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Earth although has an average density of 5.5 g/cm cube, its core has a density of more than 11 g/cm cube.
What are the possible reasons?
1) Core is formed of materials like iron, nickel etc which has higher density.
2) Incumbent pressure from the overlaying rocks.
3) High temperature prevalent in the core region [more than 5000 degree Celsius].
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There are different discontinuities within the Earth’s internal structure. Which are the discontinuities that have been incorrectly matched with its/their respective locations?
1) Mohorvic discontinuity -- boundary between Core and Mantle.
2) Wiechert-Gutenberg discontinuity -- boundary between Crust and Mantle.
3) Conrad discontinuity – located at a depth of 15-20kms from the Earth’s surface.
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Consider the statements regarding Earth’s interior and seismic waves.
1) Primary waves totally disappear in the core region revealing that outer core is made up of liquid.
2) Secondary waves show changes in its speed as it travels from magma chamber to lithosphere region indicating difference in density.
3) The speed of secondary waves is highest inside the Earth’s Core region indicating highest density in the Core region.
Choose the correct statement/s from the code below.
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Winter solstice for Northern Hemisphere generally is on 22nd or 21st December every year.
Consider the statements regarding winter solstice in Northern Hemisphere.
1) The circle of illumination excludes the North Pole region from Sunlight.
2) From 66.5 degree South to 90 degree South, the Sun remains below the horizon the entire day.
3) Arctic Circle is the Southernmost parallel in the Northern Hemisphere that experiences a 24 hour period of darkness on this day.
Choose the correct statements from the codes below.
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Atacama desert is one of the driest deserts of the world. Apart from other reasons there is a particular current which has made it a driest desert. Which is that current?
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Plasma is one of the four fundamental states of matter. Consider the following statements.
1) It doesn’t have volume but has shape.
2) It is the most abundant form of matter.
3) Gas or air can be turned into plasma when artificially ionized.
Choose the correct statements from the codes below.
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Sun spots are the one found on the outer surface of the Sun.
Consider the statements regarding Sun spots.
1) Sun spots region generally have lower temperature than the surrounding region on the Sun’s outer surface.
2) Sun spots do not have any effect on Earth’s climate.
3) Each period of weak Sun spot activity co-relates with the period of overall high solar radiation output from the Sun’s surface.
4) Sun spots generally have 11 year cycle.
Choose the correct statement/s from the following codes.
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Developing countries like India has an adverse sex ratio of less than 1000 while in developed countries it is more than 1000. [Sex ratio: It is the number of females in a country for every 1000 males]
What is/are the possible reason/s with reference to India?
1) Social disadvantages that female face like female foeticide, female infanticide, domestic violence etc.
2) Stopping at one child ie couples restrain themselves from going for second child provided the first child born is male.
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Consider the following statements which describe the properties of a particular metal
1. It as a valuable metal of which the major ore is Wolfram.
2. It is self hardening which it imparts to the steel when alloyed with the steel.
3. Steel when alloyed with this metal, is used in manufacturing of ammunitions, armour plates, heavy guns etc.
4. Its alloys are heat resistant, corrosion resistant and hardfacing.
Choose the correct metal from the options
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Continental Drift theory by Wegener changed the perceptions about the Earth’s crust.
Consider the statements regarding this theory.
1) Sialic masses used to float over the Sima without any resistance being offered by Sima.
2) Earlier all land masses were united to form a massive landmass known as ‘Panthalasa’.
3) Ocean floors were considered to be stable and never moved.
Choose the correct statement/s from the following.
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