Wed. Jun 26th, 2024

Earth Interior

  1. How many zones of varying properties have been identified in the earth’s interior?

    Options:
    1. One
    2. Two
    3. Three
    4. Four

    Option: C

  2. Which are the three zones identified in the earth’s interior?

    Options:
    1. Core
    2. Crust
    3. Outer core
    4. Lithosphere

    Option: A

  3. What is the main difference between the upper and lower crust?

    Options:
    1. Thickness
    2. Composition
    3. Temperature
    4. Velocity of P waves

    Option: D

  4. What is the average velocity of P waves in the upper crust?

    Options:
    1. 6.1 km per second
    2. 6.9 km per second
    3. 30 km
    4. 100 km

    Option: A

  5. What is the average velocity of P waves in the lower crust?

    Options:
    1. 6.1 km per second
    2. 6.9 km per second
    3. 30 km
    4. 100 km

    Option: B

  6. What is the thickness of the crust according to various sources?

    Options:
    1. 6.1 km
    2. 6.9 km
    3. Between 30 km and 100 km
    4. More than 100 km

    Option: C

  7. What is the relationship between seismic wave velocities and the different zones of the earth?

    Options:
    1. There is no relationship
    2. Seismic wave velocities are the same in all zones
    3. Seismic wave velocities increase with depth
    4. Seismic wave velocities vary in different zones

    Option: D

  8. What are the two types of crust based on seismic wave velocities?

    Options:
    1. Oceanic and continental
    2. Upper and lower
    3. Igneous and sedimentary
    4. Silica-rich and iron-rich

    Option: B

  9. What has enabled scientists to unravel the mystery of the earth’s interior?

    Options:
    1. Analysis of volcanic rocks
    2. Study of ocean currents
    3. Analysis of seismic waves
    4. Observation of meteorites

    Option: C

  10. What is the average density of the outer crust?

    Options:
    1. 2.8
    2. 3
    3. 2.9
    4. 3.1

    Option: A

  11. What is the average density of the lower crust?

    Options:
    1. 2.8
    2. 3
    3. 2.9
    4. 3.1

    Option: B

  12. What has seismology revealed about the structure and composition of upper and lower crust?

    Options:
    1. They are almost identical
    2. They are vastly different
    3. They are similar in some aspects
    4. There is no evidence of their structure and composition

    Option: A

  13. What is the reason for the difference in density between the upper and lower crust?

    Options:
    1. Different composition
    2. Different structure
    3. Pressure of the load above
    4. None of the above

    Option: C

  14. What is the Mohorovicic discontinuity?

    Options:
    1. The point where the density of the mantle decreases suddenly
    2. The point where the mantle ends and the crust begins
    3. The point where the velocity of seismic waves suddenly increases at the base of the lower crust
    4. The point where the velocity of seismic waves decreases in the uppermost zone of the upper mantle

    Option: C

  15. Who discovered the Mohorovicic discontinuity and in which year?

    Options:
    1. A. Mohorovicic
    2. A. Einstein
    3. I. Newton
    4. G. Galileo

    Option: A

  16. What is the density of the mantle?

    Options:
    1. 6.9 g cm-3
    2. 7.9 g cm-3
    3. 4.6 g cm-3
    4. 8.1 g cm-3

    Option: C

  17. What percentage of the total volume of the earth does the mantle contain?

    Options:
    1. 83%
    2. 68%
    3. 50%
    4. 25%

    Option: A

  18. How is the mantle divided based on the information received from the discovery of the International Union of Geodesy and Geophysics?

    Options:
    1. Into two sub-zones
    2. Into three sub-zones
    3. Into four sub-zones
    4. Into five sub-zones

    Option: B

  19. What is the zone of low velocity?

    Options:
    1. The zone where the velocity of seismic waves suddenly increases at the base of the lower crust
    2. The zone where the velocity of seismic waves relatively slows down in the uppermost zone of the upper mantle
    3. The zone where the density of the mantle decreases suddenly
    4. The zone where the mantle ends and the crust begins

    Option: B

  20. What are the main components of the mantle?

    Options:
    1. Silicate minerals rich in iron and magnesium
    2. Carbon and oxygen
    3. Gold and silver
    4. Hydrogen and helium

    Option: A