GK Questions NCERT Solutions (Part-34) – the figure represents the age of the earth.
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- Question 1 of 5
Question No. 1
1 pointsWhich one of the following figure represents the age of the earth?
CorrectANSWER- 4.6 billion years
Our Solar system consists of eight planets. The nebula from which our Solar system is supposed to have been formed started its collapse and core formation sometime 5-5.6 billion years ago and the planets were formed about 4.6 billion years ago. Our solar system consists of the sun (the star), 8 planets, 63 moons, millions of smaller bodies like asteroids and comets and a huge quantity of dust-grains and gases.
IncorrectANSWER- 4.6 billion years
Our Solar system consists of eight planets. The nebula from which our Solar system is supposed to have been formed started its collapse and core formation sometime 5-5.6 billion years ago and the planets were formed about 4.6 billion years ago. Our solar system consists of the sun (the star), 8 planets, 63 moons, millions of smaller bodies like asteroids and comets and a huge quantity of dust-grains and gases.
- Question 2 of 5
Question No. 2
1 pointsLife on the earth appeared around how many years before the present?
CorrectANSWER- 3.8 billion
Since life originated on earth nearly 3.8 billion years ago, there had been enormous diversification of life forms on earth. Biodiversity refers to the sum total of diversity that exists at all levels of biological organisation. Of particular importance is the diversity at genetic, species and ecosystem levels and conservation efforts are aimed at protecting diversity at all these levels. More than 1.5 million species have been recorded in the world, but there might still be nearly 6 million species on earth waiting to be discovered and named. Of the named species,> 70 per cent are animals, of which 70 per cent are insects.
IncorrectANSWER- 3.8 billion
Since life originated on earth nearly 3.8 billion years ago, there had been enormous diversification of life forms on earth. Biodiversity refers to the sum total of diversity that exists at all levels of biological organisation. Of particular importance is the diversity at genetic, species and ecosystem levels and conservation efforts are aimed at protecting diversity at all these levels. More than 1.5 million species have been recorded in the world, but there might still be nearly 6 million species on earth waiting to be discovered and named. Of the named species,> 70 per cent are animals, of which 70 per cent are insects.
- Question 3 of 5
Question No. 3
1 pointsWhich one of the following is not related to the formation or modification of the present atmosphere?
CorrectANSWER- Differentiation
With the passage of time, it cooled further and solidified and condensed into a smaller size. This later led to the development of the outer surface in the form of a crust. During the formation of the moon, due to the giant impact, the earth was further heated up. It is through the process of differentiation that the earth forming material got separated into different layers. Starting from the surface to the central parts, we have layers of the crust, mantle, outer core and inner core. From the crust to the core, the density of the material increases.
IncorrectANSWER- Differentiation
With the passage of time, it cooled further and solidified and condensed into a smaller size. This later led to the development of the outer surface in the form of a crust. During the formation of the moon, due to the giant impact, the earth was further heated up. It is through the process of differentiation that the earth forming material got separated into different layers. Starting from the surface to the central parts, we have layers of the crust, mantle, outer core and inner core. From the crust to the core, the density of the material increases.
- Question 4 of 5
Question No. 4
1 pointsWhich one of the following represents the inner planets?
CorrectANSWER-Planets between the sun and the belt of asteroids
Out of the eight planets, mercury, venus, earth and mars are called as the inner planets as they lie between the sun and the belt of asteroids the other four planets are called the outer planets. Alternatively, the first four are called Terrestrial, meaning earth-like as they are made up of rock and metals, and have relatively high densities. The rest four are called Jovian or Gas Giant planets. Jovian means Jupiter-like. Most of them are much larger than the terrestrial planets and have the thick atmosphere, mostly of helium and hydrogen. All the planets were formed in the same period sometime about 4.6 billion years ago. Till recently (August 2006), Pluto was also considered a planet.
IncorrectANSWER-Planets between the sun and the belt of asteroids
Out of the eight planets, mercury, venus, earth and mars are called as the inner planets as they lie between the sun and the belt of asteroids the other four planets are called the outer planets. Alternatively, the first four are called Terrestrial, meaning earth-like as they are made up of rock and metals, and have relatively high densities. The rest four are called Jovian or Gas Giant planets. Jovian means Jupiter-like. Most of them are much larger than the terrestrial planets and have the thick atmosphere, mostly of helium and hydrogen. All the planets were formed in the same period sometime about 4.6 billion years ago. Till recently (August 2006), Pluto was also considered a planet.
- Question 5 of 5
Question No. 5
1 pointsWhich one of the following has the longest duration?
CorrectANSWER- Eons
IncorrectANSWER- Eons
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