Which one of the following planets has the highest density?
- A.Mercury
- B.Venus
- C.Jupiter
- D.Earth
Correct answer
Explanation
The correct answer is D, Earth. With an average density of about 5.51 grams per cubic centimetre, Earth is the densest planet of the solar system.
Earth is a rocky planet with a large core of iron and nickel, and its own strong gravity squeezes the interior and raises its density further. Mercury comes a close second at about 5.43 g/cm³; it has an even larger iron core for its size, but being much smaller it is less compressed. The giant planets are made mostly of hydrogen and helium, so their densities are low, and Saturn's density of about 0.69 g/cm³ is less than that of water.
A is wrong because Mercury, at about 5.43 g/cm³, is slightly less dense than Earth. B is wrong because Venus has a density of about 5.24 g/cm³. C is wrong because Jupiter is a gas giant with a density of only about 1.33 g/cm³.
Exam tip: densest planet is Earth, least dense is Saturn, which would float in water.
Practice Questions
View allWhich one among the following states was NOT impacted by the Land Boundary Agreement Treaty between India and Bangladesh (2015)?
- A.West Bengal
- B.Assam
- C.Tripura
- D.Arunachal Pradesh
Show answer
Arunachal Pradesh does not share a border with Bangladesh, so the 2015 land boundary settlement did not touch it.
Read the full explanation →Which one of the following is found in appreciable amount in Laterite soil in India ?
- A.Calcium
- B.Phosphate
- C.Potash
- D.Nitrogen
Show answer
Indian laterite soils are poor in organic matter, nitrogen, phosphate and calcium, while iron oxide and potash are present in excess.
Read the full explanation →A large body of magmatic material that cools in the deeper depth of the Earth’s crust and develops in the form of large domes is known as
- A.Batholiths.
- B.Lacoliths.
- C.Lopoliths.
- D.Phacoliths.
Show answer
A batholith is a huge mass of magma that cools and hardens deep inside the crust, usually as granite, and takes the form of large domes.
Read the full explanation →Nisarga, Gati, Nivar, Tauktae and Yaas are names of
- A.new fighter aircrafts
- B.tourist places
- C.weather stations
- D.cyclones
Show answer
All five are tropical cyclones of the North Indian Ocean, named from the list kept by the WMO/ESCAP Panel on Tropical Cyclones.
Read the full explanation →Which one of the following is found in the innermost part of the Earth ?
- A.Conrad discontinuity
- B.Moho discontinuity
- C.Guttenberg discontinuity
- D.Lehmann discontinuity
Show answer
It separates the liquid outer core from the solid inner core at a depth of about 5,150 km, making it the deepest of the four boundaries.
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