Chapter 3 -Interior of the Earth [ UNIT II: THE EARTH]
1. The earth’s radius is ---------- km.
a) 6270
b) 6370
c) 6400
d) 6520
Answer. b) 6370
2. Which of the following is an indirect source of information about the Interior?
a) Gold mines in South Africa
b) Deep Ocean Drilling Project
c) Earthquake wave
d) Integrated Ocean Drilling Project
Answer. c) Earthquake wave
3. Which of the following is a direct source of information about the Interior?
a) Volcanic eruption
b) Meteors
c) Gravitation force and Magnetic field
d) Seismic activity
Answer. a) Volcanic eruption is a direct source of information about the interior.
4. The gravitational force of the earth is greatest near?
a) the Equator
b) Bermuda triangle
c) Poles
d) Everest Mountain
Answer. c) Poles
5. The gravitational force of the earth is least near?
a) the Equator
b) Bermuda triangle
c) Poles
d) Everest Mountain
Answer. a) the Equator
6. All natural earthquakes take place in the ------------.
a) lithosphere
b) Asthenosphere
c) Mantle
d) Outer core
Annswer. a) lithosphere
7. Which of the following are body waves?
a) P wave
b) S wave
c) Both a & b
d) Surface waves
Answer. c) Both a & b
8. Which of the following is not a fact regarding the P wave?
a) P wave is also called primary wave
b) P wave is faster wave and first to arrive at the surface.
c) P wave is similar to a sound wave and can travel through solid, liquid, and gaseous mediums.
d) P wave is an example of a surface wave
Answer. d) P wave is an example of a body wave( not surface) wave.
9. Which of the following is not a fact regarding the S wave?
a) S wave is also known as a Surface wave.
b) S waves can only travel through solid mediums.
c) S wave is slower than a P wave, that is why it is also called a secondary wave.
d) S-wave shadow zone is larger than P -the wave
Answer. a) S wave is also known as a Surface wave. S wave is a body wave, not a surface wave.
10. Which of the following wave is the last to record on a seismograph and is also the most destructive wave?
a) P wave
b) S Wave
c) Surface Wave
d) L Wave
Answer. c) Surface Wave causes the displacement of rocks and hence it causes displacement of rocks.
11. Which of the following fact is not true regarding the Propagation of Earthquake Waves?
a) P-waves vibrate parallel to the direction of the wave and other waves vibrate perpendicular to the direction of the wave.
b) Surface wave creates density differences in the material leading to stretching and squeezing of the material.
c) Surface waves are considered to be the most damaging waves.
d) S waves create troughs and crests in the material through which they pass.
Answer. b) P waves( not Surface wave) creates density differences in the material leading to stretching and squeezing of the material.
12. ------------ are generated due to sliding of rocks along a fault plane.
a) Tectonic earthquakes
b) Volcanic earthquakes
c) Collapse earthquakes
d) Explosive earthquakes
Answer. a) Tectonic earthquakes
13. Earthquakes may also occur due to the explosion of chemical or nuclear devices, this type of earthquake is called?
a) Tectonic earthquakes
b) Volcanic earthquakes
c) Collapse earthquakes
d) Explosive earthquakes
Answer. d) Explosive earthquakes
14. In the areas of intense mining activity, sometimes the roofs of underground mines collapse causing minor tremors. These are called ---------?
a) Tectonic earthquakes
b) reservoir-induced earthquakes.
c) Collapse earthquakes
d) Explosive earthquakes
Answer. c) Collapse earthquakes
15. The magnitude scale of the earthquake is known as--------.
a) Richter scale
b) Mercalli scale
c) Seismograph
d) Modi Scale
Answer. a) Richter scale ( 0 to 10).
16. The intensity scale of the earthquake is known as--------.
a) Richter scale
b) Mercalli scale
c) Seismograph
d) Modi Scale
Answer. b) Mercalli scale
17. Range of magnitude scale of the Richter scale is ------------.
a) 0 to 5
b) 0 to 10
c) 0 to 12
d) 0 to 15
Answer. b) 0 to 10
18. Range of intensity scale is ------------.
a) 0 to 5
b) 0 to 10
c) 0 to 12
d) 0 to 15
Answer. c) 0 to 12
19. -------------the outermost solid part of the earth.
a) Crust
b) Mantle
b) Outer core
c) Inner core
Answer. a) Crust
20. Mean thickness of the oceanic crust is ----------- km.
a) 5
b) 15
c) 30
d) 70
Answer. a) 5
21. Mean thickness of the continental crust is ----------- km.
a) 5
b) 15
c) 30
d) 70
Answer. c) 30
22. Thickness of continental crust is as much as -------------- km thick in the Himalayan region.
a) 5
b) 15
c) 30
d) 70
Answer. d) 70
23. The upper portion of the mantle is called -------------.
a) Lithosphere
b) asthenosphere
c) Solid mantke
d) Liquid Mantle
Answer. b) asthenosphere
24. The mantle extends from -----------’s discontinuity to a depth of 2,900 km.
a) Modi
b) Moho
c) Edwin
d) Hubble
Answer. b) Moho
25. -----------------the main source of magma in Volcanic eruptions.
