Earth Science MCQs (Part 13 of 21)

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  1. Following are the important milestones in organic evolution:

    1. First land plants and large coral reefs.

    2. First flowering plants.

    3. First fish appear.

    4. Dinosaurs appear.

    Which of the following gives the correct sequence of evolution?

    1. 3 1 4 2

    2. 3 4 1 2

    3. 4 1 3 2

    4. 1 3 4 2

  2. The chief source of atmospheric heat is

    1. incoming solar radiation

    2. infrared radiation from the earth.

    3. ultraviolet radiation absorbed by the ozone layer.

    4. ultraviolet radiation absorbed by clouds.

  3. In the course of organic evolution, the first appearance of organisms with hard parts occurred in the

    1. middle Proterozoic

    2. late Proterozoic

    3. Devonian

    4. Cambrian

  4. The hypothesis for the origin of life envisaged that the primitive atmosphere was

    1. having abundant nitrogen and oxygen

    2. reducing and contained essentially NH3, CH4 and H2 but not CO2 or O2.

    3. having only free oxygen and hydrogen which combined to give water to oceans.

    4. having only sulfur dioxide and water vapour.

  5. Which one of the following combination represents, Northern, Eastern, Southern & Western boundaries of the Indian Ocean respectively?

    1. South Asia, Australia, Southern Ocean, Africa

    2. Africa, Southern Ocean, Australia, South Asia

    3. South Asia, Southern Ocean, Australia, Africa

    4. South Asia, Africa, Southern Ocean, Australia

  6. The predominant factor for maintaining the dissolved oxygen level in seawater is

    1. primary production

    2. community respiration

    3. biochemical oxygen demand

    4. air-sea exchange

  7. The variance (or degree of freedom) of a chemical system (a rock) comprising muscovite (KAl3, Si3O10 (OH) 2) and quartz (SiO2) in the presence of water vapor is

    1. 0

    2. 1

    3. 2

    4. 3

  8. The kinetic energy of gases is ½ MV2; M = mass and V = speed. On heating H2O comprising of the molecules 1H2 16O and 1H2 18O, the velocity of the lighter molecule relative to that of the heavier molecules in the vapor phase should be

    1. Greater Than ½ but < 1

    2. Greater Than 0 but < ½

    3. Greater Than 1 but < 3/2

    4. Greater Than 11 but 2

  9. The mineral coesite is a high pressure polymorph of SiO2, and therefore occurs in the deeper parts of the Earth's interior. The occurrence of coesite at surface condition implies

    1. slow exhumation and impeded volume expansion

    2. rapid exhumation and unimpeded volume expansion

    3. rapid exhumation and impeded volume expansion

    4. slow exhumation and unimpeded volume expansion

  10. The mineral quartz, containing only Si and O, is the most common mineral on the continental landscape. If so, we can infer that

    1. Si is the most abundant element in the earth

    2. O is the most abundant element in the earth

    3. quartz is the most stable rock-forming mineral on the landscape

    4. quartz is the most abundant mineral in the continental rocks.

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