Sun. Dec 15th, 2024

Earth Interior

  1. Why is it not certain that there is a layer of molten rock below the Earth’s surface?

    Options:
    1. Because there is no evidence to support the existence of a magma chamber
    2. Because the pressure of the overlying materials increases the melting point of the rocks
    3. Because the inner part of the Earth may not be in a molten state despite high temperature
    4. Because the composition of the Earth's interior is not known

    Option: C

  2. Where do hot and liquid lavas come from during volcanic eruptions?

    Options:
    1. They come from the Earth's core
    2. They come from a layer of molten rock below the Earth's surface
    3. They are formed by the friction of tectonic plates
    4. They are formed by the impact of meteorites

    Option: B

  3. What happens when the pressure of the superincumbent load is released during fracturing and faulting in the crustal surface?

    Options:
    1. The rocks become solid
    2. The rocks are instantaneously melted
    3. The temperature of the Earth's interior decreases
    4. The rocks become more resistant to melting

    Option: B

  4. What is seismology?

    Options:
    1. The study of seismic waves generated during earthquakes
    2. The study of ocean currents

    Option: C

  5. What instrument is used to record seismic waves?

    Options:
    1. Seismograph
    2. Telescope
    3. Microscope
    4. Barometer

    Option: A

  6. The place of occurrence of an earthquake is called?

    Options:
    1. Seismograph
    2. Focus
    3. Epicentre
    4. Surface

    Option: B

  7. The place which experiences the seismic event first is called?

    Options:
    1. Seismograph
    2. Focus
    3. Epicentre
    4. Surface

    Option: C

  8. Where is the place of the origin of an earthquake located?

    Options:
    1. Inside the earth
    2. None of the above

    Option: B

  9. What are the three broad categories of seismic waves?

    Options:
    1. Primary waves
    2. Light waves
    3. Ocean waves
    4. Longitudinal waves

    Option: A

  10. Which seismic wave travels with the fastest speed through solid materials?

    Options:
    1. Primary waves
    2. Secondary waves
    3. Surface waves
    4. All travel at the same speed

    Option: A

  11. Can secondary waves pass through liquid materials?

    Options:
    1. Yes
    2. No
    3. Only in certain circumstances
    4. It depends on the speed of the wave

    Option: B

  12. Which seismic wave affects only the surface of the earth and dies out at smaller depth?

    Options:
    1. Primary waves
    2. Secondary waves
    3. Surface waves
    4. Both primary and secondary waves

    Option: C

  13. What are preliminary tremors?

    Options:
    1. Small and weak swings recorded at the epicentre after an earthquake occurs
    2. Large and strong waves recorded at the epicentre after an earthquake occurs
    3. Waves that are refracted while passing through a body having heterogeneous composition
    4. None of the above

    Option: A

  14. How are seismic waves refracted at places of density changes?

    Options:
    1. They follow a straight path
    2. They adopt curved and refracted paths

    Option: B

  15. Options:

    Option: B

  16. What is the reason that S waves cannot pass through liquid?

    Options:
    1. Because they have a low frequency
    2. Because they have a high frequency
    3. Because they are polarized waves
    4. Because they require a solid medium to propagate

    Option: D

  17. At what angular distance from the epicenter do S waves disappear?

    Options:

    Option: B

  18. What did Oldhum demonstrate in 1909 regarding seismic waves?

    Options:
    1. The existence of P waves in the core of the earth
    2. The existence of S waves in the core of the earth

    Option: C

  19. Which set of seismic waves is absent in the core of the earth?

    Options:
    1. P waves
    2. S waves
    3. Both A and B
    4. None of the above

    Option: B

  20. 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: D