Sun. Dec 15th, 2024

Earth Interior

  1. Which set of seismic waves has the maximum velocity?

    Options:
    1. P-S waves
    2. Pg-Sg waves
    3. P*-S* waves
    4. None of the above

    Option: A

  2. What is the nature of the rocks in the upper layer of the earth?

    Options:
    1. Granitic
    2. Basaltic
    3. Amphibolite
    4. Glassy basalt

    Option: A

  3. What is the average velocity of S waves in the middle zone of the earth?

    Options:
    1. 3.3 km/s
    2. 4.5 km/s
    3. 5.4 km/s
    4. 6-7 km/s

    Option: A

  4. What is the estimated depth of the Core of the earth?

    Options:
    1. Less than 2900 km
    2. Between 2900 and 5000 km
    3. Between 5000 and 7000 km
    4. More than 7000 km

    Option: B

  5. Options:
    1. The interior is composed of sedimentary rocks
    2. The interior is composed of felspar and mica
    3. The interior is composed of heavy metals

    Option: C

  6. What is the average density of the Sial layer?

    Options:
    1. 2.9
    2. 4.7
    3. 11
    4. 8

    Option: A

  7. Which layer is the source of magma and lava during volcanic eruptions?

    Options:
    1. Sial
    2. Sima
    3. Nife
    4. None of the above

    Option: B

  8. What is the dominant constituent of the Sima layer?

    Options:
    1. Potassium
    2. Calcium
    3. Magnesium
    4. Iron

    Option: C

  9. What does the presence of iron in the Nife layer indicate?

    Options:
    1. The rigidity of the earth
    2. The source of magma and lava during volcanic eruptions
    3. The formation of continents

    Option: A

  10. According to Daly, what is the average density of the outer layer of the earth and what is its thickness?

    Options:
    1. Average density is 4.5 to 9 and thickness is 1
    2. Average density is 3.0 and thickness is 1
    3. Average density is 11.6 and thickness is 7
    4. None of the above

    Option: B

  11. According to Harold Jeffreys, how many layers has he identified in the earth and on what basis?

    Options:
    1. Three layers on the basis of seismic waves
    2. Four layers on the basis of thermal conditions
    3. Two layers on the basis of longitudinal waves
    4. Four layers on the basis of seismic waves

    Option: D

  12. According to Arthur Holmes, what are the two major layers in the earth?

    Options:
    1. Two layers- crust and mantle
    2. Two layers- crust and substratum
    3. Three layers- crust
    4. None of the above

    Option: B

  13. According to Van der Gracht, what is the thickness and density of the outer sialic crust under the Atlantic Ocean?

    Options:
    1. Thickness is 60 km and density is 2.75 to 2.9
    2. Thickness is 20 km and density is 2.75 to 2.9
    3. Thickness is absent and density is 2.75 to 2.9
    4. Thickness is 60 km and density is 3.1 to 4.75

    Option: B

  14. What is the generalized pattern of the layering system of the earth’s interior that is commonly accepted by a majority of scientists?

    Options:
    1. Lithosphere
    2. Atmosphere
    3. Biosphere
    4. None of the above

    Option: A

  15. What is the dominant rock in the Pyrosphere?

    Options:
    1. Granite
    2. Basalt
    3. Iron
    4. Nickel

    Option: B

  16. What is the average density of the Pyrosphere?

    Options:
    1. 3.5
    2. 5.6
    3. 8-11
    4. It is not mentioned in the paragraph

    Option: B

  17. The Barysphere is composed of

    Options:
    1. Granite
    2. Basalt
    3. Iron and nickel
    4. Silica and aluminium

    Option: C

  18. What is the thickness of the Barysphere?

    Options:
    1. 100 km
    2. 2780 km
    3. 2800 km
    4. It stretches from 2800 km upto the nucleus of the core.

    Option: D

  19. What is the average density of the Barysphere?

    Options:
    1. 3.5
    2. 5.6
    3. 8-11
    4. 10

    Option: C

  20. What is the main source of information about the composition and structure 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