (150 × 10km) or 149.6 Million km In other various units its value is as follows.

In Metre - 1AU = 149.59 × 10⁹

In millimeter - AU = 149.59 × 10¹²

7. The average or mean distance between the earth and the sun is- [I.A.S. (Pre) 1997]

Correct Answer: (d) 150 × 10⁶ km
Solution:An astronomical unit is the mean distance between the Earth and the Sun. 1AU = 149.598 × 10⁶ km (150 × 10km) or 149.6 Million km In other various units its value is as follows.

In Metre - 1AU = 149.59 × 10⁹

In millimeter - AU = 149.59 × 10¹²

8. The distance between the earth and the sun is - [U.P.P.C.S. (Pre) 2010]

Correct Answer: (d) 149.6 Million km
Solution:An astronomical unit is the mean distance between the Earth and the Sun. 1AU = 149.598 × 10⁶ km (150 × 10km) or 149.6 Million km In other various units its value is as follows.

In Metre - 1AU = 149.59 × 10⁹

In millimeter - AU = 149.59 × 10¹²

9. The earth is nearest to the sun on- [U.P.P.S.C. (GIC) 2010, Uttarakhand P.C.S. (Mains) 2006]

Correct Answer: (a) 3rd January
Solution:The distance between the sun and the earth is minimum in the first week of January, this situation or position is called 'Perihelion'. Generally Perihelion occours on 4th January. While opposite to it is on 4th July, the sun stands farthest from the earth and this position or situation is known as "Aphelion".

10. Size of the Sun is how many times bigger than that of the earth? [M.P.P.C.S. (Pre) 2014]

Correct Answer: (c) 109 times
Solution:According to NASA, the diameter of the sun is 109.2 times the diameter of the earth. The mean radius of the sun is 695700 km while the mean radius of the earth is 6371 km.
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