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The Universe

📆 October 21, 2024

Total Questions: 51

11. "Light Year" is the unit of- [M.P.P.C.S.(PRE) 1994]

Correct Answer: (b) Distance
Solution:Light year is the distance which light can travel in a vaccum in one year. In different units of distance. one light year is equipment to as follows-Metre 9.461 × 1015

Kilometer 9.461 × 103

Millimeter 9.461 × 1018

Celestial unit 63.24 × 103

Miles 5.878 × 1012

12. The unit of measuring distance between the stars is known as [Uttarakhand P.C.S. (Pre) 2006]

Correct Answer: (d) Light year
Solution:Light year is most often used in measuring the distance between the stars. The distance covered by light in one year in a vacuum with a speed of 3x 10 km./sec is known as 'Light Year'.

Light-years are used to measure astronomical distances because they make it easier to manage the vast distances in space. Although the term includes the word "year", a light-year is a unit of distance, not time.

13. If the stars are seen to rise perpendicular to the horizon by an observer, he is located on the - [I.A.S. (Pre) 2001]

Correct Answer: (a) Equator
Solution:Stars move parallel to celestial equator around North and South celestial poles. Celestial North and South poles are straight overhead to Geographical North and South Poles and celestial Equator is almost at overhead to the geographical Equator and at 90° to Poles. It creates occlusion from the point of East and West at the horizon. The degrees of celestial poles are equal in number to latitude of the Equator for the horizon. If an observer sees the stars perpendicular to the horizon he is located at the equator.

14. A person stood alone in a desert on a dark night and wanted to reach his village which was situated 5 km East of the point where he was standing. He had no instrument to find the direction but he located the pole star. The most convenient way now to reach his village is to walk in the [I.A.S. (Pre) 2012]

Correct Answer: (c) Direction keeping the pole star to his left
Solution:Pole star shines in the North direction. Hence, in order to move towards the east, Pole star should always be on the left side. The North Star is also known as Pole Star. It is a very bright star around 2,500 times more luminous than the Sun. It is part of the constellation Ursa Minor and is around 323 light years away from the Earth. The Northstar is less than 1° away from the north celestial pole, almost in direct line with the Earth's rotational axis. It appears to sit motionless in the northern sky, with all the other stars appearing to rotate around it. Its position and brightness have allowed humans to use it for navigation since late antiquity. The elevation of the star above the horizon gives the approximate latitude of the observer. Upon crossing the equator to the south, however, the North Star is lost over the horizon and hence stops being a useful navigational aid.

15. The group of stars that indicates the direction of pole. [41" B.P.S.C. (Pre) 1996]

Correct Answer: (a) Saptarishi
Solution:Saptarishi is a group of stars that indicate the direction of the pole. Hence, option (a) is the correct answer.

The Saptarishi is a constellation of seven stars. In ancient times, the Saptarishi were very important in the night sky. Because of it, sailors identified the directions at night. The two stars of this constellation help them find out the north direction because they always point at the Pole Star shining over the North Pole.

16. Which one of the following is not related to space terminology? [U.P.P.C.S. (Pre) 1997]

Correct Answer: (d) Byte
Solution:

A byte is a group of eight binary digits or bits operated on as a unit in computer terminology. Rest of all are related to space terminology.

17. The terms 'Event Horizon', 'Singularity', 'String Theory' and 'Standard Model' are sometimes seen in the news in the context of [I.A.S. (Pre) 2017]

Correct Answer: (a) Observation and understanding of the Universe
Solution:Event Horizon It is a boundary which defines the area surrounding black hole in space. Beyond this boundary events cannot affect an outside observer.

Singularity - It is a place in the space-time where the gravitational area of the celestial bodies becomes infinite.

String Theory - String theory states that all matter in the universe is composed of tiny one-dimensional strings, not point particles.

Standard model - The standard model of particle physics is the theory describing three of the four known fundamental forces (the electromagnetic, weak and strong) in the universe as well as classifying all known elementary particles.

18. Which one of the following is not a natural unit of time? [Uttarakhand P.C.S. (Pre) 2016]

Correct Answer: (c) Standard time
Solution:tandard time is the official standard time of a region or country. It is used within a region or country for legal, commercial, and social purposes, often based on a meridian passing through the region. The concept of standard time emerged in the 19th century to address the confusion caused by different local times, particularly with the advent of railways. Geographical regions are organized into time zones, each with a standard time offset from Coordinated Universal Time (UTC). India uses Indian Standard Time (IST), which is UTC+05:30. Some regions observe DST, which is an adjustment of standard time.

19. The "Big Bang Theory" is related to - [R.A.S./R.T.S.(Pre) 2007]

Correct Answer: (b) Origin of the Universe
Solution:The "Big Bang Theory" is related to the origin of the Universe, Milky Way and Solar System. This theory was propounded by George Lemaitre (1894-1966). Later in 1967, Robert Wagner explained this theory. According to this theory, the whole universe was concentrated in a hot and dense point some 13.7 or 13.8 billion years ago. Due to high concentration, there was a sudden explosion which was termed as Big-Bang.

20. The "Big-Bang Theory" explains the origin of- [U.P.P.C.S. (Pre) 2016]

Correct Answer: (c) Universe
Solution:

The "Big Bang Theory" explains the origin of the universe from the earliest known period through its subsequent large scale evolution. The measurement of the expansion rate of the universe places this moment approximately 13.7 or 13.8 billion years ago, which is thus considered the age of the universe.

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