a) Lithosphere
b) asthenosphere
c) Solid mantke
d) Liquid Mantle
Answer. b) asthenosphere
26. The crust and the uppermost part of the mantle are called ---------------.
a) Lithosphere
b) asthenosphere
c) Solid mantke
d) Liquid Mantle
Answer. a) Lithosphere
27. Average thickness of Lithosphere range from ---------------km.
a) 10 to 30
b) 10 to 50
c) 30 to 100
d) 10 to 200
Answer. d) 10 to 200
28. The core-mantle boundary is located at the depth of ------- km.
a) 500
b) 2900
c) 6370
d) 6500
Answer. b) 2900
29. The outer core is in the ----------- state while the inner core is in the --------- state.
a) Solid, Liquid
b) Liquid, Solid
c) Liquid, Gaseous
d) Gaseous, Liquid
Answer. b) Liquid, Solid
20. The core layer is sometimes referred to as the ----------- layer.
a) Sial
b) Sima
c) Nife
d) Magnetic
Answer. c) Nife
21. When magma reaches the surface, it is referred to as ----------.
a) Volcanic eruption
b) Lava
c) Dust
d) Volcanic debris
Answer. b) Lava
22. Which of the following volcanos is the largest of all volcanoes on the earth?
a) Shield volcanoes
b) Cinder Cone
c) Composite Volcanoes
d) Caldera
Answer. a) Shield volcanoes
23. Which of the following is not true regarding shield volcanoes?
a) Hawaiian volcano is an example of a shield volcano
b) Shield volcanoes are mostly made up of basalt
c) Shield volcanoes become explosive if somehow water gets into the vent
d) Shield volcanoes are the most explosive of the earth's volcanoes.
Answer. d) Shield volcanoes are the most explosive of the earth's volcanoes.
24. Which of the following mountain is the most explosive volcanoes on the earth?
a) Shield volcanoes
b) Cinder Cone
c) Composite Volcanoes
d) Caldera
Answer. d) Caldera
25. The volcanoes are characterized by eruptions of cooler and more viscous lavas than basalt and volcanoes' debris gets accumulated in layers. Which of the following volcanoes has the said characteristics?
a) Shield volcanoes
b) Cinder Cone
c) Composite Volcanoes
d) Caldera
Answer. c) Composite Volcanoes
26. Formation of Deccan Traps of India happens by which type of the volcanic?
a) Shield volcanoes
b) Cinder Cone
c) Composite Volcanoes
d) Flood Basalt Provinces
Answer. d) Flood Basalt Provinces
27. Igneous rocks are classified as --------- rocks when cooling happens at the surface.
a) volcanic
b) Plutonic
c) Batholiths
d) Lacoliths
Answer. a) volcanic
28. Igneous rocks are classified as --------- rocks when cooling happens in the crust.
a) volcanic
b) Plutonic
c) Batholiths
d) Lacoliths
Answer. b) Plutonic
29. The lava that cools within the crustal portions assumes different forms. These forms
are called -------------- forms.
a) volcanic
b) Plutonic
c) Extrusive
d) Intrusive
Answer. d) Intrusive
30. A large body of magmatic material that cools in the deeper depth of the crust develops in the
form of large domes. What it is called?
a) volcanic
b) Plutonic
c) Batholiths
d) Lacoliths
Answer. c) Batholiths
31. ----------are large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below.
a) volcanic
b) Plutonic
c) Batholiths
d) Lacoliths
Answer. d) Lacoliths
32. Near-horizontal bodies of the intrusive igneous rocks are called ---------.
a) Sill
b) Dykes
c) Lapolith
d) Plutonic
Answer. a) Sill
33. When the lava makes its way through cracks and solidifies almost perpendicular to the ground, such structure is called?
a) Sill
b) Dykes
c) Lapolith
d) Plutonic
Answer. b) Dykes
34. Which one of the following earthquake waves is more destructive?
a) P-waves
b) S-waves
c) Surface waves
d) None of the above
Answer. c) Surface waves
35. Which one of the following is a direct source of information about the interior of the earth?
a) Earthquake waves
b) Volcanoes
c) Gravitational force
d) Earth magnetism
Answer. b) Volcanoes
36. Which type of volcanic eruptions has caused Deccan Trap formations?
a) Shield
b) Flood
c) Composite
d) Caldera
Answer. b) Flood
37. Which one of the following describes the lithosphere:
a) upper and lower mantle
b) crust and upper mantle
c) crust and core
d) mantle and core
Answer. b) crust and upper mantle
38.
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